From 4f2001aab7fcdf62e7576a879fac9eeb96c8279d Mon Sep 17 00:00:00 2001
From: Boxy <supbscripter@gmail.com>
Date: Mon, 20 Feb 2023 23:43:25 +0000
Subject: remove flag

---
 compiler/rustc_interface/src/tests.rs | 1 -
 1 file changed, 1 deletion(-)

(limited to 'compiler/rustc_interface/src')

diff --git a/compiler/rustc_interface/src/tests.rs b/compiler/rustc_interface/src/tests.rs
index ac32988d3ac..bfb1e822a26 100644
--- a/compiler/rustc_interface/src/tests.rs
+++ b/compiler/rustc_interface/src/tests.rs
@@ -776,7 +776,6 @@ fn test_unstable_options_tracking_hash() {
     tracked!(packed_bundled_libs, true);
     tracked!(panic_abort_tests, true);
     tracked!(panic_in_drop, PanicStrategy::Abort);
-    tracked!(pick_stable_methods_before_any_unstable, false);
     tracked!(plt, Some(true));
     tracked!(polonius, true);
     tracked!(precise_enum_drop_elaboration, false);
-- 
cgit 1.4.1-3-g733a5


From decfb4d123651a0673db47542e18ca60d1c501ac Mon Sep 17 00:00:00 2001
From: Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de>
Date: Tue, 21 Feb 2023 08:37:10 +0000
Subject: Use a lock-free datastructure for `source_span`

---
 Cargo.lock                                     | 10 +++++++
 compiler/rustc_data_structures/Cargo.toml      |  1 +
 compiler/rustc_data_structures/src/sync.rs     |  4 +++
 compiler/rustc_data_structures/src/sync/vec.rs | 41 ++++++++++++++++++++++++++
 compiler/rustc_interface/src/queries.rs        |  6 ++--
 compiler/rustc_middle/src/ty/context.rs        |  5 ++--
 compiler/rustc_query_system/src/ich/hcx.rs     |  2 +-
 compiler/rustc_resolve/src/lib.rs              |  2 +-
 compiler/rustc_session/src/cstore.rs           |  5 ++--
 src/tools/tidy/src/deps.rs                     |  1 +
 10 files changed, 65 insertions(+), 12 deletions(-)
 create mode 100644 compiler/rustc_data_structures/src/sync/vec.rs

(limited to 'compiler/rustc_interface/src')

diff --git a/Cargo.lock b/Cargo.lock
index 6c17edd3020..93f8eda66bb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1378,6 +1378,15 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "elsa"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f74077c3c3aedb99a2683919698285596662518ea13e5eedcf8bdd43b0d0453b"
+dependencies = [
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "ena"
 version = "0.14.0"
@@ -3882,6 +3891,7 @@ dependencies = [
  "arrayvec 0.7.0",
  "bitflags",
  "cfg-if",
+ "elsa",
  "ena",
  "indexmap",
  "jobserver",
diff --git a/compiler/rustc_data_structures/Cargo.toml b/compiler/rustc_data_structures/Cargo.toml
index 0366fb0a148..a6601fbf43b 100644
--- a/compiler/rustc_data_structures/Cargo.toml
+++ b/compiler/rustc_data_structures/Cargo.toml
@@ -31,6 +31,7 @@ stacker = "0.1.15"
 tempfile = "3.2"
 thin-vec = "0.2.9"
 tracing = "0.1"
+elsa = "1.8"
 
 [dependencies.parking_lot]
 version = "0.11"
diff --git a/compiler/rustc_data_structures/src/sync.rs b/compiler/rustc_data_structures/src/sync.rs
index ad71dcdf9d9..31323c21df0 100644
--- a/compiler/rustc_data_structures/src/sync.rs
+++ b/compiler/rustc_data_structures/src/sync.rs
@@ -26,6 +26,10 @@ use std::panic::{catch_unwind, resume_unwind, AssertUnwindSafe};
 pub use std::sync::atomic::Ordering;
 pub use std::sync::atomic::Ordering::SeqCst;
 
+pub use vec::AppendOnlyVec;
+
+mod vec;
+
 cfg_if! {
     if #[cfg(not(parallel_compiler))] {
         pub auto trait Send {}
diff --git a/compiler/rustc_data_structures/src/sync/vec.rs b/compiler/rustc_data_structures/src/sync/vec.rs
new file mode 100644
index 00000000000..cbea4f05999
--- /dev/null
+++ b/compiler/rustc_data_structures/src/sync/vec.rs
@@ -0,0 +1,41 @@
+use std::marker::PhantomData;
+
+use rustc_index::vec::Idx;
+
+pub struct AppendOnlyVec<I: Idx, T: Copy> {
+    #[cfg(not(parallel_compiler))]
+    vec: elsa::vec::FrozenVec<T>,
+    #[cfg(parallel_compiler)]
+    vec: elsa::sync::LockFreeFrozenVec<T>,
+    _marker: PhantomData<fn(&I)>,
+}
+
+impl<I: Idx, T: Copy> AppendOnlyVec<I, T> {
+    pub fn new() -> Self {
+        Self {
+            #[cfg(not(parallel_compiler))]
+            vec: elsa::vec::FrozenVec::new(),
+            #[cfg(parallel_compiler)]
+            vec: elsa::sync::LockFreeFrozenVec::new(),
+            _marker: PhantomData,
+        }
+    }
+
+    pub fn push(&self, val: T) -> I {
+        #[cfg(not(parallel_compiler))]
+        let i = self.vec.len();
+        #[cfg(not(parallel_compiler))]
+        self.vec.push(val);
+        #[cfg(parallel_compiler)]
+        let i = self.vec.push(val);
+        I::new(i)
+    }
+
+    pub fn get(&self, i: I) -> Option<T> {
+        let i = i.index();
+        #[cfg(not(parallel_compiler))]
+        return self.vec.get_copy(i);
+        #[cfg(parallel_compiler)]
+        return self.vec.get(i);
+    }
+}
diff --git a/compiler/rustc_interface/src/queries.rs b/compiler/rustc_interface/src/queries.rs
index c957578b59e..a96cc95a384 100644
--- a/compiler/rustc_interface/src/queries.rs
+++ b/compiler/rustc_interface/src/queries.rs
@@ -7,11 +7,10 @@ use rustc_codegen_ssa::traits::CodegenBackend;
 use rustc_codegen_ssa::CodegenResults;
 use rustc_data_structures::steal::Steal;
 use rustc_data_structures::svh::Svh;
-use rustc_data_structures::sync::{Lrc, OnceCell, RwLock, WorkerLocal};
+use rustc_data_structures::sync::{AppendOnlyVec, Lrc, OnceCell, RwLock, WorkerLocal};
 use rustc_hir::def_id::{CRATE_DEF_ID, LOCAL_CRATE};
 use rustc_hir::definitions::Definitions;
 use rustc_incremental::DepGraphFuture;
-use rustc_index::vec::IndexVec;
 use rustc_lint::LintStore;
 use rustc_metadata::creader::CStore;
 use rustc_middle::arena::Arena;
@@ -195,10 +194,9 @@ impl<'tcx> Queries<'tcx> {
 
             let cstore = RwLock::new(Box::new(CStore::new(sess)) as _);
             let definitions = RwLock::new(Definitions::new(sess.local_stable_crate_id()));
-            let mut source_span = IndexVec::default();
+            let source_span = AppendOnlyVec::new();
             let _id = source_span.push(krate.spans.inner_span);
             debug_assert_eq!(_id, CRATE_DEF_ID);
-            let source_span = RwLock::new(source_span);
             let untracked = Untracked { cstore, source_span, definitions };
 
             let qcx = passes::create_global_ctxt(
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index cf4836ded47..d95e4b56de0 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -1030,7 +1030,7 @@ impl<'tcx> TyCtxt<'tcx> {
     /// system if the result is otherwise tracked through queries
     #[inline]
     pub fn source_span_untracked(self, def_id: LocalDefId) -> Span {
-        self.untracked.source_span.read().get(def_id).copied().unwrap_or(DUMMY_SP)
+        self.untracked.source_span.get(def_id).unwrap_or(DUMMY_SP)
     }
 
     #[inline(always)]
@@ -2521,6 +2521,5 @@ pub fn provide(providers: &mut ty::query::Providers) {
         // We want to check if the panic handler was defined in this crate
         tcx.lang_items().panic_impl().map_or(false, |did| did.is_local())
     };
-    providers.source_span =
-        |tcx, def_id| tcx.untracked.source_span.read().get(def_id).copied().unwrap_or(DUMMY_SP);
+    providers.source_span = |tcx, def_id| tcx.untracked.source_span.get(def_id).unwrap_or(DUMMY_SP);
 }
diff --git a/compiler/rustc_query_system/src/ich/hcx.rs b/compiler/rustc_query_system/src/ich/hcx.rs
index 8db8ee9428b..5593a15412f 100644
--- a/compiler/rustc_query_system/src/ich/hcx.rs
+++ b/compiler/rustc_query_system/src/ich/hcx.rs
@@ -146,7 +146,7 @@ impl<'a> rustc_span::HashStableContext for StableHashingContext<'a> {
 
     #[inline]
     fn def_span(&self, def_id: LocalDefId) -> Span {
-        *self.untracked.source_span.read().get(def_id).unwrap_or(&DUMMY_SP)
+        self.untracked.source_span.get(def_id).unwrap_or(DUMMY_SP)
     }
 
     #[inline]
diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index 66034baaa0b..9fd7edeb5a1 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -1156,7 +1156,7 @@ impl<'tcx> Resolver<'_, 'tcx> {
 
         // A relative span's parent must be an absolute span.
         debug_assert_eq!(span.data_untracked().parent, None);
-        let _id = self.tcx.untracked().source_span.write().push(span);
+        let _id = self.tcx.untracked().source_span.push(span);
         debug_assert_eq!(_id, def_id);
 
         // Some things for which we allocate `LocalDefId`s don't correspond to
diff --git a/compiler/rustc_session/src/cstore.rs b/compiler/rustc_session/src/cstore.rs
index ff13a0bbf3f..868ffdf0f1d 100644
--- a/compiler/rustc_session/src/cstore.rs
+++ b/compiler/rustc_session/src/cstore.rs
@@ -6,10 +6,9 @@ use crate::search_paths::PathKind;
 use crate::utils::NativeLibKind;
 use crate::Session;
 use rustc_ast as ast;
-use rustc_data_structures::sync::{self, MetadataRef, RwLock};
+use rustc_data_structures::sync::{self, AppendOnlyVec, MetadataRef, RwLock};
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, StableCrateId, LOCAL_CRATE};
 use rustc_hir::definitions::{DefKey, DefPath, DefPathHash, Definitions};
-use rustc_index::vec::IndexVec;
 use rustc_span::hygiene::{ExpnHash, ExpnId};
 use rustc_span::symbol::Symbol;
 use rustc_span::Span;
@@ -255,6 +254,6 @@ pub type CrateStoreDyn = dyn CrateStore + sync::Sync + sync::Send;
 pub struct Untracked {
     pub cstore: RwLock<Box<CrateStoreDyn>>,
     /// Reference span for definitions.
-    pub source_span: RwLock<IndexVec<LocalDefId, Span>>,
+    pub source_span: AppendOnlyVec<LocalDefId, Span>,
     pub definitions: RwLock<Definitions>,
 }
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 4c93f8a16b6..bddfdcfaf19 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -120,6 +120,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "dissimilar",
     "dlmalloc",
     "either",
+    "elsa",
     "ena",
     "expect-test",
     "fallible-iterator", // dependency of `thorin`
-- 
cgit 1.4.1-3-g733a5


From d1fcf611175e695c35c6cc0537d710277c1a5c6f Mon Sep 17 00:00:00 2001
From: David Wood <david.wood@huawei.com>
Date: Thu, 13 Oct 2022 10:13:02 +0100
Subject: errors: generate typed identifiers in each crate

Instead of loading the Fluent resources for every crate in
`rustc_error_messages`, each crate generates typed identifiers for its
own diagnostics and creates a static which are pulled together in the
`rustc_driver` crate and provided to the diagnostic emitter.

Signed-off-by: David Wood <david.wood@huawei.com>
---
 Cargo.lock                                         |  21 +
 compiler/rustc_ast_lowering/locales/en-US.ftl      | 141 ++++
 compiler/rustc_ast_lowering/src/errors.rs          |   2 +-
 compiler/rustc_ast_lowering/src/lib.rs             |  13 +-
 compiler/rustc_ast_passes/locales/en-US.ftl        |  92 +++
 compiler/rustc_ast_passes/src/ast_validation.rs    |   7 +-
 compiler/rustc_ast_passes/src/errors.rs            |   6 +-
 compiler/rustc_ast_passes/src/feature_gate.rs      |   2 +-
 compiler/rustc_ast_passes/src/lib.rs               |   5 +
 compiler/rustc_attr/locales/en-US.ftl              | 107 +++
 compiler/rustc_attr/src/lib.rs                     |   5 +
 compiler/rustc_attr/src/session_diagnostics.rs     |  19 +-
 compiler/rustc_borrowck/locales/en-US.ftl          | 129 ++++
 compiler/rustc_borrowck/src/lib.rs                 |   5 +-
 compiler/rustc_borrowck/src/session_diagnostics.rs |   4 +-
 compiler/rustc_builtin_macros/locales/en-US.ftl    |   5 +
 compiler/rustc_builtin_macros/src/lib.rs           |   4 +
 compiler/rustc_codegen_gcc/locales/en-US.ftl       |  62 ++
 compiler/rustc_codegen_gcc/src/lib.rs              |   5 +-
 compiler/rustc_codegen_llvm/locales/en-US.ftl      |  89 +++
 compiler/rustc_codegen_llvm/src/errors.rs          |   7 +-
 compiler/rustc_codegen_llvm/src/lib.rs             |   5 +-
 compiler/rustc_codegen_ssa/locales/en-US.ftl       | 293 ++++++++
 compiler/rustc_codegen_ssa/src/errors.rs           |   5 +-
 compiler/rustc_codegen_ssa/src/lib.rs              |   4 +
 compiler/rustc_const_eval/locales/en-US.ftl        |  83 +++
 compiler/rustc_const_eval/src/errors.rs            |  18 +-
 compiler/rustc_const_eval/src/lib.rs               |   4 +
 compiler/rustc_driver_impl/Cargo.toml              |  21 +
 compiler/rustc_driver_impl/locales/en-US.ftl       |  19 +
 compiler/rustc_driver_impl/src/lib.rs              |  48 +-
 compiler/rustc_error_messages/locales/en-US.ftl    |   1 +
 .../locales/en-US/ast_lowering.ftl                 | 141 ----
 .../locales/en-US/ast_passes.ftl                   |  92 ---
 .../rustc_error_messages/locales/en-US/attr.ftl    | 107 ---
 .../locales/en-US/borrowck.ftl                     | 129 ----
 .../locales/en-US/builtin_macros.ftl               |   5 -
 .../locales/en-US/codegen_gcc.ftl                  |  62 --
 .../locales/en-US/codegen_llvm.ftl                 |  89 ---
 .../locales/en-US/codegen_ssa.ftl                  | 293 --------
 .../locales/en-US/compiletest.ftl                  |   5 -
 .../locales/en-US/const_eval.ftl                   |  83 ---
 .../rustc_error_messages/locales/en-US/driver.ftl  |  19 -
 .../rustc_error_messages/locales/en-US/errors.ftl  |  13 -
 .../rustc_error_messages/locales/en-US/expand.ftl  | 131 ----
 .../locales/en-US/hir_analysis.ftl                 | 129 ----
 .../locales/en-US/hir_typeck.ftl                   |  65 --
 .../locales/en-US/incremental.ftl                  | 118 ----
 .../rustc_error_messages/locales/en-US/infer.ftl   | 347 ----------
 .../locales/en-US/interface.ftl                    |  56 --
 .../rustc_error_messages/locales/en-US/lint.ftl    | 503 --------------
 .../locales/en-US/metadata.ftl                     | 288 --------
 .../rustc_error_messages/locales/en-US/middle.ftl  |  36 -
 .../locales/en-US/mir_build.ftl                    | 376 -----------
 .../locales/en-US/mir_dataflow.ftl                 |  29 -
 .../locales/en-US/monomorphize.ftl                 |  32 -
 .../rustc_error_messages/locales/en-US/parse.ftl   | 702 -------------------
 .../rustc_error_messages/locales/en-US/passes.ftl  | 747 ---------------------
 .../locales/en-US/plugin_impl.ftl                  |   4 -
 .../rustc_error_messages/locales/en-US/privacy.ftl |  23 -
 .../locales/en-US/query_system.ftl                 |  30 -
 .../rustc_error_messages/locales/en-US/resolve.ftl | 211 ------
 .../rustc_error_messages/locales/en-US/session.ftl |  95 ---
 .../locales/en-US/symbol_mangling.ftl              |   1 -
 .../locales/en-US/trait_selection.ftl              |  22 -
 .../locales/en-US/ty_utils.ftl                     |  47 --
 compiler/rustc_error_messages/src/lib.rs           |  42 +-
 compiler/rustc_errors/locales/en-US.ftl            |  19 +
 compiler/rustc_errors/src/diagnostic_impls.rs      |   5 +-
 compiler/rustc_errors/src/json/tests.rs            |   4 +-
 compiler/rustc_errors/src/lib.rs                   |   6 +-
 compiler/rustc_expand/locales/en-US.ftl            | 131 ++++
 compiler/rustc_expand/src/errors.rs                |  14 +-
 compiler/rustc_expand/src/lib.rs                   |   5 +
 compiler/rustc_expand/src/parse/tests.rs           |   5 +-
 compiler/rustc_expand/src/tests.rs                 |  10 +-
 compiler/rustc_hir_analysis/locales/en-US.ftl      | 131 ++++
 compiler/rustc_hir_analysis/src/errors.rs          |  33 +-
 compiler/rustc_hir_analysis/src/lib.rs             |   4 +
 compiler/rustc_hir_typeck/locales/en-US.ftl        |  79 +++
 compiler/rustc_hir_typeck/src/errors.rs            |  20 +-
 .../rustc_hir_typeck/src/fn_ctxt/suggestions.rs    |   3 +-
 compiler/rustc_hir_typeck/src/lib.rs               |   8 +-
 compiler/rustc_incremental/locales/en-US.ftl       | 118 ++++
 compiler/rustc_incremental/src/lib.rs              |   5 +
 compiler/rustc_infer/locales/en-US.ftl             | 347 ++++++++++
 compiler/rustc_infer/src/errors/mod.rs             |  35 +-
 .../rustc_infer/src/errors/note_and_explain.rs     |   5 +-
 .../rustc_infer/src/infer/error_reporting/note.rs  |   3 +-
 compiler/rustc_infer/src/lib.rs                    |   5 +
 compiler/rustc_interface/locales/en-US.ftl         |  56 ++
 compiler/rustc_interface/src/interface.rs          |   2 +
 compiler/rustc_interface/src/lib.rs                |   5 +
 compiler/rustc_interface/src/tests.rs              |   2 +-
 compiler/rustc_interface/src/util.rs               |   2 +
 compiler/rustc_lint/locales/en-US.ftl              | 503 ++++++++++++++
 compiler/rustc_lint/src/array_into_iter.rs         |   6 +-
 compiler/rustc_lint/src/builtin.rs                 |   3 +-
 compiler/rustc_lint/src/errors.rs                  |   6 +-
 compiler/rustc_lint/src/levels.rs                  |  17 +-
 compiler/rustc_lint/src/lib.rs                     |   4 +
 compiler/rustc_lint/src/lints.rs                   | 120 ++--
 compiler/rustc_lint/src/non_fmt_panic.rs           |  18 +-
 .../rustc_lint/src/opaque_hidden_inferred_bound.rs |   2 +-
 compiler/rustc_lint/src/types.rs                   |  15 +-
 .../rustc_macros/src/diagnostics/diagnostic.rs     |   4 +-
 .../src/diagnostics/diagnostic_builder.rs          |   6 +-
 compiler/rustc_macros/src/diagnostics/fluent.rs    | 449 ++++++-------
 .../rustc_macros/src/diagnostics/subdiagnostic.rs  |   4 +-
 compiler/rustc_macros/src/lib.rs                   |   8 +-
 compiler/rustc_metadata/locales/en-US.ftl          | 288 ++++++++
 compiler/rustc_metadata/src/errors.rs              |  23 +-
 compiler/rustc_metadata/src/lib.rs                 |   4 +
 compiler/rustc_middle/locales/en-US.ftl            |  36 +
 compiler/rustc_middle/src/lib.rs                   |   5 +
 compiler/rustc_middle/src/ty/diagnostics.rs        |   8 +
 compiler/rustc_middle/src/ty/layout.rs             |   7 +-
 compiler/rustc_mir_build/locales/en-US.ftl         | 376 +++++++++++
 compiler/rustc_mir_build/src/errors.rs             |  39 +-
 compiler/rustc_mir_build/src/lib.rs                |   5 +
 compiler/rustc_mir_dataflow/locales/en-US.ftl      |  29 +
 compiler/rustc_mir_dataflow/src/lib.rs             |   4 +
 compiler/rustc_monomorphize/locales/en-US.ftl      |  32 +
 compiler/rustc_monomorphize/src/errors.rs          |   3 +-
 compiler/rustc_monomorphize/src/lib.rs             |   4 +
 compiler/rustc_parse/locales/en-US.ftl             | 730 ++++++++++++++++++++
 compiler/rustc_parse/src/errors.rs                 | 188 +++---
 compiler/rustc_parse/src/lib.rs                    |   4 +
 compiler/rustc_parse/src/parser/attr.rs            |  19 +-
 compiler/rustc_parse/src/parser/diagnostics.rs     |   6 +-
 compiler/rustc_parse/src/parser/pat.rs             |   5 +-
 compiler/rustc_passes/locales/en-US.ftl            | 747 +++++++++++++++++++++
 compiler/rustc_passes/src/check_attr.rs            |  10 +-
 compiler/rustc_passes/src/errors.rs                |  92 ++-
 compiler/rustc_passes/src/lib.rs                   |   4 +
 compiler/rustc_plugin_impl/locales/en-US.ftl       |   4 +
 compiler/rustc_plugin_impl/src/lib.rs              |   4 +
 compiler/rustc_privacy/locales/en-US.ftl           |  23 +
 compiler/rustc_privacy/src/errors.rs               |   4 +-
 compiler/rustc_privacy/src/lib.rs                  |   4 +
 compiler/rustc_query_system/locales/en-US.ftl      |  30 +
 compiler/rustc_query_system/src/lib.rs             |   5 +
 compiler/rustc_resolve/locales/en-US.ftl           | 211 ++++++
 compiler/rustc_resolve/src/errors.rs               |  14 +-
 compiler/rustc_resolve/src/lib.rs                  |   7 +-
 compiler/rustc_session/locales/en-US.ftl           |  95 +++
 compiler/rustc_session/src/lib.rs                  |   5 +
 compiler/rustc_session/src/parse.rs                |   9 +-
 compiler/rustc_session/src/session.rs              |  10 +-
 compiler/rustc_symbol_mangling/locales/en-US.ftl   |   1 +
 compiler/rustc_symbol_mangling/src/lib.rs          |   4 +
 compiler/rustc_trait_selection/locales/en-US.ftl   |  22 +
 compiler/rustc_trait_selection/src/errors.rs       |  11 +-
 compiler/rustc_trait_selection/src/lib.rs          |   5 +
 compiler/rustc_ty_utils/locales/en-US.ftl          |  47 ++
 compiler/rustc_ty_utils/src/errors.rs              |   2 +-
 compiler/rustc_ty_utils/src/lib.rs                 |   4 +
 src/librustdoc/clean/render_macro_matchers.rs      |   2 +-
 src/librustdoc/core.rs                             |   3 +-
 src/librustdoc/doctest.rs                          |   5 +-
 .../passes/lint/check_code_block_syntax.rs         |   2 +-
 src/tools/clippy/clippy_lints/src/doc.rs           |   2 +-
 src/tools/clippy/src/driver.rs                     |   2 +-
 src/tools/rustfmt/src/parse/session.rs             |   2 +-
 tests/run-make-fulldeps/issue-19371/foo.rs         |   1 +
 tests/ui-fulldeps/fluent-messages/duplicate.ftl    |   3 +
 .../fluent-messages/label-with-hyphens.ftl         |   2 +-
 .../fluent-messages/missing-crate-name.ftl         |   2 +-
 .../fluent-messages/missing-message-ref.ftl        |   2 +-
 .../fluent-messages/missing-message.ftl            |   2 +-
 .../fluent-messages/slug-with-hyphens.ftl          |   2 +-
 tests/ui-fulldeps/fluent-messages/test.rs          |  69 +-
 tests/ui-fulldeps/fluent-messages/test.stderr      |  97 ++-
 tests/ui-fulldeps/fluent-messages/valid.ftl        |   2 +-
 tests/ui-fulldeps/internal-lints/diagnostics.ftl   |   5 +
 tests/ui-fulldeps/internal-lints/diagnostics.rs    |  16 +-
 .../ui-fulldeps/internal-lints/diagnostics.stderr  |  12 +-
 tests/ui-fulldeps/mod_dir_path_canonicalized.rs    |   4 +-
 tests/ui-fulldeps/pprust-expr-roundtrip.rs         |   4 +-
 .../session-diagnostic/diagnostic-derive.rs        | 298 ++++----
 .../session-diagnostic/diagnostic-derive.stderr    | 338 +++++-----
 tests/ui-fulldeps/session-diagnostic/example.ftl   |   5 +
 .../session-diagnostic/subdiagnostic-derive.rs     | 152 ++---
 .../session-diagnostic/subdiagnostic-derive.stderr | 264 ++++----
 184 files changed, 6649 insertions(+), 6368 deletions(-)
 create mode 100644 compiler/rustc_ast_lowering/locales/en-US.ftl
 create mode 100644 compiler/rustc_ast_passes/locales/en-US.ftl
 create mode 100644 compiler/rustc_attr/locales/en-US.ftl
 create mode 100644 compiler/rustc_borrowck/locales/en-US.ftl
 create mode 100644 compiler/rustc_builtin_macros/locales/en-US.ftl
 create mode 100644 compiler/rustc_codegen_gcc/locales/en-US.ftl
 create mode 100644 compiler/rustc_codegen_llvm/locales/en-US.ftl
 create mode 100644 compiler/rustc_codegen_ssa/locales/en-US.ftl
 create mode 100644 compiler/rustc_const_eval/locales/en-US.ftl
 create mode 100644 compiler/rustc_driver_impl/locales/en-US.ftl
 create mode 100644 compiler/rustc_error_messages/locales/en-US.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/ast_lowering.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/ast_passes.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/attr.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/borrowck.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/builtin_macros.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/codegen_gcc.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/codegen_llvm.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/codegen_ssa.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/compiletest.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/const_eval.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/driver.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/errors.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/expand.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/hir_typeck.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/incremental.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/infer.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/interface.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/lint.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/metadata.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/middle.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/mir_build.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/mir_dataflow.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/monomorphize.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/parse.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/passes.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/plugin_impl.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/privacy.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/query_system.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/resolve.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/session.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/symbol_mangling.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/trait_selection.ftl
 delete mode 100644 compiler/rustc_error_messages/locales/en-US/ty_utils.ftl
 create mode 100644 compiler/rustc_errors/locales/en-US.ftl
 create mode 100644 compiler/rustc_expand/locales/en-US.ftl
 create mode 100644 compiler/rustc_hir_analysis/locales/en-US.ftl
 create mode 100644 compiler/rustc_hir_typeck/locales/en-US.ftl
 create mode 100644 compiler/rustc_incremental/locales/en-US.ftl
 create mode 100644 compiler/rustc_infer/locales/en-US.ftl
 create mode 100644 compiler/rustc_interface/locales/en-US.ftl
 create mode 100644 compiler/rustc_lint/locales/en-US.ftl
 create mode 100644 compiler/rustc_metadata/locales/en-US.ftl
 create mode 100644 compiler/rustc_middle/locales/en-US.ftl
 create mode 100644 compiler/rustc_mir_build/locales/en-US.ftl
 create mode 100644 compiler/rustc_mir_dataflow/locales/en-US.ftl
 create mode 100644 compiler/rustc_monomorphize/locales/en-US.ftl
 create mode 100644 compiler/rustc_parse/locales/en-US.ftl
 create mode 100644 compiler/rustc_passes/locales/en-US.ftl
 create mode 100644 compiler/rustc_plugin_impl/locales/en-US.ftl
 create mode 100644 compiler/rustc_privacy/locales/en-US.ftl
 create mode 100644 compiler/rustc_query_system/locales/en-US.ftl
 create mode 100644 compiler/rustc_resolve/locales/en-US.ftl
 create mode 100644 compiler/rustc_session/locales/en-US.ftl
 create mode 100644 compiler/rustc_symbol_mangling/locales/en-US.ftl
 create mode 100644 compiler/rustc_trait_selection/locales/en-US.ftl
 create mode 100644 compiler/rustc_ty_utils/locales/en-US.ftl
 create mode 100644 tests/ui-fulldeps/fluent-messages/duplicate.ftl
 create mode 100644 tests/ui-fulldeps/internal-lints/diagnostics.ftl
 create mode 100644 tests/ui-fulldeps/session-diagnostic/example.ftl

(limited to 'compiler/rustc_interface/src')

diff --git a/Cargo.lock b/Cargo.lock
index 4d6530508b3..cb1cd3cbfe5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3920,26 +3920,47 @@ version = "0.0.0"
 dependencies = [
  "libc",
  "rustc_ast",
+ "rustc_ast_lowering",
+ "rustc_ast_passes",
  "rustc_ast_pretty",
+ "rustc_attr",
+ "rustc_borrowck",
+ "rustc_builtin_macros",
  "rustc_codegen_ssa",
+ "rustc_const_eval",
  "rustc_data_structures",
  "rustc_error_codes",
+ "rustc_error_messages",
  "rustc_errors",
+ "rustc_expand",
  "rustc_feature",
  "rustc_hir",
  "rustc_hir_analysis",
  "rustc_hir_pretty",
+ "rustc_hir_typeck",
+ "rustc_incremental",
+ "rustc_infer",
  "rustc_interface",
  "rustc_lint",
  "rustc_log",
  "rustc_macros",
  "rustc_metadata",
  "rustc_middle",
+ "rustc_mir_build",
+ "rustc_mir_dataflow",
+ "rustc_monomorphize",
  "rustc_parse",
+ "rustc_passes",
  "rustc_plugin_impl",
+ "rustc_privacy",
+ "rustc_query_system",
+ "rustc_resolve",
  "rustc_session",
  "rustc_span",
+ "rustc_symbol_mangling",
  "rustc_target",
+ "rustc_trait_selection",
+ "rustc_ty_utils",
  "serde_json",
  "tracing",
  "winapi",
diff --git a/compiler/rustc_ast_lowering/locales/en-US.ftl b/compiler/rustc_ast_lowering/locales/en-US.ftl
new file mode 100644
index 00000000000..03c88c6c0eb
--- /dev/null
+++ b/compiler/rustc_ast_lowering/locales/en-US.ftl
@@ -0,0 +1,141 @@
+ast_lowering_generic_type_with_parentheses =
+    parenthesized type parameters may only be used with a `Fn` trait
+    .label = only `Fn` traits may use parentheses
+
+ast_lowering_use_angle_brackets = use angle brackets instead
+
+ast_lowering_invalid_abi =
+    invalid ABI: found `{$abi}`
+    .label = invalid ABI
+    .note = invoke `{$command}` for a full list of supported calling conventions.
+
+ast_lowering_invalid_abi_suggestion = did you mean
+
+ast_lowering_assoc_ty_parentheses =
+    parenthesized generic arguments cannot be used in associated type constraints
+
+ast_lowering_remove_parentheses = remove these parentheses
+
+ast_lowering_misplaced_impl_trait =
+    `impl Trait` only allowed in function and inherent method return types, not in {$position}
+
+ast_lowering_rustc_box_attribute_error =
+    #[rustc_box] requires precisely one argument and no other attributes are allowed
+
+ast_lowering_underscore_expr_lhs_assign =
+    in expressions, `_` can only be used on the left-hand side of an assignment
+    .label = `_` not allowed here
+
+ast_lowering_base_expression_double_dot =
+    base expression required after `..`
+    .label = add a base expression here
+
+ast_lowering_await_only_in_async_fn_and_blocks =
+    `await` is only allowed inside `async` functions and blocks
+    .label = only allowed inside `async` functions and blocks
+
+ast_lowering_this_not_async = this is not `async`
+
+ast_lowering_generator_too_many_parameters =
+    too many parameters for a generator (expected 0 or 1 parameters)
+
+ast_lowering_closure_cannot_be_static = closures cannot be static
+
+ast_lowering_async_non_move_closure_not_supported =
+    `async` non-`move` closures with parameters are not currently supported
+    .help = consider using `let` statements to manually capture variables by reference before entering an `async move` closure
+
+ast_lowering_functional_record_update_destructuring_assignment =
+    functional record updates are not allowed in destructuring assignments
+    .suggestion = consider removing the trailing pattern
+
+ast_lowering_async_generators_not_supported =
+    `async` generators are not yet supported
+
+ast_lowering_inline_asm_unsupported_target =
+    inline assembly is unsupported on this target
+
+ast_lowering_att_syntax_only_x86 =
+    the `att_syntax` option is only supported on x86
+
+ast_lowering_abi_specified_multiple_times =
+    `{$prev_name}` ABI specified multiple times
+    .label = previously specified here
+    .note = these ABIs are equivalent on the current target
+
+ast_lowering_clobber_abi_not_supported =
+    `clobber_abi` is not supported on this target
+
+ast_lowering_invalid_abi_clobber_abi =
+    invalid ABI for `clobber_abi`
+    .note = the following ABIs are supported on this target: {$supported_abis}
+
+ast_lowering_invalid_register =
+    invalid register `{$reg}`: {$error}
+
+ast_lowering_invalid_register_class =
+    invalid register class `{$reg_class}`: {$error}
+
+ast_lowering_invalid_asm_template_modifier_reg_class =
+    invalid asm template modifier for this register class
+
+ast_lowering_argument = argument
+
+ast_lowering_template_modifier = template modifier
+
+ast_lowering_support_modifiers =
+    the `{$class_name}` register class supports the following template modifiers: {$modifiers}
+
+ast_lowering_does_not_support_modifiers =
+    the `{$class_name}` register class does not support template modifiers
+
+ast_lowering_invalid_asm_template_modifier_const =
+    asm template modifiers are not allowed for `const` arguments
+
+ast_lowering_invalid_asm_template_modifier_sym =
+    asm template modifiers are not allowed for `sym` arguments
+
+ast_lowering_register_class_only_clobber =
+    register class `{$reg_class_name}` can only be used as a clobber, not as an input or output
+
+ast_lowering_register_conflict =
+    register `{$reg1_name}` conflicts with register `{$reg2_name}`
+    .help = use `lateout` instead of `out` to avoid conflict
+
+ast_lowering_register1 = register `{$reg1_name}`
+
+ast_lowering_register2 = register `{$reg2_name}`
+
+ast_lowering_sub_tuple_binding =
+    `{$ident_name} @` is not allowed in a {$ctx}
+    .label = this is only allowed in slice patterns
+    .help = remove this and bind each tuple field independently
+
+ast_lowering_sub_tuple_binding_suggestion = if you don't need to use the contents of {$ident}, discard the tuple's remaining fields
+
+ast_lowering_extra_double_dot =
+    `..` can only be used once per {$ctx} pattern
+    .label = can only be used once per {$ctx} pattern
+
+ast_lowering_previously_used_here = previously used here
+
+ast_lowering_misplaced_double_dot =
+    `..` patterns are not allowed here
+    .note = only allowed in tuple, tuple struct, and slice patterns
+
+ast_lowering_misplaced_relax_trait_bound =
+    `?Trait` bounds are only permitted at the point where a type parameter is declared
+
+ast_lowering_not_supported_for_lifetime_binder_async_closure =
+    `for<...>` binders on `async` closures are not currently supported
+
+ast_lowering_arbitrary_expression_in_pattern =
+    arbitrary expressions aren't allowed in patterns
+
+ast_lowering_inclusive_range_with_no_end = inclusive range with no end
+
+ast_lowering_trait_fn_async =
+    functions in traits cannot be declared `async`
+    .label = `async` because of this
+    .note = `async` trait functions are not currently supported
+    .note2 = consider using the `async-trait` crate: https://crates.io/crates/async-trait
diff --git a/compiler/rustc_ast_lowering/src/errors.rs b/compiler/rustc_ast_lowering/src/errors.rs
index 21c6a2d26f4..8b302ac2142 100644
--- a/compiler/rustc_ast_lowering/src/errors.rs
+++ b/compiler/rustc_ast_lowering/src/errors.rs
@@ -339,7 +339,7 @@ pub struct InclusiveRangeWithNoEnd {
 #[derive(Diagnostic, Clone, Copy)]
 #[diag(ast_lowering_trait_fn_async, code = "E0706")]
 #[note]
-#[note(note2)]
+#[note(ast_lowering_note2)]
 pub struct TraitFnAsync {
     #[primary_span]
     pub fn_span: Span,
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
index b1b9344d253..a726fbb72e9 100644
--- a/compiler/rustc_ast_lowering/src/lib.rs
+++ b/compiler/rustc_ast_lowering/src/lib.rs
@@ -52,15 +52,20 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sorted_map::SortedMap;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::sync::Lrc;
-use rustc_errors::{DiagnosticArgFromDisplay, Handler, StashKey};
+use rustc_errors::{
+    DiagnosticArgFromDisplay, DiagnosticMessage, Handler, StashKey, SubdiagnosticMessage,
+};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, LifetimeRes, Namespace, PartialRes, PerNS, Res};
 use rustc_hir::def_id::{LocalDefId, CRATE_DEF_ID};
 use rustc_hir::definitions::DefPathData;
 use rustc_hir::{ConstArg, GenericArg, ItemLocalId, ParamName, TraitCandidate};
 use rustc_index::vec::{Idx, IndexVec};
-use rustc_middle::span_bug;
-use rustc_middle::ty::{ResolverAstLowering, TyCtxt};
+use rustc_macros::fluent_messages;
+use rustc_middle::{
+    span_bug,
+    ty::{ResolverAstLowering, TyCtxt},
+};
 use rustc_session::parse::feature_err;
 use rustc_span::hygiene::MacroKind;
 use rustc_span::source_map::DesugaringKind;
@@ -87,6 +92,8 @@ mod lifetime_collector;
 mod pat;
 mod path;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 struct LoweringContext<'a, 'hir> {
     tcx: TyCtxt<'hir>,
     resolver: &'a mut ResolverAstLowering,
diff --git a/compiler/rustc_ast_passes/locales/en-US.ftl b/compiler/rustc_ast_passes/locales/en-US.ftl
new file mode 100644
index 00000000000..5f28839f136
--- /dev/null
+++ b/compiler/rustc_ast_passes/locales/en-US.ftl
@@ -0,0 +1,92 @@
+ast_passes_forbidden_let =
+    `let` expressions are not supported here
+    .note = only supported directly in conditions of `if` and `while` expressions
+    .not_supported_or = `||` operators are not supported in let chain expressions
+    .not_supported_parentheses = `let`s wrapped in parentheses are not supported in a context with let chains
+
+ast_passes_forbidden_let_stable =
+    expected expression, found statement (`let`)
+    .note = variable declaration using `let` is a statement
+
+ast_passes_deprecated_where_clause_location =
+    where clause not allowed here
+
+ast_passes_forbidden_assoc_constraint =
+    associated type bounds are not allowed within structs, enums, or unions
+
+ast_passes_keyword_lifetime =
+    lifetimes cannot use keyword names
+
+ast_passes_invalid_label =
+    invalid label name `{$name}`
+
+ast_passes_invalid_visibility =
+    unnecessary visibility qualifier
+    .implied = `pub` not permitted here because it's implied
+    .individual_impl_items = place qualifiers on individual impl items instead
+    .individual_foreign_items = place qualifiers on individual foreign items instead
+
+ast_passes_trait_fn_const =
+    functions in traits cannot be declared const
+    .label = functions in traits cannot be const
+
+ast_passes_forbidden_lifetime_bound =
+    lifetime bounds cannot be used in this context
+
+ast_passes_forbidden_non_lifetime_param =
+    only lifetime parameters can be used in this context
+
+ast_passes_fn_param_too_many =
+    function can not have more than {$max_num_args} arguments
+
+ast_passes_fn_param_c_var_args_only =
+    C-variadic function must be declared with at least one named argument
+
+ast_passes_fn_param_c_var_args_not_last =
+    `...` must be the last argument of a C-variadic function
+
+ast_passes_fn_param_doc_comment =
+    documentation comments cannot be applied to function parameters
+    .label = doc comments are not allowed here
+
+ast_passes_fn_param_forbidden_attr =
+    allow, cfg, cfg_attr, deny, expect, forbid, and warn are the only allowed built-in attributes in function parameters
+
+ast_passes_fn_param_forbidden_self =
+    `self` parameter is only allowed in associated functions
+    .label = not semantically valid as function parameter
+    .note = associated functions are those in `impl` or `trait` definitions
+
+ast_passes_forbidden_default =
+    `default` is only allowed on items in trait impls
+    .label = `default` because of this
+
+ast_passes_assoc_const_without_body =
+    associated constant in `impl` without body
+    .suggestion = provide a definition for the constant
+
+ast_passes_assoc_fn_without_body =
+    associated function in `impl` without body
+    .suggestion = provide a definition for the function
+
+ast_passes_assoc_type_without_body =
+    associated type in `impl` without body
+    .suggestion = provide a definition for the type
+
+ast_passes_const_without_body =
+    free constant item without body
+    .suggestion = provide a definition for the constant
+
+ast_passes_static_without_body =
+    free static item without body
+    .suggestion = provide a definition for the static
+
+ast_passes_ty_alias_without_body =
+    free type alias without body
+    .suggestion = provide a definition for the type
+
+ast_passes_fn_without_body =
+    free function without a body
+    .suggestion = provide a definition for the function
+
+ast_passes_extern_block_suggestion = if you meant to declare an externally defined function, use an `extern` block
diff --git a/compiler/rustc_ast_passes/src/ast_validation.rs b/compiler/rustc_ast_passes/src/ast_validation.rs
index afa29a510d2..56977e45a1a 100644
--- a/compiler/rustc_ast_passes/src/ast_validation.rs
+++ b/compiler/rustc_ast_passes/src/ast_validation.rs
@@ -13,7 +13,7 @@ use rustc_ast::walk_list;
 use rustc_ast::*;
 use rustc_ast_pretty::pprust::{self, State};
 use rustc_data_structures::fx::FxHashMap;
-use rustc_errors::{error_code, fluent, pluralize, struct_span_err, Applicability};
+use rustc_errors::{error_code, pluralize, struct_span_err, Applicability};
 use rustc_macros::Subdiagnostic;
 use rustc_parse::validate_attr;
 use rustc_session::lint::builtin::{
@@ -30,6 +30,7 @@ use std::ops::{Deref, DerefMut};
 use thin_vec::thin_vec;
 
 use crate::errors::*;
+use crate::fluent_generated as fluent;
 
 const MORE_EXTERN: &str =
     "for more information, visit https://doc.rust-lang.org/std/keyword.extern.html";
@@ -1723,12 +1724,12 @@ pub(crate) enum ForbiddenLetReason {
     /// `let` is not valid and the source environment is not important
     GenericForbidden,
     /// A let chain with the `||` operator
-    #[note(not_supported_or)]
+    #[note(ast_passes_not_supported_or)]
     NotSupportedOr(#[primary_span] Span),
     /// A let chain with invalid parentheses
     ///
     /// For example, `let 1 = 1 && (expr && expr)` is allowed
     /// but `(let 1 = 1 && (let 1 = 1 && (let 1 = 1))) && let a = 1` is not
-    #[note(not_supported_parentheses)]
+    #[note(ast_passes_not_supported_parentheses)]
     NotSupportedParentheses(#[primary_span] Span),
 }
diff --git a/compiler/rustc_ast_passes/src/errors.rs b/compiler/rustc_ast_passes/src/errors.rs
index 09e262452b1..69ce8daa455 100644
--- a/compiler/rustc_ast_passes/src/errors.rs
+++ b/compiler/rustc_ast_passes/src/errors.rs
@@ -50,7 +50,7 @@ pub struct InvalidLabel {
 pub struct InvalidVisibility {
     #[primary_span]
     pub span: Span,
-    #[label(implied)]
+    #[label(ast_passes_implied)]
     pub implied: Option<Span>,
     #[subdiagnostic]
     pub note: Option<InvalidVisibilityNote>,
@@ -58,9 +58,9 @@ pub struct InvalidVisibility {
 
 #[derive(Subdiagnostic)]
 pub enum InvalidVisibilityNote {
-    #[note(individual_impl_items)]
+    #[note(ast_passes_individual_impl_items)]
     IndividualImplItems,
-    #[note(individual_foreign_items)]
+    #[note(ast_passes_individual_foreign_items)]
     IndividualForeignItems,
 }
 
diff --git a/compiler/rustc_ast_passes/src/feature_gate.rs b/compiler/rustc_ast_passes/src/feature_gate.rs
index 6f7ba7a5ad7..d69c84bf4d1 100644
--- a/compiler/rustc_ast_passes/src/feature_gate.rs
+++ b/compiler/rustc_ast_passes/src/feature_gate.rs
@@ -157,7 +157,7 @@ impl<'a> PostExpansionVisitor<'a> {
                 &self.sess.parse_sess,
                 sym::non_lifetime_binders,
                 non_lt_param_spans,
-                rustc_errors::fluent::ast_passes_forbidden_non_lifetime_param,
+                crate::fluent_generated::ast_passes_forbidden_non_lifetime_param,
             )
             .emit();
         }
diff --git a/compiler/rustc_ast_passes/src/lib.rs b/compiler/rustc_ast_passes/src/lib.rs
index bbcbecd8131..1be959b0de6 100644
--- a/compiler/rustc_ast_passes/src/lib.rs
+++ b/compiler/rustc_ast_passes/src/lib.rs
@@ -11,8 +11,13 @@
 #![feature(let_chains)]
 #![recursion_limit = "256"]
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
 pub mod ast_validation;
 mod errors;
 pub mod feature_gate;
 pub mod node_count;
 pub mod show_span;
+
+fluent_messages! { "../locales/en-US.ftl" }
diff --git a/compiler/rustc_attr/locales/en-US.ftl b/compiler/rustc_attr/locales/en-US.ftl
new file mode 100644
index 00000000000..a7f8c993d42
--- /dev/null
+++ b/compiler/rustc_attr/locales/en-US.ftl
@@ -0,0 +1,107 @@
+attr_expected_one_cfg_pattern =
+    expected 1 cfg-pattern
+
+attr_invalid_predicate =
+    invalid predicate `{$predicate}`
+
+attr_multiple_item =
+    multiple '{$item}' items
+
+attr_incorrect_meta_item =
+    incorrect meta item
+
+attr_unknown_meta_item =
+    unknown meta item '{$item}'
+    .label = expected one of {$expected}
+
+attr_missing_since =
+    missing 'since'
+
+attr_missing_note =
+    missing 'note'
+
+attr_multiple_stability_levels =
+    multiple stability levels
+
+attr_invalid_issue_string =
+    `issue` must be a non-zero numeric string or "none"
+    .must_not_be_zero = `issue` must not be "0", use "none" instead
+    .empty = cannot parse integer from empty string
+    .invalid_digit = invalid digit found in string
+    .pos_overflow = number too large to fit in target type
+    .neg_overflow = number too small to fit in target type
+
+attr_missing_feature =
+    missing 'feature'
+
+attr_non_ident_feature =
+    'feature' is not an identifier
+
+attr_missing_issue =
+    missing 'issue'
+
+attr_incorrect_repr_format_packed_one_or_zero_arg =
+    incorrect `repr(packed)` attribute format: `packed` takes exactly one parenthesized argument, or no parentheses at all
+
+attr_invalid_repr_hint_no_paren =
+    invalid representation hint: `{$name}` does not take a parenthesized argument list
+
+attr_invalid_repr_hint_no_value =
+    invalid representation hint: `{$name}` does not take a value
+
+attr_unsupported_literal_generic =
+    unsupported literal
+attr_unsupported_literal_cfg_string =
+    literal in `cfg` predicate value must be a string
+attr_unsupported_literal_deprecated_string =
+    literal in `deprecated` value must be a string
+attr_unsupported_literal_deprecated_kv_pair =
+    item in `deprecated` must be a key/value pair
+attr_unsupported_literal_suggestion =
+    consider removing the prefix
+
+attr_invalid_repr_align_need_arg =
+    invalid `repr(align)` attribute: `align` needs an argument
+    .suggestion = supply an argument here
+
+attr_invalid_repr_generic =
+    invalid `repr({$repr_arg})` attribute: {$error_part}
+
+attr_incorrect_repr_format_align_one_arg =
+    incorrect `repr(align)` attribute format: `align` takes exactly one argument in parentheses
+
+attr_incorrect_repr_format_generic =
+    incorrect `repr({$repr_arg})` attribute format
+    .suggestion = use parentheses instead
+
+attr_rustc_promotable_pairing =
+    `rustc_promotable` attribute must be paired with either a `rustc_const_unstable` or a `rustc_const_stable` attribute
+
+attr_rustc_allowed_unstable_pairing =
+    `rustc_allowed_through_unstable_modules` attribute must be paired with a `stable` attribute
+
+attr_cfg_predicate_identifier =
+    `cfg` predicate key must be an identifier
+
+attr_deprecated_item_suggestion =
+    suggestions on deprecated items are unstable
+    .help = add `#![feature(deprecated_suggestion)]` to the crate root
+    .note = see #94785 for more details
+
+attr_expected_single_version_literal =
+    expected single version literal
+
+attr_expected_version_literal =
+    expected a version literal
+
+attr_expects_feature_list =
+    `{$name}` expects a list of feature names
+
+attr_expects_features =
+    `{$name}` expects feature names
+
+attr_soft_no_args =
+    `soft` should not have any arguments
+
+attr_unknown_version_literal =
+    unknown version literal format, assuming it refers to a future version
diff --git a/compiler/rustc_attr/src/lib.rs b/compiler/rustc_attr/src/lib.rs
index 4580ffcc6d8..5fede0a58ac 100644
--- a/compiler/rustc_attr/src/lib.rs
+++ b/compiler/rustc_attr/src/lib.rs
@@ -11,6 +11,9 @@
 #[macro_use]
 extern crate rustc_macros;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
 mod builtin;
 mod session_diagnostics;
 
@@ -22,3 +25,5 @@ pub use StabilityLevel::*;
 pub use rustc_ast::attr::*;
 
 pub(crate) use rustc_ast::HashStableContext;
+
+fluent_messages! { "../locales/en-US.ftl" }
diff --git a/compiler/rustc_attr/src/session_diagnostics.rs b/compiler/rustc_attr/src/session_diagnostics.rs
index 3ba7a3c5336..ee79545e304 100644
--- a/compiler/rustc_attr/src/session_diagnostics.rs
+++ b/compiler/rustc_attr/src/session_diagnostics.rs
@@ -2,11 +2,12 @@ use std::num::IntErrorKind;
 
 use rustc_ast as ast;
 use rustc_errors::{
-    error_code, fluent, Applicability, DiagnosticBuilder, ErrorGuaranteed, Handler, IntoDiagnostic,
+    error_code, Applicability, DiagnosticBuilder, ErrorGuaranteed, Handler, IntoDiagnostic,
 };
 use rustc_macros::Diagnostic;
 use rustc_span::{Span, Symbol};
 
+use crate::fluent_generated as fluent;
 use crate::UnsupportedLiteralReason;
 
 #[derive(Diagnostic)]
@@ -59,7 +60,7 @@ impl<'a> IntoDiagnostic<'a> for UnknownMetaItem<'_> {
         );
         diag.set_arg("item", self.item);
         diag.set_arg("expected", expected.join(", "));
-        diag.span_label(self.span, fluent::label);
+        diag.span_label(self.span, fluent::attr_label);
         diag
     }
 }
@@ -99,31 +100,31 @@ pub(crate) struct InvalidIssueString {
 // translatable.
 #[derive(Subdiagnostic)]
 pub(crate) enum InvalidIssueStringCause {
-    #[label(must_not_be_zero)]
+    #[label(attr_must_not_be_zero)]
     MustNotBeZero {
         #[primary_span]
         span: Span,
     },
 
-    #[label(empty)]
+    #[label(attr_empty)]
     Empty {
         #[primary_span]
         span: Span,
     },
 
-    #[label(invalid_digit)]
+    #[label(attr_invalid_digit)]
     InvalidDigit {
         #[primary_span]
         span: Span,
     },
 
-    #[label(pos_overflow)]
+    #[label(attr_pos_overflow)]
     PosOverflow {
         #[primary_span]
         span: Span,
     },
 
-    #[label(neg_overflow)]
+    #[label(attr_neg_overflow)]
     NegOverflow {
         #[primary_span]
         span: Span,
@@ -275,7 +276,7 @@ pub(crate) struct IncorrectReprFormatGeneric<'a> {
 
 #[derive(Subdiagnostic)]
 pub(crate) enum IncorrectReprFormatGenericCause<'a> {
-    #[suggestion(suggestion, code = "{name}({int})", applicability = "machine-applicable")]
+    #[suggestion(attr_suggestion, code = "{name}({int})", applicability = "machine-applicable")]
     Int {
         #[primary_span]
         span: Span,
@@ -287,7 +288,7 @@ pub(crate) enum IncorrectReprFormatGenericCause<'a> {
         int: u128,
     },
 
-    #[suggestion(suggestion, code = "{name}({symbol})", applicability = "machine-applicable")]
+    #[suggestion(attr_suggestion, code = "{name}({symbol})", applicability = "machine-applicable")]
     Symbol {
         #[primary_span]
         span: Span,
diff --git a/compiler/rustc_borrowck/locales/en-US.ftl b/compiler/rustc_borrowck/locales/en-US.ftl
new file mode 100644
index 00000000000..a3b6b5e8138
--- /dev/null
+++ b/compiler/rustc_borrowck/locales/en-US.ftl
@@ -0,0 +1,129 @@
+borrowck_move_unsized =
+    cannot move a value of type `{$ty}`
+    .label = the size of `{$ty}` cannot be statically determined
+
+borrowck_higher_ranked_lifetime_error =
+    higher-ranked lifetime error
+
+borrowck_could_not_prove =
+    could not prove `{$predicate}`
+
+borrowck_could_not_normalize =
+    could not normalize `{$value}`
+
+borrowck_higher_ranked_subtype_error =
+    higher-ranked subtype error
+
+borrowck_generic_does_not_live_long_enough =
+    `{$kind}` does not live long enough
+
+borrowck_move_borrowed =
+    cannot move out of `{$desc}` because it is borrowed
+
+borrowck_var_does_not_need_mut =
+    variable does not need to be mutable
+    .suggestion = remove this `mut`
+
+borrowck_var_cannot_escape_closure =
+    captured variable cannot escape `FnMut` closure body
+    .note = `FnMut` closures only have access to their captured variables while they are executing...
+    .cannot_escape = ...therefore, they cannot allow references to captured variables to escape
+
+borrowck_var_here_defined = variable defined here
+
+borrowck_var_here_captured = variable captured here
+
+borrowck_closure_inferred_mut = inferred to be a `FnMut` closure
+
+borrowck_returned_closure_escaped =
+    returns a closure that contains a reference to a captured variable, which then escapes the closure body
+
+borrowck_returned_async_block_escaped =
+    returns an `async` block that contains a reference to a captured variable, which then escapes the closure body
+
+borrowck_returned_ref_escaped =
+    returns a reference to a captured variable which escapes the closure body
+
+borrowck_lifetime_constraints_error =
+    lifetime may not live long enough
+
+borrowck_returned_lifetime_wrong =
+    {$mir_def_name} was supposed to return data with lifetime `{$outlived_fr_name}` but it is returning data with lifetime `{$fr_name}`
+
+borrowck_returned_lifetime_short =
+    {$category_desc}requires that `{$free_region_name}` must outlive `{$outlived_fr_name}`
+
+borrowck_used_impl_require_static =
+    the used `impl` has a `'static` requirement
+
+borrowck_capture_kind_label =
+    capture is {$kind_desc} because of use here
+
+borrowck_var_borrow_by_use_place_in_generator =
+    borrow occurs due to use of {$place} in closure in generator
+
+borrowck_var_borrow_by_use_place_in_closure =
+    borrow occurs due to use of {$place} in closure
+
+borrowck_var_borrow_by_use_place =
+    borrow occurs due to use of {$place}
+
+borrowck_borrow_due_to_use_generator =
+    borrow occurs due to use in generator
+
+borrowck_use_due_to_use_generator =
+    use occurs due to use in generator
+
+borrowck_assign_due_to_use_generator =
+    assign occurs due to use in generator
+
+borrowck_assign_part_due_to_use_generator =
+    assign to part occurs due to use in generator
+
+borrowck_borrow_due_to_use_closure =
+    borrow occurs due to use in closure
+
+borrowck_use_due_to_use_closure =
+    use occurs due to use in closure
+
+borrowck_assign_due_to_use_closure =
+    assignment occurs due to use in closure
+
+borrowck_assign_part_due_to_use_closure =
+    assignment to part occurs due to use in closure
+
+borrowck_capture_immute =
+    capture is immutable because of use here
+
+borrowck_capture_mut =
+    capture is mutable because of use here
+
+borrowck_capture_move =
+    capture is moved because of use here
+
+borrowck_var_move_by_use_place_in_generator =
+    move occurs due to use of {$place} in generator
+
+borrowck_var_move_by_use_place_in_closure =
+    move occurs due to use of {$place} in closure
+
+borrowck_cannot_move_when_borrowed =
+    cannot move out of {$place ->
+        [value] value
+        *[other] {$place}
+    } because it is borrowed
+    .label = borrow of {$borrow_place ->
+        [value] value
+        *[other] {$borrow_place}
+    } occurs here
+    .move_label = move out of {$value_place ->
+        [value] value
+        *[other] {$value_place}
+    } occurs here
+
+borrowck_opaque_type_non_generic_param =
+    expected generic {$kind} parameter, found `{$ty}`
+    .label = {STREQ($ty, "'static") ->
+        [true] cannot use static lifetime; use a bound lifetime instead or remove the lifetime parameter from the opaque type
+        *[other] this generic parameter must be used with a generic {$kind} parameter
+    }
diff --git a/compiler/rustc_borrowck/src/lib.rs b/compiler/rustc_borrowck/src/lib.rs
index 622b57c7b7f..42949143431 100644
--- a/compiler/rustc_borrowck/src/lib.rs
+++ b/compiler/rustc_borrowck/src/lib.rs
@@ -20,7 +20,7 @@ extern crate tracing;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::graph::dominators::Dominators;
 use rustc_data_structures::vec_map::VecMap;
-use rustc_errors::{Diagnostic, DiagnosticBuilder};
+use rustc_errors::{Diagnostic, DiagnosticBuilder, DiagnosticMessage, SubdiagnosticMessage};
 use rustc_hir as hir;
 use rustc_hir::def_id::LocalDefId;
 use rustc_index::bit_set::ChunkedBitSet;
@@ -28,6 +28,7 @@ use rustc_index::vec::IndexVec;
 use rustc_infer::infer::{
     DefiningAnchor, InferCtxt, NllRegionVariableOrigin, RegionVariableOrigin, TyCtxtInferExt,
 };
+use rustc_macros::fluent_messages;
 use rustc_middle::mir::{
     traversal, Body, ClearCrossCrate, Local, Location, Mutability, NonDivergingIntrinsic, Operand,
     Place, PlaceElem, PlaceRef, VarDebugInfoContents,
@@ -99,6 +100,8 @@ use places_conflict::{places_conflict, PlaceConflictBias};
 use region_infer::RegionInferenceContext;
 use renumber::RegionCtxt;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 // FIXME(eddyb) perhaps move this somewhere more centrally.
 #[derive(Debug)]
 struct Upvar<'tcx> {
diff --git a/compiler/rustc_borrowck/src/session_diagnostics.rs b/compiler/rustc_borrowck/src/session_diagnostics.rs
index 13199d03852..a3678929099 100644
--- a/compiler/rustc_borrowck/src/session_diagnostics.rs
+++ b/compiler/rustc_borrowck/src/session_diagnostics.rs
@@ -55,7 +55,7 @@ pub(crate) struct VarNeedNotMut {
 #[derive(Diagnostic)]
 #[diag(borrowck_var_cannot_escape_closure)]
 #[note]
-#[note(cannot_escape)]
+#[note(borrowck_cannot_escape)]
 pub(crate) struct FnMutError {
     #[primary_span]
     pub span: Span,
@@ -223,7 +223,7 @@ pub(crate) struct MoveBorrow<'a> {
     pub borrow_place: &'a str,
     pub value_place: &'a str,
     #[primary_span]
-    #[label(move_label)]
+    #[label(borrowck_move_label)]
     pub span: Span,
     #[label]
     pub borrow_span: Span,
diff --git a/compiler/rustc_builtin_macros/locales/en-US.ftl b/compiler/rustc_builtin_macros/locales/en-US.ftl
new file mode 100644
index 00000000000..4d088e27b36
--- /dev/null
+++ b/compiler/rustc_builtin_macros/locales/en-US.ftl
@@ -0,0 +1,5 @@
+builtin_macros_requires_cfg_pattern =
+    macro requires a cfg-pattern as an argument
+    .label = cfg-pattern required
+
+builtin_macros_expected_one_cfg_pattern = expected 1 cfg-pattern
diff --git a/compiler/rustc_builtin_macros/src/lib.rs b/compiler/rustc_builtin_macros/src/lib.rs
index 75cfac72384..8afb6e56069 100644
--- a/compiler/rustc_builtin_macros/src/lib.rs
+++ b/compiler/rustc_builtin_macros/src/lib.rs
@@ -21,8 +21,10 @@ extern crate tracing;
 
 use crate::deriving::*;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_expand::base::{MacroExpanderFn, ResolverExpand, SyntaxExtensionKind};
 use rustc_expand::proc_macro::BangProcMacro;
+use rustc_macros::fluent_messages;
 use rustc_span::symbol::sym;
 
 mod alloc_error_handler;
@@ -54,6 +56,8 @@ pub mod proc_macro_harness;
 pub mod standard_library_imports;
 pub mod test_harness;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 pub fn register_builtin_macros(resolver: &mut dyn ResolverExpand) {
     let mut register = |name, kind| resolver.register_builtin_macro(name, kind);
     macro register_bang($($name:ident: $f:expr,)*) {
diff --git a/compiler/rustc_codegen_gcc/locales/en-US.ftl b/compiler/rustc_codegen_gcc/locales/en-US.ftl
new file mode 100644
index 00000000000..6101b28ab0c
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/locales/en-US.ftl
@@ -0,0 +1,62 @@
+codegen_gcc_unwinding_inline_asm =
+    GCC backend does not support unwinding from inline asm
+
+codegen_gcc_lto_not_supported =
+    LTO is not supported. You may get a linker error.
+
+codegen_gcc_invalid_monomorphization_basic_integer =
+    invalid monomorphization of `{$name}` intrinsic: expected basic integer type, found `{$ty}`
+
+codegen_gcc_invalid_monomorphization_invalid_float_vector =
+    invalid monomorphization of `{$name}` intrinsic: unsupported element type `{$elem_ty}` of floating-point vector `{$vec_ty}`
+
+codegen_gcc_invalid_monomorphization_not_float =
+    invalid monomorphization of `{$name}` intrinsic: `{$ty}` is not a floating-point type
+
+codegen_gcc_invalid_monomorphization_unrecognized =
+    invalid monomorphization of `{$name}` intrinsic: unrecognized intrinsic `{$name}`
+
+codegen_gcc_invalid_monomorphization_expected_signed_unsigned =
+    invalid monomorphization of `{$name}` intrinsic: expected element type `{$elem_ty}` of vector type `{$vec_ty}` to be a signed or unsigned integer type
+
+codegen_gcc_invalid_monomorphization_unsupported_element =
+    invalid monomorphization of `{$name}` intrinsic: unsupported {$name} from `{$in_ty}` with element `{$elem_ty}` to `{$ret_ty}`
+
+codegen_gcc_invalid_monomorphization_invalid_bitmask =
+    invalid monomorphization of `{$name}` intrinsic: invalid bitmask `{$ty}`, expected `u{$expected_int_bits}` or `[u8; {$expected_bytes}]`
+
+codegen_gcc_invalid_monomorphization_simd_shuffle =
+    invalid monomorphization of `{$name}` intrinsic: simd_shuffle index must be an array of `u32`, got `{$ty}`
+
+codegen_gcc_invalid_monomorphization_expected_simd =
+    invalid monomorphization of `{$name}` intrinsic: expected SIMD {$expected_ty} type, found non-SIMD `{$found_ty}`
+
+codegen_gcc_invalid_monomorphization_mask_type =
+    invalid monomorphization of `{$name}` intrinsic: mask element type is `{$ty}`, expected `i_`
+
+codegen_gcc_invalid_monomorphization_return_length =
+    invalid monomorphization of `{$name}` intrinsic: expected return type of length {$in_len}, found `{$ret_ty}` with length {$out_len}
+
+codegen_gcc_invalid_monomorphization_return_length_input_type =
+    invalid monomorphization of `{$name}` intrinsic: expected return type with length {$in_len} (same as input type `{$in_ty}`), found `{$ret_ty}` with length {$out_len}
+
+codegen_gcc_invalid_monomorphization_return_element =
+    invalid monomorphization of `{$name}` intrinsic: expected return element type `{$in_elem}` (element of input `{$in_ty}`), found `{$ret_ty}` with element type `{$out_ty}`
+
+codegen_gcc_invalid_monomorphization_return_type =
+    invalid monomorphization of `{$name}` intrinsic: expected return type `{$in_elem}` (element of input `{$in_ty}`), found `{$ret_ty}`
+
+codegen_gcc_invalid_monomorphization_inserted_type =
+    invalid monomorphization of `{$name}` intrinsic: expected inserted type `{$in_elem}` (element of input `{$in_ty}`), found `{$out_ty}`
+
+codegen_gcc_invalid_monomorphization_return_integer_type =
+    invalid monomorphization of `{$name}` intrinsic: expected return type with integer elements, found `{$ret_ty}` with non-integer `{$out_ty}`
+
+codegen_gcc_invalid_monomorphization_mismatched_lengths =
+    invalid monomorphization of `{$name}` intrinsic: mismatched lengths: mask length `{$m_len}` != other vector length `{$v_len}`
+
+codegen_gcc_invalid_monomorphization_unsupported_cast =
+    invalid monomorphization of `{$name}` intrinsic: unsupported cast from `{$in_ty}` with element `{$in_elem}` to `{$ret_ty}` with element `{$out_elem}`
+
+codegen_gcc_invalid_monomorphization_unsupported_operation =
+    invalid monomorphization of `{$name}` intrinsic: unsupported operation on `{$in_ty}` with element `{$in_elem}`
diff --git a/compiler/rustc_codegen_gcc/src/lib.rs b/compiler/rustc_codegen_gcc/src/lib.rs
index 5ab87feb98b..546c892aae5 100644
--- a/compiler/rustc_codegen_gcc/src/lib.rs
+++ b/compiler/rustc_codegen_gcc/src/lib.rs
@@ -73,7 +73,8 @@ use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModul
 use rustc_codegen_ssa::target_features::supported_target_features;
 use rustc_codegen_ssa::traits::{CodegenBackend, ExtraBackendMethods, ModuleBufferMethods, ThinBufferMethods, WriteBackendMethods};
 use rustc_data_structures::fx::FxHashMap;
-use rustc_errors::{ErrorGuaranteed, Handler};
+use rustc_errors::{DiagnosticMessage, ErrorGuaranteed, Handler, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
 use rustc_metadata::EncodedMetadata;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
 use rustc_middle::ty::TyCtxt;
@@ -84,6 +85,8 @@ use rustc_span::Symbol;
 use rustc_span::fatal_error::FatalError;
 use tempfile::TempDir;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 pub struct PrintOnPanic<F: Fn() -> String>(pub F);
 
 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
diff --git a/compiler/rustc_codegen_llvm/locales/en-US.ftl b/compiler/rustc_codegen_llvm/locales/en-US.ftl
new file mode 100644
index 00000000000..e5df417370b
--- /dev/null
+++ b/compiler/rustc_codegen_llvm/locales/en-US.ftl
@@ -0,0 +1,89 @@
+codegen_llvm_unknown_ctarget_feature =
+    unknown feature specified for `-Ctarget-feature`: `{$feature}`
+    .note = it is still passed through to the codegen backend
+    .possible_feature = you might have meant: `{$rust_feature}`
+    .consider_filing_feature_request = consider filing a feature request
+
+codegen_llvm_unknown_ctarget_feature_prefix =
+    unknown feature specified for `-Ctarget-feature`: `{$feature}`
+    .note = features must begin with a `+` to enable or `-` to disable it
+
+codegen_llvm_error_creating_import_library =
+    Error creating import library for {$lib_name}: {$error}
+
+codegen_llvm_symbol_already_defined =
+    symbol `{$symbol_name}` is already defined
+
+codegen_llvm_invalid_minimum_alignment =
+    invalid minimum global alignment: {$err}
+
+codegen_llvm_sanitizer_memtag_requires_mte =
+    `-Zsanitizer=memtag` requires `-Ctarget-feature=+mte`
+
+codegen_llvm_error_writing_def_file =
+    Error writing .DEF file: {$error}
+
+codegen_llvm_error_calling_dlltool =
+    Error calling dlltool: {$error}
+
+codegen_llvm_dlltool_fail_import_library =
+    Dlltool could not create import library: {$stdout}\n{$stderr}
+
+codegen_llvm_target_feature_disable_or_enable =
+    the target features {$features} must all be either enabled or disabled together
+
+codegen_llvm_missing_features =
+    add the missing features in a `target_feature` attribute
+
+codegen_llvm_dynamic_linking_with_lto =
+    cannot prefer dynamic linking when performing LTO
+    .note = only 'staticlib', 'bin', and 'cdylib' outputs are supported with LTO
+
+codegen_llvm_parse_target_machine_config =
+    failed to parse target machine config to target machine: {$error}
+
+codegen_llvm_lto_disallowed = lto can only be run for executables, cdylibs and static library outputs
+
+codegen_llvm_lto_dylib = lto cannot be used for `dylib` crate type without `-Zdylib-lto`
+
+codegen_llvm_lto_bitcode_from_rlib = failed to get bitcode from object file for LTO ({$llvm_err})
+
+codegen_llvm_write_output = could not write output to {$path}
+codegen_llvm_write_output_with_llvm_err = could not write output to {$path}: {$llvm_err}
+
+codegen_llvm_target_machine = could not create LLVM TargetMachine for triple: {$triple}
+codegen_llvm_target_machine_with_llvm_err = could not create LLVM TargetMachine for triple: {$triple}: {$llvm_err}
+
+codegen_llvm_run_passes = failed to run LLVM passes
+codegen_llvm_run_passes_with_llvm_err = failed to run LLVM passes: {$llvm_err}
+
+codegen_llvm_serialize_module = failed to serialize module {$name}
+codegen_llvm_serialize_module_with_llvm_err = failed to serialize module {$name}: {$llvm_err}
+
+codegen_llvm_write_ir = failed to write LLVM IR to {$path}
+codegen_llvm_write_ir_with_llvm_err = failed to write LLVM IR to {$path}: {$llvm_err}
+
+codegen_llvm_prepare_thin_lto_context = failed to prepare thin LTO context
+codegen_llvm_prepare_thin_lto_context_with_llvm_err = failed to prepare thin LTO context: {$llvm_err}
+
+codegen_llvm_load_bitcode = failed to load bitcode of module "{$name}"
+codegen_llvm_load_bitcode_with_llvm_err = failed to load bitcode of module "{$name}": {$llvm_err}
+
+codegen_llvm_write_thinlto_key = error while writing ThinLTO key data: {$err}
+codegen_llvm_write_thinlto_key_with_llvm_err = error while writing ThinLTO key data: {$err}: {$llvm_err}
+
+codegen_llvm_multiple_source_dicompileunit = multiple source DICompileUnits found
+codegen_llvm_multiple_source_dicompileunit_with_llvm_err = multiple source DICompileUnits found: {$llvm_err}
+
+codegen_llvm_prepare_thin_lto_module = failed to prepare thin LTO module
+codegen_llvm_prepare_thin_lto_module_with_llvm_err = failed to prepare thin LTO module: {$llvm_err}
+
+codegen_llvm_parse_bitcode = failed to parse bitcode for LTO module
+codegen_llvm_parse_bitcode_with_llvm_err = failed to parse bitcode for LTO module: {$llvm_err}
+
+codegen_llvm_from_llvm_optimization_diag = {$filename}:{$line}:{$column} {$pass_name}: {$message}
+codegen_llvm_from_llvm_diag = {$message}
+
+codegen_llvm_write_bytecode = failed to write bytecode to {$path}: {$err}
+
+codegen_llvm_copy_bitcode = failed to copy bitcode to object file: {$err}
diff --git a/compiler/rustc_codegen_llvm/src/errors.rs b/compiler/rustc_codegen_llvm/src/errors.rs
index 81072edc475..bae88d94293 100644
--- a/compiler/rustc_codegen_llvm/src/errors.rs
+++ b/compiler/rustc_codegen_llvm/src/errors.rs
@@ -2,9 +2,10 @@ use std::borrow::Cow;
 use std::ffi::CString;
 use std::path::Path;
 
+use crate::fluent_generated as fluent;
 use rustc_data_structures::small_c_str::SmallCStr;
 use rustc_errors::{
-    fluent, DiagnosticBuilder, EmissionGuarantee, ErrorGuaranteed, Handler, IntoDiagnostic,
+    DiagnosticBuilder, EmissionGuarantee, ErrorGuaranteed, Handler, IntoDiagnostic,
 };
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::Span;
@@ -27,9 +28,9 @@ pub(crate) struct UnknownCTargetFeature<'a> {
 
 #[derive(Subdiagnostic)]
 pub(crate) enum PossibleFeature<'a> {
-    #[help(possible_feature)]
+    #[help(codegen_llvm_possible_feature)]
     Some { rust_feature: &'a str },
-    #[help(consider_filing_feature_request)]
+    #[help(codegen_llvm_consider_filing_feature_request)]
     None,
 }
 
diff --git a/compiler/rustc_codegen_llvm/src/lib.rs b/compiler/rustc_codegen_llvm/src/lib.rs
index 111d14b265c..de886c881a5 100644
--- a/compiler/rustc_codegen_llvm/src/lib.rs
+++ b/compiler/rustc_codegen_llvm/src/lib.rs
@@ -34,7 +34,8 @@ use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::ModuleCodegen;
 use rustc_codegen_ssa::{CodegenResults, CompiledModule};
 use rustc_data_structures::fx::FxHashMap;
-use rustc_errors::{ErrorGuaranteed, FatalError, Handler};
+use rustc_errors::{DiagnosticMessage, ErrorGuaranteed, FatalError, Handler, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
 use rustc_metadata::EncodedMetadata;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
 use rustc_middle::ty::query::Providers;
@@ -83,6 +84,8 @@ mod type_of;
 mod va_arg;
 mod value;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 #[derive(Clone)]
 pub struct LlvmCodegenBackend(());
 
diff --git a/compiler/rustc_codegen_ssa/locales/en-US.ftl b/compiler/rustc_codegen_ssa/locales/en-US.ftl
new file mode 100644
index 00000000000..8fe5f8d50ab
--- /dev/null
+++ b/compiler/rustc_codegen_ssa/locales/en-US.ftl
@@ -0,0 +1,293 @@
+codegen_ssa_lib_def_write_failure = failed to write lib.def file: {$error}
+
+codegen_ssa_version_script_write_failure = failed to write version script: {$error}
+
+codegen_ssa_symbol_file_write_failure = failed to write symbols file: {$error}
+
+codegen_ssa_ld64_unimplemented_modifier = `as-needed` modifier not implemented yet for ld64
+
+codegen_ssa_linker_unsupported_modifier = `as-needed` modifier not supported for current linker
+
+codegen_ssa_L4Bender_exporting_symbols_unimplemented = exporting symbols not implemented yet for L4Bender
+
+codegen_ssa_no_natvis_directory = error enumerating natvis directory: {$error}
+
+codegen_ssa_copy_path = could not copy {$from} to {$to}: {$error}
+
+codegen_ssa_copy_path_buf = unable to copy {$source_file} to {$output_path}: {$error}
+
+codegen_ssa_ignoring_emit_path = ignoring emit path because multiple .{$extension} files were produced
+
+codegen_ssa_ignoring_output = ignoring -o because multiple .{$extension} files were produced
+
+codegen_ssa_create_temp_dir = couldn't create a temp dir: {$error}
+
+codegen_ssa_incompatible_linking_modifiers = link modifiers combination `+bundle,+whole-archive` is unstable when generating rlibs
+
+codegen_ssa_add_native_library = failed to add native library {$library_path}: {$error}
+
+codegen_ssa_multiple_external_func_decl = multiple declarations of external function `{$function}` from library `{$library_name}` have different calling conventions
+
+codegen_ssa_rlib_missing_format = could not find formats for rlibs
+
+codegen_ssa_rlib_only_rmeta_found = could not find rlib for: `{$crate_name}`, found rmeta (metadata) file
+
+codegen_ssa_rlib_not_found = could not find rlib for: `{$crate_name}`
+
+codegen_ssa_rlib_incompatible_dependency_formats = `{$ty1}` and `{$ty2}` do not have equivalent dependency formats (`{$list1}` vs `{$list2}`)
+
+codegen_ssa_linking_failed = linking with `{$linker_path}` failed: {$exit_status}
+
+codegen_ssa_extern_funcs_not_found = some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
+
+codegen_ssa_specify_libraries_to_link = use the `-l` flag to specify native libraries to link
+
+codegen_ssa_use_cargo_directive = use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorustc-link-libkindname)
+
+codegen_ssa_thorin_read_input_failure = failed to read input file
+
+codegen_ssa_thorin_parse_input_file_kind = failed to parse input file kind
+
+codegen_ssa_thorin_parse_input_object_file = failed to parse input object file
+
+codegen_ssa_thorin_parse_input_archive_file = failed to parse input archive file
+
+codegen_ssa_thorin_parse_archive_member = failed to parse archive member
+
+codegen_ssa_thorin_invalid_input_kind = input is not an archive or elf object
+
+codegen_ssa_thorin_decompress_data = failed to decompress compressed section
+
+codegen_ssa_thorin_section_without_name = section without name at offset {$offset}
+
+codegen_ssa_thorin_relocation_with_invalid_symbol = relocation with invalid symbol for section `{$section}` at offset {$offset}
+
+codegen_ssa_thorin_multiple_relocations = multiple relocations for section `{$section}` at offset {$offset}
+
+codegen_ssa_thorin_unsupported_relocation = unsupported relocation for section {$section} at offset {$offset}
+
+codegen_ssa_thorin_missing_dwo_name = missing path attribute to DWARF object ({$id})
+
+codegen_ssa_thorin_no_compilation_units = input object has no compilation units
+
+codegen_ssa_thorin_no_die = no top-level debugging information entry in compilation/type unit
+
+codegen_ssa_thorin_top_level_die_not_unit = top-level debugging information entry is not a compilation/type unit
+
+codegen_ssa_thorin_missing_required_section = input object missing required section `{$section}`
+
+codegen_ssa_thorin_parse_unit_abbreviations = failed to parse unit abbreviations
+
+codegen_ssa_thorin_parse_unit_attribute = failed to parse unit attribute
+
+codegen_ssa_thorin_parse_unit_header = failed to parse unit header
+
+codegen_ssa_thorin_parse_unit = failed to parse unit
+
+codegen_ssa_thorin_incompatible_index_version = incompatible `{$section}` index version: found version {$actual}, expected version {$format}
+
+codegen_ssa_thorin_offset_at_index = read offset at index {$index} of `.debug_str_offsets.dwo` section
+
+codegen_ssa_thorin_str_at_offset = read string at offset {$offset} of `.debug_str.dwo` section
+
+codegen_ssa_thorin_parse_index = failed to parse `{$section}` index section
+
+codegen_ssa_thorin_unit_not_in_index = unit {$unit} from input package is not in its index
+
+codegen_ssa_thorin_row_not_in_index = row {$row} found in index's hash table not present in index
+
+codegen_ssa_thorin_section_not_in_row = section not found in unit's row in index
+
+codegen_ssa_thorin_empty_unit = unit {$unit} in input DWARF object with no data
+
+codegen_ssa_thorin_multiple_debug_info_section = multiple `.debug_info.dwo` sections
+
+codegen_ssa_thorin_multiple_debug_types_section = multiple `.debug_types.dwo` sections in a package
+
+codegen_ssa_thorin_not_split_unit = regular compilation unit in object (missing dwo identifier)
+
+codegen_ssa_thorin_duplicate_unit = duplicate split compilation unit ({$unit})
+
+codegen_ssa_thorin_missing_referenced_unit = unit {$unit} referenced by executable was not found
+
+codegen_ssa_thorin_not_output_object_created = no output object was created from inputs
+
+codegen_ssa_thorin_mixed_input_encodings = input objects haved mixed encodings
+
+codegen_ssa_thorin_io = {$error}
+codegen_ssa_thorin_object_read = {$error}
+codegen_ssa_thorin_object_write = {$error}
+codegen_ssa_thorin_gimli_read = {$error}
+codegen_ssa_thorin_gimli_write = {$error}
+
+codegen_ssa_link_exe_unexpected_error = `link.exe` returned an unexpected error
+
+codegen_ssa_repair_vs_build_tools = the Visual Studio build tools may need to be repaired using the Visual Studio installer
+
+codegen_ssa_missing_cpp_build_tool_component = or a necessary component may be missing from the "C++ build tools" workload
+
+codegen_ssa_select_cpp_build_tool_workload = in the Visual Studio installer, ensure the "C++ build tools" workload is selected
+
+codegen_ssa_visual_studio_not_installed = you may need to install Visual Studio build tools with the "C++ build tools" workload
+
+codegen_ssa_linker_not_found = linker `{$linker_path}` not found
+    .note = {$error}
+
+codegen_ssa_unable_to_exe_linker = could not exec the linker `{$linker_path}`
+    .note = {$error}
+    .command_note = {$command_formatted}
+
+codegen_ssa_msvc_missing_linker = the msvc targets depend on the msvc linker but `link.exe` was not found
+
+codegen_ssa_check_installed_visual_studio = please ensure that Visual Studio 2017 or later, or Build Tools for Visual Studio were installed with the Visual C++ option.
+
+codegen_ssa_unsufficient_vs_code_product = VS Code is a different product, and is not sufficient.
+
+codegen_ssa_processing_dymutil_failed = processing debug info with `dsymutil` failed: {$status}
+    .note = {$output}
+
+codegen_ssa_unable_to_run_dsymutil = unable to run `dsymutil`: {$error}
+
+codegen_ssa_stripping_debu_info_failed = stripping debug info with `{$util}` failed: {$status}
+    .note = {$output}
+
+codegen_ssa_unable_to_run = unable to run `{$util}`: {$error}
+
+codegen_ssa_linker_file_stem = couldn't extract file stem from specified linker
+
+codegen_ssa_static_library_native_artifacts = Link against the following native artifacts when linking against this static library. The order and any duplication can be significant on some platforms.
+
+codegen_ssa_link_script_unavailable = can only use link script when linking with GNU-like linker
+
+codegen_ssa_link_script_write_failure = failed to write link script to {$path}: {$error}
+
+codegen_ssa_failed_to_write = failed to write {$path}: {$error}
+
+codegen_ssa_unable_to_write_debugger_visualizer = Unable to write debugger visualizer file `{$path}`: {$error}
+
+codegen_ssa_rlib_archive_build_failure = failed to build archive from rlib: {$error}
+
+codegen_ssa_option_gcc_only = option `-Z gcc-ld` is used even though linker flavor is not gcc
+
+codegen_ssa_extract_bundled_libs_open_file = failed to open file '{$rlib}': {$error}
+codegen_ssa_extract_bundled_libs_mmap_file = failed to mmap file '{$rlib}': {$error}
+codegen_ssa_extract_bundled_libs_parse_archive = failed to parse archive '{$rlib}': {$error}
+codegen_ssa_extract_bundled_libs_read_entry = failed to read entry '{$rlib}': {$error}
+codegen_ssa_extract_bundled_libs_archive_member = failed to get data from archive member '{$rlib}': {$error}
+codegen_ssa_extract_bundled_libs_convert_name = failed to convert name '{$rlib}': {$error}
+codegen_ssa_extract_bundled_libs_write_file = failed to write file '{$rlib}': {$error}
+
+codegen_ssa_unsupported_arch = unsupported arch `{$arch}` for os `{$os}`
+
+codegen_ssa_apple_sdk_error_sdk_path = failed to get {$sdk_name} SDK path: {$error}
+
+codegen_ssa_read_file = failed to read file: {$message}
+
+codegen_ssa_unsupported_link_self_contained = option `-C link-self-contained` is not supported on this target
+
+codegen_ssa_archive_build_failure =
+    failed to build archive: {$error}
+
+codegen_ssa_unknown_archive_kind =
+    Don't know how to build archive of type: {$kind}
+
+codegen_ssa_expected_used_symbol = expected `used`, `used(compiler)` or `used(linker)`
+
+codegen_ssa_multiple_main_functions = entry symbol `main` declared multiple times
+    .help = did you use `#[no_mangle]` on `fn main`? Use `#[start]` instead
+
+codegen_ssa_metadata_object_file_write = error writing metadata object file: {$error}
+
+codegen_ssa_invalid_windows_subsystem = invalid windows subsystem `{$subsystem}`, only `windows` and `console` are allowed
+
+codegen_ssa_erroneous_constant = erroneous constant encountered
+
+codegen_ssa_shuffle_indices_evaluation = could not evaluate shuffle_indices at compile time
+
+codegen_ssa_missing_memory_ordering = Atomic intrinsic missing memory ordering
+
+codegen_ssa_unknown_atomic_ordering = unknown ordering in atomic intrinsic
+
+codegen_ssa_atomic_compare_exchange = Atomic compare-exchange intrinsic missing failure memory ordering
+
+codegen_ssa_unknown_atomic_operation = unknown atomic operation
+
+codegen_ssa_invalid_monomorphization_basic_integer_type = invalid monomorphization of `{$name}` intrinsic: expected basic integer type, found `{$ty}`
+
+codegen_ssa_invalid_monomorphization_basic_float_type = invalid monomorphization of `{$name}` intrinsic: expected basic float type, found `{$ty}`
+
+codegen_ssa_invalid_monomorphization_float_to_int_unchecked = invalid monomorphization of `float_to_int_unchecked` intrinsic: expected basic float type, found `{$ty}`
+
+codegen_ssa_invalid_monomorphization_floating_point_vector = invalid monomorphization of `{$name}` intrinsic: unsupported element type `{$f_ty}` of floating-point vector `{$in_ty}`
+
+codegen_ssa_invalid_monomorphization_floating_point_type = invalid monomorphization of `{$name}` intrinsic: `{$in_ty}` is not a floating-point type
+
+codegen_ssa_invalid_monomorphization_unrecognized_intrinsic = invalid monomorphization of `{$name}` intrinsic: unrecognized intrinsic `{$name}`
+
+codegen_ssa_invalid_monomorphization_simd_argument = invalid monomorphization of `{$name}` intrinsic: expected SIMD argument type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_simd_input = invalid monomorphization of `{$name}` intrinsic: expected SIMD input type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_simd_first = invalid monomorphization of `{$name}` intrinsic: expected SIMD first type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_simd_second = invalid monomorphization of `{$name}` intrinsic: expected SIMD second type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_simd_third = invalid monomorphization of `{$name}` intrinsic: expected SIMD third type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_simd_return = invalid monomorphization of `{$name}` intrinsic: expected SIMD return type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_invalid_bitmask = invalid monomorphization of `{$name}` intrinsic: invalid bitmask `{$mask_ty}`, expected `u{$expected_int_bits}` or `[u8; {$expected_bytes}]`
+
+codegen_ssa_polymorphic_constant_too_generic = codegen encountered polymorphic constant: TooGeneric
+
+codegen_ssa_invalid_monomorphization_return_length_input_type = invalid monomorphization of `{$name}` intrinsic: expected return type with length {$in_len} (same as input type `{$in_ty}`), found `{$ret_ty}` with length {$out_len}
+
+codegen_ssa_invalid_monomorphization_second_argument_length = invalid monomorphization of `{$name}` intrinsic: expected second argument with length {$in_len} (same as input type `{$in_ty}`), found `{$arg_ty}` with length {$out_len}
+
+codegen_ssa_invalid_monomorphization_third_argument_length = invalid monomorphization of `{$name}` intrinsic: expected third argument with length {$in_len} (same as input type `{$in_ty}`), found `{$arg_ty}` with length {$out_len}
+
+codegen_ssa_invalid_monomorphization_return_integer_type = invalid monomorphization of `{$name}` intrinsic: expected return type with integer elements, found `{$ret_ty}` with non-integer `{$out_ty}`
+
+codegen_ssa_invalid_monomorphization_simd_shuffle = invalid monomorphization of `{$name}` intrinsic: simd_shuffle index must be an array of `u32`, got `{$ty}`
+
+codegen_ssa_invalid_monomorphization_return_length = invalid monomorphization of `{$name}` intrinsic: expected return type of length {$in_len}, found `{$ret_ty}` with length {$out_len}
+
+codegen_ssa_invalid_monomorphization_return_element = invalid monomorphization of `{$name}` intrinsic: expected return element type `{$in_elem}` (element of input `{$in_ty}`), found `{$ret_ty}` with element type `{$out_ty}`
+
+codegen_ssa_invalid_monomorphization_shuffle_index_not_constant = invalid monomorphization of `{$name}` intrinsic: shuffle index #{$arg_idx} is not a constant
+
+codegen_ssa_invalid_monomorphization_shuffle_index_out_of_bounds = invalid monomorphization of `{$name}` intrinsic: shuffle index #{$arg_idx} is out of bounds (limit {$total_len})
+
+codegen_ssa_invalid_monomorphization_inserted_type = invalid monomorphization of `{$name}` intrinsic: expected inserted type `{$in_elem}` (element of input `{$in_ty}`), found `{$out_ty}`
+
+codegen_ssa_invalid_monomorphization_return_type = invalid monomorphization of `{$name}` intrinsic: expected return type `{$in_elem}` (element of input `{$in_ty}`), found `{$ret_ty}`
+
+codegen_ssa_invalid_monomorphization_expected_return_type = invalid monomorphization of `{$name}` intrinsic: expected return type `{$in_ty}`, found `{$ret_ty}`
+
+codegen_ssa_invalid_monomorphization_mismatched_lengths = invalid monomorphization of `{$name}` intrinsic: mismatched lengths: mask length `{$m_len}` != other vector length `{$v_len}`
+
+codegen_ssa_invalid_monomorphization_mask_type = invalid monomorphization of `{$name}` intrinsic: mask element type is `{$ty}`, expected `i_`
+
+codegen_ssa_invalid_monomorphization_vector_argument = invalid monomorphization of `{$name}` intrinsic: vector argument `{$in_ty}`'s element type `{$in_elem}`, expected integer element type
+
+codegen_ssa_invalid_monomorphization_cannot_return = invalid monomorphization of `{$name}` intrinsic: cannot return `{$ret_ty}`, expected `u{$expected_int_bits}` or `[u8; {$expected_bytes}]`
+
+codegen_ssa_invalid_monomorphization_expected_element_type = invalid monomorphization of `{$name}` intrinsic: expected element type `{$expected_element}` of second argument `{$second_arg}` to be a pointer to the element type `{$in_elem}` of the first argument `{$in_ty}`, found `{$expected_element}` != `{$mutability} {$in_elem}`
+
+codegen_ssa_invalid_monomorphization_third_arg_element_type = invalid monomorphization of `{$name}` intrinsic: expected element type `{$expected_element}` of third argument `{$third_arg}` to be a signed integer type
+
+codegen_ssa_invalid_monomorphization_unsupported_symbol_of_size = invalid monomorphization of `{$name}` intrinsic: unsupported {$symbol} from `{$in_ty}` with element `{$in_elem}` of size `{$size}` to `{$ret_ty}`
+
+codegen_ssa_invalid_monomorphization_unsupported_symbol = invalid monomorphization of `{$name}` intrinsic: unsupported {$symbol} from `{$in_ty}` with element `{$in_elem}` to `{$ret_ty}`
+
+codegen_ssa_invalid_monomorphization_cast_fat_pointer = invalid monomorphization of `{$name}` intrinsic: cannot cast fat pointer `{$ty}`
+
+codegen_ssa_invalid_monomorphization_expected_pointer = invalid monomorphization of `{$name}` intrinsic: expected pointer, got `{$ty}`
+
+codegen_ssa_invalid_monomorphization_expected_usize = invalid monomorphization of `{$name}` intrinsic: expected `usize`, got `{$ty}`
+
+codegen_ssa_invalid_monomorphization_unsupported_cast = invalid monomorphization of `{$name}` intrinsic: unsupported cast from `{$in_ty}` with element `{$in_elem}` to `{$ret_ty}` with element `{$out_elem}`
+
+codegen_ssa_invalid_monomorphization_unsupported_operation = invalid monomorphization of `{$name}` intrinsic: unsupported operation on `{$in_ty}` with element `{$in_elem}`
+
+codegen_ssa_invalid_monomorphization_expected_vector_element_type = invalid monomorphization of `{$name}` intrinsic: expected element type `{$expected_element}` of vector type `{$vector_type}` to be a signed or unsigned integer type
diff --git a/compiler/rustc_codegen_ssa/src/errors.rs b/compiler/rustc_codegen_ssa/src/errors.rs
index d81252653df..6dea7496fc3 100644
--- a/compiler/rustc_codegen_ssa/src/errors.rs
+++ b/compiler/rustc_codegen_ssa/src/errors.rs
@@ -1,8 +1,9 @@
 //! Errors emitted by codegen_ssa
 
 use crate::back::command::Command;
+use crate::fluent_generated as fluent;
 use rustc_errors::{
-    fluent, DiagnosticArgValue, DiagnosticBuilder, ErrorGuaranteed, Handler, IntoDiagnostic,
+    DiagnosticArgValue, DiagnosticBuilder, ErrorGuaranteed, Handler, IntoDiagnostic,
     IntoDiagnosticArg,
 };
 use rustc_macros::Diagnostic;
@@ -388,7 +389,7 @@ pub struct LinkerNotFound {
 #[derive(Diagnostic)]
 #[diag(codegen_ssa_unable_to_exe_linker)]
 #[note]
-#[note(command_note)]
+#[note(codegen_ssa_command_note)]
 pub struct UnableToExeLinker {
     pub linker_path: PathBuf,
     pub error: Error,
diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs
index 7d51cee307e..ebe9e50ffe6 100644
--- a/compiler/rustc_codegen_ssa/src/lib.rs
+++ b/compiler/rustc_codegen_ssa/src/lib.rs
@@ -25,7 +25,9 @@ extern crate rustc_middle;
 use rustc_ast as ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::Lrc;
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_hir::def_id::CrateNum;
+use rustc_macros::fluent_messages;
 use rustc_middle::dep_graph::WorkProduct;
 use rustc_middle::middle::dependency_format::Dependencies;
 use rustc_middle::middle::exported_symbols::SymbolExportKind;
@@ -54,6 +56,8 @@ pub mod mono_item;
 pub mod target_features;
 pub mod traits;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 pub struct ModuleCodegen<M> {
     /// The name of the module. When the crate may be saved between
     /// compilations, incremental compilation requires that name be
diff --git a/compiler/rustc_const_eval/locales/en-US.ftl b/compiler/rustc_const_eval/locales/en-US.ftl
new file mode 100644
index 00000000000..33bb116d6fa
--- /dev/null
+++ b/compiler/rustc_const_eval/locales/en-US.ftl
@@ -0,0 +1,83 @@
+const_eval_unstable_in_stable =
+    const-stable function cannot use `#[feature({$gate})]`
+    .unstable_sugg = if it is not part of the public API, make this function unstably const
+    .bypass_sugg = otherwise `#[rustc_allow_const_fn_unstable]` can be used to bypass stability checks
+
+const_eval_thread_local_access =
+    thread-local statics cannot be accessed at compile-time
+
+const_eval_static_access =
+    {$kind}s cannot refer to statics
+    .help = consider extracting the value of the `static` to a `const`, and referring to that
+    .teach_note = `static` and `const` variables can refer to other `const` variables. A `const` variable, however, cannot refer to a `static` variable.
+    .teach_help = To fix this, the value can be extracted to a `const` and then used.
+
+const_eval_raw_ptr_to_int =
+    pointers cannot be cast to integers during const eval
+    .note = at compile-time, pointers do not have an integer value
+    .note2 = avoiding this restriction via `transmute`, `union`, or raw pointers leads to compile-time undefined behavior
+
+const_eval_raw_ptr_comparison =
+    pointers cannot be reliably compared during const eval
+    .note = see issue #53020 <https://github.com/rust-lang/rust/issues/53020> for more information
+
+const_eval_panic_non_str = argument to `panic!()` in a const context must have type `&str`
+
+const_eval_mut_deref =
+    mutation through a reference is not allowed in {$kind}s
+
+const_eval_transient_mut_borrow = mutable references are not allowed in {$kind}s
+
+const_eval_transient_mut_borrow_raw = raw mutable references are not allowed in {$kind}s
+
+const_eval_max_num_nodes_in_const = maximum number of nodes exceeded in constant {$global_const_id}
+
+const_eval_unallowed_fn_pointer_call = function pointer calls are not allowed in {$kind}s
+
+const_eval_unstable_const_fn = `{$def_path}` is not yet stable as a const fn
+
+const_eval_unallowed_mutable_refs =
+    mutable references are not allowed in the final value of {$kind}s
+    .teach_note =
+        References in statics and constants may only refer to immutable values.\n\n
+        Statics are shared everywhere, and if they refer to mutable data one might violate memory
+        safety since holding multiple mutable references to shared data is not allowed.\n\n
+        If you really want global mutable state, try using static mut or a global UnsafeCell.
+
+const_eval_unallowed_mutable_refs_raw =
+    raw mutable references are not allowed in the final value of {$kind}s
+    .teach_note =
+        References in statics and constants may only refer to immutable values.\n\n
+        Statics are shared everywhere, and if they refer to mutable data one might violate memory
+        safety since holding multiple mutable references to shared data is not allowed.\n\n
+        If you really want global mutable state, try using static mut or a global UnsafeCell.
+
+const_eval_non_const_fmt_macro_call =
+    cannot call non-const formatting macro in {$kind}s
+
+const_eval_non_const_fn_call =
+    cannot call non-const fn `{$def_path_str}` in {$kind}s
+
+const_eval_unallowed_op_in_const_context =
+    {$msg}
+
+const_eval_unallowed_heap_allocations =
+    allocations are not allowed in {$kind}s
+    .label = allocation not allowed in {$kind}s
+    .teach_note =
+        The value of statics and constants must be known at compile time, and they live for the entire lifetime of a program. Creating a boxed value allocates memory on the heap at runtime, and therefore cannot be done at compile time.
+
+const_eval_unallowed_inline_asm =
+    inline assembly is not allowed in {$kind}s
+
+const_eval_interior_mutable_data_refer =
+    {$kind}s cannot refer to interior mutable data
+    .label = this borrow of an interior mutable value may end up in the final value
+    .help = to fix this, the value can be extracted to a separate `static` item and then referenced
+    .teach_note =
+        A constant containing interior mutable data behind a reference can allow you to modify that data.
+        This would make multiple uses of a constant to be able to see different values and allow circumventing
+        the `Send` and `Sync` requirements for shared mutable data, which is unsound.
+
+const_eval_interior_mutability_borrow =
+    cannot borrow here, since the borrowed element may contain interior mutability
diff --git a/compiler/rustc_const_eval/src/errors.rs b/compiler/rustc_const_eval/src/errors.rs
index 4b055076742..f8b7cc6d7e1 100644
--- a/compiler/rustc_const_eval/src/errors.rs
+++ b/compiler/rustc_const_eval/src/errors.rs
@@ -9,12 +9,12 @@ pub(crate) struct UnstableInStable {
     #[primary_span]
     pub span: Span,
     #[suggestion(
-        unstable_sugg,
+        const_eval_unstable_sugg,
         code = "#[rustc_const_unstable(feature = \"...\", issue = \"...\")]\n",
         applicability = "has-placeholders"
     )]
     #[suggestion(
-        bypass_sugg,
+        const_eval_bypass_sugg,
         code = "#[rustc_allow_const_fn_unstable({gate})]\n",
         applicability = "has-placeholders"
     )]
@@ -35,15 +35,15 @@ pub(crate) struct StaticAccessErr {
     #[primary_span]
     pub span: Span,
     pub kind: ConstContext,
-    #[note(teach_note)]
-    #[help(teach_help)]
+    #[note(const_eval_teach_note)]
+    #[help(const_eval_teach_help)]
     pub teach: Option<()>,
 }
 
 #[derive(Diagnostic)]
 #[diag(const_eval_raw_ptr_to_int)]
 #[note]
-#[note(note2)]
+#[note(const_eval_note2)]
 pub(crate) struct RawPtrToIntErr {
     #[primary_span]
     pub span: Span,
@@ -118,7 +118,7 @@ pub(crate) struct UnallowedMutableRefs {
     #[primary_span]
     pub span: Span,
     pub kind: ConstContext,
-    #[note(teach_note)]
+    #[note(const_eval_teach_note)]
     pub teach: Option<()>,
 }
 
@@ -128,7 +128,7 @@ pub(crate) struct UnallowedMutableRefsRaw {
     #[primary_span]
     pub span: Span,
     pub kind: ConstContext,
-    #[note(teach_note)]
+    #[note(const_eval_teach_note)]
     pub teach: Option<()>,
 }
 #[derive(Diagnostic)]
@@ -163,7 +163,7 @@ pub(crate) struct UnallowedHeapAllocations {
     #[label]
     pub span: Span,
     pub kind: ConstContext,
-    #[note(teach_note)]
+    #[note(const_eval_teach_note)]
     pub teach: Option<()>,
 }
 
@@ -184,7 +184,7 @@ pub(crate) struct InteriorMutableDataRefer {
     #[help]
     pub opt_help: Option<()>,
     pub kind: ConstContext,
-    #[note(teach_note)]
+    #[note(const_eval_teach_note)]
     pub teach: Option<()>,
 }
 
diff --git a/compiler/rustc_const_eval/src/lib.rs b/compiler/rustc_const_eval/src/lib.rs
index 964efcc9062..fc6d61c79c2 100644
--- a/compiler/rustc_const_eval/src/lib.rs
+++ b/compiler/rustc_const_eval/src/lib.rs
@@ -34,10 +34,14 @@ pub mod interpret;
 pub mod transform;
 pub mod util;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
 use rustc_middle::ty;
 use rustc_middle::ty::query::Providers;
 use rustc_target::abi::InitKind;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 pub fn provide(providers: &mut Providers) {
     const_eval::provide(providers);
     providers.eval_to_const_value_raw = const_eval::eval_to_const_value_raw_provider;
diff --git a/compiler/rustc_driver_impl/Cargo.toml b/compiler/rustc_driver_impl/Cargo.toml
index cdec4f91277..7b59a52cffe 100644
--- a/compiler/rustc_driver_impl/Cargo.toml
+++ b/compiler/rustc_driver_impl/Cargo.toml
@@ -9,6 +9,27 @@ edition = "2021"
 tracing = { version = "0.1.35" }
 serde_json = "1.0.59"
 rustc_log = { path = "../rustc_log" }
+rustc_ast_lowering = { path = "../rustc_ast_lowering" }
+rustc_ast_passes = { path = "../rustc_ast_passes" }
+rustc_attr = { path = "../rustc_attr" }
+rustc_borrowck = { path = "../rustc_borrowck" }
+rustc_builtin_macros = { path = "../rustc_builtin_macros" }
+rustc_const_eval = { path = "../rustc_const_eval" }
+rustc_error_messages = { path = "../rustc_error_messages" }
+rustc_expand = { path = "../rustc_expand" }
+rustc_hir_typeck = { path = "../rustc_hir_typeck" }
+rustc_incremental = { path = "../rustc_incremental" }
+rustc_infer = { path = "../rustc_infer" }
+rustc_mir_build = { path = "../rustc_mir_build" }
+rustc_mir_dataflow = { path = "../rustc_mir_dataflow" }
+rustc_monomorphize = { path = "../rustc_monomorphize" }
+rustc_passes = { path = "../rustc_passes" }
+rustc_privacy = { path = "../rustc_privacy" }
+rustc_query_system = { path = "../rustc_query_system" }
+rustc_resolve = { path = "../rustc_resolve" }
+rustc_symbol_mangling = { path = "../rustc_symbol_mangling" }
+rustc_trait_selection = { path = "../rustc_trait_selection" }
+rustc_ty_utils = { path = "../rustc_ty_utils" }
 rustc_middle = { path = "../rustc_middle" }
 rustc_ast_pretty = { path = "../rustc_ast_pretty" }
 rustc_target = { path = "../rustc_target" }
diff --git a/compiler/rustc_driver_impl/locales/en-US.ftl b/compiler/rustc_driver_impl/locales/en-US.ftl
new file mode 100644
index 00000000000..f19b1ff6426
--- /dev/null
+++ b/compiler/rustc_driver_impl/locales/en-US.ftl
@@ -0,0 +1,19 @@
+driver_impl_rlink_unable_to_read = failed to read rlink file: `{$err}`
+
+driver_impl_rlink_wrong_file_type = The input does not look like a .rlink file
+
+driver_impl_rlink_empty_version_number = The input does not contain version number
+
+driver_impl_rlink_encoding_version_mismatch = .rlink file was produced with encoding version `{$version_array}`, but the current version is `{$rlink_version}`
+
+driver_impl_rlink_rustc_version_mismatch = .rlink file was produced by rustc version `{$rustc_version}`, but the current version is `{$current_version}`
+
+driver_impl_rlink_no_a_file = rlink must be a file
+
+driver_impl_unpretty_dump_fail = pretty-print failed to write `{$path}` due to error `{$err}`
+
+driver_impl_ice = the compiler unexpectedly panicked. this is a bug.
+driver_impl_ice_bug_report = we would appreciate a bug report: {$bug_report_url}
+driver_impl_ice_version = rustc {$version} running on {$triple}
+driver_impl_ice_flags = compiler flags: {$flags}
+driver_impl_ice_exclude_cargo_defaults = some of the compiler flags provided by cargo are hidden
diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index d7e9e00f3b6..f696cc20e23 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -23,11 +23,14 @@ use rustc_codegen_ssa::{traits::CodegenBackend, CodegenErrors, CodegenResults};
 use rustc_data_structures::profiling::{get_resident_set_size, print_time_passes_entry};
 use rustc_data_structures::sync::SeqCst;
 use rustc_errors::registry::{InvalidErrorCode, Registry};
-use rustc_errors::{ErrorGuaranteed, PResult, TerminalUrl};
+use rustc_errors::{
+    DiagnosticMessage, ErrorGuaranteed, PResult, SubdiagnosticMessage, TerminalUrl,
+};
 use rustc_feature::find_gated_cfg;
 use rustc_interface::util::{self, collect_crate_types, get_codegen_backend};
 use rustc_interface::{interface, Queries};
 use rustc_lint::LintStore;
+use rustc_macros::fluent_messages;
 use rustc_metadata::locator;
 use rustc_session::config::{nightly_options, CG_OPTIONS, Z_OPTIONS};
 use rustc_session::config::{ErrorOutputType, Input, OutputType, PrintRequest, TrimmedDefPaths};
@@ -61,6 +64,44 @@ use crate::session_diagnostics::{
     RLinkWrongFileType, RlinkNotAFile, RlinkUnableToRead,
 };
 
+fluent_messages! { "../locales/en-US.ftl" }
+
+pub static DEFAULT_LOCALE_RESOURCES: &[&str] = &[
+    // tidy-alphabetical-start
+    crate::DEFAULT_LOCALE_RESOURCE,
+    rustc_ast_lowering::DEFAULT_LOCALE_RESOURCE,
+    rustc_ast_passes::DEFAULT_LOCALE_RESOURCE,
+    rustc_attr::DEFAULT_LOCALE_RESOURCE,
+    rustc_borrowck::DEFAULT_LOCALE_RESOURCE,
+    rustc_builtin_macros::DEFAULT_LOCALE_RESOURCE,
+    rustc_codegen_ssa::DEFAULT_LOCALE_RESOURCE,
+    rustc_const_eval::DEFAULT_LOCALE_RESOURCE,
+    rustc_error_messages::DEFAULT_LOCALE_RESOURCE,
+    rustc_expand::DEFAULT_LOCALE_RESOURCE,
+    rustc_hir_analysis::DEFAULT_LOCALE_RESOURCE,
+    rustc_hir_typeck::DEFAULT_LOCALE_RESOURCE,
+    rustc_incremental::DEFAULT_LOCALE_RESOURCE,
+    rustc_infer::DEFAULT_LOCALE_RESOURCE,
+    rustc_interface::DEFAULT_LOCALE_RESOURCE,
+    rustc_lint::DEFAULT_LOCALE_RESOURCE,
+    rustc_metadata::DEFAULT_LOCALE_RESOURCE,
+    rustc_middle::DEFAULT_LOCALE_RESOURCE,
+    rustc_mir_build::DEFAULT_LOCALE_RESOURCE,
+    rustc_mir_dataflow::DEFAULT_LOCALE_RESOURCE,
+    rustc_monomorphize::DEFAULT_LOCALE_RESOURCE,
+    rustc_parse::DEFAULT_LOCALE_RESOURCE,
+    rustc_passes::DEFAULT_LOCALE_RESOURCE,
+    rustc_plugin_impl::DEFAULT_LOCALE_RESOURCE,
+    rustc_privacy::DEFAULT_LOCALE_RESOURCE,
+    rustc_query_system::DEFAULT_LOCALE_RESOURCE,
+    rustc_resolve::DEFAULT_LOCALE_RESOURCE,
+    rustc_session::DEFAULT_LOCALE_RESOURCE,
+    rustc_symbol_mangling::DEFAULT_LOCALE_RESOURCE,
+    rustc_trait_selection::DEFAULT_LOCALE_RESOURCE,
+    rustc_ty_utils::DEFAULT_LOCALE_RESOURCE,
+    // tidy-alphabetical-end
+];
+
 /// Exit status code used for successful compilation and help output.
 pub const EXIT_SUCCESS: i32 = 0;
 
@@ -218,6 +259,7 @@ fn run_compiler(
         output_file: ofile,
         output_dir: odir,
         file_loader,
+        locale_resources: DEFAULT_LOCALE_RESOURCES,
         lint_caps: Default::default(),
         parse_sess_created: None,
         register_lints: None,
@@ -320,7 +362,7 @@ fn run_compiler(
             }
 
             // Make sure name resolution and macro expansion is run.
-            queries.global_ctxt()?.enter(|tcx| tcx.resolver_for_lowering(()));
+            queries.global_ctxt()?;
 
             if callbacks.after_expansion(compiler, queries) == Compilation::Stop {
                 return early_exit();
@@ -1162,7 +1204,7 @@ static DEFAULT_HOOK: LazyLock<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send +
 /// hook.
 pub fn report_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
     let fallback_bundle =
-        rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+        rustc_errors::fallback_fluent_bundle(crate::DEFAULT_LOCALE_RESOURCES, false);
     let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
         rustc_errors::ColorConfig::Auto,
         None,
diff --git a/compiler/rustc_error_messages/locales/en-US.ftl b/compiler/rustc_error_messages/locales/en-US.ftl
new file mode 100644
index 00000000000..e6292374448
--- /dev/null
+++ b/compiler/rustc_error_messages/locales/en-US.ftl
@@ -0,0 +1 @@
+# satisfy tidy lint by having a line in this file
diff --git a/compiler/rustc_error_messages/locales/en-US/ast_lowering.ftl b/compiler/rustc_error_messages/locales/en-US/ast_lowering.ftl
deleted file mode 100644
index 03c88c6c0eb..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/ast_lowering.ftl
+++ /dev/null
@@ -1,141 +0,0 @@
-ast_lowering_generic_type_with_parentheses =
-    parenthesized type parameters may only be used with a `Fn` trait
-    .label = only `Fn` traits may use parentheses
-
-ast_lowering_use_angle_brackets = use angle brackets instead
-
-ast_lowering_invalid_abi =
-    invalid ABI: found `{$abi}`
-    .label = invalid ABI
-    .note = invoke `{$command}` for a full list of supported calling conventions.
-
-ast_lowering_invalid_abi_suggestion = did you mean
-
-ast_lowering_assoc_ty_parentheses =
-    parenthesized generic arguments cannot be used in associated type constraints
-
-ast_lowering_remove_parentheses = remove these parentheses
-
-ast_lowering_misplaced_impl_trait =
-    `impl Trait` only allowed in function and inherent method return types, not in {$position}
-
-ast_lowering_rustc_box_attribute_error =
-    #[rustc_box] requires precisely one argument and no other attributes are allowed
-
-ast_lowering_underscore_expr_lhs_assign =
-    in expressions, `_` can only be used on the left-hand side of an assignment
-    .label = `_` not allowed here
-
-ast_lowering_base_expression_double_dot =
-    base expression required after `..`
-    .label = add a base expression here
-
-ast_lowering_await_only_in_async_fn_and_blocks =
-    `await` is only allowed inside `async` functions and blocks
-    .label = only allowed inside `async` functions and blocks
-
-ast_lowering_this_not_async = this is not `async`
-
-ast_lowering_generator_too_many_parameters =
-    too many parameters for a generator (expected 0 or 1 parameters)
-
-ast_lowering_closure_cannot_be_static = closures cannot be static
-
-ast_lowering_async_non_move_closure_not_supported =
-    `async` non-`move` closures with parameters are not currently supported
-    .help = consider using `let` statements to manually capture variables by reference before entering an `async move` closure
-
-ast_lowering_functional_record_update_destructuring_assignment =
-    functional record updates are not allowed in destructuring assignments
-    .suggestion = consider removing the trailing pattern
-
-ast_lowering_async_generators_not_supported =
-    `async` generators are not yet supported
-
-ast_lowering_inline_asm_unsupported_target =
-    inline assembly is unsupported on this target
-
-ast_lowering_att_syntax_only_x86 =
-    the `att_syntax` option is only supported on x86
-
-ast_lowering_abi_specified_multiple_times =
-    `{$prev_name}` ABI specified multiple times
-    .label = previously specified here
-    .note = these ABIs are equivalent on the current target
-
-ast_lowering_clobber_abi_not_supported =
-    `clobber_abi` is not supported on this target
-
-ast_lowering_invalid_abi_clobber_abi =
-    invalid ABI for `clobber_abi`
-    .note = the following ABIs are supported on this target: {$supported_abis}
-
-ast_lowering_invalid_register =
-    invalid register `{$reg}`: {$error}
-
-ast_lowering_invalid_register_class =
-    invalid register class `{$reg_class}`: {$error}
-
-ast_lowering_invalid_asm_template_modifier_reg_class =
-    invalid asm template modifier for this register class
-
-ast_lowering_argument = argument
-
-ast_lowering_template_modifier = template modifier
-
-ast_lowering_support_modifiers =
-    the `{$class_name}` register class supports the following template modifiers: {$modifiers}
-
-ast_lowering_does_not_support_modifiers =
-    the `{$class_name}` register class does not support template modifiers
-
-ast_lowering_invalid_asm_template_modifier_const =
-    asm template modifiers are not allowed for `const` arguments
-
-ast_lowering_invalid_asm_template_modifier_sym =
-    asm template modifiers are not allowed for `sym` arguments
-
-ast_lowering_register_class_only_clobber =
-    register class `{$reg_class_name}` can only be used as a clobber, not as an input or output
-
-ast_lowering_register_conflict =
-    register `{$reg1_name}` conflicts with register `{$reg2_name}`
-    .help = use `lateout` instead of `out` to avoid conflict
-
-ast_lowering_register1 = register `{$reg1_name}`
-
-ast_lowering_register2 = register `{$reg2_name}`
-
-ast_lowering_sub_tuple_binding =
-    `{$ident_name} @` is not allowed in a {$ctx}
-    .label = this is only allowed in slice patterns
-    .help = remove this and bind each tuple field independently
-
-ast_lowering_sub_tuple_binding_suggestion = if you don't need to use the contents of {$ident}, discard the tuple's remaining fields
-
-ast_lowering_extra_double_dot =
-    `..` can only be used once per {$ctx} pattern
-    .label = can only be used once per {$ctx} pattern
-
-ast_lowering_previously_used_here = previously used here
-
-ast_lowering_misplaced_double_dot =
-    `..` patterns are not allowed here
-    .note = only allowed in tuple, tuple struct, and slice patterns
-
-ast_lowering_misplaced_relax_trait_bound =
-    `?Trait` bounds are only permitted at the point where a type parameter is declared
-
-ast_lowering_not_supported_for_lifetime_binder_async_closure =
-    `for<...>` binders on `async` closures are not currently supported
-
-ast_lowering_arbitrary_expression_in_pattern =
-    arbitrary expressions aren't allowed in patterns
-
-ast_lowering_inclusive_range_with_no_end = inclusive range with no end
-
-ast_lowering_trait_fn_async =
-    functions in traits cannot be declared `async`
-    .label = `async` because of this
-    .note = `async` trait functions are not currently supported
-    .note2 = consider using the `async-trait` crate: https://crates.io/crates/async-trait
diff --git a/compiler/rustc_error_messages/locales/en-US/ast_passes.ftl b/compiler/rustc_error_messages/locales/en-US/ast_passes.ftl
deleted file mode 100644
index 5f28839f136..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/ast_passes.ftl
+++ /dev/null
@@ -1,92 +0,0 @@
-ast_passes_forbidden_let =
-    `let` expressions are not supported here
-    .note = only supported directly in conditions of `if` and `while` expressions
-    .not_supported_or = `||` operators are not supported in let chain expressions
-    .not_supported_parentheses = `let`s wrapped in parentheses are not supported in a context with let chains
-
-ast_passes_forbidden_let_stable =
-    expected expression, found statement (`let`)
-    .note = variable declaration using `let` is a statement
-
-ast_passes_deprecated_where_clause_location =
-    where clause not allowed here
-
-ast_passes_forbidden_assoc_constraint =
-    associated type bounds are not allowed within structs, enums, or unions
-
-ast_passes_keyword_lifetime =
-    lifetimes cannot use keyword names
-
-ast_passes_invalid_label =
-    invalid label name `{$name}`
-
-ast_passes_invalid_visibility =
-    unnecessary visibility qualifier
-    .implied = `pub` not permitted here because it's implied
-    .individual_impl_items = place qualifiers on individual impl items instead
-    .individual_foreign_items = place qualifiers on individual foreign items instead
-
-ast_passes_trait_fn_const =
-    functions in traits cannot be declared const
-    .label = functions in traits cannot be const
-
-ast_passes_forbidden_lifetime_bound =
-    lifetime bounds cannot be used in this context
-
-ast_passes_forbidden_non_lifetime_param =
-    only lifetime parameters can be used in this context
-
-ast_passes_fn_param_too_many =
-    function can not have more than {$max_num_args} arguments
-
-ast_passes_fn_param_c_var_args_only =
-    C-variadic function must be declared with at least one named argument
-
-ast_passes_fn_param_c_var_args_not_last =
-    `...` must be the last argument of a C-variadic function
-
-ast_passes_fn_param_doc_comment =
-    documentation comments cannot be applied to function parameters
-    .label = doc comments are not allowed here
-
-ast_passes_fn_param_forbidden_attr =
-    allow, cfg, cfg_attr, deny, expect, forbid, and warn are the only allowed built-in attributes in function parameters
-
-ast_passes_fn_param_forbidden_self =
-    `self` parameter is only allowed in associated functions
-    .label = not semantically valid as function parameter
-    .note = associated functions are those in `impl` or `trait` definitions
-
-ast_passes_forbidden_default =
-    `default` is only allowed on items in trait impls
-    .label = `default` because of this
-
-ast_passes_assoc_const_without_body =
-    associated constant in `impl` without body
-    .suggestion = provide a definition for the constant
-
-ast_passes_assoc_fn_without_body =
-    associated function in `impl` without body
-    .suggestion = provide a definition for the function
-
-ast_passes_assoc_type_without_body =
-    associated type in `impl` without body
-    .suggestion = provide a definition for the type
-
-ast_passes_const_without_body =
-    free constant item without body
-    .suggestion = provide a definition for the constant
-
-ast_passes_static_without_body =
-    free static item without body
-    .suggestion = provide a definition for the static
-
-ast_passes_ty_alias_without_body =
-    free type alias without body
-    .suggestion = provide a definition for the type
-
-ast_passes_fn_without_body =
-    free function without a body
-    .suggestion = provide a definition for the function
-
-ast_passes_extern_block_suggestion = if you meant to declare an externally defined function, use an `extern` block
diff --git a/compiler/rustc_error_messages/locales/en-US/attr.ftl b/compiler/rustc_error_messages/locales/en-US/attr.ftl
deleted file mode 100644
index a7f8c993d42..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/attr.ftl
+++ /dev/null
@@ -1,107 +0,0 @@
-attr_expected_one_cfg_pattern =
-    expected 1 cfg-pattern
-
-attr_invalid_predicate =
-    invalid predicate `{$predicate}`
-
-attr_multiple_item =
-    multiple '{$item}' items
-
-attr_incorrect_meta_item =
-    incorrect meta item
-
-attr_unknown_meta_item =
-    unknown meta item '{$item}'
-    .label = expected one of {$expected}
-
-attr_missing_since =
-    missing 'since'
-
-attr_missing_note =
-    missing 'note'
-
-attr_multiple_stability_levels =
-    multiple stability levels
-
-attr_invalid_issue_string =
-    `issue` must be a non-zero numeric string or "none"
-    .must_not_be_zero = `issue` must not be "0", use "none" instead
-    .empty = cannot parse integer from empty string
-    .invalid_digit = invalid digit found in string
-    .pos_overflow = number too large to fit in target type
-    .neg_overflow = number too small to fit in target type
-
-attr_missing_feature =
-    missing 'feature'
-
-attr_non_ident_feature =
-    'feature' is not an identifier
-
-attr_missing_issue =
-    missing 'issue'
-
-attr_incorrect_repr_format_packed_one_or_zero_arg =
-    incorrect `repr(packed)` attribute format: `packed` takes exactly one parenthesized argument, or no parentheses at all
-
-attr_invalid_repr_hint_no_paren =
-    invalid representation hint: `{$name}` does not take a parenthesized argument list
-
-attr_invalid_repr_hint_no_value =
-    invalid representation hint: `{$name}` does not take a value
-
-attr_unsupported_literal_generic =
-    unsupported literal
-attr_unsupported_literal_cfg_string =
-    literal in `cfg` predicate value must be a string
-attr_unsupported_literal_deprecated_string =
-    literal in `deprecated` value must be a string
-attr_unsupported_literal_deprecated_kv_pair =
-    item in `deprecated` must be a key/value pair
-attr_unsupported_literal_suggestion =
-    consider removing the prefix
-
-attr_invalid_repr_align_need_arg =
-    invalid `repr(align)` attribute: `align` needs an argument
-    .suggestion = supply an argument here
-
-attr_invalid_repr_generic =
-    invalid `repr({$repr_arg})` attribute: {$error_part}
-
-attr_incorrect_repr_format_align_one_arg =
-    incorrect `repr(align)` attribute format: `align` takes exactly one argument in parentheses
-
-attr_incorrect_repr_format_generic =
-    incorrect `repr({$repr_arg})` attribute format
-    .suggestion = use parentheses instead
-
-attr_rustc_promotable_pairing =
-    `rustc_promotable` attribute must be paired with either a `rustc_const_unstable` or a `rustc_const_stable` attribute
-
-attr_rustc_allowed_unstable_pairing =
-    `rustc_allowed_through_unstable_modules` attribute must be paired with a `stable` attribute
-
-attr_cfg_predicate_identifier =
-    `cfg` predicate key must be an identifier
-
-attr_deprecated_item_suggestion =
-    suggestions on deprecated items are unstable
-    .help = add `#![feature(deprecated_suggestion)]` to the crate root
-    .note = see #94785 for more details
-
-attr_expected_single_version_literal =
-    expected single version literal
-
-attr_expected_version_literal =
-    expected a version literal
-
-attr_expects_feature_list =
-    `{$name}` expects a list of feature names
-
-attr_expects_features =
-    `{$name}` expects feature names
-
-attr_soft_no_args =
-    `soft` should not have any arguments
-
-attr_unknown_version_literal =
-    unknown version literal format, assuming it refers to a future version
diff --git a/compiler/rustc_error_messages/locales/en-US/borrowck.ftl b/compiler/rustc_error_messages/locales/en-US/borrowck.ftl
deleted file mode 100644
index a3b6b5e8138..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/borrowck.ftl
+++ /dev/null
@@ -1,129 +0,0 @@
-borrowck_move_unsized =
-    cannot move a value of type `{$ty}`
-    .label = the size of `{$ty}` cannot be statically determined
-
-borrowck_higher_ranked_lifetime_error =
-    higher-ranked lifetime error
-
-borrowck_could_not_prove =
-    could not prove `{$predicate}`
-
-borrowck_could_not_normalize =
-    could not normalize `{$value}`
-
-borrowck_higher_ranked_subtype_error =
-    higher-ranked subtype error
-
-borrowck_generic_does_not_live_long_enough =
-    `{$kind}` does not live long enough
-
-borrowck_move_borrowed =
-    cannot move out of `{$desc}` because it is borrowed
-
-borrowck_var_does_not_need_mut =
-    variable does not need to be mutable
-    .suggestion = remove this `mut`
-
-borrowck_var_cannot_escape_closure =
-    captured variable cannot escape `FnMut` closure body
-    .note = `FnMut` closures only have access to their captured variables while they are executing...
-    .cannot_escape = ...therefore, they cannot allow references to captured variables to escape
-
-borrowck_var_here_defined = variable defined here
-
-borrowck_var_here_captured = variable captured here
-
-borrowck_closure_inferred_mut = inferred to be a `FnMut` closure
-
-borrowck_returned_closure_escaped =
-    returns a closure that contains a reference to a captured variable, which then escapes the closure body
-
-borrowck_returned_async_block_escaped =
-    returns an `async` block that contains a reference to a captured variable, which then escapes the closure body
-
-borrowck_returned_ref_escaped =
-    returns a reference to a captured variable which escapes the closure body
-
-borrowck_lifetime_constraints_error =
-    lifetime may not live long enough
-
-borrowck_returned_lifetime_wrong =
-    {$mir_def_name} was supposed to return data with lifetime `{$outlived_fr_name}` but it is returning data with lifetime `{$fr_name}`
-
-borrowck_returned_lifetime_short =
-    {$category_desc}requires that `{$free_region_name}` must outlive `{$outlived_fr_name}`
-
-borrowck_used_impl_require_static =
-    the used `impl` has a `'static` requirement
-
-borrowck_capture_kind_label =
-    capture is {$kind_desc} because of use here
-
-borrowck_var_borrow_by_use_place_in_generator =
-    borrow occurs due to use of {$place} in closure in generator
-
-borrowck_var_borrow_by_use_place_in_closure =
-    borrow occurs due to use of {$place} in closure
-
-borrowck_var_borrow_by_use_place =
-    borrow occurs due to use of {$place}
-
-borrowck_borrow_due_to_use_generator =
-    borrow occurs due to use in generator
-
-borrowck_use_due_to_use_generator =
-    use occurs due to use in generator
-
-borrowck_assign_due_to_use_generator =
-    assign occurs due to use in generator
-
-borrowck_assign_part_due_to_use_generator =
-    assign to part occurs due to use in generator
-
-borrowck_borrow_due_to_use_closure =
-    borrow occurs due to use in closure
-
-borrowck_use_due_to_use_closure =
-    use occurs due to use in closure
-
-borrowck_assign_due_to_use_closure =
-    assignment occurs due to use in closure
-
-borrowck_assign_part_due_to_use_closure =
-    assignment to part occurs due to use in closure
-
-borrowck_capture_immute =
-    capture is immutable because of use here
-
-borrowck_capture_mut =
-    capture is mutable because of use here
-
-borrowck_capture_move =
-    capture is moved because of use here
-
-borrowck_var_move_by_use_place_in_generator =
-    move occurs due to use of {$place} in generator
-
-borrowck_var_move_by_use_place_in_closure =
-    move occurs due to use of {$place} in closure
-
-borrowck_cannot_move_when_borrowed =
-    cannot move out of {$place ->
-        [value] value
-        *[other] {$place}
-    } because it is borrowed
-    .label = borrow of {$borrow_place ->
-        [value] value
-        *[other] {$borrow_place}
-    } occurs here
-    .move_label = move out of {$value_place ->
-        [value] value
-        *[other] {$value_place}
-    } occurs here
-
-borrowck_opaque_type_non_generic_param =
-    expected generic {$kind} parameter, found `{$ty}`
-    .label = {STREQ($ty, "'static") ->
-        [true] cannot use static lifetime; use a bound lifetime instead or remove the lifetime parameter from the opaque type
-        *[other] this generic parameter must be used with a generic {$kind} parameter
-    }
diff --git a/compiler/rustc_error_messages/locales/en-US/builtin_macros.ftl b/compiler/rustc_error_messages/locales/en-US/builtin_macros.ftl
deleted file mode 100644
index 4d088e27b36..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/builtin_macros.ftl
+++ /dev/null
@@ -1,5 +0,0 @@
-builtin_macros_requires_cfg_pattern =
-    macro requires a cfg-pattern as an argument
-    .label = cfg-pattern required
-
-builtin_macros_expected_one_cfg_pattern = expected 1 cfg-pattern
diff --git a/compiler/rustc_error_messages/locales/en-US/codegen_gcc.ftl b/compiler/rustc_error_messages/locales/en-US/codegen_gcc.ftl
deleted file mode 100644
index 6101b28ab0c..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/codegen_gcc.ftl
+++ /dev/null
@@ -1,62 +0,0 @@
-codegen_gcc_unwinding_inline_asm =
-    GCC backend does not support unwinding from inline asm
-
-codegen_gcc_lto_not_supported =
-    LTO is not supported. You may get a linker error.
-
-codegen_gcc_invalid_monomorphization_basic_integer =
-    invalid monomorphization of `{$name}` intrinsic: expected basic integer type, found `{$ty}`
-
-codegen_gcc_invalid_monomorphization_invalid_float_vector =
-    invalid monomorphization of `{$name}` intrinsic: unsupported element type `{$elem_ty}` of floating-point vector `{$vec_ty}`
-
-codegen_gcc_invalid_monomorphization_not_float =
-    invalid monomorphization of `{$name}` intrinsic: `{$ty}` is not a floating-point type
-
-codegen_gcc_invalid_monomorphization_unrecognized =
-    invalid monomorphization of `{$name}` intrinsic: unrecognized intrinsic `{$name}`
-
-codegen_gcc_invalid_monomorphization_expected_signed_unsigned =
-    invalid monomorphization of `{$name}` intrinsic: expected element type `{$elem_ty}` of vector type `{$vec_ty}` to be a signed or unsigned integer type
-
-codegen_gcc_invalid_monomorphization_unsupported_element =
-    invalid monomorphization of `{$name}` intrinsic: unsupported {$name} from `{$in_ty}` with element `{$elem_ty}` to `{$ret_ty}`
-
-codegen_gcc_invalid_monomorphization_invalid_bitmask =
-    invalid monomorphization of `{$name}` intrinsic: invalid bitmask `{$ty}`, expected `u{$expected_int_bits}` or `[u8; {$expected_bytes}]`
-
-codegen_gcc_invalid_monomorphization_simd_shuffle =
-    invalid monomorphization of `{$name}` intrinsic: simd_shuffle index must be an array of `u32`, got `{$ty}`
-
-codegen_gcc_invalid_monomorphization_expected_simd =
-    invalid monomorphization of `{$name}` intrinsic: expected SIMD {$expected_ty} type, found non-SIMD `{$found_ty}`
-
-codegen_gcc_invalid_monomorphization_mask_type =
-    invalid monomorphization of `{$name}` intrinsic: mask element type is `{$ty}`, expected `i_`
-
-codegen_gcc_invalid_monomorphization_return_length =
-    invalid monomorphization of `{$name}` intrinsic: expected return type of length {$in_len}, found `{$ret_ty}` with length {$out_len}
-
-codegen_gcc_invalid_monomorphization_return_length_input_type =
-    invalid monomorphization of `{$name}` intrinsic: expected return type with length {$in_len} (same as input type `{$in_ty}`), found `{$ret_ty}` with length {$out_len}
-
-codegen_gcc_invalid_monomorphization_return_element =
-    invalid monomorphization of `{$name}` intrinsic: expected return element type `{$in_elem}` (element of input `{$in_ty}`), found `{$ret_ty}` with element type `{$out_ty}`
-
-codegen_gcc_invalid_monomorphization_return_type =
-    invalid monomorphization of `{$name}` intrinsic: expected return type `{$in_elem}` (element of input `{$in_ty}`), found `{$ret_ty}`
-
-codegen_gcc_invalid_monomorphization_inserted_type =
-    invalid monomorphization of `{$name}` intrinsic: expected inserted type `{$in_elem}` (element of input `{$in_ty}`), found `{$out_ty}`
-
-codegen_gcc_invalid_monomorphization_return_integer_type =
-    invalid monomorphization of `{$name}` intrinsic: expected return type with integer elements, found `{$ret_ty}` with non-integer `{$out_ty}`
-
-codegen_gcc_invalid_monomorphization_mismatched_lengths =
-    invalid monomorphization of `{$name}` intrinsic: mismatched lengths: mask length `{$m_len}` != other vector length `{$v_len}`
-
-codegen_gcc_invalid_monomorphization_unsupported_cast =
-    invalid monomorphization of `{$name}` intrinsic: unsupported cast from `{$in_ty}` with element `{$in_elem}` to `{$ret_ty}` with element `{$out_elem}`
-
-codegen_gcc_invalid_monomorphization_unsupported_operation =
-    invalid monomorphization of `{$name}` intrinsic: unsupported operation on `{$in_ty}` with element `{$in_elem}`
diff --git a/compiler/rustc_error_messages/locales/en-US/codegen_llvm.ftl b/compiler/rustc_error_messages/locales/en-US/codegen_llvm.ftl
deleted file mode 100644
index e5df417370b..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/codegen_llvm.ftl
+++ /dev/null
@@ -1,89 +0,0 @@
-codegen_llvm_unknown_ctarget_feature =
-    unknown feature specified for `-Ctarget-feature`: `{$feature}`
-    .note = it is still passed through to the codegen backend
-    .possible_feature = you might have meant: `{$rust_feature}`
-    .consider_filing_feature_request = consider filing a feature request
-
-codegen_llvm_unknown_ctarget_feature_prefix =
-    unknown feature specified for `-Ctarget-feature`: `{$feature}`
-    .note = features must begin with a `+` to enable or `-` to disable it
-
-codegen_llvm_error_creating_import_library =
-    Error creating import library for {$lib_name}: {$error}
-
-codegen_llvm_symbol_already_defined =
-    symbol `{$symbol_name}` is already defined
-
-codegen_llvm_invalid_minimum_alignment =
-    invalid minimum global alignment: {$err}
-
-codegen_llvm_sanitizer_memtag_requires_mte =
-    `-Zsanitizer=memtag` requires `-Ctarget-feature=+mte`
-
-codegen_llvm_error_writing_def_file =
-    Error writing .DEF file: {$error}
-
-codegen_llvm_error_calling_dlltool =
-    Error calling dlltool: {$error}
-
-codegen_llvm_dlltool_fail_import_library =
-    Dlltool could not create import library: {$stdout}\n{$stderr}
-
-codegen_llvm_target_feature_disable_or_enable =
-    the target features {$features} must all be either enabled or disabled together
-
-codegen_llvm_missing_features =
-    add the missing features in a `target_feature` attribute
-
-codegen_llvm_dynamic_linking_with_lto =
-    cannot prefer dynamic linking when performing LTO
-    .note = only 'staticlib', 'bin', and 'cdylib' outputs are supported with LTO
-
-codegen_llvm_parse_target_machine_config =
-    failed to parse target machine config to target machine: {$error}
-
-codegen_llvm_lto_disallowed = lto can only be run for executables, cdylibs and static library outputs
-
-codegen_llvm_lto_dylib = lto cannot be used for `dylib` crate type without `-Zdylib-lto`
-
-codegen_llvm_lto_bitcode_from_rlib = failed to get bitcode from object file for LTO ({$llvm_err})
-
-codegen_llvm_write_output = could not write output to {$path}
-codegen_llvm_write_output_with_llvm_err = could not write output to {$path}: {$llvm_err}
-
-codegen_llvm_target_machine = could not create LLVM TargetMachine for triple: {$triple}
-codegen_llvm_target_machine_with_llvm_err = could not create LLVM TargetMachine for triple: {$triple}: {$llvm_err}
-
-codegen_llvm_run_passes = failed to run LLVM passes
-codegen_llvm_run_passes_with_llvm_err = failed to run LLVM passes: {$llvm_err}
-
-codegen_llvm_serialize_module = failed to serialize module {$name}
-codegen_llvm_serialize_module_with_llvm_err = failed to serialize module {$name}: {$llvm_err}
-
-codegen_llvm_write_ir = failed to write LLVM IR to {$path}
-codegen_llvm_write_ir_with_llvm_err = failed to write LLVM IR to {$path}: {$llvm_err}
-
-codegen_llvm_prepare_thin_lto_context = failed to prepare thin LTO context
-codegen_llvm_prepare_thin_lto_context_with_llvm_err = failed to prepare thin LTO context: {$llvm_err}
-
-codegen_llvm_load_bitcode = failed to load bitcode of module "{$name}"
-codegen_llvm_load_bitcode_with_llvm_err = failed to load bitcode of module "{$name}": {$llvm_err}
-
-codegen_llvm_write_thinlto_key = error while writing ThinLTO key data: {$err}
-codegen_llvm_write_thinlto_key_with_llvm_err = error while writing ThinLTO key data: {$err}: {$llvm_err}
-
-codegen_llvm_multiple_source_dicompileunit = multiple source DICompileUnits found
-codegen_llvm_multiple_source_dicompileunit_with_llvm_err = multiple source DICompileUnits found: {$llvm_err}
-
-codegen_llvm_prepare_thin_lto_module = failed to prepare thin LTO module
-codegen_llvm_prepare_thin_lto_module_with_llvm_err = failed to prepare thin LTO module: {$llvm_err}
-
-codegen_llvm_parse_bitcode = failed to parse bitcode for LTO module
-codegen_llvm_parse_bitcode_with_llvm_err = failed to parse bitcode for LTO module: {$llvm_err}
-
-codegen_llvm_from_llvm_optimization_diag = {$filename}:{$line}:{$column} {$pass_name}: {$message}
-codegen_llvm_from_llvm_diag = {$message}
-
-codegen_llvm_write_bytecode = failed to write bytecode to {$path}: {$err}
-
-codegen_llvm_copy_bitcode = failed to copy bitcode to object file: {$err}
diff --git a/compiler/rustc_error_messages/locales/en-US/codegen_ssa.ftl b/compiler/rustc_error_messages/locales/en-US/codegen_ssa.ftl
deleted file mode 100644
index 8fe5f8d50ab..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/codegen_ssa.ftl
+++ /dev/null
@@ -1,293 +0,0 @@
-codegen_ssa_lib_def_write_failure = failed to write lib.def file: {$error}
-
-codegen_ssa_version_script_write_failure = failed to write version script: {$error}
-
-codegen_ssa_symbol_file_write_failure = failed to write symbols file: {$error}
-
-codegen_ssa_ld64_unimplemented_modifier = `as-needed` modifier not implemented yet for ld64
-
-codegen_ssa_linker_unsupported_modifier = `as-needed` modifier not supported for current linker
-
-codegen_ssa_L4Bender_exporting_symbols_unimplemented = exporting symbols not implemented yet for L4Bender
-
-codegen_ssa_no_natvis_directory = error enumerating natvis directory: {$error}
-
-codegen_ssa_copy_path = could not copy {$from} to {$to}: {$error}
-
-codegen_ssa_copy_path_buf = unable to copy {$source_file} to {$output_path}: {$error}
-
-codegen_ssa_ignoring_emit_path = ignoring emit path because multiple .{$extension} files were produced
-
-codegen_ssa_ignoring_output = ignoring -o because multiple .{$extension} files were produced
-
-codegen_ssa_create_temp_dir = couldn't create a temp dir: {$error}
-
-codegen_ssa_incompatible_linking_modifiers = link modifiers combination `+bundle,+whole-archive` is unstable when generating rlibs
-
-codegen_ssa_add_native_library = failed to add native library {$library_path}: {$error}
-
-codegen_ssa_multiple_external_func_decl = multiple declarations of external function `{$function}` from library `{$library_name}` have different calling conventions
-
-codegen_ssa_rlib_missing_format = could not find formats for rlibs
-
-codegen_ssa_rlib_only_rmeta_found = could not find rlib for: `{$crate_name}`, found rmeta (metadata) file
-
-codegen_ssa_rlib_not_found = could not find rlib for: `{$crate_name}`
-
-codegen_ssa_rlib_incompatible_dependency_formats = `{$ty1}` and `{$ty2}` do not have equivalent dependency formats (`{$list1}` vs `{$list2}`)
-
-codegen_ssa_linking_failed = linking with `{$linker_path}` failed: {$exit_status}
-
-codegen_ssa_extern_funcs_not_found = some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
-
-codegen_ssa_specify_libraries_to_link = use the `-l` flag to specify native libraries to link
-
-codegen_ssa_use_cargo_directive = use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorustc-link-libkindname)
-
-codegen_ssa_thorin_read_input_failure = failed to read input file
-
-codegen_ssa_thorin_parse_input_file_kind = failed to parse input file kind
-
-codegen_ssa_thorin_parse_input_object_file = failed to parse input object file
-
-codegen_ssa_thorin_parse_input_archive_file = failed to parse input archive file
-
-codegen_ssa_thorin_parse_archive_member = failed to parse archive member
-
-codegen_ssa_thorin_invalid_input_kind = input is not an archive or elf object
-
-codegen_ssa_thorin_decompress_data = failed to decompress compressed section
-
-codegen_ssa_thorin_section_without_name = section without name at offset {$offset}
-
-codegen_ssa_thorin_relocation_with_invalid_symbol = relocation with invalid symbol for section `{$section}` at offset {$offset}
-
-codegen_ssa_thorin_multiple_relocations = multiple relocations for section `{$section}` at offset {$offset}
-
-codegen_ssa_thorin_unsupported_relocation = unsupported relocation for section {$section} at offset {$offset}
-
-codegen_ssa_thorin_missing_dwo_name = missing path attribute to DWARF object ({$id})
-
-codegen_ssa_thorin_no_compilation_units = input object has no compilation units
-
-codegen_ssa_thorin_no_die = no top-level debugging information entry in compilation/type unit
-
-codegen_ssa_thorin_top_level_die_not_unit = top-level debugging information entry is not a compilation/type unit
-
-codegen_ssa_thorin_missing_required_section = input object missing required section `{$section}`
-
-codegen_ssa_thorin_parse_unit_abbreviations = failed to parse unit abbreviations
-
-codegen_ssa_thorin_parse_unit_attribute = failed to parse unit attribute
-
-codegen_ssa_thorin_parse_unit_header = failed to parse unit header
-
-codegen_ssa_thorin_parse_unit = failed to parse unit
-
-codegen_ssa_thorin_incompatible_index_version = incompatible `{$section}` index version: found version {$actual}, expected version {$format}
-
-codegen_ssa_thorin_offset_at_index = read offset at index {$index} of `.debug_str_offsets.dwo` section
-
-codegen_ssa_thorin_str_at_offset = read string at offset {$offset} of `.debug_str.dwo` section
-
-codegen_ssa_thorin_parse_index = failed to parse `{$section}` index section
-
-codegen_ssa_thorin_unit_not_in_index = unit {$unit} from input package is not in its index
-
-codegen_ssa_thorin_row_not_in_index = row {$row} found in index's hash table not present in index
-
-codegen_ssa_thorin_section_not_in_row = section not found in unit's row in index
-
-codegen_ssa_thorin_empty_unit = unit {$unit} in input DWARF object with no data
-
-codegen_ssa_thorin_multiple_debug_info_section = multiple `.debug_info.dwo` sections
-
-codegen_ssa_thorin_multiple_debug_types_section = multiple `.debug_types.dwo` sections in a package
-
-codegen_ssa_thorin_not_split_unit = regular compilation unit in object (missing dwo identifier)
-
-codegen_ssa_thorin_duplicate_unit = duplicate split compilation unit ({$unit})
-
-codegen_ssa_thorin_missing_referenced_unit = unit {$unit} referenced by executable was not found
-
-codegen_ssa_thorin_not_output_object_created = no output object was created from inputs
-
-codegen_ssa_thorin_mixed_input_encodings = input objects haved mixed encodings
-
-codegen_ssa_thorin_io = {$error}
-codegen_ssa_thorin_object_read = {$error}
-codegen_ssa_thorin_object_write = {$error}
-codegen_ssa_thorin_gimli_read = {$error}
-codegen_ssa_thorin_gimli_write = {$error}
-
-codegen_ssa_link_exe_unexpected_error = `link.exe` returned an unexpected error
-
-codegen_ssa_repair_vs_build_tools = the Visual Studio build tools may need to be repaired using the Visual Studio installer
-
-codegen_ssa_missing_cpp_build_tool_component = or a necessary component may be missing from the "C++ build tools" workload
-
-codegen_ssa_select_cpp_build_tool_workload = in the Visual Studio installer, ensure the "C++ build tools" workload is selected
-
-codegen_ssa_visual_studio_not_installed = you may need to install Visual Studio build tools with the "C++ build tools" workload
-
-codegen_ssa_linker_not_found = linker `{$linker_path}` not found
-    .note = {$error}
-
-codegen_ssa_unable_to_exe_linker = could not exec the linker `{$linker_path}`
-    .note = {$error}
-    .command_note = {$command_formatted}
-
-codegen_ssa_msvc_missing_linker = the msvc targets depend on the msvc linker but `link.exe` was not found
-
-codegen_ssa_check_installed_visual_studio = please ensure that Visual Studio 2017 or later, or Build Tools for Visual Studio were installed with the Visual C++ option.
-
-codegen_ssa_unsufficient_vs_code_product = VS Code is a different product, and is not sufficient.
-
-codegen_ssa_processing_dymutil_failed = processing debug info with `dsymutil` failed: {$status}
-    .note = {$output}
-
-codegen_ssa_unable_to_run_dsymutil = unable to run `dsymutil`: {$error}
-
-codegen_ssa_stripping_debu_info_failed = stripping debug info with `{$util}` failed: {$status}
-    .note = {$output}
-
-codegen_ssa_unable_to_run = unable to run `{$util}`: {$error}
-
-codegen_ssa_linker_file_stem = couldn't extract file stem from specified linker
-
-codegen_ssa_static_library_native_artifacts = Link against the following native artifacts when linking against this static library. The order and any duplication can be significant on some platforms.
-
-codegen_ssa_link_script_unavailable = can only use link script when linking with GNU-like linker
-
-codegen_ssa_link_script_write_failure = failed to write link script to {$path}: {$error}
-
-codegen_ssa_failed_to_write = failed to write {$path}: {$error}
-
-codegen_ssa_unable_to_write_debugger_visualizer = Unable to write debugger visualizer file `{$path}`: {$error}
-
-codegen_ssa_rlib_archive_build_failure = failed to build archive from rlib: {$error}
-
-codegen_ssa_option_gcc_only = option `-Z gcc-ld` is used even though linker flavor is not gcc
-
-codegen_ssa_extract_bundled_libs_open_file = failed to open file '{$rlib}': {$error}
-codegen_ssa_extract_bundled_libs_mmap_file = failed to mmap file '{$rlib}': {$error}
-codegen_ssa_extract_bundled_libs_parse_archive = failed to parse archive '{$rlib}': {$error}
-codegen_ssa_extract_bundled_libs_read_entry = failed to read entry '{$rlib}': {$error}
-codegen_ssa_extract_bundled_libs_archive_member = failed to get data from archive member '{$rlib}': {$error}
-codegen_ssa_extract_bundled_libs_convert_name = failed to convert name '{$rlib}': {$error}
-codegen_ssa_extract_bundled_libs_write_file = failed to write file '{$rlib}': {$error}
-
-codegen_ssa_unsupported_arch = unsupported arch `{$arch}` for os `{$os}`
-
-codegen_ssa_apple_sdk_error_sdk_path = failed to get {$sdk_name} SDK path: {$error}
-
-codegen_ssa_read_file = failed to read file: {$message}
-
-codegen_ssa_unsupported_link_self_contained = option `-C link-self-contained` is not supported on this target
-
-codegen_ssa_archive_build_failure =
-    failed to build archive: {$error}
-
-codegen_ssa_unknown_archive_kind =
-    Don't know how to build archive of type: {$kind}
-
-codegen_ssa_expected_used_symbol = expected `used`, `used(compiler)` or `used(linker)`
-
-codegen_ssa_multiple_main_functions = entry symbol `main` declared multiple times
-    .help = did you use `#[no_mangle]` on `fn main`? Use `#[start]` instead
-
-codegen_ssa_metadata_object_file_write = error writing metadata object file: {$error}
-
-codegen_ssa_invalid_windows_subsystem = invalid windows subsystem `{$subsystem}`, only `windows` and `console` are allowed
-
-codegen_ssa_erroneous_constant = erroneous constant encountered
-
-codegen_ssa_shuffle_indices_evaluation = could not evaluate shuffle_indices at compile time
-
-codegen_ssa_missing_memory_ordering = Atomic intrinsic missing memory ordering
-
-codegen_ssa_unknown_atomic_ordering = unknown ordering in atomic intrinsic
-
-codegen_ssa_atomic_compare_exchange = Atomic compare-exchange intrinsic missing failure memory ordering
-
-codegen_ssa_unknown_atomic_operation = unknown atomic operation
-
-codegen_ssa_invalid_monomorphization_basic_integer_type = invalid monomorphization of `{$name}` intrinsic: expected basic integer type, found `{$ty}`
-
-codegen_ssa_invalid_monomorphization_basic_float_type = invalid monomorphization of `{$name}` intrinsic: expected basic float type, found `{$ty}`
-
-codegen_ssa_invalid_monomorphization_float_to_int_unchecked = invalid monomorphization of `float_to_int_unchecked` intrinsic: expected basic float type, found `{$ty}`
-
-codegen_ssa_invalid_monomorphization_floating_point_vector = invalid monomorphization of `{$name}` intrinsic: unsupported element type `{$f_ty}` of floating-point vector `{$in_ty}`
-
-codegen_ssa_invalid_monomorphization_floating_point_type = invalid monomorphization of `{$name}` intrinsic: `{$in_ty}` is not a floating-point type
-
-codegen_ssa_invalid_monomorphization_unrecognized_intrinsic = invalid monomorphization of `{$name}` intrinsic: unrecognized intrinsic `{$name}`
-
-codegen_ssa_invalid_monomorphization_simd_argument = invalid monomorphization of `{$name}` intrinsic: expected SIMD argument type, found non-SIMD `{$ty}`
-
-codegen_ssa_invalid_monomorphization_simd_input = invalid monomorphization of `{$name}` intrinsic: expected SIMD input type, found non-SIMD `{$ty}`
-
-codegen_ssa_invalid_monomorphization_simd_first = invalid monomorphization of `{$name}` intrinsic: expected SIMD first type, found non-SIMD `{$ty}`
-
-codegen_ssa_invalid_monomorphization_simd_second = invalid monomorphization of `{$name}` intrinsic: expected SIMD second type, found non-SIMD `{$ty}`
-
-codegen_ssa_invalid_monomorphization_simd_third = invalid monomorphization of `{$name}` intrinsic: expected SIMD third type, found non-SIMD `{$ty}`
-
-codegen_ssa_invalid_monomorphization_simd_return = invalid monomorphization of `{$name}` intrinsic: expected SIMD return type, found non-SIMD `{$ty}`
-
-codegen_ssa_invalid_monomorphization_invalid_bitmask = invalid monomorphization of `{$name}` intrinsic: invalid bitmask `{$mask_ty}`, expected `u{$expected_int_bits}` or `[u8; {$expected_bytes}]`
-
-codegen_ssa_polymorphic_constant_too_generic = codegen encountered polymorphic constant: TooGeneric
-
-codegen_ssa_invalid_monomorphization_return_length_input_type = invalid monomorphization of `{$name}` intrinsic: expected return type with length {$in_len} (same as input type `{$in_ty}`), found `{$ret_ty}` with length {$out_len}
-
-codegen_ssa_invalid_monomorphization_second_argument_length = invalid monomorphization of `{$name}` intrinsic: expected second argument with length {$in_len} (same as input type `{$in_ty}`), found `{$arg_ty}` with length {$out_len}
-
-codegen_ssa_invalid_monomorphization_third_argument_length = invalid monomorphization of `{$name}` intrinsic: expected third argument with length {$in_len} (same as input type `{$in_ty}`), found `{$arg_ty}` with length {$out_len}
-
-codegen_ssa_invalid_monomorphization_return_integer_type = invalid monomorphization of `{$name}` intrinsic: expected return type with integer elements, found `{$ret_ty}` with non-integer `{$out_ty}`
-
-codegen_ssa_invalid_monomorphization_simd_shuffle = invalid monomorphization of `{$name}` intrinsic: simd_shuffle index must be an array of `u32`, got `{$ty}`
-
-codegen_ssa_invalid_monomorphization_return_length = invalid monomorphization of `{$name}` intrinsic: expected return type of length {$in_len}, found `{$ret_ty}` with length {$out_len}
-
-codegen_ssa_invalid_monomorphization_return_element = invalid monomorphization of `{$name}` intrinsic: expected return element type `{$in_elem}` (element of input `{$in_ty}`), found `{$ret_ty}` with element type `{$out_ty}`
-
-codegen_ssa_invalid_monomorphization_shuffle_index_not_constant = invalid monomorphization of `{$name}` intrinsic: shuffle index #{$arg_idx} is not a constant
-
-codegen_ssa_invalid_monomorphization_shuffle_index_out_of_bounds = invalid monomorphization of `{$name}` intrinsic: shuffle index #{$arg_idx} is out of bounds (limit {$total_len})
-
-codegen_ssa_invalid_monomorphization_inserted_type = invalid monomorphization of `{$name}` intrinsic: expected inserted type `{$in_elem}` (element of input `{$in_ty}`), found `{$out_ty}`
-
-codegen_ssa_invalid_monomorphization_return_type = invalid monomorphization of `{$name}` intrinsic: expected return type `{$in_elem}` (element of input `{$in_ty}`), found `{$ret_ty}`
-
-codegen_ssa_invalid_monomorphization_expected_return_type = invalid monomorphization of `{$name}` intrinsic: expected return type `{$in_ty}`, found `{$ret_ty}`
-
-codegen_ssa_invalid_monomorphization_mismatched_lengths = invalid monomorphization of `{$name}` intrinsic: mismatched lengths: mask length `{$m_len}` != other vector length `{$v_len}`
-
-codegen_ssa_invalid_monomorphization_mask_type = invalid monomorphization of `{$name}` intrinsic: mask element type is `{$ty}`, expected `i_`
-
-codegen_ssa_invalid_monomorphization_vector_argument = invalid monomorphization of `{$name}` intrinsic: vector argument `{$in_ty}`'s element type `{$in_elem}`, expected integer element type
-
-codegen_ssa_invalid_monomorphization_cannot_return = invalid monomorphization of `{$name}` intrinsic: cannot return `{$ret_ty}`, expected `u{$expected_int_bits}` or `[u8; {$expected_bytes}]`
-
-codegen_ssa_invalid_monomorphization_expected_element_type = invalid monomorphization of `{$name}` intrinsic: expected element type `{$expected_element}` of second argument `{$second_arg}` to be a pointer to the element type `{$in_elem}` of the first argument `{$in_ty}`, found `{$expected_element}` != `{$mutability} {$in_elem}`
-
-codegen_ssa_invalid_monomorphization_third_arg_element_type = invalid monomorphization of `{$name}` intrinsic: expected element type `{$expected_element}` of third argument `{$third_arg}` to be a signed integer type
-
-codegen_ssa_invalid_monomorphization_unsupported_symbol_of_size = invalid monomorphization of `{$name}` intrinsic: unsupported {$symbol} from `{$in_ty}` with element `{$in_elem}` of size `{$size}` to `{$ret_ty}`
-
-codegen_ssa_invalid_monomorphization_unsupported_symbol = invalid monomorphization of `{$name}` intrinsic: unsupported {$symbol} from `{$in_ty}` with element `{$in_elem}` to `{$ret_ty}`
-
-codegen_ssa_invalid_monomorphization_cast_fat_pointer = invalid monomorphization of `{$name}` intrinsic: cannot cast fat pointer `{$ty}`
-
-codegen_ssa_invalid_monomorphization_expected_pointer = invalid monomorphization of `{$name}` intrinsic: expected pointer, got `{$ty}`
-
-codegen_ssa_invalid_monomorphization_expected_usize = invalid monomorphization of `{$name}` intrinsic: expected `usize`, got `{$ty}`
-
-codegen_ssa_invalid_monomorphization_unsupported_cast = invalid monomorphization of `{$name}` intrinsic: unsupported cast from `{$in_ty}` with element `{$in_elem}` to `{$ret_ty}` with element `{$out_elem}`
-
-codegen_ssa_invalid_monomorphization_unsupported_operation = invalid monomorphization of `{$name}` intrinsic: unsupported operation on `{$in_ty}` with element `{$in_elem}`
-
-codegen_ssa_invalid_monomorphization_expected_vector_element_type = invalid monomorphization of `{$name}` intrinsic: expected element type `{$expected_element}` of vector type `{$vector_type}` to be a signed or unsigned integer type
diff --git a/compiler/rustc_error_messages/locales/en-US/compiletest.ftl b/compiler/rustc_error_messages/locales/en-US/compiletest.ftl
deleted file mode 100644
index 55061fbce7e..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/compiletest.ftl
+++ /dev/null
@@ -1,5 +0,0 @@
-compiletest_example = this is an example message used in testing
-    .note = with a note
-    .help = with a help
-    .suggestion = with a suggestion
-    .label = with a label
diff --git a/compiler/rustc_error_messages/locales/en-US/const_eval.ftl b/compiler/rustc_error_messages/locales/en-US/const_eval.ftl
deleted file mode 100644
index 33bb116d6fa..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/const_eval.ftl
+++ /dev/null
@@ -1,83 +0,0 @@
-const_eval_unstable_in_stable =
-    const-stable function cannot use `#[feature({$gate})]`
-    .unstable_sugg = if it is not part of the public API, make this function unstably const
-    .bypass_sugg = otherwise `#[rustc_allow_const_fn_unstable]` can be used to bypass stability checks
-
-const_eval_thread_local_access =
-    thread-local statics cannot be accessed at compile-time
-
-const_eval_static_access =
-    {$kind}s cannot refer to statics
-    .help = consider extracting the value of the `static` to a `const`, and referring to that
-    .teach_note = `static` and `const` variables can refer to other `const` variables. A `const` variable, however, cannot refer to a `static` variable.
-    .teach_help = To fix this, the value can be extracted to a `const` and then used.
-
-const_eval_raw_ptr_to_int =
-    pointers cannot be cast to integers during const eval
-    .note = at compile-time, pointers do not have an integer value
-    .note2 = avoiding this restriction via `transmute`, `union`, or raw pointers leads to compile-time undefined behavior
-
-const_eval_raw_ptr_comparison =
-    pointers cannot be reliably compared during const eval
-    .note = see issue #53020 <https://github.com/rust-lang/rust/issues/53020> for more information
-
-const_eval_panic_non_str = argument to `panic!()` in a const context must have type `&str`
-
-const_eval_mut_deref =
-    mutation through a reference is not allowed in {$kind}s
-
-const_eval_transient_mut_borrow = mutable references are not allowed in {$kind}s
-
-const_eval_transient_mut_borrow_raw = raw mutable references are not allowed in {$kind}s
-
-const_eval_max_num_nodes_in_const = maximum number of nodes exceeded in constant {$global_const_id}
-
-const_eval_unallowed_fn_pointer_call = function pointer calls are not allowed in {$kind}s
-
-const_eval_unstable_const_fn = `{$def_path}` is not yet stable as a const fn
-
-const_eval_unallowed_mutable_refs =
-    mutable references are not allowed in the final value of {$kind}s
-    .teach_note =
-        References in statics and constants may only refer to immutable values.\n\n
-        Statics are shared everywhere, and if they refer to mutable data one might violate memory
-        safety since holding multiple mutable references to shared data is not allowed.\n\n
-        If you really want global mutable state, try using static mut or a global UnsafeCell.
-
-const_eval_unallowed_mutable_refs_raw =
-    raw mutable references are not allowed in the final value of {$kind}s
-    .teach_note =
-        References in statics and constants may only refer to immutable values.\n\n
-        Statics are shared everywhere, and if they refer to mutable data one might violate memory
-        safety since holding multiple mutable references to shared data is not allowed.\n\n
-        If you really want global mutable state, try using static mut or a global UnsafeCell.
-
-const_eval_non_const_fmt_macro_call =
-    cannot call non-const formatting macro in {$kind}s
-
-const_eval_non_const_fn_call =
-    cannot call non-const fn `{$def_path_str}` in {$kind}s
-
-const_eval_unallowed_op_in_const_context =
-    {$msg}
-
-const_eval_unallowed_heap_allocations =
-    allocations are not allowed in {$kind}s
-    .label = allocation not allowed in {$kind}s
-    .teach_note =
-        The value of statics and constants must be known at compile time, and they live for the entire lifetime of a program. Creating a boxed value allocates memory on the heap at runtime, and therefore cannot be done at compile time.
-
-const_eval_unallowed_inline_asm =
-    inline assembly is not allowed in {$kind}s
-
-const_eval_interior_mutable_data_refer =
-    {$kind}s cannot refer to interior mutable data
-    .label = this borrow of an interior mutable value may end up in the final value
-    .help = to fix this, the value can be extracted to a separate `static` item and then referenced
-    .teach_note =
-        A constant containing interior mutable data behind a reference can allow you to modify that data.
-        This would make multiple uses of a constant to be able to see different values and allow circumventing
-        the `Send` and `Sync` requirements for shared mutable data, which is unsound.
-
-const_eval_interior_mutability_borrow =
-    cannot borrow here, since the borrowed element may contain interior mutability
diff --git a/compiler/rustc_error_messages/locales/en-US/driver.ftl b/compiler/rustc_error_messages/locales/en-US/driver.ftl
deleted file mode 100644
index f19b1ff6426..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/driver.ftl
+++ /dev/null
@@ -1,19 +0,0 @@
-driver_impl_rlink_unable_to_read = failed to read rlink file: `{$err}`
-
-driver_impl_rlink_wrong_file_type = The input does not look like a .rlink file
-
-driver_impl_rlink_empty_version_number = The input does not contain version number
-
-driver_impl_rlink_encoding_version_mismatch = .rlink file was produced with encoding version `{$version_array}`, but the current version is `{$rlink_version}`
-
-driver_impl_rlink_rustc_version_mismatch = .rlink file was produced by rustc version `{$rustc_version}`, but the current version is `{$current_version}`
-
-driver_impl_rlink_no_a_file = rlink must be a file
-
-driver_impl_unpretty_dump_fail = pretty-print failed to write `{$path}` due to error `{$err}`
-
-driver_impl_ice = the compiler unexpectedly panicked. this is a bug.
-driver_impl_ice_bug_report = we would appreciate a bug report: {$bug_report_url}
-driver_impl_ice_version = rustc {$version} running on {$triple}
-driver_impl_ice_flags = compiler flags: {$flags}
-driver_impl_ice_exclude_cargo_defaults = some of the compiler flags provided by cargo are hidden
diff --git a/compiler/rustc_error_messages/locales/en-US/errors.ftl b/compiler/rustc_error_messages/locales/en-US/errors.ftl
deleted file mode 100644
index 429bdd2777f..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/errors.ftl
+++ /dev/null
@@ -1,13 +0,0 @@
-errors_target_invalid_address_space = invalid address space `{$addr_space}` for `{$cause}` in "data-layout": {$err}
-
-errors_target_invalid_bits = invalid {$kind} `{$bit}` for `{$cause}` in "data-layout": {$err}
-
-errors_target_missing_alignment = missing alignment for `{$cause}` in "data-layout"
-
-errors_target_invalid_alignment = invalid alignment for `{$cause}` in "data-layout": {$err}
-
-errors_target_inconsistent_architecture = inconsistent target specification: "data-layout" claims architecture is {$dl}-endian, while "target-endian" is `{$target}`
-
-errors_target_inconsistent_pointer_width = inconsistent target specification: "data-layout" claims pointers are {$pointer_size}-bit, while "target-pointer-width" is `{$target}`
-
-errors_target_invalid_bits_size = {$err}
diff --git a/compiler/rustc_error_messages/locales/en-US/expand.ftl b/compiler/rustc_error_messages/locales/en-US/expand.ftl
deleted file mode 100644
index dbd80954382..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/expand.ftl
+++ /dev/null
@@ -1,131 +0,0 @@
-expand_explain_doc_comment_outer =
-    outer doc comments expand to `#[doc = "..."]`, which is what this macro attempted to match
-
-expand_explain_doc_comment_inner =
-    inner doc comments expand to `#![doc = "..."]`, which is what this macro attempted to match
-
-expand_expr_repeat_no_syntax_vars =
-    attempted to repeat an expression containing no syntax variables matched as repeating at this depth
-
-expand_must_repeat_once =
-    this must repeat at least once
-
-expand_count_repetition_misplaced =
-    `count` can not be placed inside the inner-most repetition
-
-expand_meta_var_expr_unrecognized_var =
-    variable `{$key}` is not recognized in meta-variable expression
-
-expand_var_still_repeating =
-    variable '{$ident}' is still repeating at this depth
-
-expand_meta_var_dif_seq_matchers = {$msg}
-
-expand_macro_const_stability =
-    macros cannot have const stability attributes
-    .label = invalid const stability attribute
-    .label2 = const stability attribute affects this macro
-
-expand_macro_body_stability =
-    macros cannot have body stability attributes
-    .label = invalid body stability attribute
-    .label2 = body stability attribute affects this macro
-
-expand_resolve_relative_path =
-    cannot resolve relative path in non-file source `{$path}`
-
-expand_attr_no_arguments =
-    attribute must have either one or two arguments
-
-expand_not_a_meta_item =
-    not a meta item
-
-expand_only_one_word =
-    must only be one word
-
-expand_cannot_be_name_of_macro =
-    `{$trait_ident}` cannot be a name of {$macro_type} macro
-
-expand_arg_not_attributes =
-    second argument must be `attributes`
-
-expand_attributes_wrong_form =
-    attribute must be of form: `attributes(foo, bar)`
-
-expand_attribute_meta_item =
-    attribute must be a meta item, not a literal
-
-expand_attribute_single_word =
-    attribute must only be a single word
-
-expand_helper_attribute_name_invalid =
-    `{$name}` cannot be a name of derive helper attribute
-
-expand_expected_comma_in_list =
-    expected token: `,`
-
-expand_only_one_argument =
-    {$name} takes 1 argument
-
-expand_takes_no_arguments =
-    {$name} takes no arguments
-
-expand_feature_included_in_edition =
-    the feature `{$feature}` is included in the Rust {$edition} edition
-
-expand_feature_removed =
-    feature has been removed
-    .label = feature has been removed
-    .reason = {$reason}
-
-expand_feature_not_allowed =
-    the feature `{$name}` is not in the list of allowed features
-
-expand_recursion_limit_reached =
-    recursion limit reached while expanding `{$descr}`
-    .help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
-
-expand_malformed_feature_attribute =
-    malformed `feature` attribute input
-    .expected = expected just one word
-
-expand_remove_expr_not_supported =
-    removing an expression is not supported in this position
-
-expand_invalid_cfg_no_parens = `cfg` is not followed by parentheses
-expand_invalid_cfg_no_predicate = `cfg` predicate is not specified
-expand_invalid_cfg_multiple_predicates = multiple `cfg` predicates are specified
-expand_invalid_cfg_predicate_literal = `cfg` predicate key cannot be a literal
-expand_invalid_cfg_expected_syntax = expected syntax is
-
-expand_wrong_fragment_kind =
-    non-{$kind} macro in {$kind} position: {$name}
-
-expand_unsupported_key_value =
-    key-value macro attributes are not supported
-
-expand_incomplete_parse =
-    macro expansion ignores token `{$token}` and any following
-    .label = caused by the macro expansion here
-    .note = the usage of `{$macro_path}!` is likely invalid in {$kind_name} context
-    .suggestion_add_semi = you might be missing a semicolon here
-
-expand_remove_node_not_supported =
-    removing {$descr} is not supported in this position
-
-expand_module_circular =
-    circular modules: {$modules}
-
-expand_module_in_block =
-    cannot declare a non-inline module inside a block unless it has a path attribute
-    .note = maybe `use` the module `{$name}` instead of redeclaring it
-
-expand_module_file_not_found =
-    file not found for module `{$name}`
-    .help = to create the module `{$name}`, create file "{$default_path}" or "{$secondary_path}"
-
-expand_module_multiple_candidates =
-    file for module `{$name}` found at both "{$default_path}" and "{$secondary_path}"
-    .help = delete or rename one of them to remove the ambiguity
-
-expand_trace_macro = trace_macro
diff --git a/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl b/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl
deleted file mode 100644
index f8d28817fec..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl
+++ /dev/null
@@ -1,129 +0,0 @@
-hir_analysis_unrecognized_atomic_operation =
-    unrecognized atomic operation function: `{$op}`
-    .label = unrecognized atomic operation
-
-hir_analysis_wrong_number_of_generic_arguments_to_intrinsic =
-    intrinsic has wrong number of {$descr} parameters: found {$found}, expected {$expected}
-    .label = expected {$expected} {$descr} {$expected ->
-        [one] parameter
-        *[other] parameters
-    }
-
-hir_analysis_unrecognized_intrinsic_function =
-    unrecognized intrinsic function: `{$name}`
-    .label = unrecognized intrinsic
-
-hir_analysis_lifetimes_or_bounds_mismatch_on_trait =
-    lifetime parameters or bounds on {$item_kind} `{$ident}` do not match the trait declaration
-    .label = lifetimes do not match {$item_kind} in trait
-    .generics_label = lifetimes in impl do not match this {$item_kind} in trait
-    .where_label = this `where` clause might not match the one in the trait
-    .bounds_label = this bound might be missing in the impl
-
-hir_analysis_async_trait_impl_should_be_async =
-    method `{$method_name}` should be async because the method from the trait is async
-    .trait_item_label = required because the trait method is async
-
-hir_analysis_drop_impl_on_wrong_item =
-    the `Drop` trait may only be implemented for local structs, enums, and unions
-    .label = must be a struct, enum, or union in the current crate
-
-hir_analysis_field_already_declared =
-    field `{$field_name}` is already declared
-    .label = field already declared
-    .previous_decl_label = `{$field_name}` first declared here
-
-hir_analysis_copy_impl_on_type_with_dtor =
-    the trait `Copy` may not be implemented for this type; the type has a destructor
-    .label = `Copy` not allowed on types with destructors
-
-hir_analysis_multiple_relaxed_default_bounds =
-    type parameter has more than one relaxed default bound, only one is supported
-
-hir_analysis_copy_impl_on_non_adt =
-    the trait `Copy` may not be implemented for this type
-    .label = type is not a structure or enumeration
-
-hir_analysis_trait_object_declared_with_no_traits =
-    at least one trait is required for an object type
-    .alias_span = this alias does not contain a trait
-
-hir_analysis_ambiguous_lifetime_bound =
-    ambiguous lifetime bound, explicit lifetime bound required
-
-hir_analysis_assoc_type_binding_not_allowed =
-    associated type bindings are not allowed here
-    .label = associated type not allowed here
-
-hir_analysis_typeof_reserved_keyword_used =
-    `typeof` is a reserved keyword but unimplemented
-    .suggestion = consider replacing `typeof(...)` with an actual type
-    .label = reserved keyword
-
-hir_analysis_value_of_associated_struct_already_specified =
-    the value of the associated type `{$item_name}` (from trait `{$def_path}`) is already specified
-    .label = re-bound here
-    .previous_bound_label = `{$item_name}` bound here first
-
-hir_analysis_unconstrained_opaque_type = unconstrained opaque type
-    .note = `{$name}` must be used in combination with a concrete type within the same {$what}
-
-hir_analysis_missing_type_params =
-    the type {$parameterCount ->
-        [one] parameter
-        *[other] parameters
-    } {$parameters} must be explicitly specified
-    .label = type {$parameterCount ->
-        [one] parameter
-        *[other] parameters
-    } {$parameters} must be specified for this
-    .suggestion = set the type {$parameterCount ->
-        [one] parameter
-        *[other] parameters
-    } to the desired {$parameterCount ->
-        [one] type
-        *[other] types
-    }
-    .no_suggestion_label = missing {$parameterCount ->
-        [one] reference
-        *[other] references
-    } to {$parameters}
-    .note = because of the default `Self` reference, type parameters must be specified on object types
-
-hir_analysis_manual_implementation =
-    manual implementations of `{$trait_name}` are experimental
-    .label = manual implementations of `{$trait_name}` are experimental
-    .help = add `#![feature(unboxed_closures)]` to the crate attributes to enable
-
-hir_analysis_substs_on_overridden_impl = could not resolve substs on overridden impl
-
-hir_analysis_unused_extern_crate =
-    unused extern crate
-    .suggestion = remove it
-
-hir_analysis_extern_crate_not_idiomatic =
-    `extern crate` is not idiomatic in the new edition
-    .suggestion = convert it to a `{$msg_code}`
-
-hir_analysis_const_impl_for_non_const_trait =
-    const `impl` for trait `{$trait_name}` which is not marked with `#[const_trait]`
-    .suggestion = mark `{$trait_name}` as const
-    .note = marking a trait with `#[const_trait]` ensures all default method bodies are `const`
-    .adding = adding a non-const method body in the future would be a breaking change
-
-hir_analysis_const_bound_for_non_const_trait =
-    ~const can only be applied to `#[const_trait]` traits
-
-hir_analysis_self_in_impl_self =
-    `Self` is not valid in the self type of an impl block
-    .note = replace `Self` with a different type
-
-hir_analysis_linkage_type =
-    invalid type for variable with `#[linkage]` attribute
-
-hir_analysis_auto_deref_reached_recursion_limit = reached the recursion limit while auto-dereferencing `{$ty}`
-    .label = deref recursion limit reached
-    .help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
-
-hir_analysis_track_caller_on_main = `main` function is not allowed to be `#[track_caller]`
-    .label = `main` function is not allowed to be `#[track_caller]`
diff --git a/compiler/rustc_error_messages/locales/en-US/hir_typeck.ftl b/compiler/rustc_error_messages/locales/en-US/hir_typeck.ftl
deleted file mode 100644
index 05ac8db0db8..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/hir_typeck.ftl
+++ /dev/null
@@ -1,65 +0,0 @@
-hir_typeck_fru_note = this expression may have been misinterpreted as a `..` range expression
-hir_typeck_fru_expr = this expression does not end in a comma...
-hir_typeck_fru_expr2 = ... so this is interpreted as a `..` range expression, instead of functional record update syntax
-hir_typeck_fru_suggestion =
-    to set the remaining fields{$expr ->
-        [NONE]{""}
-        *[other] {" "}from `{$expr}`
-    }, separate the last named field with a comma
-
-hir_typeck_field_multiply_specified_in_initializer =
-    field `{$ident}` specified more than once
-    .label = used more than once
-    .previous_use_label = first use of `{$ident}`
-
-hir_typeck_return_stmt_outside_of_fn_body =
-    return statement outside of function body
-    .encl_body_label = the return is part of this body...
-    .encl_fn_label = ...not the enclosing function body
-
-hir_typeck_yield_expr_outside_of_generator =
-    yield expression outside of generator literal
-
-hir_typeck_struct_expr_non_exhaustive =
-    cannot create non-exhaustive {$what} using struct expression
-
-hir_typeck_method_call_on_unknown_type =
-    the type of this value must be known to call a method on a raw pointer on it
-
-hir_typeck_functional_record_update_on_non_struct =
-    functional record update syntax requires a struct
-
-hir_typeck_address_of_temporary_taken = cannot take address of a temporary
-    .label = temporary value
-
-hir_typeck_add_return_type_add = try adding a return type
-
-hir_typeck_add_return_type_missing_here = a return type might be missing here
-
-hir_typeck_expected_default_return_type = expected `()` because of default return type
-
-hir_typeck_expected_return_type = expected `{$expected}` because of return type
-
-hir_typeck_missing_parentheses_in_range = can't call method `{$method_name}` on type `{$ty_str}`
-
-hir_typeck_add_missing_parentheses_in_range = you must surround the range in parentheses to call its `{$func_name}` function
-
-hir_typeck_op_trait_generic_params =
-    `{$method_name}` must not have any generic parameters
-
-hir_typeck_lang_start_incorrect_number_params = incorrect number of parameters for the `start` lang item
-hir_typeck_lang_start_incorrect_number_params_note_expected_count = the `start` lang item should have four parameters, but found {$found_param_count}
-
-hir_typeck_lang_start_expected_sig_note = the `start` lang item should have the signature `fn(fn() -> T, isize, *const *const u8, u8) -> isize`
-
-hir_typeck_lang_start_incorrect_param = parameter {$param_num} of the `start` lang item is incorrect
-    .suggestion = change the type from `{$found_ty}` to `{$expected_ty}`
-
-hir_typeck_lang_start_incorrect_ret_ty = the return type of the `start` lang item is incorrect
-    .suggestion = change the type from `{$found_ty}` to `{$expected_ty}`
-
-hir_typeck_help_set_edition_cargo = set `edition = "{$edition}"` in `Cargo.toml`
-hir_typeck_help_set_edition_standalone = pass `--edition {$edition}` to `rustc`
-hir_typeck_note_edition_guide = for more on editions, read https://doc.rust-lang.org/edition-guide
-
-hir_typeck_convert_to_str = try converting the passed type into a `&str`
diff --git a/compiler/rustc_error_messages/locales/en-US/incremental.ftl b/compiler/rustc_error_messages/locales/en-US/incremental.ftl
deleted file mode 100644
index 4852ee0d959..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/incremental.ftl
+++ /dev/null
@@ -1,118 +0,0 @@
-incremental_unrecognized_depnode = unrecognized `DepNode` variant: {$name}
-
-incremental_missing_depnode = missing `DepNode` variant
-
-incremental_missing_if_this_changed = no `#[rustc_if_this_changed]` annotation detected
-
-incremental_no_path = no path from `{$source}` to `{$target}`
-
-incremental_ok = OK
-
-incremental_unknown_reuse_kind = unknown cgu-reuse-kind `{$kind}` specified
-
-incremental_missing_query_depgraph =
-    found CGU-reuse attribute but `-Zquery-dep-graph` was not specified
-
-incremental_malformed_cgu_name =
-    found malformed codegen unit name `{$user_path}`. codegen units names must always start with the name of the crate (`{$crate_name}` in this case).
-
-incremental_no_module_named =
-    no module named `{$user_path}` (mangled: {$cgu_name}). available modules: {$cgu_names}
-
-incremental_field_associated_value_expected = associated value expected for `{$name}`
-
-incremental_no_field = no field `{$name}`
-
-incremental_assertion_auto =
-    `except` specified DepNodes that can not be affected for \"{$name}\": \"{$e}\"
-
-incremental_undefined_clean_dirty_assertions_item =
-    clean/dirty auto-assertions not yet defined for Node::Item.node={$kind}
-
-incremental_undefined_clean_dirty_assertions =
-    clean/dirty auto-assertions not yet defined for {$kind}
-
-incremental_repeated_depnode_label = dep-node label `{$label}` is repeated
-
-incremental_unrecognized_depnode_label = dep-node label `{$label}` not recognized
-
-incremental_not_dirty = `{$dep_node_str}` should be dirty but is not
-
-incremental_not_clean = `{$dep_node_str}` should be clean but is not
-
-incremental_not_loaded = `{$dep_node_str}` should have been loaded from disk but it was not
-
-incremental_unknown_item = unknown item `{$name}`
-
-incremental_no_cfg = no cfg attribute
-
-incremental_associated_value_expected_for = associated value expected for `{$ident}`
-
-incremental_associated_value_expected = expected an associated value
-
-incremental_unchecked_clean = found unchecked `#[rustc_clean]` attribute
-
-incremental_delete_old = unable to delete old {$name} at `{$path}`: {$err}
-
-incremental_create_new = failed to create {$name} at `{$path}`: {$err}
-
-incremental_write_new = failed to write {$name} to `{$path}`: {$err}
-
-incremental_canonicalize_path = incremental compilation: error canonicalizing path `{$path}`: {$err}
-
-incremental_create_incr_comp_dir =
-    could not create incremental compilation {$tag} directory `{$path}`: {$err}
-
-incremental_create_lock =
-    incremental compilation: could not create session directory lock file: {$lock_err}
-incremental_lock_unsupported =
-    the filesystem for the incremental path at {$session_dir} does not appear to support locking, consider changing the incremental path to a filesystem that supports locking or disable incremental compilation
-incremental_cargo_help_1 =
-    incremental compilation can be disabled by setting the environment variable CARGO_INCREMENTAL=0 (see https://doc.rust-lang.org/cargo/reference/profiles.html#incremental)
-incremental_cargo_help_2 =
-    the entire build directory can be changed to a different filesystem by setting the environment variable CARGO_TARGET_DIR to a different path (see https://doc.rust-lang.org/cargo/reference/config.html#buildtarget-dir)
-
-incremental_delete_lock =
-    error deleting lock file for incremental compilation session directory `{$path}`: {$err}
-
-incremental_hard_link_failed =
-    hard linking files in the incremental compilation cache failed. copying files instead. consider moving the cache directory to a file system which supports hard linking in session dir `{$path}`
-
-incremental_delete_partial = failed to delete partly initialized session dir `{$path}`: {$err}
-
-incremental_delete_full = error deleting incremental compilation session directory `{$path}`: {$err}
-
-incremental_finalize = error finalizing incremental compilation session directory `{$path}`: {$err}
-
-incremental_invalid_gc_failed =
-    failed to garbage collect invalid incremental compilation session directory `{$path}`: {$err}
-
-incremental_finalized_gc_failed =
-    failed to garbage collect finalized incremental compilation session directory `{$path}`: {$err}
-
-incremental_session_gc_failed =
-    failed to garbage collect incremental compilation session directory `{$path}`: {$err}
-
-incremental_assert_not_loaded =
-    we asserted that the incremental cache should not be loaded, but it was loaded
-
-incremental_assert_loaded =
-    we asserted that an existing incremental cache directory should be successfully loaded, but it was not
-
-incremental_delete_incompatible =
-    failed to delete invalidated or incompatible incremental compilation session directory contents `{$path}`: {$err}
-
-incremental_load_dep_graph = could not load dep-graph from `{$path}`: {$err}
-
-incremental_decode_incr_cache = could not decode incremental cache: {$err}
-
-incremental_write_dep_graph = failed to write dependency graph to `{$path}`: {$err}
-
-incremental_move_dep_graph = failed to move dependency graph from `{$from}` to `{$to}`: {$err}
-
-incremental_create_dep_graph = failed to create dependency graph at `{$path}`: {$err}
-
-incremental_copy_workproduct_to_cache =
-    error copying object file `{$from}` to incremental directory as `{$to}`: {$err}
-
-incremental_delete_workproduct = file-system error deleting outdated file `{$path}`: {$err}
diff --git a/compiler/rustc_error_messages/locales/en-US/infer.ftl b/compiler/rustc_error_messages/locales/en-US/infer.ftl
deleted file mode 100644
index c5b2b6c2d73..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/infer.ftl
+++ /dev/null
@@ -1,347 +0,0 @@
-infer_opaque_hidden_type =
-    opaque type's hidden type cannot be another opaque type from the same scope
-    .label = one of the two opaque types used here has to be outside its defining scope
-    .opaque_type = opaque type whose hidden type is being assigned
-    .hidden_type = opaque type being used as hidden type
-
-infer_type_annotations_needed = {$source_kind ->
-    [closure] type annotations needed for the closure `{$source_name}`
-    [normal] type annotations needed for `{$source_name}`
-    *[other] type annotations needed
-}
-    .label = type must be known at this point
-
-infer_label_bad = {$bad_kind ->
-    *[other] cannot infer type
-    [more_info] cannot infer {$prefix_kind ->
-        *[type] type for {$prefix}
-        [const_with_param] the value of const parameter
-        [const] the value of the constant
-    } `{$name}`{$has_parent ->
-        [true] {" "}declared on the {$parent_prefix} `{$parent_name}`
-        *[false] {""}
-    }
-}
-
-infer_source_kind_subdiag_let = {$kind ->
-    [with_pattern] consider giving `{$name}` an explicit type
-    [closure] consider giving this closure parameter an explicit type
-    *[other] consider giving this pattern a type
-}{$x_kind ->
-    [has_name] , where the {$prefix_kind ->
-        *[type] type for {$prefix}
-        [const_with_param] the value of const parameter
-        [const] the value of the constant
-    } `{$arg_name}` is specified
-    [underscore] , where the placeholders `_` are specified
-    *[empty] {""}
-}
-
-infer_source_kind_subdiag_generic_label =
-    cannot infer {$is_type ->
-    [true] type
-    *[false] the value
-    } of the {$is_type ->
-    [true] type
-    *[false] const
-    } {$parent_exists ->
-    [true] parameter `{$param_name}` declared on the {$parent_prefix} `{$parent_name}`
-    *[false] parameter {$param_name}
-    }
-
-infer_source_kind_subdiag_generic_suggestion =
-    consider specifying the generic {$arg_count ->
-    [one] argument
-    *[other] arguments
-    }
-
-infer_source_kind_fully_qualified =
-    try using a fully qualified path to specify the expected types
-
-infer_source_kind_closure_return =
-    try giving this closure an explicit return type
-
-# generator_kind  may need to be translated
-infer_need_type_info_in_generator =
-    type inside {$generator_kind ->
-    [async_block] `async` block
-    [async_closure] `async` closure
-    [async_fn] `async fn` body
-    *[generator] generator
-    } must be known in this context
-
-
-infer_subtype = ...so that the {$requirement ->
-    [method_compat] method type is compatible with trait
-    [type_compat] associated type is compatible with trait
-    [const_compat] const is compatible with trait
-    [expr_assignable] expression is assignable
-    [if_else_different] `if` and `else` have incompatible types
-    [no_else] `if` missing an `else` returns `()`
-    [fn_main_correct_type] `main` function has the correct type
-    [fn_start_correct_type] #[start]` function has the correct type
-    [intristic_correct_type] intrinsic has the correct type
-    [method_correct_type] method receiver has the correct type
-    *[other] types are compatible
-}
-infer_subtype_2 = ...so that {$requirement ->
-    [method_compat] method type is compatible with trait
-    [type_compat] associated type is compatible with trait
-    [const_compat] const is compatible with trait
-    [expr_assignable] expression is assignable
-    [if_else_different] `if` and `else` have incompatible types
-    [no_else] `if` missing an `else` returns `()`
-    [fn_main_correct_type] `main` function has the correct type
-    [fn_start_correct_type] #[start]` function has the correct type
-    [intristic_correct_type] intrinsic has the correct type
-    [method_correct_type] method receiver has the correct type
-    *[other] types are compatible
-}
-
-infer_reborrow = ...so that reference does not outlive borrowed content
-infer_reborrow_upvar = ...so that closure can access `{$name}`
-infer_relate_object_bound = ...so that it can be closed over into an object
-infer_reference_outlives_referent = ...so that the reference type `{$name}` does not outlive the data it points at
-infer_relate_param_bound = ...so that the type `{$name}` will meet its required lifetime bounds{$continues ->
-    [true] ...
-    *[false] {""}
-}
-infer_relate_param_bound_2 = ...that is required by this bound
-infer_relate_region_param_bound = ...so that the declared lifetime parameter bounds are satisfied
-infer_compare_impl_item_obligation = ...so that the definition in impl matches the definition from the trait
-infer_ascribe_user_type_prove_predicate = ...so that the where clause holds
-
-infer_nothing = {""}
-
-infer_lifetime_mismatch = lifetime mismatch
-
-infer_declared_different = this parameter and the return type are declared with different lifetimes...
-infer_data_returned = ...but data{$label_var1_exists ->
-    [true] {" "}from `{$label_var1}`
-    *[false] {""}
-} is returned here
-
-infer_data_lifetime_flow = ...but data with one lifetime flows into the other here
-infer_declared_multiple = this type is declared with multiple lifetimes...
-infer_types_declared_different = these two types are declared with different lifetimes...
-infer_data_flows = ...but data{$label_var1_exists ->
-    [true] {" "}from `{$label_var1}`
-    *[false] -> {""}
-} flows{$label_var2_exists ->
-    [true] {" "}into `{$label_var2}`
-    *[false] -> {""}
-} here
-
-infer_lifetime_param_suggestion = consider introducing a named lifetime parameter{$is_impl ->
-    [true] {" "}and update trait if needed
-    *[false] {""}
-}
-infer_lifetime_param_suggestion_elided = each elided lifetime in input position becomes a distinct lifetime
-
-infer_region_explanation = {$pref_kind ->
-    *[should_not_happen] [{$pref_kind}]
-    [ref_valid_for] ...the reference is valid for
-    [content_valid_for] ...but the borrowed content is only valid for
-    [type_obj_valid_for] object type is valid for
-    [source_pointer_valid_for] source pointer is only valid for
-    [type_satisfy] type must satisfy
-    [type_outlive] type must outlive
-    [lf_param_instantiated_with] lifetime parameter instantiated with
-    [lf_param_must_outlive] but lifetime parameter must outlive
-    [lf_instantiated_with] lifetime instantiated with
-    [lf_must_outlive] but lifetime must outlive
-    [pointer_valid_for] the pointer is valid for
-    [data_valid_for] but the referenced data is only valid for
-    [empty] {""}
-}{$pref_kind ->
-    [empty] {""}
-    *[other] {" "}
-}{$desc_kind ->
-    *[should_not_happen] [{$desc_kind}]
-    [restatic] the static lifetime
-    [revar] lifetime {$desc_arg}
-    [as_defined] the lifetime `{$desc_arg}` as defined here
-    [as_defined_anon] the anonymous lifetime as defined here
-    [defined_here] the anonymous lifetime defined here
-    [anon_num_here] the anonymous lifetime #{$desc_num_arg} defined here
-    [defined_here_reg] the lifetime `{$desc_arg}` as defined here
-}{$suff_kind ->
-    *[should_not_happen] [{$suff_kind}]
-    [empty]{""}
-    [continues] ...
-    [req_by_binding] {" "}as required by this binding
-}
-
-infer_outlives_content = lifetime of reference outlives lifetime of borrowed content...
-infer_outlives_bound = lifetime of the source pointer does not outlive lifetime bound of the object type
-infer_fullfill_req_lifetime = the type `{$ty}` does not fulfill the required lifetime
-infer_lf_bound_not_satisfied = lifetime bound not satisfied
-infer_borrowed_too_long = a value of type `{$ty}` is borrowed for too long
-infer_ref_longer_than_data = in type `{$ty}`, reference has a longer lifetime than the data it references
-
-infer_mismatched_static_lifetime = incompatible lifetime on type
-infer_does_not_outlive_static_from_impl = ...does not necessarily outlive the static lifetime introduced by the compatible `impl`
-infer_implicit_static_lifetime_note = this has an implicit `'static` lifetime requirement
-infer_implicit_static_lifetime_suggestion = consider relaxing the implicit `'static` requirement
-infer_msl_introduces_static = introduces a `'static` lifetime requirement
-infer_msl_unmet_req = because this has an unmet lifetime requirement
-infer_msl_trait_note = this has an implicit `'static` lifetime requirement
-infer_msl_trait_sugg = consider relaxing the implicit `'static` requirement
-infer_suggest_add_let_for_letchains = consider adding `let`
-
-infer_explicit_lifetime_required_with_ident = explicit lifetime required in the type of `{$simple_ident}`
-    .label = lifetime `{$named}` required
-
-infer_explicit_lifetime_required_with_param_type = explicit lifetime required in parameter type
-    .label = lifetime `{$named}` required
-
-infer_explicit_lifetime_required_sugg_with_ident = add explicit lifetime `{$named}` to the type of `{$simple_ident}`
-
-infer_explicit_lifetime_required_sugg_with_param_type = add explicit lifetime `{$named}` to type
-
-infer_actual_impl_expl_expected_signature_two = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`, for any two lifetimes `'{$lifetime_1}` and `'{$lifetime_2}`...
-infer_actual_impl_expl_expected_signature_any = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`, for any lifetime `'{$lifetime_1}`...
-infer_actual_impl_expl_expected_signature_some = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`, for some specific lifetime `'{$lifetime_1}`...
-infer_actual_impl_expl_expected_signature_nothing = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`
-infer_actual_impl_expl_expected_passive_two = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`, for any two lifetimes `'{$lifetime_1}` and `'{$lifetime_2}`...
-infer_actual_impl_expl_expected_passive_any = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`, for any lifetime `'{$lifetime_1}`...
-infer_actual_impl_expl_expected_passive_some = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`, for some specific lifetime `'{$lifetime_1}`...
-infer_actual_impl_expl_expected_passive_nothing = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`
-infer_actual_impl_expl_expected_other_two = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}`{$ty_or_sig}` must implement `{$trait_path}`, for any two lifetimes `'{$lifetime_1}` and `'{$lifetime_2}`...
-infer_actual_impl_expl_expected_other_any = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}`{$ty_or_sig}` must implement `{$trait_path}`, for any lifetime `'{$lifetime_1}`...
-infer_actual_impl_expl_expected_other_some = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}`{$ty_or_sig}` must implement `{$trait_path}`, for some specific lifetime `'{$lifetime_1}`...
-infer_actual_impl_expl_expected_other_nothing = {$leading_ellipsis ->
-    [true] ...
-    *[false] {""}
-}`{$ty_or_sig}` must implement `{$trait_path}`
-
-infer_actual_impl_expl_but_actually_implements_trait = ...but it actually implements `{$trait_path}`{$has_lifetime ->
-    [true] , for some specific lifetime `'{$lifetime}`
-    *[false] {""}
-}
-infer_actual_impl_expl_but_actually_implemented_for_ty = ...but `{$trait_path}` is actually implemented for the type `{$ty}`{$has_lifetime ->
-    [true] , for some specific lifetime `'{$lifetime}`
-    *[false] {""}
-}
-infer_actual_impl_expl_but_actually_ty_implements = ...but `{$ty}` actually implements `{$trait_path}`{$has_lifetime ->
-    [true] , for some specific lifetime `'{$lifetime}`
-    *[false] {""}
-}
-
-infer_trait_placeholder_mismatch = implementation of `{$trait_def_id}` is not general enough
-    .label_satisfy = doesn't satisfy where-clause
-    .label_where = due to a where-clause on `{$def_id}`...
-    .label_dup = implementation of `{$trait_def_id}` is not general enough
-
-infer_trait_impl_diff = `impl` item signature doesn't match `trait` item signature
-    .found = found `{$found}`
-    .expected = expected `{$expected}`
-    .expected_found = expected signature `{$expected}`
-               {"   "}found signature `{$found}`
-
-infer_tid_rel_help = verify the lifetime relationships in the `trait` and `impl` between the `self` argument, the other inputs and its output
-infer_tid_consider_borrowing = consider borrowing this type parameter in the trait
-infer_tid_param_help = the lifetime requirements from the `impl` do not correspond to the requirements in the `trait`
-
-infer_dtcs_has_lifetime_req_label = this has an implicit `'static` lifetime requirement
-infer_dtcs_introduces_requirement = calling this method introduces the `impl`'s 'static` requirement
-infer_dtcs_has_req_note = the used `impl` has a `'static` requirement
-infer_dtcs_suggestion = consider relaxing the implicit `'static` requirement
-
-infer_but_calling_introduces = {$has_param_name ->
-    [true] `{$param_name}`
-    *[false] `fn` parameter
-} has {$lifetime_kind ->
-    [true] lifetime `{$lifetime}`
-    *[false] an anonymous lifetime `'_`
-} but calling `{$assoc_item}` introduces an implicit `'static` lifetime requirement
-    .label1 = {$has_lifetime ->
-        [true] lifetime `{$lifetime}`
-        *[false] an anonymous lifetime `'_`
-    }
-    .label2 = ...is used and required to live as long as `'static` here because of an implicit lifetime bound on the {$has_impl_path ->
-        [true] `impl` of `{$impl_path}`
-        *[false] inherent `impl`
-    }
-
-infer_but_needs_to_satisfy = {$has_param_name ->
-    [true] `{$param_name}`
-    *[false] `fn` parameter
-} has {$has_lifetime ->
-    [true] lifetime `{$lifetime}`
-    *[false] an anonymous lifetime `'_`
-} but it needs to satisfy a `'static` lifetime requirement
-    .influencer = this data with {$has_lifetime ->
-        [true] lifetime `{$lifetime}`
-        *[false] an anonymous lifetime `'_`
-    }...
-    .require = {$spans_empty ->
-        *[true] ...is used and required to live as long as `'static` here
-        [false] ...and is required to live as long as `'static` here
-    }
-    .used_here = ...is used here...
-    .introduced_by_bound = 'static` lifetime requirement introduced by this bound
-
-infer_more_targeted = {$has_param_name ->
-    [true] `{$param_name}`
-    *[false] `fn` parameter
-} has {$has_lifetime ->
-    [true] lifetime `{$lifetime}`
-    *[false] an anonymous lifetime `'_`
-} but calling `{$ident}` introduces an implicit `'static` lifetime requirement
-
-infer_ril_introduced_here = `'static` requirement introduced here
-infer_ril_introduced_by = requirement introduced by this return type
-infer_ril_because_of = because of this returned expression
-infer_ril_static_introduced_by = "`'static` lifetime requirement introduced by the return type
-
-infer_where_remove = remove the `where` clause
-infer_where_copy_predicates = copy the `where` clause predicates from the trait
-
-infer_srs_remove_and_box = consider removing this semicolon and boxing the expressions
-infer_srs_remove = consider removing this semicolon
-infer_srs_add = consider returning the local binding `{$ident}`
-infer_srs_add_one = consider returning one of these bindings
-
-infer_await_both_futures = consider `await`ing on both `Future`s
-infer_await_future = consider `await`ing on the `Future`
-infer_await_note = calling an async function returns a future
-
-infer_prlf_defined_with_sub = the lifetime `{$sub_symbol}` defined here...
-infer_prlf_defined_without_sub = the lifetime defined here...
-infer_prlf_must_oultive_with_sup = ...must outlive the lifetime `{$sup_symbol}` defined here
-infer_prlf_must_oultive_without_sup = ...must outlive the lifetime defined here
-infer_prlf_known_limitation = this is a known limitation that will be removed in the future (see issue #100013 <https://github.com/rust-lang/rust/issues/100013> for more information)
diff --git a/compiler/rustc_error_messages/locales/en-US/interface.ftl b/compiler/rustc_error_messages/locales/en-US/interface.ftl
deleted file mode 100644
index a7bc0e7af1f..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/interface.ftl
+++ /dev/null
@@ -1,56 +0,0 @@
-interface_ferris_identifier =
-    Ferris cannot be used as an identifier
-    .suggestion = try using their name instead
-
-interface_emoji_identifier =
-    identifiers cannot contain emoji: `{$ident}`
-
-interface_mixed_bin_crate =
-    cannot mix `bin` crate type with others
-
-interface_mixed_proc_macro_crate =
-    cannot mix `proc-macro` crate type with others
-
-interface_proc_macro_doc_without_arg =
-    Trying to document proc macro crate without passing '--crate-type proc-macro to rustdoc
-    .warn = The generated documentation may be incorrect
-
-interface_error_writing_dependencies =
-    error writing dependencies to `{$path}`: {$error}
-
-interface_input_file_would_be_overwritten =
-    the input file "{$path}" would be overwritten by the generated executable
-
-interface_generated_file_conflicts_with_directory =
-    the generated executable for the input file "{$input_path}" conflicts with the existing directory "{$dir_path}"
-
-interface_temps_dir_error =
-    failed to find or create the directory specified by `--temps-dir`
-
-interface_out_dir_error =
-    failed to find or create the directory specified by `--out-dir`
-
-interface_cant_emit_mir =
-    could not emit MIR: {$error}
-
-interface_rustc_error_fatal =
-    fatal error triggered by #[rustc_error]
-
-interface_rustc_error_unexpected_annotation =
-    unexpected annotation used with `#[rustc_error(...)]!
-
-interface_failed_writing_file =
-    failed to write file {$path}: {$error}"
-
-interface_proc_macro_crate_panic_abort =
-    building proc macro crate with `panic=abort` may crash the compiler should the proc-macro panic
-
-interface_unsupported_crate_type_for_target =
-    dropping unsupported crate type `{$crate_type}` for target `{$target_triple}`
-
-interface_multiple_output_types_adaption =
-    due to multiple output types requested, the explicitly specified output file name will be adapted for each output type
-
-interface_ignoring_extra_filename = ignoring -C extra-filename flag due to -o flag
-
-interface_ignoring_out_dir = ignoring --out-dir flag due to -o flag
diff --git a/compiler/rustc_error_messages/locales/en-US/lint.ftl b/compiler/rustc_error_messages/locales/en-US/lint.ftl
deleted file mode 100644
index b1e7cc69a80..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/lint.ftl
+++ /dev/null
@@ -1,503 +0,0 @@
-lint_array_into_iter =
-    this method call resolves to `<&{$target} as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <{$target} as IntoIterator>::into_iter in Rust 2021
-    .use_iter_suggestion = use `.iter()` instead of `.into_iter()` to avoid ambiguity
-    .remove_into_iter_suggestion = or remove `.into_iter()` to iterate by value
-    .use_explicit_into_iter_suggestion =
-        or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
-
-lint_enum_intrinsics_mem_discriminant =
-    the return value of `mem::discriminant` is unspecified when called with a non-enum type
-    .note = the argument to `discriminant` should be a reference to an enum, but it was passed a reference to a `{$ty_param}`, which is not an enum.
-
-lint_enum_intrinsics_mem_variant =
-    the return value of `mem::variant_count` is unspecified when called with a non-enum type
-    .note = the type parameter of `variant_count` should be an enum, but it was instantiated with the type `{$ty_param}`, which is not an enum.
-
-lint_expectation = this lint expectation is unfulfilled
-    .note = the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message
-    .rationale = {$rationale}
-
-lint_for_loops_over_fallibles =
-    for loop over {$article} `{$ty}`. This is more readably written as an `if let` statement
-    .suggestion = consider using `if let` to clear intent
-    .remove_next = to iterate over `{$recv_snip}` remove the call to `next`
-    .use_while_let = to check pattern in a loop use `while let`
-    .use_question_mark = consider unwrapping the `Result` with `?` to iterate over its contents
-
-lint_non_binding_let_on_sync_lock =
-    non-binding let on a synchronization lock
-
-lint_non_binding_let_on_drop_type =
-    non-binding let on a type that implements `Drop`
-
-lint_non_binding_let_suggestion =
-    consider binding to an unused variable to avoid immediately dropping the value
-
-lint_non_binding_let_multi_suggestion =
-    consider immediately dropping the value
-
-lint_deprecated_lint_name =
-    lint name `{$name}` is deprecated and may not have an effect in the future.
-    .suggestion = change it to
-
-lint_renamed_or_removed_lint = {$msg}
-    .suggestion = use the new name
-
-lint_unknown_lint =
-    unknown lint: `{$name}`
-    .suggestion = did you mean
-
-lint_ignored_unless_crate_specified = {$level}({$name}) is ignored unless specified at crate level
-
-lint_unknown_gated_lint =
-    unknown lint: `{$name}`
-    .note = the `{$name}` lint is unstable
-
-lint_hidden_unicode_codepoints = unicode codepoint changing visible direction of text present in {$label}
-    .label = this {$label} contains {$count ->
-        [one] an invisible
-        *[other] invisible
-    } unicode text flow control {$count ->
-        [one] codepoint
-        *[other] codepoints
-    }
-    .note = these kind of unicode codepoints change the way text flows on applications that support them, but can cause confusion because they change the order of characters on the screen
-    .suggestion_remove = if their presence wasn't intentional, you can remove them
-    .suggestion_escape = if you want to keep them but make them visible in your source code, you can escape them
-    .no_suggestion_note_escape = if you want to keep them but make them visible in your source code, you can escape them: {$escaped}
-
-lint_default_hash_types = prefer `{$preferred}` over `{$used}`, it has better performance
-    .note = a `use rustc_data_structures::fx::{$preferred}` may be necessary
-
-lint_query_instability = using `{$query}` can result in unstable query results
-    .note = if you believe this case to be fine, allow this lint and add a comment explaining your rationale
-
-lint_tykind_kind = usage of `ty::TyKind::<kind>`
-    .suggestion = try using `ty::<kind>` directly
-
-lint_tykind = usage of `ty::TyKind`
-    .help = try using `Ty` instead
-
-lint_ty_qualified = usage of qualified `ty::{$ty}`
-    .suggestion = try importing it and using it unqualified
-
-lint_lintpass_by_hand = implementing `LintPass` by hand
-    .help = try using `declare_lint_pass!` or `impl_lint_pass!` instead
-
-lint_non_existant_doc_keyword = found non-existing keyword `{$keyword}` used in `#[doc(keyword = \"...\")]`
-    .help = only existing keywords are allowed in core/std
-
-lint_diag_out_of_impl =
-    diagnostics should only be created in `IntoDiagnostic`/`AddToDiagnostic` impls
-
-lint_untranslatable_diag = diagnostics should be created using translatable messages
-
-lint_bad_opt_access = {$msg}
-
-lint_cstring_ptr = getting the inner pointer of a temporary `CString`
-    .as_ptr_label = this pointer will be invalid
-    .unwrap_label = this `CString` is deallocated at the end of the statement, bind it to a variable to extend its lifetime
-    .note = pointers do not have a lifetime; when calling `as_ptr` the `CString` will be deallocated at the end of the statement because nothing is referencing it as far as the type system is concerned
-    .help = for more information, see https://doc.rust-lang.org/reference/destructors.html
-
-lint_multple_supertrait_upcastable = `{$ident}` is object-safe and has multiple supertraits
-
-lint_identifier_non_ascii_char = identifier contains non-ASCII characters
-
-lint_identifier_uncommon_codepoints = identifier contains uncommon Unicode codepoints
-
-lint_confusable_identifier_pair = identifier pair considered confusable between `{$existing_sym}` and `{$sym}`
-    .label = this is where the previous identifier occurred
-
-lint_mixed_script_confusables =
-    the usage of Script Group `{$set}` in this crate consists solely of mixed script confusables
-    .includes_note = the usage includes {$includes}
-    .note = please recheck to make sure their usages are indeed what you want
-
-lint_non_fmt_panic = panic message is not a string literal
-    .note = this usage of `{$name}!()` is deprecated; it will be a hard error in Rust 2021
-    .more_info_note = for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
-    .supports_fmt_note = the `{$name}!()` macro supports formatting, so there's no need for the `format!()` macro here
-    .supports_fmt_suggestion = remove the `format!(..)` macro call
-    .display_suggestion = add a "{"{"}{"}"}" format string to `Display` the message
-    .debug_suggestion =
-        add a "{"{"}:?{"}"}" format string to use the `Debug` implementation of `{$ty}`
-    .panic_suggestion = {$already_suggested ->
-        [true] or use
-        *[false] use
-    } std::panic::panic_any instead
-
-lint_non_fmt_panic_unused =
-    panic message contains {$count ->
-        [one] an unused
-        *[other] unused
-    } formatting {$count ->
-        [one] placeholder
-        *[other] placeholders
-    }
-    .note = this message is not used as a format string when given without arguments, but will be in Rust 2021
-    .add_args_suggestion = add the missing {$count ->
-        [one] argument
-        *[other] arguments
-    }
-    .add_fmt_suggestion = or add a "{"{"}{"}"}" format string to use the message literally
-
-lint_non_fmt_panic_braces =
-    panic message contains {$count ->
-        [one] a brace
-        *[other] braces
-    }
-    .note = this message is not used as a format string, but will be in Rust 2021
-    .suggestion = add a "{"{"}{"}"}" format string to use the message literally
-
-lint_non_camel_case_type = {$sort} `{$name}` should have an upper camel case name
-    .suggestion = convert the identifier to upper camel case
-    .label = should have an UpperCamelCase name
-
-lint_non_snake_case = {$sort} `{$name}` should have a snake case name
-    .rename_or_convert_suggestion = rename the identifier or convert it to a snake case raw identifier
-    .cannot_convert_note = `{$sc}` cannot be used as a raw identifier
-    .rename_suggestion = rename the identifier
-    .convert_suggestion = convert the identifier to snake case
-    .help = convert the identifier to snake case: `{$sc}`
-    .label = should have a snake_case name
-
-lint_non_upper_case_global = {$sort} `{$name}` should have an upper case name
-    .suggestion = convert the identifier to upper case
-    .label = should have an UPPER_CASE name
-
-lint_noop_method_call = call to `.{$method}()` on a reference in this situation does nothing
-    .label = unnecessary method call
-    .note = the type `{$receiver_ty}` which `{$method}` is being called on is the same as the type returned from `{$method}`, so the method call does not do anything and can be removed
-
-lint_pass_by_value = passing `{$ty}` by reference
-    .suggestion = try passing by value
-
-lint_redundant_semicolons =
-    unnecessary trailing {$multiple ->
-        [true] semicolons
-        *[false] semicolon
-    }
-    .suggestion = remove {$multiple ->
-        [true] these semicolons
-        *[false] this semicolon
-    }
-
-lint_drop_trait_constraints =
-    bounds on `{$predicate}` are most likely incorrect, consider instead using `{$needs_drop}` to detect whether a type can be trivially dropped
-
-lint_drop_glue =
-    types that do not implement `Drop` can still have drop glue, consider instead using `{$needs_drop}` to detect whether a type is trivially dropped
-
-lint_range_endpoint_out_of_range = range endpoint is out of range for `{$ty}`
-    .suggestion = use an inclusive range instead
-
-lint_overflowing_bin_hex = literal out of range for `{$ty}`
-    .negative_note = the literal `{$lit}` (decimal `{$dec}`) does not fit into the type `{$ty}`
-    .negative_becomes_note = and the value `-{$lit}` will become `{$actually}{$ty}`
-    .positive_note = the literal `{$lit}` (decimal `{$dec}`) does not fit into the type `{$ty}` and will become `{$actually}{$ty}`
-    .suggestion = consider using the type `{$suggestion_ty}` instead
-    .help = consider using the type `{$suggestion_ty}` instead
-
-lint_overflowing_int = literal out of range for `{$ty}`
-    .note = the literal `{$lit}` does not fit into the type `{$ty}` whose range is `{$min}..={$max}`
-    .help = consider using the type `{$suggestion_ty}` instead
-
-lint_only_cast_u8_to_char = only `u8` can be cast into `char`
-    .suggestion = use a `char` literal instead
-
-lint_overflowing_uint = literal out of range for `{$ty}`
-    .note = the literal `{$lit}` does not fit into the type `{$ty}` whose range is `{$min}..={$max}`
-
-lint_overflowing_literal = literal out of range for `{$ty}`
-    .note = the literal `{$lit}` does not fit into the type `{$ty}` and will be converted to `{$ty}::INFINITY`
-
-lint_unused_comparisons = comparison is useless due to type limits
-
-lint_improper_ctypes = `extern` {$desc} uses type `{$ty}`, which is not FFI-safe
-    .label = not FFI-safe
-    .note = the type is defined here
-
-lint_improper_ctypes_opaque = opaque types have no C equivalent
-
-lint_improper_ctypes_fnptr_reason = this function pointer has Rust-specific calling convention
-lint_improper_ctypes_fnptr_help = consider using an `extern fn(...) -> ...` function pointer instead
-
-lint_improper_ctypes_tuple_reason = tuples have unspecified layout
-lint_improper_ctypes_tuple_help = consider using a struct instead
-
-lint_improper_ctypes_str_reason = string slices have no C equivalent
-lint_improper_ctypes_str_help = consider using `*const u8` and a length instead
-
-lint_improper_ctypes_dyn = trait objects have no C equivalent
-
-lint_improper_ctypes_slice_reason = slices have no C equivalent
-lint_improper_ctypes_slice_help = consider using a raw pointer instead
-
-lint_improper_ctypes_128bit = 128-bit integers don't currently have a known stable ABI
-
-lint_improper_ctypes_char_reason = the `char` type has no C equivalent
-lint_improper_ctypes_char_help = consider using `u32` or `libc::wchar_t` instead
-
-lint_improper_ctypes_non_exhaustive = this enum is non-exhaustive
-lint_improper_ctypes_non_exhaustive_variant = this enum has non-exhaustive variants
-
-lint_improper_ctypes_enum_repr_reason = enum has no representation hint
-lint_improper_ctypes_enum_repr_help =
-    consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
-
-lint_improper_ctypes_struct_fieldless_reason = this struct has no fields
-lint_improper_ctypes_struct_fieldless_help = consider adding a member to this struct
-
-lint_improper_ctypes_union_fieldless_reason = this union has no fields
-lint_improper_ctypes_union_fieldless_help = consider adding a member to this union
-
-lint_improper_ctypes_struct_non_exhaustive = this struct is non-exhaustive
-lint_improper_ctypes_union_non_exhaustive = this union is non-exhaustive
-
-lint_improper_ctypes_struct_layout_reason = this struct has unspecified layout
-lint_improper_ctypes_struct_layout_help = consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
-
-lint_improper_ctypes_union_layout_reason = this union has unspecified layout
-lint_improper_ctypes_union_layout_help = consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this union
-
-lint_improper_ctypes_box = box cannot be represented as a single pointer
-
-lint_improper_ctypes_enum_phantomdata = this enum contains a PhantomData field
-
-lint_improper_ctypes_struct_zst = this struct contains only zero-sized fields
-
-lint_improper_ctypes_array_reason = passing raw arrays by value is not FFI-safe
-lint_improper_ctypes_array_help = consider passing a pointer to the array
-
-lint_improper_ctypes_only_phantomdata = composed only of `PhantomData`
-
-lint_variant_size_differences =
-    enum variant is more than three times larger ({$largest} bytes) than the next largest
-
-lint_atomic_ordering_load = atomic loads cannot have `Release` or `AcqRel` ordering
-    .help = consider using ordering modes `Acquire`, `SeqCst` or `Relaxed`
-
-lint_atomic_ordering_store = atomic stores cannot have `Acquire` or `AcqRel` ordering
-    .help = consider using ordering modes `Release`, `SeqCst` or `Relaxed`
-
-lint_atomic_ordering_fence = memory fences cannot have `Relaxed` ordering
-    .help = consider using ordering modes `Acquire`, `Release`, `AcqRel` or `SeqCst`
-
-lint_atomic_ordering_invalid = `{$method}`'s failure ordering may not be `Release` or `AcqRel`, since a failed `{$method}` does not result in a write
-    .label = invalid failure ordering
-    .help = consider using `Acquire` or `Relaxed` failure ordering instead
-
-lint_unused_op = unused {$op} that must be used
-    .label = the {$op} produces a value
-    .suggestion = use `let _ = ...` to ignore the resulting value
-
-lint_unused_result = unused result of type `{$ty}`
-
-lint_unused_closure =
-    unused {$pre}{$count ->
-        [one] closure
-        *[other] closures
-    }{$post} that must be used
-    .note = closures are lazy and do nothing unless called
-
-lint_unused_generator =
-    unused {$pre}{$count ->
-        [one] generator
-        *[other] generator
-    }{$post} that must be used
-    .note = generators are lazy and do nothing unless resumed
-
-lint_unused_def = unused {$pre}`{$def}`{$post} that must be used
-    .suggestion = use `let _ = ...` to ignore the resulting value
-
-lint_path_statement_drop = path statement drops value
-    .suggestion = use `drop` to clarify the intent
-
-lint_path_statement_no_effect = path statement with no effect
-
-lint_unused_delim = unnecessary {$delim} around {$item}
-    .suggestion = remove these {$delim}
-
-lint_unused_import_braces = braces around {$node} is unnecessary
-
-lint_unused_allocation = unnecessary allocation, use `&` instead
-lint_unused_allocation_mut = unnecessary allocation, use `&mut` instead
-
-lint_builtin_while_true = denote infinite loops with `loop {"{"} ... {"}"}`
-    .suggestion = use `loop`
-
-lint_builtin_box_pointers = type uses owned (Box type) pointers: {$ty}
-
-lint_builtin_non_shorthand_field_patterns = the `{$ident}:` in this pattern is redundant
-    .suggestion = use shorthand field pattern
-
-lint_builtin_overridden_symbol_name =
-    the linker's behavior with multiple libraries exporting duplicate symbol names is undefined and Rust cannot provide guarantees when you manually override them
-
-lint_builtin_overridden_symbol_section =
-    the program's behavior with overridden link sections on items is unpredictable and Rust cannot provide guarantees when you manually override them
-
-lint_builtin_allow_internal_unsafe =
-    `allow_internal_unsafe` allows defining macros using unsafe without triggering the `unsafe_code` lint at their call site
-
-lint_builtin_unsafe_block = usage of an `unsafe` block
-
-lint_builtin_unsafe_trait = declaration of an `unsafe` trait
-
-lint_builtin_unsafe_impl = implementation of an `unsafe` trait
-
-lint_builtin_no_mangle_fn = declaration of a `no_mangle` function
-lint_builtin_export_name_fn = declaration of a function with `export_name`
-lint_builtin_link_section_fn = declaration of a function with `link_section`
-
-lint_builtin_no_mangle_static = declaration of a `no_mangle` static
-lint_builtin_export_name_static = declaration of a static with `export_name`
-lint_builtin_link_section_static = declaration of a static with `link_section`
-
-lint_builtin_no_mangle_method = declaration of a `no_mangle` method
-lint_builtin_export_name_method = declaration of a method with `export_name`
-
-lint_builtin_decl_unsafe_fn = declaration of an `unsafe` function
-lint_builtin_decl_unsafe_method = declaration of an `unsafe` method
-lint_builtin_impl_unsafe_method = implementation of an `unsafe` method
-
-lint_builtin_missing_doc = missing documentation for {$article} {$desc}
-
-lint_builtin_missing_copy_impl = type could implement `Copy`; consider adding `impl Copy`
-
-lint_builtin_missing_debug_impl =
-    type does not implement `{$debug}`; consider adding `#[derive(Debug)]` or a manual implementation
-
-lint_builtin_anonymous_params = anonymous parameters are deprecated and will be removed in the next edition
-    .suggestion = try naming the parameter or explicitly ignoring it
-
-lint_builtin_deprecated_attr_link = use of deprecated attribute `{$name}`: {$reason}. See {$link}
-    .msg_suggestion = {$msg}
-    .default_suggestion = remove this attribute
-lint_builtin_deprecated_attr_used = use of deprecated attribute `{$name}`: no longer used.
-lint_builtin_deprecated_attr_default_suggestion = remove this attribute
-
-lint_builtin_unused_doc_comment = unused doc comment
-    .label = rustdoc does not generate documentation for {$kind}
-    .plain_help = use `//` for a plain comment
-    .block_help = use `/* */` for a plain comment
-
-lint_builtin_no_mangle_generic = functions generic over types or consts must be mangled
-    .suggestion = remove this attribute
-
-lint_builtin_const_no_mangle = const items should never be `#[no_mangle]`
-    .suggestion = try a static value
-
-lint_builtin_mutable_transmutes =
-    transmuting &T to &mut T is undefined behavior, even if the reference is unused, consider instead using an UnsafeCell
-
-lint_builtin_unstable_features = unstable feature
-
-lint_ungated_async_fn_track_caller = `#[track_caller]` on async functions is a no-op
-     .label = this function will not propagate the caller location
-
-lint_builtin_unreachable_pub = unreachable `pub` {$what}
-    .suggestion = consider restricting its visibility
-    .help = or consider exporting it for use by other crates
-
-lint_builtin_unexpected_cli_config_name = unexpected `{$name}` as condition name
-    .help = was set with `--cfg` but isn't in the `--check-cfg` expected names
-
-lint_builtin_unexpected_cli_config_value = unexpected condition value `{$value}` for condition name `{$name}`
-    .help = was set with `--cfg` but isn't in the `--check-cfg` expected values
-
-lint_builtin_type_alias_bounds_help = use fully disambiguated paths (i.e., `<T as Trait>::Assoc`) to refer to associated types in type aliases
-
-lint_builtin_type_alias_where_clause = where clauses are not enforced in type aliases
-    .suggestion = the clause will not be checked when the type alias is used, and should be removed
-
-lint_builtin_type_alias_generic_bounds = bounds on generic parameters are not enforced in type aliases
-    .suggestion = the bound will not be checked when the type alias is used, and should be removed
-
-lint_builtin_trivial_bounds = {$predicate_kind_name} bound {$predicate} does not depend on any type or lifetime parameters
-
-lint_builtin_ellipsis_inclusive_range_patterns = `...` range patterns are deprecated
-    .suggestion = use `..=` for an inclusive range
-
-lint_builtin_unnameable_test_items = cannot test inner items
-
-lint_builtin_keyword_idents = `{$kw}` is a keyword in the {$next} edition
-    .suggestion = you can use a raw identifier to stay compatible
-
-lint_builtin_explicit_outlives = outlives requirements can be inferred
-    .suggestion = remove {$count ->
-        [one] this bound
-        *[other] these bounds
-    }
-
-lint_builtin_incomplete_features = the feature `{$name}` is incomplete and may not be safe to use and/or cause compiler crashes
-    .note = see issue #{$n} <https://github.com/rust-lang/rust/issues/{$n}> for more information
-    .help = consider using `min_{$name}` instead, which is more stable and complete
-
-lint_builtin_unpermitted_type_init_zeroed = the type `{$ty}` does not permit zero-initialization
-lint_builtin_unpermitted_type_init_unint = the type `{$ty}` does not permit being left uninitialized
-
-lint_builtin_unpermitted_type_init_label = this code causes undefined behavior when executed
-lint_builtin_unpermitted_type_init_label_suggestion = help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
-
-lint_builtin_clashing_extern_same_name = `{$this}` redeclared with a different signature
-    .previous_decl_label = `{$orig}` previously declared here
-    .mismatch_label = this signature doesn't match the previous declaration
-lint_builtin_clashing_extern_diff_name = `{$this}` redeclares `{$orig}` with a different signature
-    .previous_decl_label = `{$orig}` previously declared here
-    .mismatch_label = this signature doesn't match the previous declaration
-
-lint_builtin_deref_nullptr = dereferencing a null pointer
-    .label = this code causes undefined behavior when executed
-
-lint_builtin_asm_labels = avoid using named labels in inline assembly
-
-lint_builtin_special_module_name_used_lib = found module declaration for lib.rs
-    .note = lib.rs is the root of this crate's library target
-    .help = to refer to it from other targets, use the library's name as the path
-
-lint_builtin_special_module_name_used_main = found module declaration for main.rs
-    .note = a binary crate cannot be used as library
-
-lint_supertrait_as_deref_target = `{$t}` implements `Deref` with supertrait `{$target_principal}` as target
-    .label = target type is set here
-
-lint_overruled_attribute = {$lint_level}({$lint_source}) incompatible with previous forbid
-    .label = overruled by previous forbid
-
-lint_default_source = `forbid` lint level is the default for {$id}
-
-lint_node_source = `forbid` level set here
-    .note = {$reason}
-
-lint_command_line_source = `forbid` lint level was set on command line
-
-lint_malformed_attribute = malformed lint attribute input
-
-lint_bad_attribute_argument = bad attribute argument
-
-lint_reason_must_be_string_literal = reason must be a string literal
-
-lint_reason_must_come_last = reason in lint attribute must come last
-
-lint_unknown_tool_in_scoped_lint = unknown tool name `{$tool_name}` found in scoped lint: `{$tool_name}::{$lint_name}`
-    .help = add `#![register_tool({$tool_name})]` to the crate root
-
-lint_unsupported_group = `{$lint_group}` lint group is not supported with ´--force-warn´
-
-lint_requested_level = requested on the command line with `{$level} {$lint_name}`
-
-lint_check_name_unknown = unknown lint: `{$lint_name}`
-    .help = did you mean: `{$suggestion}`
-
-lint_check_name_unknown_tool = unknown lint tool: `{$tool_name}`
-
-lint_check_name_warning = {$msg}
-
-lint_check_name_deprecated = lint name `{$lint_name}` is deprecated and does not have an effect anymore. Use: {$new_name}
-
-lint_opaque_hidden_inferred_bound = opaque type `{$ty}` does not satisfy its associated type bounds
-    .specifically = this associated type bound is unsatisfied for `{$proj_ty}`
-
-lint_opaque_hidden_inferred_bound_sugg = add this bound
diff --git a/compiler/rustc_error_messages/locales/en-US/metadata.ftl b/compiler/rustc_error_messages/locales/en-US/metadata.ftl
deleted file mode 100644
index 79b8b417257..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/metadata.ftl
+++ /dev/null
@@ -1,288 +0,0 @@
-metadata_rlib_required =
-    crate `{$crate_name}` required to be available in rlib format, but was not found in this form
-
-metadata_lib_required =
-    crate `{$crate_name}` required to be available in {$kind} format, but was not found in this form
-
-metadata_rustc_lib_required =
-    crate `{$crate_name}` required to be available in {$kind} format, but was not found in this form
-    .note = only .rmeta files are distributed for `rustc_private` crates other than `rustc_driver`
-    .help = try adding `extern crate rustc_driver;` at the top level of this crate
-
-metadata_crate_dep_multiple =
-    cannot satisfy dependencies so `{$crate_name}` only shows up once
-    .help = having upstream crates all available in one format will likely make this go away
-
-metadata_two_panic_runtimes =
-    cannot link together two panic runtimes: {$prev_name} and {$cur_name}
-
-metadata_bad_panic_strategy =
-    the linked panic runtime `{$runtime}` is not compiled with this crate's panic strategy `{$strategy}`
-
-metadata_required_panic_strategy =
-    the crate `{$crate_name}` requires panic strategy `{$found_strategy}` which is incompatible with this crate's strategy of `{$desired_strategy}`
-
-metadata_incompatible_panic_in_drop_strategy =
-    the crate `{$crate_name}` is compiled with the panic-in-drop strategy `{$found_strategy}` which is incompatible with this crate's strategy of `{$desired_strategy}`
-
-metadata_multiple_names_in_link =
-    multiple `name` arguments in a single `#[link]` attribute
-
-metadata_multiple_kinds_in_link =
-    multiple `kind` arguments in a single `#[link]` attribute
-
-metadata_link_name_form =
-    link name must be of the form `name = "string"`
-
-metadata_link_kind_form =
-    link kind must be of the form `kind = "string"`
-
-metadata_link_modifiers_form =
-    link modifiers must be of the form `modifiers = "string"`
-
-metadata_link_cfg_form =
-    link cfg must be of the form `cfg(/* predicate */)`
-
-metadata_wasm_import_form =
-    wasm import module must be of the form `wasm_import_module = "string"`
-
-metadata_empty_link_name =
-    link name must not be empty
-    .label = empty link name
-
-metadata_link_framework_apple =
-    link kind `framework` is only supported on Apple targets
-
-metadata_framework_only_windows =
-    link kind `raw-dylib` is only supported on Windows targets
-
-metadata_unknown_link_kind =
-    unknown link kind `{$kind}`, expected one of: static, dylib, framework, raw-dylib
-    .label = unknown link kind
-
-metadata_multiple_link_modifiers =
-    multiple `modifiers` arguments in a single `#[link]` attribute
-
-metadata_multiple_cfgs =
-    multiple `cfg` arguments in a single `#[link]` attribute
-
-metadata_link_cfg_single_predicate =
-    link cfg must have a single predicate argument
-
-metadata_multiple_wasm_import =
-    multiple `wasm_import_module` arguments in a single `#[link]` attribute
-
-metadata_unexpected_link_arg =
-    unexpected `#[link]` argument, expected one of: name, kind, modifiers, cfg, wasm_import_module, import_name_type
-
-metadata_invalid_link_modifier =
-    invalid linking modifier syntax, expected '+' or '-' prefix before one of: bundle, verbatim, whole-archive, as-needed
-
-metadata_multiple_modifiers =
-    multiple `{$modifier}` modifiers in a single `modifiers` argument
-
-metadata_bundle_needs_static =
-    linking modifier `bundle` is only compatible with `static` linking kind
-
-metadata_whole_archive_needs_static =
-    linking modifier `whole-archive` is only compatible with `static` linking kind
-
-metadata_as_needed_compatibility =
-    linking modifier `as-needed` is only compatible with `dylib` and `framework` linking kinds
-
-metadata_unknown_link_modifier =
-    unknown linking modifier `{$modifier}`, expected one of: bundle, verbatim, whole-archive, as-needed
-
-metadata_incompatible_wasm_link =
-    `wasm_import_module` is incompatible with other arguments in `#[link]` attributes
-
-metadata_link_requires_name =
-    `#[link]` attribute requires a `name = "string"` argument
-    .label = missing `name` argument
-
-metadata_raw_dylib_no_nul =
-    link name must not contain NUL characters if link kind is `raw-dylib`
-
-metadata_link_ordinal_raw_dylib =
-    `#[link_ordinal]` is only supported if link kind is `raw-dylib`
-
-metadata_lib_framework_apple =
-    library kind `framework` is only supported on Apple targets
-
-metadata_empty_renaming_target =
-    an empty renaming target was specified for library `{$lib_name}`
-
-metadata_renaming_no_link =
-    renaming of the library `{$lib_name}` was specified, however this crate contains no `#[link(...)]` attributes referencing this library
-
-metadata_multiple_renamings =
-    multiple renamings were specified for library `{$lib_name}`
-
-metadata_no_link_mod_override =
-    overriding linking modifiers from command line is not supported
-
-metadata_unsupported_abi_i686 =
-    ABI not supported by `#[link(kind = "raw-dylib")]` on i686
-
-metadata_unsupported_abi =
-    ABI not supported by `#[link(kind = "raw-dylib")]` on this architecture
-
-metadata_fail_create_file_encoder =
-    failed to create file encoder: {$err}
-
-metadata_fail_seek_file =
-    failed to seek the file: {$err}
-
-metadata_fail_write_file =
-    failed to write to the file: {$err}
-
-metadata_crate_not_panic_runtime =
-    the crate `{$crate_name}` is not a panic runtime
-
-metadata_no_panic_strategy =
-    the crate `{$crate_name}` does not have the panic strategy `{$strategy}`
-
-metadata_profiler_builtins_needs_core =
-    `profiler_builtins` crate (required by compiler options) is not compatible with crate attribute `#![no_core]`
-
-metadata_not_profiler_runtime =
-    the crate `{$crate_name}` is not a profiler runtime
-
-metadata_no_multiple_global_alloc =
-    cannot define multiple global allocators
-    .label = cannot define a new global allocator
-
-metadata_prev_global_alloc =
-    previous global allocator defined here
-
-metadata_no_multiple_alloc_error_handler =
-    cannot define multiple allocation error handlers
-    .label = cannot define a new allocation error handler
-
-metadata_prev_alloc_error_handler =
-    previous allocation error handler defined here
-
-metadata_conflicting_global_alloc =
-    the `#[global_allocator]` in {$other_crate_name} conflicts with global allocator in: {$crate_name}
-
-metadata_conflicting_alloc_error_handler =
-    the `#[alloc_error_handler]` in {$other_crate_name} conflicts with allocation error handler in: {$crate_name}
-
-metadata_global_alloc_required =
-    no global memory allocator found but one is required; link to std or add `#[global_allocator]` to a static item that implements the GlobalAlloc trait
-
-metadata_no_transitive_needs_dep =
-    the crate `{$crate_name}` cannot depend on a crate that needs {$needs_crate_name}, but it depends on `{$deps_crate_name}`
-
-metadata_failed_write_error =
-    failed to write {$filename}: {$err}
-
-metadata_missing_native_library =
-    could not find native static library `{$libname}`, perhaps an -L flag is missing?
-
-metadata_only_provide_library_name = only provide the library name `{$suggested_name}`, not the full filename
-
-metadata_failed_create_tempdir =
-    couldn't create a temp dir: {$err}
-
-metadata_failed_create_file =
-    failed to create the file {$filename}: {$err}
-
-metadata_failed_create_encoded_metadata =
-    failed to create encoded metadata from file: {$err}
-
-metadata_non_ascii_name =
-    cannot load a crate with a non-ascii name `{$crate_name}`
-
-metadata_extern_location_not_exist =
-    extern location for {$crate_name} does not exist: {$location}
-
-metadata_extern_location_not_file =
-    extern location for {$crate_name} is not a file: {$location}
-
-metadata_multiple_candidates =
-    multiple candidates for `{$flavor}` dependency `{$crate_name}` found
-
-metadata_symbol_conflicts_current =
-    the current crate is indistinguishable from one of its dependencies: it has the same crate-name `{$crate_name}` and was compiled with the same `-C metadata` arguments. This will result in symbol conflicts between the two.
-
-metadata_symbol_conflicts_others =
-    found two different crates with name `{$crate_name}` that are not distinguished by differing `-C metadata`. This will result in symbol conflicts between the two.
-
-metadata_stable_crate_id_collision =
-    found crates (`{$crate_name0}` and `{$crate_name1}`) with colliding StableCrateId values.
-
-metadata_dl_error =
-    {$err}
-
-metadata_newer_crate_version =
-    found possibly newer version of crate `{$crate_name}`{$add_info}
-    .note = perhaps that crate needs to be recompiled?
-
-metadata_found_crate_versions =
-    the following crate versions were found:{$found_crates}
-
-metadata_no_crate_with_triple =
-    couldn't find crate `{$crate_name}` with expected target triple {$locator_triple}{$add_info}
-
-metadata_found_staticlib =
-    found staticlib `{$crate_name}` instead of rlib or dylib{$add_info}
-    .help = please recompile that crate using --crate-type lib
-
-metadata_incompatible_rustc =
-    found crate `{$crate_name}` compiled by an incompatible version of rustc{$add_info}
-    .help = please recompile that crate using this compiler ({$rustc_version}) (consider running `cargo clean` first)
-
-metadata_invalid_meta_files =
-    found invalid metadata files for crate `{$crate_name}`{$add_info}
-
-metadata_cannot_find_crate =
-    can't find crate for `{$crate_name}`{$add_info}
-
-metadata_no_dylib_plugin =
-    plugin `{$crate_name}` only found in rlib format, but must be available in dylib format
-
-metadata_target_not_installed =
-    the `{$locator_triple}` target may not be installed
-
-metadata_target_no_std_support =
-    the `{$locator_triple}` target may not support the standard library
-
-metadata_consider_downloading_target =
-    consider downloading the target with `rustup target add {$locator_triple}`
-
-metadata_std_required =
-    `std` is required by `{$current_crate}` because it does not declare `#![no_std]`
-
-metadata_consider_building_std =
-    consider building the standard library from source with `cargo build -Zbuild-std`
-
-metadata_compiler_missing_profiler =
-    the compiler may have been built without the profiler runtime
-
-metadata_install_missing_components =
-    maybe you need to install the missing components with: `rustup component add rust-src rustc-dev llvm-tools-preview`
-
-metadata_cant_find_crate =
-    can't find crate
-
-metadata_crate_location_unknown_type =
-    extern location for {$crate_name} is of an unknown type: {$path}
-
-metadata_lib_filename_form =
-    file name should be lib*.rlib or {$dll_prefix}*{$dll_suffix}
-
-metadata_multiple_import_name_type =
-    multiple `import_name_type` arguments in a single `#[link]` attribute
-
-metadata_import_name_type_form =
-    import name type must be of the form `import_name_type = "string"`
-
-metadata_import_name_type_x86 =
-    import name type is only supported on x86
-
-metadata_unknown_import_name_type =
-    unknown import name type `{$import_name_type}`, expected one of: decorated, noprefix, undecorated
-
-metadata_import_name_type_raw =
-    import name type can only be used with link kind `raw-dylib`
diff --git a/compiler/rustc_error_messages/locales/en-US/middle.ftl b/compiler/rustc_error_messages/locales/en-US/middle.ftl
deleted file mode 100644
index 4f4e5c6a2c9..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/middle.ftl
+++ /dev/null
@@ -1,36 +0,0 @@
-middle_drop_check_overflow =
-    overflow while adding drop-check rules for {$ty}
-    .note = overflowed on {$overflow_ty}
-
-middle_opaque_hidden_type_mismatch =
-    concrete type differs from previous defining opaque type use
-    .label = expected `{$self_ty}`, got `{$other_ty}`
-
-middle_conflict_types =
-    this expression supplies two conflicting concrete types for the same opaque type
-
-middle_previous_use_here =
-    previous use here
-
-middle_limit_invalid =
-    `limit` must be a non-negative integer
-    .label = {$error_str}
-
-middle_const_eval_non_int =
-    constant evaluation of enum discriminant resulted in non-integer
-
-middle_unknown_layout =
-    the type `{$ty}` has an unknown layout
-
-middle_values_too_big =
-    values of the type `{$ty}` are too big for the current architecture
-
-middle_cannot_be_normalized =
-    unable to determine layout for `{$ty}` because `{$failure_ty}` cannot be normalized
-
-middle_strict_coherence_needs_negative_coherence =
-    to use `strict_coherence` on this trait, the `with_negative_coherence` feature must be enabled
-    .label = due to this attribute
-
-middle_const_not_used_in_type_alias =
-    const parameter `{$ct}` is part of concrete type but not used in parameter list for the `impl Trait` type alias
diff --git a/compiler/rustc_error_messages/locales/en-US/mir_build.ftl b/compiler/rustc_error_messages/locales/en-US/mir_build.ftl
deleted file mode 100644
index f9bda721df3..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/mir_build.ftl
+++ /dev/null
@@ -1,376 +0,0 @@
-mir_build_unconditional_recursion = function cannot return without recursing
-    .label = cannot return without recursing
-    .help = a `loop` may express intention better if this is on purpose
-
-mir_build_unconditional_recursion_call_site_label = recursive call site
-
-mir_build_unsafe_op_in_unsafe_fn_call_to_unsafe_fn_requires_unsafe =
-    call to unsafe function `{$function}` is unsafe and requires unsafe block (error E0133)
-    .note = consult the function's documentation for information on how to avoid undefined behavior
-    .label = call to unsafe function
-
-mir_build_unsafe_op_in_unsafe_fn_call_to_unsafe_fn_requires_unsafe_nameless =
-    call to unsafe function is unsafe and requires unsafe block (error E0133)
-    .note = consult the function's documentation for information on how to avoid undefined behavior
-    .label = call to unsafe function
-
-mir_build_unsafe_op_in_unsafe_fn_inline_assembly_requires_unsafe =
-    use of inline assembly is unsafe and requires unsafe block (error E0133)
-    .note = inline assembly is entirely unchecked and can cause undefined behavior
-    .label = use of inline assembly
-
-mir_build_unsafe_op_in_unsafe_fn_initializing_type_with_requires_unsafe =
-    initializing type with `rustc_layout_scalar_valid_range` attr is unsafe and requires unsafe
-    block (error E0133)
-    .note = initializing a layout restricted type's field with a value outside the valid range is undefined behavior
-    .label = initializing type with `rustc_layout_scalar_valid_range` attr
-
-mir_build_unsafe_op_in_unsafe_fn_mutable_static_requires_unsafe =
-    use of mutable static is unsafe and requires unsafe block (error E0133)
-    .note = mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
-    .label = use of mutable static
-
-mir_build_unsafe_op_in_unsafe_fn_extern_static_requires_unsafe =
-    use of extern static is unsafe and requires unsafe block (error E0133)
-    .note = extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
-    .label = use of extern static
-
-mir_build_unsafe_op_in_unsafe_fn_deref_raw_pointer_requires_unsafe =
-    dereference of raw pointer is unsafe and requires unsafe block (error E0133)
-    .note = raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
-    .label = dereference of raw pointer
-
-mir_build_unsafe_op_in_unsafe_fn_union_field_requires_unsafe =
-    access to union field is unsafe and requires unsafe block (error E0133)
-    .note = the field may not be properly initialized: using uninitialized data will cause undefined behavior
-    .label = access to union field
-
-mir_build_unsafe_op_in_unsafe_fn_mutation_of_layout_constrained_field_requires_unsafe =
-    mutation of layout constrained field is unsafe and requires unsafe block (error E0133)
-    .note = mutating layout constrained fields cannot statically be checked for valid values
-    .label = mutation of layout constrained field
-
-mir_build_unsafe_op_in_unsafe_fn_borrow_of_layout_constrained_field_requires_unsafe =
-    borrow of layout constrained field with interior mutability is unsafe and requires unsafe block (error E0133)
-    .note = references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values
-    .label = borrow of layout constrained field with interior mutability
-
-mir_build_unsafe_op_in_unsafe_fn_call_to_fn_with_requires_unsafe =
-    call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe block (error E0133)
-    .note = can only be called if the required target features are available
-    .label = call to function with `#[target_feature]`
-
-mir_build_call_to_unsafe_fn_requires_unsafe =
-    call to unsafe function `{$function}` is unsafe and requires unsafe block
-    .note = consult the function's documentation for information on how to avoid undefined behavior
-    .label = call to unsafe function
-
-mir_build_call_to_unsafe_fn_requires_unsafe_nameless =
-    call to unsafe function is unsafe and requires unsafe block
-    .note = consult the function's documentation for information on how to avoid undefined behavior
-    .label = call to unsafe function
-
-mir_build_call_to_unsafe_fn_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
-    call to unsafe function `{$function}` is unsafe and requires unsafe function or block
-    .note = consult the function's documentation for information on how to avoid undefined behavior
-    .label = call to unsafe function
-
-mir_build_call_to_unsafe_fn_requires_unsafe_nameless_unsafe_op_in_unsafe_fn_allowed =
-    call to unsafe function is unsafe and requires unsafe function or block
-    .note = consult the function's documentation for information on how to avoid undefined behavior
-    .label = call to unsafe function
-
-mir_build_inline_assembly_requires_unsafe =
-    use of inline assembly is unsafe and requires unsafe block
-    .note = inline assembly is entirely unchecked and can cause undefined behavior
-    .label = use of inline assembly
-
-mir_build_inline_assembly_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
-    use of inline assembly is unsafe and requires unsafe function or block
-    .note = inline assembly is entirely unchecked and can cause undefined behavior
-    .label = use of inline assembly
-
-mir_build_initializing_type_with_requires_unsafe =
-    initializing type with `rustc_layout_scalar_valid_range` attr is unsafe and requires unsafe block
-    .note = initializing a layout restricted type's field with a value outside the valid range is undefined behavior
-    .label = initializing type with `rustc_layout_scalar_valid_range` attr
-
-mir_build_initializing_type_with_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
-    initializing type with `rustc_layout_scalar_valid_range` attr is unsafe and requires unsafe function or block
-    .note = initializing a layout restricted type's field with a value outside the valid range is undefined behavior
-    .label = initializing type with `rustc_layout_scalar_valid_range` attr
-
-mir_build_mutable_static_requires_unsafe =
-    use of mutable static is unsafe and requires unsafe block
-    .note = mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
-    .label = use of mutable static
-
-mir_build_mutable_static_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
-    use of mutable static is unsafe and requires unsafe function or block
-    .note = mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
-    .label = use of mutable static
-
-mir_build_extern_static_requires_unsafe =
-    use of extern static is unsafe and requires unsafe block
-    .note = extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
-    .label = use of extern static
-
-mir_build_extern_static_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
-    use of extern static is unsafe and requires unsafe function or block
-    .note = extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
-    .label = use of extern static
-
-mir_build_deref_raw_pointer_requires_unsafe =
-    dereference of raw pointer is unsafe and requires unsafe block
-    .note = raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
-    .label = dereference of raw pointer
-
-mir_build_deref_raw_pointer_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
-    dereference of raw pointer is unsafe and requires unsafe function or block
-    .note = raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
-    .label = dereference of raw pointer
-
-mir_build_union_field_requires_unsafe =
-    access to union field is unsafe and requires unsafe block
-    .note = the field may not be properly initialized: using uninitialized data will cause undefined behavior
-    .label = access to union field
-
-mir_build_union_field_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
-    access to union field is unsafe and requires unsafe function or block
-    .note = the field may not be properly initialized: using uninitialized data will cause undefined behavior
-    .label = access to union field
-
-mir_build_mutation_of_layout_constrained_field_requires_unsafe =
-    mutation of layout constrained field is unsafe and requires unsafe block
-    .note = mutating layout constrained fields cannot statically be checked for valid values
-    .label = mutation of layout constrained field
-
-mir_build_mutation_of_layout_constrained_field_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
-    mutation of layout constrained field is unsafe and requires unsafe function or block
-    .note = mutating layout constrained fields cannot statically be checked for valid values
-    .label = mutation of layout constrained field
-
-mir_build_borrow_of_layout_constrained_field_requires_unsafe =
-    borrow of layout constrained field with interior mutability is unsafe and requires unsafe block
-    .note = references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values
-    .label = borrow of layout constrained field with interior mutability
-
-mir_build_borrow_of_layout_constrained_field_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
-    borrow of layout constrained field with interior mutability is unsafe and requires unsafe function or block
-    .note = references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values
-    .label = borrow of layout constrained field with interior mutability
-
-mir_build_call_to_fn_with_requires_unsafe =
-    call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe block
-    .note = can only be called if the required target features are available
-    .label = call to function with `#[target_feature]`
-
-mir_build_call_to_fn_with_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
-    call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe function or block
-    .note = can only be called if the required target features are available
-    .label = call to function with `#[target_feature]`
-
-mir_build_unused_unsafe = unnecessary `unsafe` block
-    .label = unnecessary `unsafe` block
-
-mir_build_unused_unsafe_enclosing_block_label = because it's nested under this `unsafe` block
-mir_build_unused_unsafe_enclosing_fn_label = because it's nested under this `unsafe` fn
-
-mir_build_non_exhaustive_patterns_type_not_empty = non-exhaustive patterns: type `{$ty}` is non-empty
-    .def_note = `{$peeled_ty}` defined here
-    .type_note = the matched value is of type `{$ty}`
-    .non_exhaustive_type_note = the matched value is of type `{$ty}`, which is marked as non-exhaustive
-    .reference_note = references are always considered inhabited
-    .suggestion = ensure that all possible cases are being handled by adding a match arm with a wildcard pattern as shown
-    .help = ensure that all possible cases are being handled by adding a match arm with a wildcard pattern
-
-mir_build_static_in_pattern = statics cannot be referenced in patterns
-
-mir_build_assoc_const_in_pattern = associated consts cannot be referenced in patterns
-
-mir_build_const_param_in_pattern = const parameters cannot be referenced in patterns
-
-mir_build_non_const_path = runtime values cannot be referenced in patterns
-
-mir_build_unreachable_pattern = unreachable pattern
-    .label = unreachable pattern
-    .catchall_label = matches any value
-
-mir_build_const_pattern_depends_on_generic_parameter =
-    constant pattern depends on a generic parameter
-
-mir_build_could_not_eval_const_pattern = could not evaluate constant pattern
-
-mir_build_lower_range_bound_must_be_less_than_or_equal_to_upper =
-    lower range bound must be less than or equal to upper
-    .label = lower bound larger than upper bound
-    .teach_note = When matching against a range, the compiler verifies that the range is non-empty. Range patterns include both end-points, so this is equivalent to requiring the start of the range to be less than or equal to the end of the range.
-
-mir_build_literal_in_range_out_of_bounds =
-    literal out of range for `{$ty}`
-    .label = this value doesn't fit in `{$ty}` whose maximum value is `{$max}`
-
-mir_build_lower_range_bound_must_be_less_than_upper = lower range bound must be less than upper
-
-mir_build_leading_irrefutable_let_patterns = leading irrefutable {$count ->
-        [one] pattern
-        *[other] patterns
-    } in let chain
-    .note = {$count ->
-        [one] this pattern
-        *[other] these patterns
-    } will always match
-    .help = consider moving {$count ->
-        [one] it
-        *[other] them
-    } outside of the construct
-
-mir_build_trailing_irrefutable_let_patterns = trailing irrefutable {$count ->
-        [one] pattern
-        *[other] patterns
-    } in let chain
-    .note = {$count ->
-        [one] this pattern
-        *[other] these patterns
-    } will always match
-    .help = consider moving {$count ->
-        [one] it
-        *[other] them
-    } into the body
-
-mir_build_bindings_with_variant_name =
-    pattern binding `{$ident}` is named the same as one of the variants of the type `{$ty_path}`
-    .suggestion = to match on the variant, qualify the path
-
-mir_build_irrefutable_let_patterns_generic_let = irrefutable `let` {$count ->
-        [one] pattern
-        *[other] patterns
-    }
-    .note = {$count ->
-        [one] this pattern
-        *[other] these patterns
-    } will always match, so the `let` is useless
-    .help = consider removing `let`
-
-mir_build_irrefutable_let_patterns_if_let = irrefutable `if let` {$count ->
-        [one] pattern
-        *[other] patterns
-    }
-    .note = {$count ->
-        [one] this pattern
-        *[other] these patterns
-    } will always match, so the `if let` is useless
-    .help = consider replacing the `if let` with a `let`
-
-mir_build_irrefutable_let_patterns_if_let_guard = irrefutable `if let` guard {$count ->
-        [one] pattern
-        *[other] patterns
-    }
-    .note = {$count ->
-        [one] this pattern
-        *[other] these patterns
-    } will always match, so the guard is useless
-    .help = consider removing the guard and adding a `let` inside the match arm
-
-mir_build_irrefutable_let_patterns_let_else = irrefutable `let...else` {$count ->
-        [one] pattern
-        *[other] patterns
-    }
-    .note = {$count ->
-        [one] this pattern
-        *[other] these patterns
-    } will always match, so the `else` clause is useless
-    .help = consider removing the `else` clause
-
-mir_build_irrefutable_let_patterns_while_let = irrefutable `while let` {$count ->
-        [one] pattern
-        *[other] patterns
-    }
-    .note = {$count ->
-        [one] this pattern
-        *[other] these patterns
-    } will always match, so the loop will never exit
-    .help = consider instead using a `loop {"{"} ... {"}"}` with a `let` inside it
-
-mir_build_borrow_of_moved_value = borrow of moved value
-    .label = value moved into `{$name}` here
-    .occurs_because_label = move occurs because `{$name}` has type `{$ty}` which does not implement the `Copy` trait
-    .value_borrowed_label = value borrowed here after move
-    .suggestion = borrow this binding in the pattern to avoid moving the value
-
-mir_build_multiple_mut_borrows = cannot borrow value as mutable more than once at a time
-
-mir_build_already_borrowed = cannot borrow value as mutable because it is also borrowed as immutable
-
-mir_build_already_mut_borrowed = cannot borrow value as immutable because it is also borrowed as mutable
-
-mir_build_moved_while_borrowed = cannot move out of value because it is borrowed
-
-mir_build_mutable_borrow = value is mutably borrowed by `{$name}` here
-
-mir_build_borrow = value is borrowed by `{$name}` here
-
-mir_build_moved = value is moved into `{$name}` here
-
-mir_build_union_pattern = cannot use unions in constant patterns
-
-mir_build_type_not_structural =
-     to use a constant of type `{$non_sm_ty}` in a pattern, `{$non_sm_ty}` must be annotated with `#[derive(PartialEq, Eq)]`
-
-mir_build_unsized_pattern = cannot use unsized non-slice type `{$non_sm_ty}` in constant patterns
-
-mir_build_invalid_pattern = `{$non_sm_ty}` cannot be used in patterns
-
-mir_build_float_pattern = floating-point types cannot be used in patterns
-
-mir_build_pointer_pattern = function pointers and unsized pointers in patterns behave unpredictably and should not be relied upon. See https://github.com/rust-lang/rust/issues/70861 for details.
-
-mir_build_indirect_structural_match =
-    to use a constant of type `{$non_sm_ty}` in a pattern, `{$non_sm_ty}` must be annotated with `#[derive(PartialEq, Eq)]`
-
-mir_build_nontrivial_structural_match =
-    to use a constant of type `{$non_sm_ty}` in a pattern, the constant's initializer must be trivial or `{$non_sm_ty}` must be annotated with `#[derive(PartialEq, Eq)]`
-
-mir_build_overlapping_range_endpoints = multiple patterns overlap on their endpoints
-    .range = ... with this range
-    .note = you likely meant to write mutually exclusive ranges
-
-mir_build_non_exhaustive_omitted_pattern = some variants are not matched explicitly
-    .help = ensure that all variants are matched explicitly by adding the suggested match arms
-    .note = the matched value is of type `{$scrut_ty}` and the `non_exhaustive_omitted_patterns` attribute was found
-
-mir_build_uncovered = {$count ->
-        [1] pattern `{$witness_1}`
-        [2] patterns `{$witness_1}` and `{$witness_2}`
-        [3] patterns `{$witness_1}`, `{$witness_2}` and `{$witness_3}`
-        *[other] patterns `{$witness_1}`, `{$witness_2}`, `{$witness_3}` and {$remainder} more
-    } not covered
-
-mir_build_pattern_not_covered = refutable pattern in {$origin}
-    .pattern_ty = the matched value is of type `{$pattern_ty}`
-
-mir_build_inform_irrefutable = `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
-
-mir_build_more_information = for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
-
-mir_build_res_defined_here = {$res} defined here
-
-mir_build_adt_defined_here = `{$ty}` defined here
-
-mir_build_variant_defined_here = not covered
-
-mir_build_interpreted_as_const = introduce a variable instead
-
-mir_build_confused = missing patterns are not covered because `{$variable}` is interpreted as {$article} {$res} pattern, not a new variable
-
-mir_build_suggest_if_let = you might want to use `if let` to ignore the {$count ->
-        [one] variant that isn't
-        *[other] variants that aren't
-    } matched
-
-mir_build_suggest_let_else = you might want to use `let else` to handle the {$count ->
-        [one] variant that isn't
-        *[other] variants that aren't
-    } matched
-
-mir_build_suggest_attempted_int_lit = alternatively, you could prepend the pattern with an underscore to define a new named variable; identifiers cannot begin with digits
diff --git a/compiler/rustc_error_messages/locales/en-US/mir_dataflow.ftl b/compiler/rustc_error_messages/locales/en-US/mir_dataflow.ftl
deleted file mode 100644
index 98854152508..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/mir_dataflow.ftl
+++ /dev/null
@@ -1,29 +0,0 @@
-mir_dataflow_path_must_end_in_filename =
-    path must end in a filename
-
-mir_dataflow_unknown_formatter =
-    unknown formatter
-
-mir_dataflow_duplicate_values_for =
-    duplicate values for `{$name}`
-
-mir_dataflow_requires_an_argument =
-    `{$name}` requires an argument
-
-mir_dataflow_stop_after_dataflow_ended_compilation =
-    stop_after_dataflow ended compilation
-
-mir_dataflow_peek_must_be_place_or_ref_place =
-    rustc_peek: argument expression must be either `place` or `&place`
-
-mir_dataflow_peek_must_be_not_temporary =
-    dataflow::sanity_check cannot feed a non-temp to rustc_peek
-
-mir_dataflow_peek_bit_not_set =
-    rustc_peek: bit not set
-
-mir_dataflow_peek_argument_not_a_local =
-    rustc_peek: argument was not a local
-
-mir_dataflow_peek_argument_untracked =
-    rustc_peek: argument untracked
diff --git a/compiler/rustc_error_messages/locales/en-US/monomorphize.ftl b/compiler/rustc_error_messages/locales/en-US/monomorphize.ftl
deleted file mode 100644
index 6cea6a603f3..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/monomorphize.ftl
+++ /dev/null
@@ -1,32 +0,0 @@
-monomorphize_recursion_limit =
-    reached the recursion limit while instantiating `{$shrunk}`
-    .note = `{$def_path_str}` defined here
-
-monomorphize_written_to_path = the full type name has been written to '{$path}'
-
-monomorphize_type_length_limit = reached the type-length limit while instantiating `{$shrunk}`
-
-monomorphize_consider_type_length_limit =
-    consider adding a `#![type_length_limit="{$type_length}"]` attribute to your crate
-
-monomorphize_fatal_error = {$error_message}
-
-monomorphize_unknown_partition_strategy = unknown partitioning strategy
-
-monomorphize_symbol_already_defined = symbol `{$symbol}` is already defined
-
-monomorphize_unused_generic_params = item has unused generic parameters
-
-monomorphize_large_assignments =
-    moving {$size} bytes
-    .label = value moved from here
-    .note = The current maximum size is {$limit}, but it can be customized with the move_size_limit attribute: `#![move_size_limit = "..."]`
-
-monomorphize_couldnt_dump_mono_stats =
-    unexpected error occurred while dumping monomorphization stats: {$error}
-
-monomorphize_encountered_error_while_instantiating =
-    the above error was encountered while instantiating `{$formatted_item}`
-
-monomorphize_unknown_cgu_collection_mode =
-    unknown codegen-item collection mode '{$mode}', falling back to 'lazy' mode
diff --git a/compiler/rustc_error_messages/locales/en-US/parse.ftl b/compiler/rustc_error_messages/locales/en-US/parse.ftl
deleted file mode 100644
index c9cf7b62071..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/parse.ftl
+++ /dev/null
@@ -1,702 +0,0 @@
-parse_struct_literal_body_without_path =
-    struct literal body without path
-    .suggestion = you might have forgotten to add the struct literal inside the block
-
-parse_struct_literal_needing_parens =
-    invalid struct literal
-    .suggestion = you might need to surround the struct literal in parentheses
-
-parse_maybe_report_ambiguous_plus =
-    ambiguous `+` in a type
-    .suggestion = use parentheses to disambiguate
-
-parse_maybe_recover_from_bad_type_plus =
-    expected a path on the left-hand side of `+`, not `{$ty}`
-
-parse_add_paren = try adding parentheses
-
-parse_forgot_paren = perhaps you forgot parentheses?
-
-parse_expect_path = expected a path
-
-parse_maybe_recover_from_bad_qpath_stage_2 =
-    missing angle brackets in associated item path
-    .suggestion = try: `{$ty}`
-
-parse_incorrect_semicolon =
-    expected item, found `;`
-    .suggestion = remove this semicolon
-    .help = {$name} declarations are not followed by a semicolon
-
-parse_incorrect_use_of_await =
-    incorrect use of `await`
-    .parentheses_suggestion = `await` is not a method call, remove the parentheses
-    .postfix_suggestion = `await` is a postfix operation
-
-parse_in_in_typo =
-    expected iterable, found keyword `in`
-    .suggestion = remove the duplicated `in`
-
-parse_invalid_variable_declaration =
-    invalid variable declaration
-
-parse_switch_mut_let_order =
-    switch the order of `mut` and `let`
-parse_missing_let_before_mut = missing keyword
-parse_use_let_not_auto = write `let` instead of `auto` to introduce a new variable
-parse_use_let_not_var = write `let` instead of `var` to introduce a new variable
-
-parse_invalid_comparison_operator = invalid comparison operator `{$invalid}`
-    .use_instead = `{$invalid}` is not a valid comparison operator, use `{$correct}`
-    .spaceship_operator_invalid = `<=>` is not a valid comparison operator, use `std::cmp::Ordering`
-
-parse_invalid_logical_operator = `{$incorrect}` is not a logical operator
-    .note = unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
-    .use_amp_amp_for_conjunction = use `&&` to perform logical conjunction
-    .use_pipe_pipe_for_disjunction = use `||` to perform logical disjunction
-
-parse_tilde_is_not_unary_operator = `~` cannot be used as a unary operator
-    .suggestion = use `!` to perform bitwise not
-
-parse_unexpected_if_with_if = unexpected `if` in the condition expression
-    .suggestion = remove the `if`
-
-parse_unexpected_token_after_not = unexpected {$negated_desc} after identifier
-parse_unexpected_token_after_not_bitwise = use `!` to perform bitwise not
-parse_unexpected_token_after_not_logical = use `!` to perform logical negation
-parse_unexpected_token_after_not_default = use `!` to perform logical negation or bitwise not
-
-parse_malformed_loop_label = malformed loop label
-    .suggestion = use the correct loop label format
-
-parse_lifetime_in_borrow_expression = borrow expressions cannot be annotated with lifetimes
-    .suggestion = remove the lifetime annotation
-    .label = annotated with lifetime here
-
-parse_field_expression_with_generic = field expressions cannot have generic arguments
-
-parse_macro_invocation_with_qualified_path = macros cannot use qualified paths
-
-parse_unexpected_token_after_label = expected `while`, `for`, `loop` or `{"{"}` after a label
-    .suggestion_remove_label = consider removing the label
-    .suggestion_enclose_in_block = consider enclosing expression in a block
-
-parse_require_colon_after_labeled_expression = labeled expression must be followed by `:`
-    .note = labels are used before loops and blocks, allowing e.g., `break 'label` to them
-    .label = the label
-    .suggestion = add `:` after the label
-
-parse_do_catch_syntax_removed = found removed `do catch` syntax
-    .note = following RFC #2388, the new non-placeholder syntax is `try`
-    .suggestion = replace with the new syntax
-
-parse_float_literal_requires_integer_part = float literals must have an integer part
-    .suggestion = must have an integer part
-
-parse_missing_semicolon_before_array = expected `;`, found `[`
-    .suggestion = consider adding `;` here
-
-parse_invalid_block_macro_segment = cannot use a `block` macro fragment here
-    .label = the `block` fragment is within this context
-
-parse_expect_dotdot_not_dotdotdot = expected `..`, found `...`
-    .suggestion = use `..` to fill in the rest of the fields
-
-parse_if_expression_missing_then_block = this `if` expression is missing a block after the condition
-    .add_then_block = add a block here
-    .condition_possibly_unfinished = this binary operation is possibly unfinished
-
-parse_if_expression_missing_condition = missing condition for `if` expression
-    .condition_label = expected condition here
-    .block_label = if this block is the condition of the `if` expression, then it must be followed by another block
-
-parse_expected_expression_found_let = expected expression, found `let` statement
-
-parse_expect_eq_instead_of_eqeq = expected `=`, found `==`
-    .suggestion = consider using `=` here
-
-parse_expected_else_block = expected `{"{"}`, found {$first_tok}
-    .label = expected an `if` or a block after this `else`
-    .suggestion = add an `if` if this is the condition of a chained `else if` statement
-
-parse_outer_attribute_not_allowed_on_if_else = outer attributes are not allowed on `if` and `else` branches
-    .branch_label = the attributes are attached to this branch
-    .ctx_label = the branch belongs to this `{$ctx}`
-    .suggestion = remove the attributes
-
-parse_missing_in_in_for_loop = missing `in` in `for` loop
-    .use_in_not_of = try using `in` here instead
-    .add_in = try adding `in` here
-
-parse_missing_expression_in_for_loop = missing expression to iterate on in `for` loop
-    .suggestion = try adding an expression to the `for` loop
-
-parse_missing_comma_after_match_arm = expected `,` following `match` arm
-    .suggestion = missing a comma here to end this `match` arm
-
-parse_catch_after_try = keyword `catch` cannot follow a `try` block
-    .help = try using `match` on the result of the `try` block instead
-
-parse_comma_after_base_struct = cannot use a comma after the base struct
-    .note = the base struct must always be the last field
-    .suggestion = remove this comma
-
-parse_eq_field_init = expected `:`, found `=`
-    .suggestion = replace equals symbol with a colon
-
-parse_dotdotdot = unexpected token: `...`
-    .suggest_exclusive_range = use `..` for an exclusive range
-    .suggest_inclusive_range = or `..=` for an inclusive range
-
-parse_left_arrow_operator = unexpected token: `<-`
-    .suggestion = if you meant to write a comparison against a negative value, add a space in between `<` and `-`
-
-parse_remove_let = expected pattern, found `let`
-    .suggestion = remove the unnecessary `let` keyword
-
-parse_use_eq_instead = unexpected `==`
-    .suggestion = try using `=` instead
-
-parse_use_empty_block_not_semi = expected { "`{}`" }, found `;`
-    .suggestion = try using { "`{}`" } instead
-
-parse_comparison_interpreted_as_generic =
-    `<` is interpreted as a start of generic arguments for `{$type}`, not a comparison
-    .label_args = interpreted as generic arguments
-    .label_comparison = not interpreted as comparison
-    .suggestion = try comparing the cast value
-
-parse_shift_interpreted_as_generic =
-    `<<` is interpreted as a start of generic arguments for `{$type}`, not a shift
-    .label_args = interpreted as generic arguments
-    .label_comparison = not interpreted as shift
-    .suggestion = try shifting the cast value
-
-parse_found_expr_would_be_stmt = expected expression, found `{$token}`
-    .label = expected expression
-
-parse_leading_plus_not_supported = leading `+` is not supported
-    .label = unexpected `+`
-    .suggestion_remove_plus = try removing the `+`
-
-parse_parentheses_with_struct_fields = invalid `struct` delimiters or `fn` call arguments
-    .suggestion_braces_for_struct = if `{$type}` is a struct, use braces as delimiters
-    .suggestion_no_fields_for_fn = if `{$type}` is a function, use the arguments directly
-
-parse_labeled_loop_in_break = parentheses are required around this expression to avoid confusion with a labeled break expression
-
-parse_sugg_wrap_expression_in_parentheses = wrap the expression in parentheses
-
-parse_array_brackets_instead_of_braces = this is a block expression, not an array
-    .suggestion = to make an array, use square brackets instead of curly braces
-
-parse_match_arm_body_without_braces = `match` arm body without braces
-    .label_statements = {$num_statements ->
-            [one] this statement is not surrounded by a body
-           *[other] these statements are not surrounded by a body
-        }
-    .label_arrow = while parsing the `match` arm starting here
-    .suggestion_add_braces = surround the {$num_statements ->
-            [one] statement
-           *[other] statements
-        } with a body
-    .suggestion_use_comma_not_semicolon = use a comma to end a `match` arm expression
-
-parse_inclusive_range_extra_equals = unexpected `=` after inclusive range
-    .suggestion_remove_eq = use `..=` instead
-    .note = inclusive ranges end with a single equals sign (`..=`)
-
-parse_inclusive_range_match_arrow = unexpected `>` after inclusive range
-    .label = this is parsed as an inclusive range `..=`
-    .suggestion = add a space between the pattern and `=>`
-
-parse_inclusive_range_no_end = inclusive range with no end
-    .suggestion_open_range = use `..` instead
-    .note = inclusive ranges must be bounded at the end (`..=b` or `a..=b`)
-
-parse_struct_literal_not_allowed_here = struct literals are not allowed here
-    .suggestion = surround the struct literal with parentheses
-
-parse_invalid_interpolated_expression = invalid interpolated expression
-
-parse_invalid_literal_suffix_on_tuple_index = suffixes on a tuple index are invalid
-    .label = invalid suffix `{$suffix}`
-    .tuple_exception_line_1 = `{$suffix}` is *temporarily* accepted on tuple index fields as it was incorrectly accepted on stable for a few releases
-    .tuple_exception_line_2 = on proc macros, you'll want to use `syn::Index::from` or `proc_macro::Literal::*_unsuffixed` for code that will desugar to tuple field access
-    .tuple_exception_line_3 = see issue #60210 <https://github.com/rust-lang/rust/issues/60210> for more information
-
-parse_non_string_abi_literal = non-string ABI literal
-    .suggestion = specify the ABI with a string literal
-
-parse_mismatched_closing_delimiter = mismatched closing delimiter: `{$delimiter}`
-    .label_unmatched = mismatched closing delimiter
-    .label_opening_candidate = closing delimiter possibly meant for this
-    .label_unclosed = unclosed delimiter
-
-parse_incorrect_visibility_restriction = incorrect visibility restriction
-    .help = some possible visibility restrictions are:
-            `pub(crate)`: visible only on the current crate
-            `pub(super)`: visible only in the current module's parent
-            `pub(in path::to::module)`: visible only on the specified path
-    .suggestion = make this visible only to module `{$inner_str}` with `in`
-
-parse_assignment_else_not_allowed = <assignment> ... else {"{"} ... {"}"} is not allowed
-
-parse_expected_statement_after_outer_attr = expected statement after outer attribute
-
-parse_doc_comment_does_not_document_anything = found a documentation comment that doesn't document anything
-    .help = doc comments must come before what they document, if a comment was intended use `//`
-    .suggestion = missing comma here
-
-parse_const_let_mutually_exclusive = `const` and `let` are mutually exclusive
-    .suggestion = remove `let`
-
-parse_invalid_expression_in_let_else = a `{$operator}` expression cannot be directly assigned in `let...else`
-parse_invalid_curly_in_let_else = right curly brace `{"}"}` before `else` in a `let...else` statement not allowed
-parse_extra_if_in_let_else = remove the `if` if you meant to write a `let...else` statement
-
-parse_compound_assignment_expression_in_let = can't reassign to an uninitialized variable
-    .suggestion = initialize the variable
-    .help = if you meant to overwrite, remove the `let` binding
-
-parse_suffixed_literal_in_attribute = suffixed literals are not allowed in attributes
-    .help = instead of using a suffixed literal (`1u8`, `1.0f32`, etc.), use an unsuffixed version (`1`, `1.0`, etc.)
-
-parse_invalid_meta_item = expected unsuffixed literal or identifier, found `{$token}`
-
-parse_label_inner_attr_does_not_annotate_this = the inner attribute doesn't annotate this {$item}
-parse_sugg_change_inner_attr_to_outer = to annotate the {$item}, change the attribute from inner to outer style
-
-parse_inner_attr_not_permitted_after_outer_doc_comment = an inner attribute is not permitted following an outer doc comment
-    .label_attr = not permitted following an outer doc comment
-    .label_prev_doc_comment = previous doc comment
-    .label_does_not_annotate_this = {parse_label_inner_attr_does_not_annotate_this}
-    .sugg_change_inner_to_outer = {parse_sugg_change_inner_attr_to_outer}
-
-parse_inner_attr_not_permitted_after_outer_attr = an inner attribute is not permitted following an outer attribute
-    .label_attr = not permitted following an outer attribute
-    .label_prev_attr = previous outer attribute
-    .label_does_not_annotate_this = {parse_label_inner_attr_does_not_annotate_this}
-    .sugg_change_inner_to_outer = {parse_sugg_change_inner_attr_to_outer}
-
-parse_inner_attr_not_permitted = an inner attribute is not permitted in this context
-    .label_does_not_annotate_this = {parse_label_inner_attr_does_not_annotate_this}
-    .sugg_change_inner_to_outer = {parse_sugg_change_inner_attr_to_outer}
-
-parse_inner_attr_explanation = inner attributes, like `#![no_std]`, annotate the item enclosing them, and are usually found at the beginning of source files
-parse_outer_attr_explanation = outer attributes, like `#[test]`, annotate the item following them
-
-parse_inner_doc_comment_not_permitted = expected outer doc comment
-    .note = inner doc comments like this (starting with `//!` or `/*!`) can only appear before items
-    .suggestion = you might have meant to write a regular comment
-    .label_does_not_annotate_this = the inner doc comment doesn't annotate this {$item}
-    .sugg_change_inner_to_outer = to annotate the {$item}, change the doc comment from inner to outer style
-
-parse_expected_identifier_found_reserved_identifier_str = expected identifier, found reserved identifier `{$token}`
-parse_expected_identifier_found_keyword_str = expected identifier, found keyword `{$token}`
-parse_expected_identifier_found_reserved_keyword_str = expected identifier, found reserved keyword `{$token}`
-parse_expected_identifier_found_doc_comment_str = expected identifier, found doc comment `{$token}`
-parse_expected_identifier_found_str = expected identifier, found `{$token}`
-
-parse_expected_identifier_found_reserved_identifier = expected identifier, found reserved identifier
-parse_expected_identifier_found_keyword = expected identifier, found keyword
-parse_expected_identifier_found_reserved_keyword = expected identifier, found reserved keyword
-parse_expected_identifier_found_doc_comment = expected identifier, found doc comment
-parse_expected_identifier = expected identifier
-
-parse_sugg_escape_to_use_as_identifier = escape `{$ident_name}` to use it as an identifier
-
-parse_sugg_remove_comma = remove this comma
-
-parse_expected_semi_found_reserved_identifier_str = expected `;`, found reserved identifier `{$token}`
-parse_expected_semi_found_keyword_str = expected `;`, found keyword `{$token}`
-parse_expected_semi_found_reserved_keyword_str = expected `;`, found reserved keyword `{$token}`
-parse_expected_semi_found_doc_comment_str = expected `;`, found doc comment `{$token}`
-parse_expected_semi_found_str = expected `;`, found `{$token}`
-
-parse_sugg_change_this_to_semi = change this to `;`
-parse_sugg_add_semi = add `;` here
-parse_label_unexpected_token = unexpected token
-
-parse_unmatched_angle_brackets = {$num_extra_brackets ->
-        [one] unmatched angle bracket
-       *[other] unmatched angle brackets
-    }
-    .suggestion = {$num_extra_brackets ->
-            [one] remove extra angle bracket
-           *[other] remove extra angle brackets
-        }
-
-parse_generic_parameters_without_angle_brackets = generic parameters without surrounding angle brackets
-    .suggestion = surround the type parameters with angle brackets
-
-parse_comparison_operators_cannot_be_chained = comparison operators cannot be chained
-    .sugg_parentheses_for_function_args = or use `(...)` if you meant to specify fn arguments
-    .sugg_split_comparison = split the comparison into two
-    .sugg_parenthesize = parenthesize the comparison
-parse_sugg_turbofish_syntax = use `::<...>` instead of `<...>` to specify lifetime, type, or const arguments
-
-parse_question_mark_in_type = invalid `?` in type
-    .label = `?` is only allowed on expressions, not types
-    .suggestion = if you meant to express that the type might not contain a value, use the `Option` wrapper type
-
-parse_unexpected_parentheses_in_for_head = unexpected parentheses surrounding `for` loop head
-    .suggestion = remove parentheses in `for` loop
-
-parse_doc_comment_on_param_type = documentation comments cannot be applied to a function parameter's type
-    .label = doc comments are not allowed here
-
-parse_attribute_on_param_type = attributes cannot be applied to a function parameter's type
-    .label = attributes are not allowed here
-
-parse_pattern_method_param_without_body = patterns aren't allowed in methods without bodies
-    .suggestion = give this argument a name or use an underscore to ignore it
-
-parse_self_param_not_first = unexpected `self` parameter in function
-    .label = must be the first parameter of an associated function
-
-parse_const_generic_without_braces = expressions must be enclosed in braces to be used as const generic arguments
-    .suggestion = enclose the `const` expression in braces
-
-parse_unexpected_const_param_declaration = unexpected `const` parameter declaration
-    .label = expected a `const` expression, not a parameter declaration
-    .suggestion = `const` parameters must be declared for the `impl`
-
-parse_unexpected_const_in_generic_param = expected lifetime, type, or constant, found keyword `const`
-    .suggestion = the `const` keyword is only needed in the definition of the type
-
-parse_async_move_order_incorrect = the order of `move` and `async` is incorrect
-    .suggestion = try switching the order
-
-parse_double_colon_in_bound = expected `:` followed by trait or lifetime
-    .suggestion = use single colon
-
-parse_fn_ptr_with_generics = function pointer types may not have generic parameters
-    .suggestion = consider moving the lifetime {$arity ->
-        [one] parameter
-        *[other] parameters
-    } to {$for_param_list_exists ->
-        [true] the
-        *[false] a
-    } `for` parameter list
-
-parse_invalid_identifier_with_leading_number = expected identifier, found number literal
-    .label = identifiers cannot start with a number
-
-parse_maybe_fn_typo_with_impl = you might have meant to write `impl` instead of `fn`
-    .suggestion = replace `fn` with `impl` here
-
-parse_expected_fn_path_found_fn_keyword = expected identifier, found keyword `fn`
-    .suggestion = use `Fn` to refer to the trait
-
-parse_where_clause_before_tuple_struct_body = where clauses are not allowed before tuple struct bodies
-    .label = unexpected where clause
-    .name_label = while parsing this tuple struct
-    .body_label = the struct body
-    .suggestion = move the body before the where clause
-
-parse_async_fn_in_2015 = `async fn` is not permitted in Rust 2015
-    .label = to use `async fn`, switch to Rust 2018 or later
-
-parse_async_block_in_2015 = `async` blocks are only allowed in Rust 2018 or later
-
-parse_self_argument_pointer = cannot pass `self` by raw pointer
-    .label = cannot pass `self` by raw pointer
-
-parse_visibility_not_followed_by_item = visibility `{$vis}` is not followed by an item
-    .label = the visibility
-    .help = you likely meant to define an item, e.g., `{$vis} fn foo() {"{}"}`
-
-parse_default_not_followed_by_item = `default` is not followed by an item
-    .label = the `default` qualifier
-    .note = only `fn`, `const`, `type`, or `impl` items may be prefixed by `default`
-
-parse_missing_struct_for_struct_definition = missing `struct` for struct definition
-    .suggestion = add `struct` here to parse `{$ident}` as a public struct
-
-parse_missing_fn_for_function_definition = missing `fn` for function definition
-    .suggestion = add `fn` here to parse `{$ident}` as a public function
-
-parse_missing_fn_for_method_definition = missing `fn` for method definition
-    .suggestion = add `fn` here to parse `{$ident}` as a public method
-
-parse_ambiguous_missing_keyword_for_item_definition = missing `fn` or `struct` for function or struct definition
-    .suggestion = if you meant to call a macro, try
-    .help = if you meant to call a macro, remove the `pub` and add a trailing `!` after the identifier
-
-parse_missing_trait_in_trait_impl = missing trait in a trait impl
-    .suggestion_add_trait = add a trait here
-    .suggestion_remove_for = for an inherent impl, drop this `for`
-
-parse_missing_for_in_trait_impl = missing `for` in a trait impl
-    .suggestion = add `for` here
-
-parse_expected_trait_in_trait_impl_found_type = expected a trait, found type
-
-parse_non_item_in_item_list = non-item in item list
-    .suggestion_use_const_not_let = consider using `const` instead of `let` for associated const
-    .label_list_start = item list starts here
-    .label_non_item = non-item starts here
-    .label_list_end = item list ends here
-    .suggestion_remove_semicolon = consider removing this semicolon
-
-parse_bounds_not_allowed_on_trait_aliases = bounds are not allowed on trait aliases
-
-parse_trait_alias_cannot_be_auto = trait aliases cannot be `auto`
-parse_trait_alias_cannot_be_unsafe = trait aliases cannot be `unsafe`
-
-parse_associated_static_item_not_allowed = associated `static` items are not allowed
-
-parse_extern_crate_name_with_dashes = crate name using dashes are not valid in `extern crate` statements
-    .label = dash-separated idents are not valid
-    .suggestion = if the original crate name uses dashes you need to use underscores in the code
-
-parse_extern_item_cannot_be_const = extern items cannot be `const`
-    .suggestion = try using a static value
-    .note = for more information, visit https://doc.rust-lang.org/std/keyword.extern.html
-
-parse_const_global_cannot_be_mutable = const globals cannot be mutable
-    .label = cannot be mutable
-    .suggestion = you might want to declare a static instead
-
-parse_missing_const_type = missing type for `{$kind}` item
-    .suggestion = provide a type for the item
-
-parse_enum_struct_mutually_exclusive = `enum` and `struct` are mutually exclusive
-    .suggestion = replace `enum struct` with
-
-parse_unexpected_token_after_struct_name = expected `where`, `{"{"}`, `(`, or `;` after struct name
-parse_unexpected_token_after_struct_name_found_reserved_identifier = expected `where`, `{"{"}`, `(`, or `;` after struct name, found reserved identifier `{$token}`
-parse_unexpected_token_after_struct_name_found_keyword = expected `where`, `{"{"}`, `(`, or `;` after struct name, found keyword `{$token}`
-parse_unexpected_token_after_struct_name_found_reserved_keyword = expected `where`, `{"{"}`, `(`, or `;` after struct name, found reserved keyword `{$token}`
-parse_unexpected_token_after_struct_name_found_doc_comment = expected `where`, `{"{"}`, `(`, or `;` after struct name, found doc comment `{$token}`
-parse_unexpected_token_after_struct_name_found_other = expected `where`, `{"{"}`, `(`, or `;` after struct name, found `{$token}`
-
-parse_unexpected_self_in_generic_parameters = unexpected keyword `Self` in generic parameters
-    .note = you cannot use `Self` as a generic parameter because it is reserved for associated items
-
-parse_unexpected_default_value_for_lifetime_in_generic_parameters = unexpected default lifetime parameter
-    .label = lifetime parameters cannot have default values
-
-parse_multiple_where_clauses = cannot define duplicate `where` clauses on an item
-    .label = previous `where` clause starts here
-    .suggestion = consider joining the two `where` clauses into one
-
-parse_nonterminal_expected_item_keyword = expected an item keyword
-parse_nonterminal_expected_statement = expected a statement
-parse_nonterminal_expected_ident = expected ident, found `{$token}`
-parse_nonterminal_expected_lifetime = expected a lifetime, found `{$token}`
-
-parse_or_pattern_not_allowed_in_let_binding = top-level or-patterns are not allowed in `let` bindings
-parse_or_pattern_not_allowed_in_fn_parameters = top-level or-patterns are not allowed in function parameters
-parse_sugg_remove_leading_vert_in_pattern = remove the `|`
-parse_sugg_wrap_pattern_in_parens = wrap the pattern in parentheses
-
-parse_note_pattern_alternatives_use_single_vert = alternatives in or-patterns are separated with `|`, not `||`
-
-parse_unexpected_vert_vert_before_function_parameter = unexpected `||` before function parameter
-    .suggestion = remove the `||`
-
-parse_label_while_parsing_or_pattern_here = while parsing this or-pattern starting here
-
-parse_unexpected_vert_vert_in_pattern = unexpected token `||` in pattern
-    .suggestion = use a single `|` to separate multiple alternative patterns
-
-parse_trailing_vert_not_allowed = a trailing `|` is not allowed in an or-pattern
-    .suggestion = remove the `{$token}`
-
-parse_dotdotdot_rest_pattern = unexpected `...`
-    .label = not a valid pattern
-    .suggestion = for a rest pattern, use `..` instead of `...`
-
-parse_pattern_on_wrong_side_of_at = pattern on wrong side of `@`
-    .label_pattern = pattern on the left, should be on the right
-    .label_binding = binding on the right, should be on the left
-    .suggestion = switch the order
-
-parse_expected_binding_left_of_at = left-hand side of `@` must be a binding
-    .label_lhs = interpreted as a pattern, not a binding
-    .label_rhs = also a pattern
-    .note = bindings are `x`, `mut x`, `ref x`, and `ref mut x`
-
-parse_ambiguous_range_pattern = the range pattern here has ambiguous interpretation
-    .suggestion = add parentheses to clarify the precedence
-
-parse_unexpected_lifetime_in_pattern = unexpected lifetime `{$symbol}` in pattern
-    .suggestion = remove the lifetime
-
-parse_ref_mut_order_incorrect = the order of `mut` and `ref` is incorrect
-    .suggestion = try switching the order
-
-parse_mut_on_nested_ident_pattern = `mut` must be attached to each individual binding
-    .suggestion = add `mut` to each binding
-parse_mut_on_non_ident_pattern = `mut` must be followed by a named binding
-    .suggestion = remove the `mut` prefix
-parse_note_mut_pattern_usage = `mut` may be followed by `variable` and `variable @ pattern`
-
-parse_repeated_mut_in_pattern = `mut` on a binding may not be repeated
-    .suggestion = remove the additional `mut`s
-
-parse_dot_dot_dot_range_to_pattern_not_allowed = range-to patterns with `...` are not allowed
-    .suggestion = use `..=` instead
-
-parse_enum_pattern_instead_of_identifier = expected identifier, found enum pattern
-
-parse_dot_dot_dot_for_remaining_fields = expected field pattern, found `{$token_str}`
-    .suggestion = to omit remaining fields, use `..`
-
-parse_expected_comma_after_pattern_field = expected `,`
-
-parse_return_types_use_thin_arrow = return types are denoted using `->`
-    .suggestion = use `->` instead
-
-parse_need_plus_after_trait_object_lifetime = lifetime in trait object type must be followed by `+`
-
-parse_expected_mut_or_const_in_raw_pointer_type = expected `mut` or `const` keyword in raw pointer type
-    .suggestion = add `mut` or `const` here
-
-parse_lifetime_after_mut = lifetime must precede `mut`
-    .suggestion = place the lifetime before `mut`
-
-parse_dyn_after_mut = `mut` must precede `dyn`
-    .suggestion = place `mut` before `dyn`
-
-parse_fn_pointer_cannot_be_const = an `fn` pointer type cannot be `const`
-    .label = `const` because of this
-    .suggestion = remove the `const` qualifier
-
-parse_fn_pointer_cannot_be_async = an `fn` pointer type cannot be `async`
-    .label = `async` because of this
-    .suggestion = remove the `async` qualifier
-
-parse_nested_c_variadic_type = C-variadic type `...` may not be nested inside another type
-
-parse_invalid_dyn_keyword = invalid `dyn` keyword
-    .help = `dyn` is only needed at the start of a trait `+`-separated list
-    .suggestion = remove this keyword
-
-parse_negative_bounds_not_supported = negative bounds are not supported
-    .label = negative bounds are not supported
-    .suggestion = {$num_bounds ->
-            [one] remove the bound
-           *[other] remove the bounds
-        }
-
-parse_help_set_edition_cargo = set `edition = "{$edition}"` in `Cargo.toml`
-parse_help_set_edition_standalone = pass `--edition {$edition}` to `rustc`
-parse_note_edition_guide = for more on editions, read https://doc.rust-lang.org/edition-guide
-
-parse_unexpected_token_after_dot = unexpected token: `{$actual}`
-
-parse_cannot_be_raw_ident = `{$ident}` cannot be a raw identifier
-
-parse_cr_doc_comment = bare CR not allowed in {$block ->
-    [true] block doc-comment
-    *[false] doc-comment
-}
-
-parse_no_digits_literal = no valid digits found for number
-
-parse_invalid_digit_literal = invalid digit for a base {$base} literal
-
-parse_empty_exponent_float = expected at least one digit in exponent
-
-parse_float_literal_unsupported_base = {$base} float literal is not supported
-
-parse_more_than_one_char = character literal may only contain one codepoint
-    .followed_by = this `{$chr}` is followed by the combining {$len ->
-        [one] mark
-        *[other] marks
-        } `{$escaped_marks}`
-    .non_printing = there are non-printing characters, the full sequence is `{$escaped}`
-    .consider_normalized = consider using the normalized form `{$ch}` of this character
-    .remove_non = consider removing the non-printing characters
-    .use_double_quotes = if you meant to write a {$is_byte ->
-        [true] byte string
-        *[false] `str`
-        } literal, use double quotes
-
-parse_no_brace_unicode_escape = incorrect unicode escape sequence
-    .label = {parse_no_brace_unicode_escape}
-    .use_braces = format of unicode escape sequences uses braces
-    .format_of_unicode = format of unicode escape sequences is `\u{"{...}"}`
-
-parse_invalid_unicode_escape = invalid unicode character escape
-    .label = invalid escape
-    .help = unicode escape must {$surrogate ->
-    [true] not be a surrogate
-    *[false] be at most 10FFFF
-    }
-
-parse_escape_only_char = {$byte ->
-    [true] byte
-    *[false] character
-    } constant must be escaped: `{$escaped_msg}`
-    .escape = escape the character
-
-parse_bare_cr = {$double_quotes ->
-    [true] bare CR not allowed in string, use `\r` instead
-    *[false] character constant must be escaped: `\r`
-    }
-    .escape = escape the character
-
-parse_bare_cr_in_raw_string = bare CR not allowed in raw string
-
-parse_too_short_hex_escape = numeric character escape is too short
-
-parse_invalid_char_in_escape = {parse_invalid_char_in_escape_msg}: `{$ch}`
-    .label = {parse_invalid_char_in_escape_msg}
-
-parse_invalid_char_in_escape_msg = invalid character in {$is_hex ->
-    [true] numeric character
-    *[false] unicode
-    } escape
-
-parse_out_of_range_hex_escape = out of range hex escape
-    .label = must be a character in the range [\x00-\x7f]
-
-parse_leading_underscore_unicode_escape = {parse_leading_underscore_unicode_escape_label}: `_`
-parse_leading_underscore_unicode_escape_label = invalid start of unicode escape
-
-parse_overlong_unicode_escape = overlong unicode escape
-    .label = must have at most 6 hex digits
-
-parse_unclosed_unicode_escape = unterminated unicode escape
-    .label = missing a closing `{"}"}`
-    .terminate = terminate the unicode escape
-
-parse_unicode_escape_in_byte = unicode escape in byte string
-    .label = {parse_unicode_escape_in_byte}
-    .help = unicode escape sequences cannot be used as a byte or in a byte string
-
-parse_empty_unicode_escape = empty unicode escape
-    .label = this escape must have at least 1 hex digit
-
-parse_zero_chars = empty character literal
-    .label = {parse_zero_chars}
-
-parse_lone_slash = invalid trailing slash in literal
-    .label = {parse_lone_slash}
-
-parse_unskipped_whitespace = non-ASCII whitespace symbol '{$ch}' is not skipped
-    .label = {parse_unskipped_whitespace}
-
-parse_multiple_skipped_lines = multiple lines skipped by escaped newline
-    .label = skipping everything up to and including this point
-
-parse_unknown_prefix = prefix `{$prefix}` is unknown
-    .label = unknown prefix
-    .note =  prefixed identifiers and literals are reserved since Rust 2021
-    .suggestion_br = use `br` for a raw byte string
-    .suggestion_whitespace = consider inserting whitespace here
-
-parse_too_many_hashes = too many `#` symbols: raw strings may be delimited by up to 255 `#` symbols, but found {$num}
-
-parse_unknown_start_of_token = unknown start of token: {$escaped}
-    .sugg_quotes = Unicode characters '“' (Left Double Quotation Mark) and '”' (Right Double Quotation Mark) look like '{$ascii_str}' ({$ascii_name}), but are not
-    .sugg_other = Unicode character '{$ch}' ({$u_name}) looks like '{$ascii_str}' ({$ascii_name}), but it is not
-    .help_null = source files must contain UTF-8 encoded text, unexpected null bytes might occur when a different encoding is used
-    .note_repeats = character appears {$repeats ->
-        [one] once more
-        *[other] {$repeats} more times
-    }
diff --git a/compiler/rustc_error_messages/locales/en-US/passes.ftl b/compiler/rustc_error_messages/locales/en-US/passes.ftl
deleted file mode 100644
index 0c7e02912d4..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/passes.ftl
+++ /dev/null
@@ -1,747 +0,0 @@
--passes_previously_accepted =
-    this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-
--passes_see_issue =
-    see issue #{$issue} <https://github.com/rust-lang/rust/issues/{$issue}> for more information
-
-passes_incorrect_do_not_recommend_location =
-    `#[do_not_recommend]` can only be placed on trait implementations
-
-passes_outer_crate_level_attr =
-    crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
-
-passes_inner_crate_level_attr =
-    crate-level attribute should be in the root module
-
-passes_ignored_attr_with_macro =
-    `#[{$sym}]` is ignored on struct fields, match arms and macro defs
-    .warn = {-passes_previously_accepted}
-    .note = {-passes_see_issue(issue: "80564")}
-
-passes_ignored_attr =
-    `#[{$sym}]` is ignored on struct fields and match arms
-    .warn = {-passes_previously_accepted}
-    .note = {-passes_see_issue(issue: "80564")}
-
-passes_inline_ignored_function_prototype =
-    `#[inline]` is ignored on function prototypes
-
-passes_inline_ignored_constants =
-    `#[inline]` is ignored on constants
-    .warn = {-passes_previously_accepted}
-    .note = {-passes_see_issue(issue: "65833")}
-
-passes_inline_not_fn_or_closure =
-    attribute should be applied to function or closure
-    .label = not a function or closure
-
-passes_no_coverage_ignored_function_prototype =
-    `#[no_coverage]` is ignored on function prototypes
-
-passes_no_coverage_propagate =
-    `#[no_coverage]` does not propagate into items and must be applied to the contained functions directly
-
-passes_no_coverage_fn_defn =
-    `#[no_coverage]` may only be applied to function definitions
-
-passes_no_coverage_not_coverable =
-    `#[no_coverage]` must be applied to coverable code
-    .label = not coverable code
-
-passes_should_be_applied_to_fn =
-    attribute should be applied to a function definition
-    .label = {$on_crate ->
-        [true] cannot be applied to crates
-        *[false] not a function definition
-    }
-
-passes_naked_tracked_caller =
-    cannot use `#[track_caller]` with `#[naked]`
-
-passes_should_be_applied_to_struct_enum =
-    attribute should be applied to a struct or enum
-    .label = not a struct or enum
-
-passes_should_be_applied_to_trait =
-    attribute should be applied to a trait
-    .label = not a trait
-
-passes_target_feature_on_statement =
-    {passes_should_be_applied_to_fn}
-    .warn = {-passes_previously_accepted}
-    .label = {passes_should_be_applied_to_fn.label}
-
-passes_should_be_applied_to_static =
-    attribute should be applied to a static
-    .label = not a static
-
-passes_doc_expect_str =
-    doc {$attr_name} attribute expects a string: #[doc({$attr_name} = "a")]
-
-passes_doc_alias_empty =
-    {$attr_str} attribute cannot have empty value
-
-passes_doc_alias_bad_char =
-    {$char_} character isn't allowed in {$attr_str}
-
-passes_doc_alias_start_end =
-    {$attr_str} cannot start or end with ' '
-
-passes_doc_alias_bad_location =
-    {$attr_str} isn't allowed on {$location}
-
-passes_doc_alias_not_an_alias =
-    {$attr_str} is the same as the item's name
-
-passes_doc_alias_duplicated = doc alias is duplicated
-    .label = first defined here
-
-passes_doc_alias_not_string_literal =
-    `#[doc(alias("a"))]` expects string literals
-
-passes_doc_alias_malformed =
-    doc alias attribute expects a string `#[doc(alias = "a")]` or a list of strings `#[doc(alias("a", "b"))]`
-
-passes_doc_keyword_empty_mod =
-    `#[doc(keyword = "...")]` should be used on empty modules
-
-passes_doc_keyword_not_mod =
-    `#[doc(keyword = "...")]` should be used on modules
-
-passes_doc_keyword_invalid_ident =
-    `{$doc_keyword}` is not a valid identifier
-
-passes_doc_fake_variadic_not_valid =
-    `#[doc(fake_variadic)]` must be used on the first of a set of tuple or fn pointer trait impls with varying arity
-
-passes_doc_keyword_only_impl =
-    `#[doc(keyword = "...")]` should be used on impl blocks
-
-passes_doc_inline_conflict_first =
-    this attribute...
-
-passes_doc_inline_conflict_second =
-    {"."}..conflicts with this attribute
-
-passes_doc_inline_conflict =
-    conflicting doc inlining attributes
-    .help = remove one of the conflicting attributes
-
-passes_doc_inline_only_use =
-    this attribute can only be applied to a `use` item
-    .label = only applicable on `use` items
-    .not_a_use_item_label = not a `use` item
-    .note = read <https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#inline-and-no_inline> for more information
-
-passes_doc_attr_not_crate_level =
-    `#![doc({$attr_name} = "...")]` isn't allowed as a crate-level attribute
-
-passes_attr_crate_level =
-    this attribute can only be applied at the crate level
-    .suggestion = to apply to the crate, use an inner attribute
-    .help = to apply to the crate, use an inner attribute
-    .note = read <https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#at-the-crate-level> for more information
-
-passes_doc_test_unknown =
-    unknown `doc(test)` attribute `{$path}`
-
-passes_doc_test_takes_list =
-    `#[doc(test(...)]` takes a list of attributes
-
-passes_doc_primitive =
-    `doc(primitive)` should never have been stable
-
-passes_doc_cfg_hide_takes_list =
-    `#[doc(cfg_hide(...)]` takes a list of attributes
-
-passes_doc_test_unknown_any =
-    unknown `doc` attribute `{$path}`
-
-passes_doc_test_unknown_spotlight =
-    unknown `doc` attribute `{$path}`
-    .note = `doc(spotlight)` was renamed to `doc(notable_trait)`
-    .suggestion = use `notable_trait` instead
-    .no_op_note = `doc(spotlight)` is now a no-op
-
-passes_doc_test_unknown_include =
-    unknown `doc` attribute `{$path}`
-    .suggestion = use `doc = include_str!` instead
-
-passes_doc_invalid =
-    invalid `doc` attribute
-
-passes_pass_by_value =
-    `pass_by_value` attribute should be applied to a struct, enum or type alias
-    .label = is not a struct, enum or type alias
-
-passes_allow_incoherent_impl =
-    `rustc_allow_incoherent_impl` attribute should be applied to impl items.
-    .label = the only currently supported targets are inherent methods
-
-passes_has_incoherent_inherent_impl =
-    `rustc_has_incoherent_inherent_impls` attribute should be applied to types or traits.
-    .label = only adts, extern types and traits are supported
-
-passes_both_ffi_const_and_pure =
-    `#[ffi_const]` function cannot be `#[ffi_pure]`
-
-passes_ffi_pure_invalid_target =
-    `#[ffi_pure]` may only be used on foreign functions
-
-passes_ffi_const_invalid_target =
-    `#[ffi_const]` may only be used on foreign functions
-
-passes_ffi_returns_twice_invalid_target =
-    `#[ffi_returns_twice]` may only be used on foreign functions
-
-passes_must_use_async =
-    `must_use` attribute on `async` functions applies to the anonymous `Future` returned by the function, not the value within
-    .label = this attribute does nothing, the `Future`s returned by async functions are already `must_use`
-
-passes_must_use_no_effect =
-    `#[must_use]` has no effect when applied to {$article} {$target}
-
-passes_must_not_suspend =
-    `must_not_suspend` attribute should be applied to a struct, enum, or trait
-    .label = is not a struct, enum, or trait
-
-passes_cold =
-    {passes_should_be_applied_to_fn}
-    .warn = {-passes_previously_accepted}
-    .label = {passes_should_be_applied_to_fn.label}
-
-passes_link =
-    attribute should be applied to an `extern` block with non-Rust ABI
-    .warn = {-passes_previously_accepted}
-    .label = not an `extern` block
-
-passes_link_name =
-    attribute should be applied to a foreign function or static
-    .warn = {-passes_previously_accepted}
-    .label = not a foreign function or static
-    .help = try `#[link(name = "{$value}")]` instead
-
-passes_no_link =
-    attribute should be applied to an `extern crate` item
-    .label = not an `extern crate` item
-
-passes_export_name =
-    attribute should be applied to a free function, impl method or static
-    .label = not a free function, impl method or static
-
-passes_rustc_layout_scalar_valid_range_not_struct =
-    attribute should be applied to a struct
-    .label = not a struct
-
-passes_rustc_layout_scalar_valid_range_arg =
-    expected exactly one integer literal argument
-
-passes_rustc_legacy_const_generics_only =
-    #[rustc_legacy_const_generics] functions must only have const generics
-    .label = non-const generic parameter
-
-passes_rustc_legacy_const_generics_index =
-    #[rustc_legacy_const_generics] must have one index for each generic parameter
-    .label = generic parameters
-
-passes_rustc_legacy_const_generics_index_exceed =
-    index exceeds number of arguments
-    .label = there {$arg_count ->
-        [one] is
-        *[other] are
-    } only {$arg_count} {$arg_count ->
-        [one] argument
-        *[other] arguments
-    }
-
-passes_rustc_legacy_const_generics_index_negative =
-    arguments should be non-negative integers
-
-passes_rustc_dirty_clean =
-    attribute requires -Z query-dep-graph to be enabled
-
-passes_link_section =
-    attribute should be applied to a function or static
-    .warn = {-passes_previously_accepted}
-    .label = not a function or static
-
-passes_no_mangle_foreign =
-    `#[no_mangle]` has no effect on a foreign {$foreign_item_kind}
-    .warn = {-passes_previously_accepted}
-    .label = foreign {$foreign_item_kind}
-    .note = symbol names in extern blocks are not mangled
-    .suggestion = remove this attribute
-
-passes_no_mangle =
-    attribute should be applied to a free function, impl method or static
-    .warn = {-passes_previously_accepted}
-    .label = not a free function, impl method or static
-
-passes_repr_ident =
-    meta item in `repr` must be an identifier
-
-passes_repr_conflicting =
-    conflicting representation hints
-
-passes_used_static =
-    attribute must be applied to a `static` variable
-
-passes_used_compiler_linker =
-    `used(compiler)` and `used(linker)` can't be used together
-
-passes_allow_internal_unstable =
-    attribute should be applied to a macro
-    .label = not a macro
-
-passes_debug_visualizer_placement =
-    attribute should be applied to a module
-
-passes_debug_visualizer_invalid =
-    invalid argument
-    .note_1 = expected: `natvis_file = "..."`
-    .note_2 = OR
-    .note_3 = expected: `gdb_script_file = "..."`
-
-passes_debug_visualizer_unreadable =
-    couldn't read {$file}: {$error}
-
-passes_rustc_allow_const_fn_unstable =
-    attribute should be applied to `const fn`
-    .label = not a `const fn`
-
-passes_rustc_std_internal_symbol =
-    attribute should be applied to functions or statics
-    .label = not a function or static
-
-passes_const_trait =
-    attribute should be applied to a trait
-
-passes_stability_promotable =
-    attribute cannot be applied to an expression
-
-passes_deprecated =
-    attribute is ignored here
-
-passes_macro_use =
-    `#[{$name}]` only has an effect on `extern crate` and modules
-
-passes_macro_export =
-    `#[macro_export]` only has an effect on macro definitions
-
-passes_plugin_registrar =
-    `#[plugin_registrar]` only has an effect on functions
-
-passes_unused_empty_lints_note =
-    attribute `{$name}` with an empty list has no effect
-
-passes_unused_no_lints_note =
-    attribute `{$name}` without any lints has no effect
-
-passes_unused_default_method_body_const_note =
-    `default_method_body_is_const` has been replaced with `#[const_trait]` on traits
-
-passes_unused =
-    unused attribute
-    .suggestion = remove this attribute
-
-passes_non_exported_macro_invalid_attrs =
-    attribute should be applied to function or closure
-    .label = not a function or closure
-
-passes_unused_duplicate =
-    unused attribute
-    .suggestion = remove this attribute
-    .note = attribute also specified here
-    .warn = {-passes_previously_accepted}
-
-passes_unused_multiple =
-    multiple `{$name}` attributes
-    .suggestion = remove this attribute
-    .note = attribute also specified here
-
-passes_rustc_lint_opt_ty =
-    `#[rustc_lint_opt_ty]` should be applied to a struct
-    .label = not a struct
-
-passes_rustc_lint_opt_deny_field_access =
-    `#[rustc_lint_opt_deny_field_access]` should be applied to a field
-    .label = not a field
-
-passes_link_ordinal =
-    attribute should be applied to a foreign function or static
-    .label = not a foreign function or static
-
-passes_collapse_debuginfo =
-    `collapse_debuginfo` attribute should be applied to macro definitions
-    .label = not a macro definition
-
-passes_deprecated_annotation_has_no_effect =
-    this `#[deprecated]` annotation has no effect
-    .suggestion = remove the unnecessary deprecation attribute
-
-passes_unknown_external_lang_item =
-    unknown external lang item: `{$lang_item}`
-
-passes_missing_panic_handler =
-    `#[panic_handler]` function required, but not found
-
-passes_missing_lang_item =
-    language item required, but not found: `{$name}`
-    .note = this can occur when a binary crate with `#![no_std]` is compiled for a target where `{$name}` is defined in the standard library
-    .help = you may be able to compile for a target that doesn't need `{$name}`, specify a target with `--target` or in `.cargo/config`
-
-passes_lang_item_on_incorrect_target =
-    `{$name}` language item must be applied to a {$expected_target}
-    .label = attribute should be applied to a {$expected_target}, not a {$actual_target}
-
-passes_unknown_lang_item =
-    definition of an unknown language item: `{$name}`
-    .label = definition of unknown language item `{$name}`
-
-passes_invalid_attr_at_crate_level =
-    `{$name}` attribute cannot be used at crate level
-    .suggestion = perhaps you meant to use an outer attribute
-
-passes_duplicate_diagnostic_item =
-    duplicate diagnostic item found: `{$name}`.
-
-passes_duplicate_diagnostic_item_in_crate =
-    duplicate diagnostic item in crate `{$crate_name}`: `{$name}`.
-
-passes_diagnostic_item_first_defined =
-    the diagnostic item is first defined here
-    .note = the diagnostic item is first defined in crate `{$orig_crate_name}`.
-
-passes_abi =
-    abi: {$abi}
-
-passes_align =
-    align: {$align}
-
-passes_size =
-    size: {$size}
-
-passes_homogeneous_aggregate =
-    homogeneous_aggregate: {$homogeneous_aggregate}
-
-passes_layout_of =
-    layout_of({$normalized_ty}) = {$ty_layout}
-
-passes_unrecognized_field =
-    unrecognized field name `{$name}`
-
-passes_layout =
-    layout error: {$layout_error}
-
-passes_feature_stable_twice =
-    feature `{$feature}` is declared stable since {$since}, but was previously declared stable since {$prev_since}
-
-passes_feature_previously_declared =
-    feature `{$feature}` is declared {$declared}, but was previously declared {$prev_declared}
-
-passes_expr_not_allowed_in_context =
-    {$expr} is not allowed in a `{$context}`
-
-passes_const_impl_const_trait =
-    const `impl`s must be for traits marked with `#[const_trait]`
-    .note = this trait must be annotated with `#[const_trait]`
-
-passes_break_non_loop =
-    `break` with value from a `{$kind}` loop
-    .label = can only break with a value inside `loop` or breakable block
-    .label2 = you can't `break` with a value in a `{$kind}` loop
-    .suggestion = use `break` on its own without a value inside this `{$kind}` loop
-    .break_expr_suggestion = alternatively, you might have meant to use the available loop label
-
-passes_continue_labeled_block =
-    `continue` pointing to a labeled block
-    .label = labeled blocks cannot be `continue`'d
-    .block_label = labeled block the `continue` points to
-
-passes_break_inside_closure =
-    `{$name}` inside of a closure
-    .label = cannot `{$name}` inside of a closure
-    .closure_label = enclosing closure
-
-passes_break_inside_async_block =
-    `{$name}` inside of an `async` block
-    .label = cannot `{$name}` inside of an `async` block
-    .async_block_label = enclosing `async` block
-
-passes_outside_loop =
-    `{$name}` outside of a loop{$is_break ->
-        [true] {" or labeled block"}
-        *[false] {""}
-    }
-    .label = cannot `{$name}` outside of a loop{$is_break ->
-        [true] {" or labeled block"}
-        *[false] {""}
-    }
-
-passes_unlabeled_in_labeled_block =
-    unlabeled `{$cf_type}` inside of a labeled block
-    .label = `{$cf_type}` statements that would diverge to or through a labeled block need to bear a label
-
-passes_unlabeled_cf_in_while_condition =
-    `break` or `continue` with no label in the condition of a `while` loop
-    .label = unlabeled `{$cf_type}` in the condition of a `while` loop
-
-passes_cannot_inline_naked_function =
-    naked functions cannot be inlined
-
-passes_undefined_naked_function_abi =
-    Rust ABI is unsupported in naked functions
-
-passes_no_patterns =
-    patterns not allowed in naked function parameters
-
-passes_params_not_allowed =
-    referencing function parameters is not allowed in naked functions
-    .help = follow the calling convention in asm block to use parameters
-
-passes_naked_functions_asm_block =
-    naked functions must contain a single asm block
-    .label_multiple_asm = multiple asm blocks are unsupported in naked functions
-    .label_non_asm = non-asm is unsupported in naked functions
-
-passes_naked_functions_operands =
-    only `const` and `sym` operands are supported in naked functions
-
-passes_naked_functions_asm_options =
-    asm options unsupported in naked functions: {$unsupported_options}
-
-passes_naked_functions_must_use_noreturn =
-    asm in naked functions must use `noreturn` option
-    .suggestion = consider specifying that the asm block is responsible for returning from the function
-
-passes_attr_only_on_main =
-    `{$attr}` attribute can only be used on `fn main()`
-
-passes_attr_only_on_root_main =
-    `{$attr}` attribute can only be used on root `fn main()`
-
-passes_attr_only_in_functions =
-    `{$attr}` attribute can only be used on functions
-
-passes_multiple_rustc_main =
-    multiple functions with a `#[rustc_main]` attribute
-    .first = first `#[rustc_main]` function
-    .additional = additional `#[rustc_main]` function
-
-passes_multiple_start_functions =
-    multiple `start` functions
-    .label = multiple `start` functions
-    .previous = previous `#[start]` function here
-
-passes_extern_main =
-    the `main` function cannot be declared in an `extern` block
-
-passes_unix_sigpipe_values =
-    valid values for `#[unix_sigpipe = "..."]` are `inherit`, `sig_ign`, or `sig_dfl`
-
-passes_no_main_function =
-    `main` function not found in crate `{$crate_name}`
-    .here_is_main = here is a function named `main`
-    .one_or_more_possible_main = you have one or more functions named `main` not defined at the crate level
-    .consider_moving_main = consider moving the `main` function definitions
-    .main_must_be_defined_at_crate = the main function must be defined at the crate level{$has_filename ->
-        [true] {" "}(in `{$filename}`)
-        *[false] {""}
-    }
-    .consider_adding_main_to_file = consider adding a `main` function to `{$filename}`
-    .consider_adding_main_at_crate = consider adding a `main` function at the crate level
-    .teach_note = If you don't know the basics of Rust, you can go look to the Rust Book to get started: https://doc.rust-lang.org/book/
-    .non_function_main = non-function item at `crate::main` is found
-
-passes_duplicate_lang_item =
-    found duplicate lang item `{$lang_item_name}`
-    .first_defined_span = the lang item is first defined here
-    .first_defined_crate_depends = the lang item is first defined in crate `{$orig_crate_name}` (which `{$orig_dependency_of}` depends on)
-    .first_defined_crate = the lang item is first defined in crate `{$orig_crate_name}`.
-    .first_definition_local = first definition in the local crate (`{$orig_crate_name}`)
-    .second_definition_local = second definition in the local crate (`{$crate_name}`)
-    .first_definition_path = first definition in `{$orig_crate_name}` loaded from {$orig_path}
-    .second_definition_path = second definition in `{$crate_name}` loaded from {$path}
-
-passes_duplicate_lang_item_crate =
-    duplicate lang item in crate `{$crate_name}`: `{$lang_item_name}`.
-    .first_defined_span = the lang item is first defined here
-    .first_defined_crate_depends = the lang item is first defined in crate `{$orig_crate_name}` (which `{$orig_dependency_of}` depends on)
-    .first_defined_crate = the lang item is first defined in crate `{$orig_crate_name}`.
-    .first_definition_local = first definition in the local crate (`{$orig_crate_name}`)
-    .second_definition_local = second definition in the local crate (`{$crate_name}`)
-    .first_definition_path = first definition in `{$orig_crate_name}` loaded from {$orig_path}
-    .second_definition_path = second definition in `{$crate_name}` loaded from {$path}
-
-passes_duplicate_lang_item_crate_depends =
-    duplicate lang item in crate `{$crate_name}` (which `{$dependency_of}` depends on): `{$lang_item_name}`.
-    .first_defined_span = the lang item is first defined here
-    .first_defined_crate_depends = the lang item is first defined in crate `{$orig_crate_name}` (which `{$orig_dependency_of}` depends on)
-    .first_defined_crate = the lang item is first defined in crate `{$orig_crate_name}`.
-    .first_definition_local = first definition in the local crate (`{$orig_crate_name}`)
-    .second_definition_local = second definition in the local crate (`{$crate_name}`)
-    .first_definition_path = first definition in `{$orig_crate_name}` loaded from {$orig_path}
-    .second_definition_path = second definition in `{$crate_name}` loaded from {$path}
-
-passes_incorrect_target =
-    `{$name}` language item must be applied to a {$kind} with {$at_least ->
-        [true] at least {$num}
-        *[false] {$num}
-    } generic {$num ->
-        [one] argument
-        *[other] arguments
-    }
-    .label = this {$kind} has {$actual_num} generic {$actual_num ->
-        [one] argument
-        *[other] arguments
-    }
-
-passes_useless_assignment =
-    useless assignment of {$is_field_assign ->
-        [true] field
-        *[false] variable
-    } of type `{$ty}` to itself
-
-passes_only_has_effect_on =
-    `#[{$attr_name}]` only has an effect on {$target_name ->
-        [function] functions
-        [module] modules
-        [implementation_block] implementation blocks
-        *[unspecified] (unspecified--this is a compiler bug)
-    }
-
-passes_object_lifetime_err =
-    {$repr}
-
-passes_unrecognized_repr_hint =
-    unrecognized representation hint
-    .help = valid reprs are `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
-
-passes_attr_application_enum =
-    attribute should be applied to an enum
-    .label = not an enum
-
-passes_attr_application_struct =
-    attribute should be applied to a struct
-    .label = not a struct
-
-passes_attr_application_struct_union =
-    attribute should be applied to a struct or union
-    .label = not a struct or union
-
-passes_attr_application_struct_enum_union =
-    attribute should be applied to a struct, enum, or union
-    .label = not a struct, enum, or union
-
-passes_attr_application_struct_enum_function_union =
-    attribute should be applied to a struct, enum, function, or union
-    .label = not a struct, enum, function, or union
-
-passes_transparent_incompatible =
-    transparent {$target} cannot have other repr hints
-
-passes_deprecated_attribute =
-    deprecated attribute must be paired with either stable or unstable attribute
-
-passes_useless_stability =
-    this stability annotation is useless
-    .label = useless stability annotation
-    .item = the stability attribute annotates this item
-
-passes_invalid_stability =
-    invalid stability version found
-    .label = invalid stability version
-    .item = the stability attribute annotates this item
-
-passes_cannot_stabilize_deprecated =
-    an API can't be stabilized after it is deprecated
-    .label = invalid version
-    .item = the stability attribute annotates this item
-
-passes_invalid_deprecation_version =
-    invalid deprecation version found
-    .label = invalid deprecation version
-    .item = the stability attribute annotates this item
-
-passes_missing_stability_attr =
-    {$descr} has missing stability attribute
-
-passes_missing_const_stab_attr =
-    {$descr} has missing const stability attribute
-
-passes_trait_impl_const_stable =
-    trait implementations cannot be const stable yet
-    .note = see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
-
-passes_feature_only_on_nightly =
-    `#![feature]` may not be used on the {$release_channel} release channel
-
-passes_unknown_feature =
-    unknown feature `{$feature}`
-
-passes_implied_feature_not_exist =
-    feature `{$implied_by}` implying `{$feature}` does not exist
-
-passes_duplicate_feature_err =
-    the feature `{$feature}` has already been declared
-
-passes_missing_const_err =
-    attributes `#[rustc_const_unstable]` and `#[rustc_const_stable]` require the function or method to be `const`
-    .help = make the function or method const
-    .label = attribute specified here
-
-passes_dead_codes =
-    { $multiple ->
-      *[true] multiple {$descr}s are
-       [false] { $num ->
-         [one] {$descr} {$name_list} is
-        *[other] {$descr}s {$name_list} are
-       }
-    } never {$participle}
-
-passes_change_fields_to_be_of_unit_type =
-    consider changing the { $num ->
-      [one] field
-     *[other] fields
-    } to be of unit type to suppress this warning while preserving the field numbering, or remove the { $num ->
-      [one] field
-     *[other] fields
-    }
-
-passes_parent_info =
-    {$num ->
-      [one] {$descr}
-     *[other] {$descr}s
-    } in this {$parent_descr}
-
-passes_ignored_derived_impls =
-    `{$name}` has {$trait_list_len ->
-      [one] a derived impl
-     *[other] derived impls
-    } for the {$trait_list_len ->
-      [one] trait {$trait_list}, but this is
-     *[other] traits {$trait_list}, but these are
-    } intentionally ignored during dead code analysis
-
-passes_proc_macro_typeerror = mismatched {$kind} signature
-    .label = found {$found}, expected type `proc_macro::TokenStream`
-    .note = {$kind}s must have a signature of `{$expected_signature}`
-
-passes_proc_macro_diff_arg_count = mismatched {$kind} signature
-    .label = found unexpected {$count ->
-      [one] argument
-     *[other] arguments
-    }
-    .note = {$kind}s must have a signature of `{$expected_signature}`
-
-passes_proc_macro_missing_args = mismatched {$kind} signature
-    .label = {$kind} must have {$expected_input_count ->
-      [one] one argument
-     *[other] two arguments
-    } of type `proc_macro::TokenStream`
-
-passes_proc_macro_invalid_abi = proc macro functions may not be `extern "{$abi}"`
-
-passes_proc_macro_unsafe = proc macro functions may not be `unsafe`
-
-passes_skipping_const_checks = skipping const checks
diff --git a/compiler/rustc_error_messages/locales/en-US/plugin_impl.ftl b/compiler/rustc_error_messages/locales/en-US/plugin_impl.ftl
deleted file mode 100644
index 8db32a42c1d..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/plugin_impl.ftl
+++ /dev/null
@@ -1,4 +0,0 @@
-plugin_impl_load_plugin_error = {$msg}
-
-plugin_impl_malformed_plugin_attribute = malformed `plugin` attribute
-    .label = malformed attribute
diff --git a/compiler/rustc_error_messages/locales/en-US/privacy.ftl b/compiler/rustc_error_messages/locales/en-US/privacy.ftl
deleted file mode 100644
index a26d1b2b381..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/privacy.ftl
+++ /dev/null
@@ -1,23 +0,0 @@
-privacy_field_is_private = field `{$field_name}` of {$variant_descr} `{$def_path_str}` is private
-privacy_field_is_private_is_update_syntax_label = field `{$field_name}` is private
-privacy_field_is_private_label = private field
-
-privacy_item_is_private = {$kind} `{$descr}` is private
-    .label = private {$kind}
-privacy_unnamed_item_is_private = {$kind} is private
-    .label = private {$kind}
-
-privacy_in_public_interface = {$vis_descr} {$kind} `{$descr}` in public interface
-    .label = can't leak {$vis_descr} {$kind}
-    .visibility_label = `{$descr}` declared as {$vis_descr}
-
-privacy_report_effective_visibility = {$descr}
-
-privacy_from_private_dep_in_public_interface =
-    {$kind} `{$descr}` from private dependency '{$krate}' in public interface
-
-privacy_private_in_public_lint =
-    {$vis_descr} {$kind} `{$descr}` in public interface (error {$kind ->
-        [trait] E0445
-        *[other] E0446
-    })
diff --git a/compiler/rustc_error_messages/locales/en-US/query_system.ftl b/compiler/rustc_error_messages/locales/en-US/query_system.ftl
deleted file mode 100644
index 870e824039c..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/query_system.ftl
+++ /dev/null
@@ -1,30 +0,0 @@
-query_system_reentrant = internal compiler error: re-entrant incremental verify failure, suppressing message
-
-query_system_increment_compilation = internal compiler error: encountered incremental compilation error with {$dep_node}
-    .help = This is a known issue with the compiler. Run {$run_cmd} to allow your project to compile
-
-query_system_increment_compilation_note1 = Please follow the instructions below to create a bug report with the provided information
-query_system_increment_compilation_note2 = See <https://github.com/rust-lang/rust/issues/84970> for more information
-
-query_system_cycle = cycle detected when {$stack_bottom}
-
-query_system_cycle_usage = cycle used when {$usage}
-
-query_system_cycle_stack_single = ...which immediately requires {$stack_bottom} again
-
-query_system_cycle_stack_middle = ...which requires {$desc}...
-
-query_system_cycle_stack_multiple = ...which again requires {$stack_bottom}, completing the cycle
-
-query_system_cycle_recursive_ty_alias = type aliases cannot be recursive
-query_system_cycle_recursive_ty_alias_help1 = consider using a struct, enum, or union instead to break the cycle
-query_system_cycle_recursive_ty_alias_help2 = see <https://doc.rust-lang.org/reference/types.html#recursive-types> for more information
-
-query_system_cycle_recursive_trait_alias = trait aliases cannot be recursive
-
-query_system_cycle_which_requires = ...which requires {$desc}...
-
-query_system_query_overflow = queries overflow the depth limit!
-    .help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
-
-query_system_layout_of_depth = query depth increased by {$depth} when {$desc}
diff --git a/compiler/rustc_error_messages/locales/en-US/resolve.ftl b/compiler/rustc_error_messages/locales/en-US/resolve.ftl
deleted file mode 100644
index 817bb83ed78..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/resolve.ftl
+++ /dev/null
@@ -1,211 +0,0 @@
-resolve_parent_module_reset_for_binding =
-    parent module is reset for binding
-
-resolve_ampersand_used_without_explicit_lifetime_name =
-    `&` without an explicit lifetime name cannot be used here
-    .note = explicit lifetime name needed here
-
-resolve_underscore_lifetime_name_cannot_be_used_here =
-    `'_` cannot be used here
-    .note = `'_` is a reserved lifetime name
-
-resolve_crate_may_not_be_imported =
-    `$crate` may not be imported
-
-resolve_crate_root_imports_must_be_named_explicitly =
-    crate root imports need to be explicitly named: `use crate as name;`
-
-resolve_generic_params_from_outer_function =
-    can't use generic parameters from outer function
-    .label = use of generic parameter from outer function
-    .suggestion = try using a local generic parameter instead
-
-resolve_self_type_implicitly_declared_by_impl =
-    `Self` type implicitly declared here, by this `impl`
-
-resolve_cannot_use_self_type_here =
-    can't use `Self` here
-
-resolve_use_a_type_here_instead =
-    use a type here instead
-
-resolve_type_param_from_outer_fn =
-    type parameter from outer function
-
-resolve_const_param_from_outer_fn =
-    const parameter from outer function
-
-resolve_try_using_local_generic_parameter =
-    try using a local generic parameter instead
-
-resolve_try_adding_local_generic_param_on_method =
-    try adding a local generic parameter in this method instead
-
-resolve_help_try_using_local_generic_param =
-    try using a local generic paramter instead
-
-resolve_name_is_already_used_as_generic_parameter =
-    the name `{$name}` is already used for a generic parameter in this item's generic parameters
-    .label = already used
-    .first_use_of_name = first use of `{$name}`
-
-resolve_method_not_member_of_trait =
-    method `{$method}` is not a member of trait `{$trait_}`
-    .label = not a member of trait `{$trait_}`
-
-resolve_associated_fn_with_similar_name_exists =
-    there is an associated function with a similar name
-
-resolve_type_not_member_of_trait =
-    type `{$type_}` is not a member of trait `{$trait_}`
-    .label = not a member of trait `{$trait_}`
-
-resolve_associated_type_with_similar_name_exists =
-    there is an associated type with a similar name
-
-resolve_const_not_member_of_trait =
-    const `{$const_}` is not a member of trait `{$trait_}`
-    .label = not a member of trait `{$trait_}`
-
-resolve_associated_const_with_similar_name_exists =
-    there is an associated constant with a similar name
-
-resolve_variable_bound_with_different_mode =
-    variable `{$variable_name}` is bound inconsistently across alternatives separated by `|`
-    .label = bound in different ways
-    .first_binding_span = first binding
-
-resolve_ident_bound_more_than_once_in_parameter_list =
-    identifier `{$identifier}` is bound more than once in this parameter list
-    .label = used as parameter more than once
-
-resolve_ident_bound_more_than_once_in_same_pattern =
-    identifier `{$identifier}` is bound more than once in the same pattern
-    .label = used in a pattern more than once
-
-resolve_undeclared_label =
-    use of undeclared label `{$name}`
-    .label = undeclared label `{$name}`
-
-resolve_label_with_similar_name_reachable =
-    a label with a similar name is reachable
-
-resolve_try_using_similarly_named_label =
-    try using similarly named label
-
-resolve_unreachable_label_with_similar_name_exists =
-    a label with a similar name exists but is unreachable
-
-resolve_self_import_can_only_appear_once_in_the_list =
-    `self` import can only appear once in an import list
-    .label = can only appear once in an import list
-
-resolve_self_import_only_in_import_list_with_non_empty_prefix =
-    `self` import can only appear in an import list with a non-empty prefix
-    .label = can only appear in an import list with a non-empty prefix
-
-resolve_cannot_capture_dynamic_environment_in_fn_item =
-    can't capture dynamic environment in a fn item
-    .help = use the `|| {"{"} ... {"}"}` closure form instead
-
-resolve_attempt_to_use_non_constant_value_in_constant =
-    attempt to use a non-constant value in a constant
-
-resolve_attempt_to_use_non_constant_value_in_constant_with_suggestion =
-    consider using `{$suggestion}` instead of `{$current}`
-
-resolve_attempt_to_use_non_constant_value_in_constant_label_with_suggestion =
-    non-constant value
-
-resolve_attempt_to_use_non_constant_value_in_constant_without_suggestion =
-    this would need to be a `{$suggestion}`
-
-resolve_self_imports_only_allowed_within =
-    `self` imports are only allowed within a {"{"} {"}"} list
-
-resolve_self_imports_only_allowed_within_suggestion =
-    consider importing the module directly
-
-resolve_self_imports_only_allowed_within_multipart_suggestion =
-    alternatively, use the multi-path `use` syntax to import `self`
-
-resolve_binding_shadows_something_unacceptable =
-    {$shadowing_binding}s cannot shadow {$shadowed_binding}s
-    .label = cannot be named the same as {$article} {$shadowed_binding}
-    .label_shadowed_binding = the {$shadowed_binding} `{$name}` is {$participle} here
-
-resolve_binding_shadows_something_unacceptable_suggestion =
-    try specify the pattern arguments
-
-resolve_forward_declared_generic_param =
-    generic parameters with a default cannot use forward declared identifiers
-    .label = defaulted generic parameters cannot be forward declared
-
-resolve_param_in_ty_of_const_param =
-    the type of const parameters must not depend on other generic parameters
-    .label = the type must not depend on the parameter `{$name}`
-
-resolve_self_in_generic_param_default =
-    generic parameters cannot use `Self` in their defaults
-    .label = `Self` in generic parameter default
-
-resolve_param_in_non_trivial_anon_const =
-    generic parameters may not be used in const operations
-    .label = cannot perform const operation using `{$name}`
-
-resolve_param_in_non_trivial_anon_const_help =
-    use `#![feature(generic_const_exprs)]` to allow generic const expressions
-
-resolve_param_in_non_trivial_anon_const_sub_type =
-    type parameters may not be used in const expressions
-
-resolve_param_in_non_trivial_anon_const_sub_non_type =
-    const parameters may only be used as standalone arguments, i.e. `{$name}`
-
-resolve_unreachable_label =
-    use of unreachable label `{$name}`
-    .label = unreachable label `{$name}`
-    .label_definition_span = unreachable label defined here
-    .note = labels are unreachable through functions, closures, async blocks and modules
-
-resolve_unreachable_label_suggestion_use_similarly_named =
-    try using similarly named label
-
-resolve_unreachable_label_similar_name_reachable =
-    a label with a similar name is reachable
-
-resolve_unreachable_label_similar_name_unreachable =
-    a label with a similar name exists but is also unreachable
-
-resolve_trait_impl_mismatch =
-    item `{$name}` is an associated {$kind}, which doesn't match its trait `{$trait_path}`
-    .label = does not match trait
-    .label_trait_item = item in trait
-
-resolve_invalid_asm_sym =
-    invalid `sym` operand
-    .label = is a local variable
-    .help = `sym` operands must refer to either a function or a static
-
-resolve_trait_impl_duplicate =
-    duplicate definitions with name `{$name}`:
-    .label = duplicate definition
-    .old_span_label = previous definition here
-    .trait_item_span = item in trait
-
-resolve_relative_2018 =
-    relative paths are not supported in visibilities in 2018 edition or later
-    .suggestion = try
-
-resolve_ancestor_only =
-    visibilities can only be restricted to ancestor modules
-
-resolve_expected_found =
-    expected module, found {$res} `{$path_str}`
-    .label = not a module
-
-resolve_indeterminate =
-    cannot determine resolution for the visibility
-
-resolve_module_only =
-    visibility must resolve to a module
diff --git a/compiler/rustc_error_messages/locales/en-US/session.ftl b/compiler/rustc_error_messages/locales/en-US/session.ftl
deleted file mode 100644
index fe553edab42..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/session.ftl
+++ /dev/null
@@ -1,95 +0,0 @@
-session_incorrect_cgu_reuse_type =
-    CGU-reuse for `{$cgu_user_name}` is `{$actual_reuse}` but should be {$at_least ->
-    [one] {"at least "}
-    *[other] {""}
-    }`{$expected_reuse}`
-
-session_cgu_not_recorded =
-    CGU-reuse for `{$cgu_user_name}` is (mangled: `{$cgu_name}`) was not recorded`
-
-session_feature_gate_error = {$explain}
-
-session_feature_diagnostic_for_issue =
-    see issue #{$n} <https://github.com/rust-lang/rust/issues/{$n}> for more information
-
-session_feature_diagnostic_help =
-    add `#![feature({$feature})]` to the crate attributes to enable
-
-session_not_circumvent_feature = `-Zunleash-the-miri-inside-of-you` may not be used to circumvent feature gates, except when testing error paths in the CTFE engine
-
-session_profile_use_file_does_not_exist = file `{$path}` passed to `-C profile-use` does not exist.
-
-session_linker_plugin_lto_windows_not_supported = linker plugin based LTO is not supported together with `-C prefer-dynamic` when targeting Windows-like targets
-
-session_profile_sample_use_file_does_not_exist = file `{$path}` passed to `-C profile-sample-use` does not exist.
-
-session_target_requires_unwind_tables = target requires unwind tables, they cannot be disabled with `-C force-unwind-tables=no`
-
-session_instrumentation_not_supported = {$us} instrumentation is not supported for this target
-
-session_sanitizer_not_supported = {$us} sanitizer is not supported for this target
-
-session_sanitizers_not_supported = {$us} sanitizers are not supported for this target
-
-session_cannot_mix_and_match_sanitizers = `-Zsanitizer={$first}` is incompatible with `-Zsanitizer={$second}`
-
-session_cannot_enable_crt_static_linux = sanitizer is incompatible with statically linked libc, disable it using `-C target-feature=-crt-static`
-
-session_sanitizer_cfi_enabled = `-Zsanitizer=cfi` requires `-Clto`
-
-session_unstable_virtual_function_elimination = `-Zvirtual-function-elimination` requires `-Clto`
-
-session_unsupported_dwarf_version = requested DWARF version {$dwarf_version} is greater than 5
-
-session_target_stack_protector_not_supported = `-Z stack-protector={$stack_protector}` is not supported for target {$target_triple} and will be ignored
-
-session_branch_protection_requires_aarch64 = `-Zbranch-protection` is only supported on aarch64
-
-session_split_debuginfo_unstable_platform = `-Csplit-debuginfo={$debuginfo}` is unstable on this platform
-
-session_file_is_not_writeable = output file {$file} is not writeable -- check its permissions
-
-session_crate_name_does_not_match = `--crate-name` and `#[crate_name]` are required to match, but `{$s}` != `{$name}`
-
-session_crate_name_invalid = crate names cannot start with a `-`, but `{$s}` has a leading hyphen
-
-session_crate_name_empty = crate name must not be empty
-
-session_invalid_character_in_create_name = invalid character `{$character}` in crate name: `{$crate_name}`
-
-session_expr_parentheses_needed = parentheses are required to parse this as an expression
-
-session_skipping_const_checks = skipping const checks
-session_unleashed_feature_help_named = skipping check for `{$gate}` feature
-session_unleashed_feature_help_unnamed = skipping check that does not even have a feature gate
-
-session_hexadecimal_float_literal_not_supported = hexadecimal float literal is not supported
-session_octal_float_literal_not_supported = octal float literal is not supported
-session_binary_float_literal_not_supported = binary float literal is not supported
-session_not_supported = not supported
-
-session_invalid_literal_suffix = suffixes on {$kind} literals are invalid
-    .label = invalid suffix `{$suffix}`
-
-session_invalid_num_literal_base_prefix = invalid base prefix for number literal
-    .note = base prefixes (`0xff`, `0b1010`, `0o755`) are lowercase
-    .suggestion = try making the prefix lowercase
-
-session_invalid_num_literal_suffix = invalid suffix `{$suffix}` for number literal
-    .label = invalid suffix `{$suffix}`
-    .help = the suffix must be one of the numeric types (`u32`, `isize`, `f32`, etc.)
-
-session_invalid_float_literal_width = invalid width `{$width}` for float literal
-    .help = valid widths are 32 and 64
-
-session_invalid_float_literal_suffix = invalid suffix `{$suffix}` for float literal
-    .label = invalid suffix `{$suffix}`
-    .help = valid suffixes are `f32` and `f64`
-
-session_int_literal_too_large = integer literal is too large
-    .note = value exceeds limit of `{$limit}`
-
-session_invalid_int_literal_width = invalid width `{$width}` for integer literal
-    .help = valid widths are 8, 16, 32, 64 and 128
-
-session_optimization_fuel_exhausted = optimization-fuel-exhausted: {$msg}
diff --git a/compiler/rustc_error_messages/locales/en-US/symbol_mangling.ftl b/compiler/rustc_error_messages/locales/en-US/symbol_mangling.ftl
deleted file mode 100644
index b7d48280f46..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/symbol_mangling.ftl
+++ /dev/null
@@ -1 +0,0 @@
-symbol_mangling_test_output = {$kind}({$content})
diff --git a/compiler/rustc_error_messages/locales/en-US/trait_selection.ftl b/compiler/rustc_error_messages/locales/en-US/trait_selection.ftl
deleted file mode 100644
index 14eb4a5502d..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/trait_selection.ftl
+++ /dev/null
@@ -1,22 +0,0 @@
-trait_selection_dump_vtable_entries = vtable entries for `{$trait_ref}`: {$entries}
-
-trait_selection_unable_to_construct_constant_value = unable to construct a constant value for the unevaluated constant {$unevaluated}
-
-trait_selection_empty_on_clause_in_rustc_on_unimplemented = empty `on`-clause in `#[rustc_on_unimplemented]`
-    .label = empty on-clause here
-
-trait_selection_invalid_on_clause_in_rustc_on_unimplemented = invalid `on`-clause in `#[rustc_on_unimplemented]`
-    .label = invalid on-clause here
-
-trait_selection_no_value_in_rustc_on_unimplemented = this attribute must have a valid value
-    .label = expected value here
-    .note = eg `#[rustc_on_unimplemented(message="foo")]`
-
-trait_selection_negative_positive_conflict = found both positive and negative implementation of trait `{$trait_desc}`{$self_desc ->
-        [none] {""}
-       *[default] {" "}for type `{$self_desc}`
-    }:
-    .negative_implementation_here = negative implementation here
-    .negative_implementation_in_crate = negative implementation in crate `{$negative_impl_cname}`
-    .positive_implementation_here = positive implementation here
-    .positive_implementation_in_crate = positive implementation in crate `{$positive_impl_cname}`
diff --git a/compiler/rustc_error_messages/locales/en-US/ty_utils.ftl b/compiler/rustc_error_messages/locales/en-US/ty_utils.ftl
deleted file mode 100644
index abe65a0e3fe..00000000000
--- a/compiler/rustc_error_messages/locales/en-US/ty_utils.ftl
+++ /dev/null
@@ -1,47 +0,0 @@
-ty_utils_needs_drop_overflow = overflow while checking whether `{$query_ty}` requires drop
-
-ty_utils_generic_constant_too_complex = overly complex generic constant
-    .help = consider moving this anonymous constant into a `const` function
-    .maybe_supported = this operation may be supported in the future
-
-ty_utils_borrow_not_supported = borrowing is not supported in generic constants
-
-ty_utils_address_and_deref_not_supported = dereferencing or taking the address is not supported in generic constants
-
-ty_utils_array_not_supported = array construction is not supported in generic constants
-
-ty_utils_block_not_supported = blocks are not supported in generic constants
-
-ty_utils_never_to_any_not_supported = converting nevers to any is not supported in generic constants
-
-ty_utils_tuple_not_supported = tuple construction is not supported in generic constants
-
-ty_utils_index_not_supported = indexing is not supported in generic constants
-
-ty_utils_field_not_supported = field access is not supported in generic constants
-
-ty_utils_const_block_not_supported = const blocks are not supported in generic constants
-
-ty_utils_adt_not_supported = struct/enum construction is not supported in generic constants
-
-ty_utils_pointer_not_supported = pointer casts are not allowed in generic constants
-
-ty_utils_yield_not_supported = generator control flow is not allowed in generic constants
-
-ty_utils_loop_not_supported = loops and loop control flow are not supported in generic constants
-
-ty_utils_box_not_supported = allocations are not allowed in generic constants
-
-ty_utils_binary_not_supported = unsupported binary operation in generic constants
-
-ty_utils_logical_op_not_supported = unsupported operation in generic constants, short-circuiting operations would imply control flow
-
-ty_utils_assign_not_supported = assignment is not supported in generic constants
-
-ty_utils_closure_and_return_not_supported = closures and function keywords are not supported in generic constants
-
-ty_utils_control_flow_not_supported = control flow is not supported in generic constants
-
-ty_utils_inline_asm_not_supported = assembly is not supported in generic constants
-
-ty_utils_operation_not_supported = unsupported operation in generic constants
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
index 579466ed366..13952f8456e 100644
--- a/compiler/rustc_error_messages/src/lib.rs
+++ b/compiler/rustc_error_messages/src/lib.rs
@@ -34,47 +34,7 @@ use intl_memoizer::IntlLangMemoizer;
 pub use fluent_bundle::{self, types::FluentType, FluentArgs, FluentError, FluentValue};
 pub use unic_langid::{langid, LanguageIdentifier};
 
-// Generates `DEFAULT_LOCALE_RESOURCES` static and `fluent_generated` module.
-fluent_messages! {
-    // tidy-alphabetical-start
-    ast_lowering => "../locales/en-US/ast_lowering.ftl",
-    ast_passes => "../locales/en-US/ast_passes.ftl",
-    attr => "../locales/en-US/attr.ftl",
-    borrowck => "../locales/en-US/borrowck.ftl",
-    builtin_macros => "../locales/en-US/builtin_macros.ftl",
-    codegen_gcc => "../locales/en-US/codegen_gcc.ftl",
-    codegen_llvm => "../locales/en-US/codegen_llvm.ftl",
-    codegen_ssa => "../locales/en-US/codegen_ssa.ftl",
-    compiletest => "../locales/en-US/compiletest.ftl",
-    const_eval => "../locales/en-US/const_eval.ftl",
-    driver => "../locales/en-US/driver.ftl",
-    errors => "../locales/en-US/errors.ftl",
-    expand => "../locales/en-US/expand.ftl",
-    hir_analysis => "../locales/en-US/hir_analysis.ftl",
-    hir_typeck => "../locales/en-US/hir_typeck.ftl",
-    incremental => "../locales/en-US/incremental.ftl",
-    infer => "../locales/en-US/infer.ftl",
-    interface => "../locales/en-US/interface.ftl",
-    lint => "../locales/en-US/lint.ftl",
-    metadata => "../locales/en-US/metadata.ftl",
-    middle => "../locales/en-US/middle.ftl",
-    mir_build => "../locales/en-US/mir_build.ftl",
-    mir_dataflow => "../locales/en-US/mir_dataflow.ftl",
-    monomorphize => "../locales/en-US/monomorphize.ftl",
-    parse => "../locales/en-US/parse.ftl",
-    passes => "../locales/en-US/passes.ftl",
-    plugin_impl => "../locales/en-US/plugin_impl.ftl",
-    privacy => "../locales/en-US/privacy.ftl",
-    query_system => "../locales/en-US/query_system.ftl",
-    resolve => "../locales/en-US/resolve.ftl",
-    session => "../locales/en-US/session.ftl",
-    symbol_mangling => "../locales/en-US/symbol_mangling.ftl",
-    trait_selection => "../locales/en-US/trait_selection.ftl",
-    ty_utils => "../locales/en-US/ty_utils.ftl",
-    // tidy-alphabetical-end
-}
-
-pub use fluent_generated::{self as fluent, DEFAULT_LOCALE_RESOURCES};
+fluent_messages! { "../locales/en-US.ftl" }
 
 pub type FluentBundle = fluent_bundle::bundle::FluentBundle<FluentResource, IntlLangMemoizer>;
 
diff --git a/compiler/rustc_errors/locales/en-US.ftl b/compiler/rustc_errors/locales/en-US.ftl
new file mode 100644
index 00000000000..dde1d6c0a81
--- /dev/null
+++ b/compiler/rustc_errors/locales/en-US.ftl
@@ -0,0 +1,19 @@
+errors_target_invalid_address_space =
+    invalid address space `{$addr_space}` for `{$cause}` in "data-layout": {$err}
+
+errors_target_invalid_bits =
+    invalid {$kind} `{$bit}` for `{$cause}` in "data-layout": {$err}
+
+errors_target_missing_alignment =
+    missing alignment for `{$cause}` in "data-layout"
+
+errors_target_invalid_alignment =
+    invalid alignment for `{$cause}` in "data-layout": {$err}
+
+errors_target_inconsistent_architecture =
+    inconsistent target specification: "data-layout" claims architecture is {$dl}-endian, while "target-endian" is `{$target}`
+
+errors_target_inconsistent_pointer_width =
+    inconsistent target specification: "data-layout" claims pointers are {$pointer_size}-bit, while "target-pointer-width" is `{$target}`
+
+errors_target_invalid_bits_size = {$err}
diff --git a/compiler/rustc_errors/src/diagnostic_impls.rs b/compiler/rustc_errors/src/diagnostic_impls.rs
index 5ada85d04b0..d4ddd0c53bf 100644
--- a/compiler/rustc_errors/src/diagnostic_impls.rs
+++ b/compiler/rustc_errors/src/diagnostic_impls.rs
@@ -1,6 +1,5 @@
-use crate::{
-    fluent, DiagnosticArgValue, DiagnosticBuilder, Handler, IntoDiagnostic, IntoDiagnosticArg,
-};
+use crate::fluent_generated as fluent;
+use crate::{DiagnosticArgValue, DiagnosticBuilder, Handler, IntoDiagnostic, IntoDiagnosticArg};
 use rustc_ast as ast;
 use rustc_ast_pretty::pprust;
 use rustc_hir as hir;
diff --git a/compiler/rustc_errors/src/json/tests.rs b/compiler/rustc_errors/src/json/tests.rs
index f161532d3b7..bbfad26c6f0 100644
--- a/compiler/rustc_errors/src/json/tests.rs
+++ b/compiler/rustc_errors/src/json/tests.rs
@@ -42,11 +42,11 @@ impl<T: Write> Write for Shared<T> {
 
 /// Test the span yields correct positions in JSON.
 fn test_positions(code: &str, span: (u32, u32), expected_output: SpanTestData) {
+    static TEST_LOCALE_RESOURCES: &[&str] = &[crate::DEFAULT_LOCALE_RESOURCE];
     rustc_span::create_default_session_globals_then(|| {
         let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         sm.new_source_file(Path::new("test.rs").to_owned().into(), code.to_owned());
-        let fallback_bundle =
-            crate::fallback_fluent_bundle(rustc_error_messages::DEFAULT_LOCALE_RESOURCES, false);
+        let fallback_bundle = crate::fallback_fluent_bundle(TEST_LOCALE_RESOURCES, false);
 
         let output = Arc::new(Mutex::new(Vec::new()));
         let je = JsonEmitter::new(
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
index 8c39feca88a..edec8cce92f 100644
--- a/compiler/rustc_errors/src/lib.rs
+++ b/compiler/rustc_errors/src/lib.rs
@@ -36,11 +36,11 @@ use rustc_data_structures::stable_hasher::StableHasher;
 use rustc_data_structures::sync::{self, Lock, Lrc};
 use rustc_data_structures::AtomicRef;
 pub use rustc_error_messages::{
-    fallback_fluent_bundle, fluent, fluent_bundle, DelayDm, DiagnosticMessage, FluentBundle,
+    fallback_fluent_bundle, fluent_bundle, DelayDm, DiagnosticMessage, FluentBundle,
     LanguageIdentifier, LazyFallbackBundle, MultiSpan, SpanLabel, SubdiagnosticMessage,
-    DEFAULT_LOCALE_RESOURCES,
 };
 pub use rustc_lint_defs::{pluralize, Applicability};
+use rustc_macros::fluent_messages;
 use rustc_span::source_map::SourceMap;
 use rustc_span::HashStableContext;
 use rustc_span::{Loc, Span};
@@ -76,6 +76,8 @@ pub use snippet::Style;
 pub type PErr<'a> = DiagnosticBuilder<'a, ErrorGuaranteed>;
 pub type PResult<'a, T> = Result<T, PErr<'a>>;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 // `PResult` is used a lot. Make sure it doesn't unintentionally get bigger.
 // (See also the comment on `DiagnosticBuilderInner`'s `diagnostic` field.)
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
diff --git a/compiler/rustc_expand/locales/en-US.ftl b/compiler/rustc_expand/locales/en-US.ftl
new file mode 100644
index 00000000000..dbd80954382
--- /dev/null
+++ b/compiler/rustc_expand/locales/en-US.ftl
@@ -0,0 +1,131 @@
+expand_explain_doc_comment_outer =
+    outer doc comments expand to `#[doc = "..."]`, which is what this macro attempted to match
+
+expand_explain_doc_comment_inner =
+    inner doc comments expand to `#![doc = "..."]`, which is what this macro attempted to match
+
+expand_expr_repeat_no_syntax_vars =
+    attempted to repeat an expression containing no syntax variables matched as repeating at this depth
+
+expand_must_repeat_once =
+    this must repeat at least once
+
+expand_count_repetition_misplaced =
+    `count` can not be placed inside the inner-most repetition
+
+expand_meta_var_expr_unrecognized_var =
+    variable `{$key}` is not recognized in meta-variable expression
+
+expand_var_still_repeating =
+    variable '{$ident}' is still repeating at this depth
+
+expand_meta_var_dif_seq_matchers = {$msg}
+
+expand_macro_const_stability =
+    macros cannot have const stability attributes
+    .label = invalid const stability attribute
+    .label2 = const stability attribute affects this macro
+
+expand_macro_body_stability =
+    macros cannot have body stability attributes
+    .label = invalid body stability attribute
+    .label2 = body stability attribute affects this macro
+
+expand_resolve_relative_path =
+    cannot resolve relative path in non-file source `{$path}`
+
+expand_attr_no_arguments =
+    attribute must have either one or two arguments
+
+expand_not_a_meta_item =
+    not a meta item
+
+expand_only_one_word =
+    must only be one word
+
+expand_cannot_be_name_of_macro =
+    `{$trait_ident}` cannot be a name of {$macro_type} macro
+
+expand_arg_not_attributes =
+    second argument must be `attributes`
+
+expand_attributes_wrong_form =
+    attribute must be of form: `attributes(foo, bar)`
+
+expand_attribute_meta_item =
+    attribute must be a meta item, not a literal
+
+expand_attribute_single_word =
+    attribute must only be a single word
+
+expand_helper_attribute_name_invalid =
+    `{$name}` cannot be a name of derive helper attribute
+
+expand_expected_comma_in_list =
+    expected token: `,`
+
+expand_only_one_argument =
+    {$name} takes 1 argument
+
+expand_takes_no_arguments =
+    {$name} takes no arguments
+
+expand_feature_included_in_edition =
+    the feature `{$feature}` is included in the Rust {$edition} edition
+
+expand_feature_removed =
+    feature has been removed
+    .label = feature has been removed
+    .reason = {$reason}
+
+expand_feature_not_allowed =
+    the feature `{$name}` is not in the list of allowed features
+
+expand_recursion_limit_reached =
+    recursion limit reached while expanding `{$descr}`
+    .help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
+
+expand_malformed_feature_attribute =
+    malformed `feature` attribute input
+    .expected = expected just one word
+
+expand_remove_expr_not_supported =
+    removing an expression is not supported in this position
+
+expand_invalid_cfg_no_parens = `cfg` is not followed by parentheses
+expand_invalid_cfg_no_predicate = `cfg` predicate is not specified
+expand_invalid_cfg_multiple_predicates = multiple `cfg` predicates are specified
+expand_invalid_cfg_predicate_literal = `cfg` predicate key cannot be a literal
+expand_invalid_cfg_expected_syntax = expected syntax is
+
+expand_wrong_fragment_kind =
+    non-{$kind} macro in {$kind} position: {$name}
+
+expand_unsupported_key_value =
+    key-value macro attributes are not supported
+
+expand_incomplete_parse =
+    macro expansion ignores token `{$token}` and any following
+    .label = caused by the macro expansion here
+    .note = the usage of `{$macro_path}!` is likely invalid in {$kind_name} context
+    .suggestion_add_semi = you might be missing a semicolon here
+
+expand_remove_node_not_supported =
+    removing {$descr} is not supported in this position
+
+expand_module_circular =
+    circular modules: {$modules}
+
+expand_module_in_block =
+    cannot declare a non-inline module inside a block unless it has a path attribute
+    .note = maybe `use` the module `{$name}` instead of redeclaring it
+
+expand_module_file_not_found =
+    file not found for module `{$name}`
+    .help = to create the module `{$name}`, create file "{$default_path}" or "{$secondary_path}"
+
+expand_module_multiple_candidates =
+    file for module `{$name}` found at both "{$default_path}" and "{$secondary_path}"
+    .help = delete or rename one of them to remove the ambiguity
+
+expand_trace_macro = trace_macro
diff --git a/compiler/rustc_expand/src/errors.rs b/compiler/rustc_expand/src/errors.rs
index 9b9697ab13d..d9b2b5f4802 100644
--- a/compiler/rustc_expand/src/errors.rs
+++ b/compiler/rustc_expand/src/errors.rs
@@ -65,7 +65,7 @@ pub(crate) struct MacroConstStability {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(label2)]
+    #[label(expand_label2)]
     pub head_span: Span,
 }
 
@@ -75,7 +75,7 @@ pub(crate) struct MacroBodyStability {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(label2)]
+    #[label(expand_label2)]
     pub head_span: Span,
 }
 
@@ -188,7 +188,7 @@ pub(crate) struct FeatureRemoved<'a> {
 }
 
 #[derive(Subdiagnostic)]
-#[note(reason)]
+#[note(expand_reason)]
 pub(crate) struct FeatureRemovedReason<'a> {
     pub reason: &'a str,
 }
@@ -223,12 +223,12 @@ pub(crate) struct MalformedFeatureAttribute {
 
 #[derive(Subdiagnostic)]
 pub(crate) enum MalformedFeatureAttributeHelp {
-    #[label(expected)]
+    #[label(expand_expected)]
     Label {
         #[primary_span]
         span: Span,
     },
-    #[suggestion(expected, code = "{suggestion}", applicability = "maybe-incorrect")]
+    #[suggestion(expand_expected, code = "{suggestion}", applicability = "maybe-incorrect")]
     Suggestion {
         #[primary_span]
         span: Span,
@@ -306,7 +306,7 @@ pub(crate) struct IncompleteParse<'a> {
     pub kind_name: &'a str,
 
     #[suggestion(
-        suggestion_add_semi,
+        expand_suggestion_add_semi,
         style = "verbose",
         code = ";",
         applicability = "maybe-incorrect"
@@ -340,7 +340,7 @@ pub(crate) struct ModuleInBlock {
 }
 
 #[derive(Subdiagnostic)]
-#[note(note)]
+#[note(expand_note)]
 pub(crate) struct ModuleInBlockName {
     #[primary_span]
     pub span: Span,
diff --git a/compiler/rustc_expand/src/lib.rs b/compiler/rustc_expand/src/lib.rs
index 89726856635..634e206e58a 100644
--- a/compiler/rustc_expand/src/lib.rs
+++ b/compiler/rustc_expand/src/lib.rs
@@ -20,6 +20,9 @@ extern crate tracing;
 
 extern crate proc_macro as pm;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
 mod placeholders;
 mod proc_macro_server;
 
@@ -60,3 +63,5 @@ mod tokenstream {
 mod mut_visit {
     mod tests;
 }
+
+fluent_messages! { "../locales/en-US.ftl" }
diff --git a/compiler/rustc_expand/src/parse/tests.rs b/compiler/rustc_expand/src/parse/tests.rs
index 0726d922c84..a416300ba7e 100644
--- a/compiler/rustc_expand/src/parse/tests.rs
+++ b/compiler/rustc_expand/src/parse/tests.rs
@@ -17,8 +17,11 @@ use rustc_span::{BytePos, FileName, Pos, Span};
 
 use std::path::PathBuf;
 
+static TEST_LOCALE_RESOURCES: &[&str] =
+    &[crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE];
+
 fn sess() -> ParseSess {
-    ParseSess::new(FilePathMapping::empty())
+    ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty())
 }
 
 /// Parses an item.
diff --git a/compiler/rustc_expand/src/tests.rs b/compiler/rustc_expand/src/tests.rs
index f80141403bf..bd1b3ff28b7 100644
--- a/compiler/rustc_expand/src/tests.rs
+++ b/compiler/rustc_expand/src/tests.rs
@@ -34,7 +34,7 @@ where
 
 /// Maps a string to tts, using a made-up filename.
 pub(crate) fn string_to_stream(source_str: String) -> TokenStream {
-    let ps = ParseSess::new(FilePathMapping::empty());
+    let ps = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
     source_file_to_stream(
         &ps,
         ps.source_map().new_source_file(PathBuf::from("bogofile").into(), source_str),
@@ -45,7 +45,7 @@ pub(crate) fn string_to_stream(source_str: String) -> TokenStream {
 
 /// Parses a string, returns a crate.
 pub(crate) fn string_to_crate(source_str: String) -> ast::Crate {
-    let ps = ParseSess::new(FilePathMapping::empty());
+    let ps = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
     with_error_checking_parse(source_str, &ps, |p| p.parse_crate_mod())
 }
 
@@ -123,12 +123,14 @@ impl<T: Write> Write for Shared<T> {
     }
 }
 
+static TEST_LOCALE_RESOURCES: &[&str] =
+    &[crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE];
+
 fn test_harness(file_text: &str, span_labels: Vec<SpanLabel>, expected_output: &str) {
     create_default_session_if_not_set_then(|_| {
         let output = Arc::new(Mutex::new(Vec::new()));
 
-        let fallback_bundle =
-            rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+        let fallback_bundle = rustc_errors::fallback_fluent_bundle(TEST_LOCALE_RESOURCES, false);
         let source_map = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         source_map.new_source_file(Path::new("test.rs").to_owned().into(), file_text.to_owned());
 
diff --git a/compiler/rustc_hir_analysis/locales/en-US.ftl b/compiler/rustc_hir_analysis/locales/en-US.ftl
new file mode 100644
index 00000000000..aa56e60ec75
--- /dev/null
+++ b/compiler/rustc_hir_analysis/locales/en-US.ftl
@@ -0,0 +1,131 @@
+hir_analysis_unrecognized_atomic_operation =
+    unrecognized atomic operation function: `{$op}`
+    .label = unrecognized atomic operation
+
+hir_analysis_wrong_number_of_generic_arguments_to_intrinsic =
+    intrinsic has wrong number of {$descr} parameters: found {$found}, expected {$expected}
+    .label = expected {$expected} {$descr} {$expected ->
+        [one] parameter
+        *[other] parameters
+    }
+
+hir_analysis_unrecognized_intrinsic_function =
+    unrecognized intrinsic function: `{$name}`
+    .label = unrecognized intrinsic
+
+hir_analysis_lifetimes_or_bounds_mismatch_on_trait =
+    lifetime parameters or bounds on {$item_kind} `{$ident}` do not match the trait declaration
+    .label = lifetimes do not match {$item_kind} in trait
+    .generics_label = lifetimes in impl do not match this {$item_kind} in trait
+    .where_label = this `where` clause might not match the one in the trait
+    .bounds_label = this bound might be missing in the impl
+
+hir_analysis_async_trait_impl_should_be_async =
+    method `{$method_name}` should be async because the method from the trait is async
+    .trait_item_label = required because the trait method is async
+
+hir_analysis_drop_impl_on_wrong_item =
+    the `Drop` trait may only be implemented for local structs, enums, and unions
+    .label = must be a struct, enum, or union in the current crate
+
+hir_analysis_field_already_declared =
+    field `{$field_name}` is already declared
+    .label = field already declared
+    .previous_decl_label = `{$field_name}` first declared here
+
+hir_analysis_expected_used_symbol = expected `used`, `used(compiler)` or `used(linker)`
+
+hir_analysis_ambiguous_lifetime_bound =
+    ambiguous lifetime bound, explicit lifetime bound required
+
+hir_analysis_assoc_type_binding_not_allowed =
+    associated type bindings are not allowed here
+    .label = associated type not allowed here
+
+hir_analysis_typeof_reserved_keyword_used =
+    `typeof` is a reserved keyword but unimplemented
+    .suggestion = consider replacing `typeof(...)` with an actual type
+    .label = reserved keyword
+
+hir_analysis_value_of_associated_struct_already_specified =
+    the value of the associated type `{$item_name}` (from trait `{$def_path}`) is already specified
+    .label = re-bound here
+    .previous_bound_label = `{$item_name}` bound here first
+
+hir_analysis_unconstrained_opaque_type = unconstrained opaque type
+    .note = `{$name}` must be used in combination with a concrete type within the same {$what}
+
+hir_analysis_manual_implementation =
+    manual implementations of `{$trait_name}` are experimental
+    .label = manual implementations of `{$trait_name}` are experimental
+    .help = add `#![feature(unboxed_closures)]` to the crate attributes to enable
+
+hir_analysis_substs_on_overridden_impl = could not resolve substs on overridden impl
+
+hir_analysis_unused_extern_crate =
+    unused extern crate
+    .suggestion = remove it
+
+hir_analysis_extern_crate_not_idiomatic =
+    `extern crate` is not idiomatic in the new edition
+    .suggestion = convert it to a `{$msg_code}`
+
+hir_analysis_trait_object_declared_with_no_traits =
+    at least one trait is required for an object type
+    .alias_span = this alias does not contain a trait
+
+hir_analysis_missing_type_params =
+    the type {$parameterCount ->
+        [one] parameter
+        *[other] parameters
+    } {$parameters} must be explicitly specified
+    .label = type {$parameterCount ->
+        [one] parameter
+        *[other] parameters
+    } {$parameters} must be specified for this
+    .suggestion = set the type {$parameterCount ->
+        [one] parameter
+        *[other] parameters
+    } to the desired {$parameterCount ->
+        [one] type
+        *[other] types
+    }
+    .no_suggestion_label = missing {$parameterCount ->
+        [one] reference
+        *[other] references
+    } to {$parameters}
+    .note = because of the default `Self` reference, type parameters must be specified on object types
+
+hir_analysis_copy_impl_on_type_with_dtor =
+    the trait `Copy` may not be implemented for this type; the type has a destructor
+    .label = `Copy` not allowed on types with destructors
+
+hir_analysis_multiple_relaxed_default_bounds =
+    type parameter has more than one relaxed default bound, only one is supported
+
+hir_analysis_copy_impl_on_non_adt =
+    the trait `Copy` may not be implemented for this type
+    .label = type is not a structure or enumeration
+
+hir_analysis_const_impl_for_non_const_trait =
+    const `impl` for trait `{$trait_name}` which is not marked with `#[const_trait]`
+    .suggestion = mark `{$trait_name}` as const
+    .note = marking a trait with `#[const_trait]` ensures all default method bodies are `const`
+    .adding = adding a non-const method body in the future would be a breaking change
+
+hir_analysis_const_bound_for_non_const_trait =
+    ~const can only be applied to `#[const_trait]` traits
+
+hir_analysis_self_in_impl_self =
+    `Self` is not valid in the self type of an impl block
+    .note = replace `Self` with a different type
+
+hir_analysis_linkage_type =
+    invalid type for variable with `#[linkage]` attribute
+
+hir_analysis_auto_deref_reached_recursion_limit = reached the recursion limit while auto-dereferencing `{$ty}`
+    .label = deref recursion limit reached
+    .help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
+
+hir_analysis_track_caller_on_main = `main` function is not allowed to be `#[track_caller]`
+    .label = `main` function is not allowed to be `#[track_caller]`
diff --git a/compiler/rustc_hir_analysis/src/errors.rs b/compiler/rustc_hir_analysis/src/errors.rs
index f3c3c02a05f..be3ef03192c 100644
--- a/compiler/rustc_hir_analysis/src/errors.rs
+++ b/compiler/rustc_hir_analysis/src/errors.rs
@@ -1,7 +1,10 @@
 //! Errors emitted by `rustc_hir_analysis`.
 
-use rustc_errors::{error_code, Applicability, DiagnosticBuilder, ErrorGuaranteed, Handler};
-use rustc_errors::{IntoDiagnostic, MultiSpan};
+use crate::fluent_generated as fluent;
+use rustc_errors::{
+    error_code, Applicability, DiagnosticBuilder, ErrorGuaranteed, Handler, IntoDiagnostic,
+    MultiSpan,
+};
 use rustc_macros::{Diagnostic, LintDiagnostic};
 use rustc_middle::ty::Ty;
 use rustc_span::{symbol::Ident, Span, Symbol};
@@ -41,11 +44,11 @@ pub struct LifetimesOrBoundsMismatchOnTrait {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(generics_label)]
+    #[label(hir_analysis_generics_label)]
     pub generics_span: Option<Span>,
-    #[label(where_label)]
+    #[label(hir_analysis_where_label)]
     pub where_span: Option<Span>,
-    #[label(bounds_label)]
+    #[label(hir_analysis_bounds_label)]
     pub bounds_span: Vec<Span>,
     pub item_kind: &'static str,
     pub ident: Ident,
@@ -57,7 +60,7 @@ pub struct AsyncTraitImplShouldBeAsync {
     #[primary_span]
     // #[label]
     pub span: Span,
-    #[label(trait_item_label)]
+    #[label(hir_analysis_trait_item_label)]
     pub trait_item_span: Option<Span>,
     pub method_name: Symbol,
 }
@@ -77,7 +80,7 @@ pub struct FieldAlreadyDeclared {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(previous_decl_label)]
+    #[label(hir_analysis_previous_decl_label)]
     pub prev_span: Span,
 }
 
@@ -109,7 +112,7 @@ pub struct CopyImplOnNonAdt {
 pub struct TraitObjectDeclaredWithNoTraits {
     #[primary_span]
     pub span: Span,
-    #[label(alias_span)]
+    #[label(hir_analysis_alias_span)]
     pub trait_alias_span: Option<Span>,
 }
 
@@ -145,7 +148,7 @@ pub struct ValueOfAssociatedStructAlreadySpecified {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(previous_bound_label)]
+    #[label(hir_analysis_previous_bound_label)]
     pub prev_span: Span,
     pub item_name: Ident,
     pub def_path: String,
@@ -175,7 +178,7 @@ impl<'a> IntoDiagnostic<'a> for MissingTypeParams {
     fn into_diagnostic(self, handler: &'a Handler) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
         let mut err = handler.struct_span_err_with_code(
             self.span,
-            rustc_errors::fluent::hir_analysis_missing_type_params,
+            fluent::hir_analysis_missing_type_params,
             error_code!(E0393),
         );
         err.set_arg("parameterCount", self.missing_type_params.len());
@@ -188,7 +191,7 @@ impl<'a> IntoDiagnostic<'a> for MissingTypeParams {
                 .join(", "),
         );
 
-        err.span_label(self.def_span, rustc_errors::fluent::label);
+        err.span_label(self.def_span, fluent::hir_analysis_label);
 
         let mut suggested = false;
         // Don't suggest setting the type params if there are some already: the order is
@@ -203,7 +206,7 @@ impl<'a> IntoDiagnostic<'a> for MissingTypeParams {
                 // least we can clue them to the correct syntax `Iterator<Type>`.
                 err.span_suggestion(
                     self.span,
-                    rustc_errors::fluent::suggestion,
+                    fluent::hir_analysis_suggestion,
                     format!(
                         "{}<{}>",
                         snippet,
@@ -219,10 +222,10 @@ impl<'a> IntoDiagnostic<'a> for MissingTypeParams {
             }
         }
         if !suggested {
-            err.span_label(self.span, rustc_errors::fluent::no_suggestion_label);
+            err.span_label(self.span, fluent::hir_analysis_no_suggestion_label);
         }
 
-        err.note(rustc_errors::fluent::note);
+        err.note(fluent::hir_analysis_note);
         err
     }
 }
@@ -274,7 +277,7 @@ pub struct ConstImplForNonConstTrait {
     pub local_trait_span: Option<Span>,
     #[note]
     pub marking: (),
-    #[note(adding)]
+    #[note(hir_analysis_adding)]
     pub adding: (),
 }
 
diff --git a/compiler/rustc_hir_analysis/src/lib.rs b/compiler/rustc_hir_analysis/src/lib.rs
index 73a71376662..d54e569905f 100644
--- a/compiler/rustc_hir_analysis/src/lib.rs
+++ b/compiler/rustc_hir_analysis/src/lib.rs
@@ -99,9 +99,11 @@ pub mod structured_errors;
 mod variance;
 
 use rustc_errors::{struct_span_err, ErrorGuaranteed};
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_hir as hir;
 use rustc_hir::Node;
 use rustc_infer::infer::{InferOk, TyCtxtInferExt};
+use rustc_macros::fluent_messages;
 use rustc_middle::middle;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::{self, Ty, TyCtxt};
@@ -118,6 +120,8 @@ use std::ops::Not;
 use astconv::AstConv;
 use bounds::Bounds;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 fn require_c_abi_if_c_variadic(tcx: TyCtxt<'_>, decl: &hir::FnDecl<'_>, abi: Abi, span: Span) {
     const ERROR_HEAD: &str = "C-variadic function must have a compatible calling convention";
     const CONVENTIONS_UNSTABLE: &str = "`C`, `cdecl`, `win64`, `sysv64` or `efiapi`";
diff --git a/compiler/rustc_hir_typeck/locales/en-US.ftl b/compiler/rustc_hir_typeck/locales/en-US.ftl
new file mode 100644
index 00000000000..adfcbc36a4d
--- /dev/null
+++ b/compiler/rustc_hir_typeck/locales/en-US.ftl
@@ -0,0 +1,79 @@
+hir_typeck_field_multiply_specified_in_initializer =
+    field `{$ident}` specified more than once
+    .label = used more than once
+    .previous_use_label = first use of `{$ident}`
+
+hir_typeck_copy_impl_on_type_with_dtor =
+    the trait `Copy` may not be implemented for this type; the type has a destructor
+    .label = `Copy` not allowed on types with destructors
+
+hir_typeck_multiple_relaxed_default_bounds =
+    type parameter has more than one relaxed default bound, only one is supported
+
+hir_typeck_copy_impl_on_non_adt =
+    the trait `Copy` may not be implemented for this type
+    .label = type is not a structure or enumeration
+
+hir_typeck_trait_object_declared_with_no_traits =
+    at least one trait is required for an object type
+    .alias_span = this alias does not contain a trait
+
+hir_typeck_functional_record_update_on_non_struct =
+    functional record update syntax requires a struct
+
+hir_typeck_return_stmt_outside_of_fn_body =
+    return statement outside of function body
+    .encl_body_label = the return is part of this body...
+    .encl_fn_label = ...not the enclosing function body
+
+hir_typeck_yield_expr_outside_of_generator =
+    yield expression outside of generator literal
+
+hir_typeck_struct_expr_non_exhaustive =
+    cannot create non-exhaustive {$what} using struct expression
+
+hir_typeck_method_call_on_unknown_type =
+    the type of this value must be known to call a method on a raw pointer on it
+
+hir_typeck_address_of_temporary_taken = cannot take address of a temporary
+    .label = temporary value
+
+hir_typeck_add_return_type_add = try adding a return type
+
+hir_typeck_add_return_type_missing_here = a return type might be missing here
+
+hir_typeck_expected_default_return_type = expected `()` because of default return type
+
+hir_typeck_expected_return_type = expected `{$expected}` because of return type
+
+hir_typeck_missing_parentheses_in_range = can't call method `{$method_name}` on type `{$ty_str}`
+
+hir_typeck_add_missing_parentheses_in_range = you must surround the range in parentheses to call its `{$func_name}` function
+
+hir_typeck_lang_start_incorrect_number_params = incorrect number of parameters for the `start` lang item
+hir_typeck_lang_start_incorrect_number_params_note_expected_count = the `start` lang item should have four parameters, but found {$found_param_count}
+
+hir_typeck_lang_start_expected_sig_note = the `start` lang item should have the signature `fn(fn() -> T, isize, *const *const u8, u8) -> isize`
+
+hir_typeck_lang_start_incorrect_param = parameter {$param_num} of the `start` lang item is incorrect
+    .suggestion = change the type from `{$found_ty}` to `{$expected_ty}`
+
+hir_typeck_lang_start_incorrect_ret_ty = the return type of the `start` lang item is incorrect
+    .suggestion = change the type from `{$found_ty}` to `{$expected_ty}`
+
+hir_typeck_help_set_edition_cargo = set `edition = "{$edition}"` in `Cargo.toml`
+hir_typeck_help_set_edition_standalone = pass `--edition {$edition}` to `rustc`
+hir_typeck_note_edition_guide = for more on editions, read https://doc.rust-lang.org/edition-guide
+
+hir_typeck_convert_to_str = try converting the passed type into a `&str`
+
+hir_typeck_op_trait_generic_params = `{$method_name}` must not have any generic parameters
+
+hir_typeck_fru_note = this expression may have been misinterpreted as a `..` range expression
+hir_typeck_fru_expr = this expression does not end in a comma...
+hir_typeck_fru_expr2 = ... so this is interpreted as a `..` range expression, instead of functional record update syntax
+hir_typeck_fru_suggestion =
+    to set the remaining fields{$expr ->
+        [NONE]{""}
+        *[other] {" "}from `{$expr}`
+    }, separate the last named field with a comma
diff --git a/compiler/rustc_hir_typeck/src/errors.rs b/compiler/rustc_hir_typeck/src/errors.rs
index 2c8979402b6..3eee2278dca 100644
--- a/compiler/rustc_hir_typeck/src/errors.rs
+++ b/compiler/rustc_hir_typeck/src/errors.rs
@@ -1,4 +1,5 @@
 //! Errors emitted by `rustc_hir_typeck`.
+use crate::fluent_generated as fluent;
 use rustc_errors::{AddToDiagnostic, Applicability, Diagnostic, MultiSpan, SubdiagnosticMessage};
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_middle::ty::Ty;
@@ -14,7 +15,7 @@ pub struct FieldMultiplySpecifiedInInitializer {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(previous_use_label)]
+    #[label(hir_typeck_previous_use_label)]
     pub prev_span: Span,
     pub ident: Ident,
 }
@@ -24,9 +25,9 @@ pub struct FieldMultiplySpecifiedInInitializer {
 pub struct ReturnStmtOutsideOfFnBody {
     #[primary_span]
     pub span: Span,
-    #[label(encl_body_label)]
+    #[label(hir_typeck_encl_body_label)]
     pub encl_body_span: Option<Span>,
-    #[label(encl_fn_label)]
+    #[label(hir_typeck_encl_fn_label)]
     pub encl_fn_span: Option<Span>,
 }
 
@@ -157,20 +158,17 @@ impl AddToDiagnostic for TypeMismatchFruTypo {
 
         // Only explain that `a ..b` is a range if it's split up
         if self.expr_span.between(self.fru_span).is_empty() {
-            diag.span_note(
-                self.expr_span.to(self.fru_span),
-                rustc_errors::fluent::hir_typeck_fru_note,
-            );
+            diag.span_note(self.expr_span.to(self.fru_span), fluent::hir_typeck_fru_note);
         } else {
             let mut multispan: MultiSpan = vec![self.expr_span, self.fru_span].into();
-            multispan.push_span_label(self.expr_span, rustc_errors::fluent::hir_typeck_fru_expr);
-            multispan.push_span_label(self.fru_span, rustc_errors::fluent::hir_typeck_fru_expr2);
-            diag.span_note(multispan, rustc_errors::fluent::hir_typeck_fru_note);
+            multispan.push_span_label(self.expr_span, fluent::hir_typeck_fru_expr);
+            multispan.push_span_label(self.fru_span, fluent::hir_typeck_fru_expr2);
+            diag.span_note(multispan, fluent::hir_typeck_fru_note);
         }
 
         diag.span_suggestion(
             self.expr_span.shrink_to_hi(),
-            rustc_errors::fluent::hir_typeck_fru_suggestion,
+            fluent::hir_typeck_fru_suggestion,
             ", ",
             Applicability::MaybeIncorrect,
         );
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
index 3539202d1ca..3f3323cc1af 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
@@ -1,9 +1,10 @@
 use super::FnCtxt;
 
 use crate::errors::{AddReturnTypeSuggestion, ExpectedReturnTypeLabel};
+use crate::fluent_generated as fluent;
 use crate::method::probe::{IsSuggestion, Mode, ProbeScope};
 use rustc_ast::util::parser::{ExprPrecedence, PREC_POSTFIX};
-use rustc_errors::{fluent, Applicability, Diagnostic, MultiSpan};
+use rustc_errors::{Applicability, Diagnostic, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::{CtorKind, CtorOf, DefKind};
 use rustc_hir::lang_items::LangItem;
diff --git a/compiler/rustc_hir_typeck/src/lib.rs b/compiler/rustc_hir_typeck/src/lib.rs
index 0204beb6fb8..57c6c155a4d 100644
--- a/compiler/rustc_hir_typeck/src/lib.rs
+++ b/compiler/rustc_hir_typeck/src/lib.rs
@@ -53,7 +53,10 @@ use crate::check::check_fn;
 use crate::coercion::DynamicCoerceMany;
 use crate::gather_locals::GatherLocalsVisitor;
 use rustc_data_structures::unord::UnordSet;
-use rustc_errors::{struct_span_err, DiagnosticId, ErrorGuaranteed, MultiSpan};
+use rustc_errors::{
+    struct_span_err, DiagnosticId, DiagnosticMessage, ErrorGuaranteed, MultiSpan,
+    SubdiagnosticMessage,
+};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::intravisit::Visitor;
@@ -61,6 +64,7 @@ use rustc_hir::{HirIdMap, Node};
 use rustc_hir_analysis::astconv::AstConv;
 use rustc_hir_analysis::check::check_abi;
 use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
+use rustc_macros::fluent_messages;
 use rustc_middle::traits;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::{self, Ty, TyCtxt};
@@ -69,6 +73,8 @@ use rustc_session::Session;
 use rustc_span::def_id::{DefId, LocalDefId};
 use rustc_span::Span;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 #[macro_export]
 macro_rules! type_error_struct {
     ($session:expr, $span:expr, $typ:expr, $code:ident, $($message:tt)*) => ({
diff --git a/compiler/rustc_incremental/locales/en-US.ftl b/compiler/rustc_incremental/locales/en-US.ftl
new file mode 100644
index 00000000000..4852ee0d959
--- /dev/null
+++ b/compiler/rustc_incremental/locales/en-US.ftl
@@ -0,0 +1,118 @@
+incremental_unrecognized_depnode = unrecognized `DepNode` variant: {$name}
+
+incremental_missing_depnode = missing `DepNode` variant
+
+incremental_missing_if_this_changed = no `#[rustc_if_this_changed]` annotation detected
+
+incremental_no_path = no path from `{$source}` to `{$target}`
+
+incremental_ok = OK
+
+incremental_unknown_reuse_kind = unknown cgu-reuse-kind `{$kind}` specified
+
+incremental_missing_query_depgraph =
+    found CGU-reuse attribute but `-Zquery-dep-graph` was not specified
+
+incremental_malformed_cgu_name =
+    found malformed codegen unit name `{$user_path}`. codegen units names must always start with the name of the crate (`{$crate_name}` in this case).
+
+incremental_no_module_named =
+    no module named `{$user_path}` (mangled: {$cgu_name}). available modules: {$cgu_names}
+
+incremental_field_associated_value_expected = associated value expected for `{$name}`
+
+incremental_no_field = no field `{$name}`
+
+incremental_assertion_auto =
+    `except` specified DepNodes that can not be affected for \"{$name}\": \"{$e}\"
+
+incremental_undefined_clean_dirty_assertions_item =
+    clean/dirty auto-assertions not yet defined for Node::Item.node={$kind}
+
+incremental_undefined_clean_dirty_assertions =
+    clean/dirty auto-assertions not yet defined for {$kind}
+
+incremental_repeated_depnode_label = dep-node label `{$label}` is repeated
+
+incremental_unrecognized_depnode_label = dep-node label `{$label}` not recognized
+
+incremental_not_dirty = `{$dep_node_str}` should be dirty but is not
+
+incremental_not_clean = `{$dep_node_str}` should be clean but is not
+
+incremental_not_loaded = `{$dep_node_str}` should have been loaded from disk but it was not
+
+incremental_unknown_item = unknown item `{$name}`
+
+incremental_no_cfg = no cfg attribute
+
+incremental_associated_value_expected_for = associated value expected for `{$ident}`
+
+incremental_associated_value_expected = expected an associated value
+
+incremental_unchecked_clean = found unchecked `#[rustc_clean]` attribute
+
+incremental_delete_old = unable to delete old {$name} at `{$path}`: {$err}
+
+incremental_create_new = failed to create {$name} at `{$path}`: {$err}
+
+incremental_write_new = failed to write {$name} to `{$path}`: {$err}
+
+incremental_canonicalize_path = incremental compilation: error canonicalizing path `{$path}`: {$err}
+
+incremental_create_incr_comp_dir =
+    could not create incremental compilation {$tag} directory `{$path}`: {$err}
+
+incremental_create_lock =
+    incremental compilation: could not create session directory lock file: {$lock_err}
+incremental_lock_unsupported =
+    the filesystem for the incremental path at {$session_dir} does not appear to support locking, consider changing the incremental path to a filesystem that supports locking or disable incremental compilation
+incremental_cargo_help_1 =
+    incremental compilation can be disabled by setting the environment variable CARGO_INCREMENTAL=0 (see https://doc.rust-lang.org/cargo/reference/profiles.html#incremental)
+incremental_cargo_help_2 =
+    the entire build directory can be changed to a different filesystem by setting the environment variable CARGO_TARGET_DIR to a different path (see https://doc.rust-lang.org/cargo/reference/config.html#buildtarget-dir)
+
+incremental_delete_lock =
+    error deleting lock file for incremental compilation session directory `{$path}`: {$err}
+
+incremental_hard_link_failed =
+    hard linking files in the incremental compilation cache failed. copying files instead. consider moving the cache directory to a file system which supports hard linking in session dir `{$path}`
+
+incremental_delete_partial = failed to delete partly initialized session dir `{$path}`: {$err}
+
+incremental_delete_full = error deleting incremental compilation session directory `{$path}`: {$err}
+
+incremental_finalize = error finalizing incremental compilation session directory `{$path}`: {$err}
+
+incremental_invalid_gc_failed =
+    failed to garbage collect invalid incremental compilation session directory `{$path}`: {$err}
+
+incremental_finalized_gc_failed =
+    failed to garbage collect finalized incremental compilation session directory `{$path}`: {$err}
+
+incremental_session_gc_failed =
+    failed to garbage collect incremental compilation session directory `{$path}`: {$err}
+
+incremental_assert_not_loaded =
+    we asserted that the incremental cache should not be loaded, but it was loaded
+
+incremental_assert_loaded =
+    we asserted that an existing incremental cache directory should be successfully loaded, but it was not
+
+incremental_delete_incompatible =
+    failed to delete invalidated or incompatible incremental compilation session directory contents `{$path}`: {$err}
+
+incremental_load_dep_graph = could not load dep-graph from `{$path}`: {$err}
+
+incremental_decode_incr_cache = could not decode incremental cache: {$err}
+
+incremental_write_dep_graph = failed to write dependency graph to `{$path}`: {$err}
+
+incremental_move_dep_graph = failed to move dependency graph from `{$from}` to `{$to}`: {$err}
+
+incremental_create_dep_graph = failed to create dependency graph at `{$path}`: {$err}
+
+incremental_copy_workproduct_to_cache =
+    error copying object file `{$from}` to incremental directory as `{$to}`: {$err}
+
+incremental_delete_workproduct = file-system error deleting outdated file `{$path}`: {$err}
diff --git a/compiler/rustc_incremental/src/lib.rs b/compiler/rustc_incremental/src/lib.rs
index 3c58cfa38f2..511e466c2ae 100644
--- a/compiler/rustc_incremental/src/lib.rs
+++ b/compiler/rustc_incremental/src/lib.rs
@@ -31,3 +31,8 @@ pub use persist::save_dep_graph;
 pub use persist::save_work_product_index;
 pub use persist::LoadResult;
 pub use persist::{build_dep_graph, load_dep_graph, DepGraphFuture};
+
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
+fluent_messages! { "../locales/en-US.ftl" }
diff --git a/compiler/rustc_infer/locales/en-US.ftl b/compiler/rustc_infer/locales/en-US.ftl
new file mode 100644
index 00000000000..c5b2b6c2d73
--- /dev/null
+++ b/compiler/rustc_infer/locales/en-US.ftl
@@ -0,0 +1,347 @@
+infer_opaque_hidden_type =
+    opaque type's hidden type cannot be another opaque type from the same scope
+    .label = one of the two opaque types used here has to be outside its defining scope
+    .opaque_type = opaque type whose hidden type is being assigned
+    .hidden_type = opaque type being used as hidden type
+
+infer_type_annotations_needed = {$source_kind ->
+    [closure] type annotations needed for the closure `{$source_name}`
+    [normal] type annotations needed for `{$source_name}`
+    *[other] type annotations needed
+}
+    .label = type must be known at this point
+
+infer_label_bad = {$bad_kind ->
+    *[other] cannot infer type
+    [more_info] cannot infer {$prefix_kind ->
+        *[type] type for {$prefix}
+        [const_with_param] the value of const parameter
+        [const] the value of the constant
+    } `{$name}`{$has_parent ->
+        [true] {" "}declared on the {$parent_prefix} `{$parent_name}`
+        *[false] {""}
+    }
+}
+
+infer_source_kind_subdiag_let = {$kind ->
+    [with_pattern] consider giving `{$name}` an explicit type
+    [closure] consider giving this closure parameter an explicit type
+    *[other] consider giving this pattern a type
+}{$x_kind ->
+    [has_name] , where the {$prefix_kind ->
+        *[type] type for {$prefix}
+        [const_with_param] the value of const parameter
+        [const] the value of the constant
+    } `{$arg_name}` is specified
+    [underscore] , where the placeholders `_` are specified
+    *[empty] {""}
+}
+
+infer_source_kind_subdiag_generic_label =
+    cannot infer {$is_type ->
+    [true] type
+    *[false] the value
+    } of the {$is_type ->
+    [true] type
+    *[false] const
+    } {$parent_exists ->
+    [true] parameter `{$param_name}` declared on the {$parent_prefix} `{$parent_name}`
+    *[false] parameter {$param_name}
+    }
+
+infer_source_kind_subdiag_generic_suggestion =
+    consider specifying the generic {$arg_count ->
+    [one] argument
+    *[other] arguments
+    }
+
+infer_source_kind_fully_qualified =
+    try using a fully qualified path to specify the expected types
+
+infer_source_kind_closure_return =
+    try giving this closure an explicit return type
+
+# generator_kind  may need to be translated
+infer_need_type_info_in_generator =
+    type inside {$generator_kind ->
+    [async_block] `async` block
+    [async_closure] `async` closure
+    [async_fn] `async fn` body
+    *[generator] generator
+    } must be known in this context
+
+
+infer_subtype = ...so that the {$requirement ->
+    [method_compat] method type is compatible with trait
+    [type_compat] associated type is compatible with trait
+    [const_compat] const is compatible with trait
+    [expr_assignable] expression is assignable
+    [if_else_different] `if` and `else` have incompatible types
+    [no_else] `if` missing an `else` returns `()`
+    [fn_main_correct_type] `main` function has the correct type
+    [fn_start_correct_type] #[start]` function has the correct type
+    [intristic_correct_type] intrinsic has the correct type
+    [method_correct_type] method receiver has the correct type
+    *[other] types are compatible
+}
+infer_subtype_2 = ...so that {$requirement ->
+    [method_compat] method type is compatible with trait
+    [type_compat] associated type is compatible with trait
+    [const_compat] const is compatible with trait
+    [expr_assignable] expression is assignable
+    [if_else_different] `if` and `else` have incompatible types
+    [no_else] `if` missing an `else` returns `()`
+    [fn_main_correct_type] `main` function has the correct type
+    [fn_start_correct_type] #[start]` function has the correct type
+    [intristic_correct_type] intrinsic has the correct type
+    [method_correct_type] method receiver has the correct type
+    *[other] types are compatible
+}
+
+infer_reborrow = ...so that reference does not outlive borrowed content
+infer_reborrow_upvar = ...so that closure can access `{$name}`
+infer_relate_object_bound = ...so that it can be closed over into an object
+infer_reference_outlives_referent = ...so that the reference type `{$name}` does not outlive the data it points at
+infer_relate_param_bound = ...so that the type `{$name}` will meet its required lifetime bounds{$continues ->
+    [true] ...
+    *[false] {""}
+}
+infer_relate_param_bound_2 = ...that is required by this bound
+infer_relate_region_param_bound = ...so that the declared lifetime parameter bounds are satisfied
+infer_compare_impl_item_obligation = ...so that the definition in impl matches the definition from the trait
+infer_ascribe_user_type_prove_predicate = ...so that the where clause holds
+
+infer_nothing = {""}
+
+infer_lifetime_mismatch = lifetime mismatch
+
+infer_declared_different = this parameter and the return type are declared with different lifetimes...
+infer_data_returned = ...but data{$label_var1_exists ->
+    [true] {" "}from `{$label_var1}`
+    *[false] {""}
+} is returned here
+
+infer_data_lifetime_flow = ...but data with one lifetime flows into the other here
+infer_declared_multiple = this type is declared with multiple lifetimes...
+infer_types_declared_different = these two types are declared with different lifetimes...
+infer_data_flows = ...but data{$label_var1_exists ->
+    [true] {" "}from `{$label_var1}`
+    *[false] -> {""}
+} flows{$label_var2_exists ->
+    [true] {" "}into `{$label_var2}`
+    *[false] -> {""}
+} here
+
+infer_lifetime_param_suggestion = consider introducing a named lifetime parameter{$is_impl ->
+    [true] {" "}and update trait if needed
+    *[false] {""}
+}
+infer_lifetime_param_suggestion_elided = each elided lifetime in input position becomes a distinct lifetime
+
+infer_region_explanation = {$pref_kind ->
+    *[should_not_happen] [{$pref_kind}]
+    [ref_valid_for] ...the reference is valid for
+    [content_valid_for] ...but the borrowed content is only valid for
+    [type_obj_valid_for] object type is valid for
+    [source_pointer_valid_for] source pointer is only valid for
+    [type_satisfy] type must satisfy
+    [type_outlive] type must outlive
+    [lf_param_instantiated_with] lifetime parameter instantiated with
+    [lf_param_must_outlive] but lifetime parameter must outlive
+    [lf_instantiated_with] lifetime instantiated with
+    [lf_must_outlive] but lifetime must outlive
+    [pointer_valid_for] the pointer is valid for
+    [data_valid_for] but the referenced data is only valid for
+    [empty] {""}
+}{$pref_kind ->
+    [empty] {""}
+    *[other] {" "}
+}{$desc_kind ->
+    *[should_not_happen] [{$desc_kind}]
+    [restatic] the static lifetime
+    [revar] lifetime {$desc_arg}
+    [as_defined] the lifetime `{$desc_arg}` as defined here
+    [as_defined_anon] the anonymous lifetime as defined here
+    [defined_here] the anonymous lifetime defined here
+    [anon_num_here] the anonymous lifetime #{$desc_num_arg} defined here
+    [defined_here_reg] the lifetime `{$desc_arg}` as defined here
+}{$suff_kind ->
+    *[should_not_happen] [{$suff_kind}]
+    [empty]{""}
+    [continues] ...
+    [req_by_binding] {" "}as required by this binding
+}
+
+infer_outlives_content = lifetime of reference outlives lifetime of borrowed content...
+infer_outlives_bound = lifetime of the source pointer does not outlive lifetime bound of the object type
+infer_fullfill_req_lifetime = the type `{$ty}` does not fulfill the required lifetime
+infer_lf_bound_not_satisfied = lifetime bound not satisfied
+infer_borrowed_too_long = a value of type `{$ty}` is borrowed for too long
+infer_ref_longer_than_data = in type `{$ty}`, reference has a longer lifetime than the data it references
+
+infer_mismatched_static_lifetime = incompatible lifetime on type
+infer_does_not_outlive_static_from_impl = ...does not necessarily outlive the static lifetime introduced by the compatible `impl`
+infer_implicit_static_lifetime_note = this has an implicit `'static` lifetime requirement
+infer_implicit_static_lifetime_suggestion = consider relaxing the implicit `'static` requirement
+infer_msl_introduces_static = introduces a `'static` lifetime requirement
+infer_msl_unmet_req = because this has an unmet lifetime requirement
+infer_msl_trait_note = this has an implicit `'static` lifetime requirement
+infer_msl_trait_sugg = consider relaxing the implicit `'static` requirement
+infer_suggest_add_let_for_letchains = consider adding `let`
+
+infer_explicit_lifetime_required_with_ident = explicit lifetime required in the type of `{$simple_ident}`
+    .label = lifetime `{$named}` required
+
+infer_explicit_lifetime_required_with_param_type = explicit lifetime required in parameter type
+    .label = lifetime `{$named}` required
+
+infer_explicit_lifetime_required_sugg_with_ident = add explicit lifetime `{$named}` to the type of `{$simple_ident}`
+
+infer_explicit_lifetime_required_sugg_with_param_type = add explicit lifetime `{$named}` to type
+
+infer_actual_impl_expl_expected_signature_two = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`, for any two lifetimes `'{$lifetime_1}` and `'{$lifetime_2}`...
+infer_actual_impl_expl_expected_signature_any = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`, for any lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_signature_some = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`, for some specific lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_signature_nothing = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`
+infer_actual_impl_expl_expected_passive_two = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`, for any two lifetimes `'{$lifetime_1}` and `'{$lifetime_2}`...
+infer_actual_impl_expl_expected_passive_any = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`, for any lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_passive_some = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`, for some specific lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_passive_nothing = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`
+infer_actual_impl_expl_expected_other_two = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$ty_or_sig}` must implement `{$trait_path}`, for any two lifetimes `'{$lifetime_1}` and `'{$lifetime_2}`...
+infer_actual_impl_expl_expected_other_any = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$ty_or_sig}` must implement `{$trait_path}`, for any lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_other_some = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$ty_or_sig}` must implement `{$trait_path}`, for some specific lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_other_nothing = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$ty_or_sig}` must implement `{$trait_path}`
+
+infer_actual_impl_expl_but_actually_implements_trait = ...but it actually implements `{$trait_path}`{$has_lifetime ->
+    [true] , for some specific lifetime `'{$lifetime}`
+    *[false] {""}
+}
+infer_actual_impl_expl_but_actually_implemented_for_ty = ...but `{$trait_path}` is actually implemented for the type `{$ty}`{$has_lifetime ->
+    [true] , for some specific lifetime `'{$lifetime}`
+    *[false] {""}
+}
+infer_actual_impl_expl_but_actually_ty_implements = ...but `{$ty}` actually implements `{$trait_path}`{$has_lifetime ->
+    [true] , for some specific lifetime `'{$lifetime}`
+    *[false] {""}
+}
+
+infer_trait_placeholder_mismatch = implementation of `{$trait_def_id}` is not general enough
+    .label_satisfy = doesn't satisfy where-clause
+    .label_where = due to a where-clause on `{$def_id}`...
+    .label_dup = implementation of `{$trait_def_id}` is not general enough
+
+infer_trait_impl_diff = `impl` item signature doesn't match `trait` item signature
+    .found = found `{$found}`
+    .expected = expected `{$expected}`
+    .expected_found = expected signature `{$expected}`
+               {"   "}found signature `{$found}`
+
+infer_tid_rel_help = verify the lifetime relationships in the `trait` and `impl` between the `self` argument, the other inputs and its output
+infer_tid_consider_borrowing = consider borrowing this type parameter in the trait
+infer_tid_param_help = the lifetime requirements from the `impl` do not correspond to the requirements in the `trait`
+
+infer_dtcs_has_lifetime_req_label = this has an implicit `'static` lifetime requirement
+infer_dtcs_introduces_requirement = calling this method introduces the `impl`'s 'static` requirement
+infer_dtcs_has_req_note = the used `impl` has a `'static` requirement
+infer_dtcs_suggestion = consider relaxing the implicit `'static` requirement
+
+infer_but_calling_introduces = {$has_param_name ->
+    [true] `{$param_name}`
+    *[false] `fn` parameter
+} has {$lifetime_kind ->
+    [true] lifetime `{$lifetime}`
+    *[false] an anonymous lifetime `'_`
+} but calling `{$assoc_item}` introduces an implicit `'static` lifetime requirement
+    .label1 = {$has_lifetime ->
+        [true] lifetime `{$lifetime}`
+        *[false] an anonymous lifetime `'_`
+    }
+    .label2 = ...is used and required to live as long as `'static` here because of an implicit lifetime bound on the {$has_impl_path ->
+        [true] `impl` of `{$impl_path}`
+        *[false] inherent `impl`
+    }
+
+infer_but_needs_to_satisfy = {$has_param_name ->
+    [true] `{$param_name}`
+    *[false] `fn` parameter
+} has {$has_lifetime ->
+    [true] lifetime `{$lifetime}`
+    *[false] an anonymous lifetime `'_`
+} but it needs to satisfy a `'static` lifetime requirement
+    .influencer = this data with {$has_lifetime ->
+        [true] lifetime `{$lifetime}`
+        *[false] an anonymous lifetime `'_`
+    }...
+    .require = {$spans_empty ->
+        *[true] ...is used and required to live as long as `'static` here
+        [false] ...and is required to live as long as `'static` here
+    }
+    .used_here = ...is used here...
+    .introduced_by_bound = 'static` lifetime requirement introduced by this bound
+
+infer_more_targeted = {$has_param_name ->
+    [true] `{$param_name}`
+    *[false] `fn` parameter
+} has {$has_lifetime ->
+    [true] lifetime `{$lifetime}`
+    *[false] an anonymous lifetime `'_`
+} but calling `{$ident}` introduces an implicit `'static` lifetime requirement
+
+infer_ril_introduced_here = `'static` requirement introduced here
+infer_ril_introduced_by = requirement introduced by this return type
+infer_ril_because_of = because of this returned expression
+infer_ril_static_introduced_by = "`'static` lifetime requirement introduced by the return type
+
+infer_where_remove = remove the `where` clause
+infer_where_copy_predicates = copy the `where` clause predicates from the trait
+
+infer_srs_remove_and_box = consider removing this semicolon and boxing the expressions
+infer_srs_remove = consider removing this semicolon
+infer_srs_add = consider returning the local binding `{$ident}`
+infer_srs_add_one = consider returning one of these bindings
+
+infer_await_both_futures = consider `await`ing on both `Future`s
+infer_await_future = consider `await`ing on the `Future`
+infer_await_note = calling an async function returns a future
+
+infer_prlf_defined_with_sub = the lifetime `{$sub_symbol}` defined here...
+infer_prlf_defined_without_sub = the lifetime defined here...
+infer_prlf_must_oultive_with_sup = ...must outlive the lifetime `{$sup_symbol}` defined here
+infer_prlf_must_oultive_without_sup = ...must outlive the lifetime defined here
+infer_prlf_known_limitation = this is a known limitation that will be removed in the future (see issue #100013 <https://github.com/rust-lang/rust/issues/100013> for more information)
diff --git a/compiler/rustc_infer/src/errors/mod.rs b/compiler/rustc_infer/src/errors/mod.rs
index 0c2713fb1a7..7dccd0bb930 100644
--- a/compiler/rustc_infer/src/errors/mod.rs
+++ b/compiler/rustc_infer/src/errors/mod.rs
@@ -1,6 +1,6 @@
 use hir::GenericParamKind;
 use rustc_errors::{
-    fluent, AddToDiagnostic, Applicability, Diagnostic, DiagnosticMessage, DiagnosticStyledString,
+    AddToDiagnostic, Applicability, Diagnostic, DiagnosticMessage, DiagnosticStyledString,
     IntoDiagnosticArg, MultiSpan, SubdiagnosticMessage,
 };
 use rustc_hir as hir;
@@ -12,9 +12,10 @@ use rustc_span::symbol::kw;
 use rustc_span::Symbol;
 use rustc_span::{symbol::Ident, BytePos, Span};
 
-use crate::infer::error_reporting::nice_region_error::placeholder_error::Highlighted;
+use crate::fluent_generated as fluent;
 use crate::infer::error_reporting::{
     need_type_info::{GeneratorKindAsDiagArg, UnderspecifiedArgKind},
+    nice_region_error::placeholder_error::Highlighted,
     ObligationCauseAsDiagArg,
 };
 
@@ -26,9 +27,9 @@ pub struct OpaqueHiddenTypeDiag {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[note(opaque_type)]
+    #[note(infer_opaque_type)]
     pub opaque_type: Span,
-    #[note(hidden_type)]
+    #[note(infer_hidden_type)]
     pub hidden_type: Span,
 }
 
@@ -768,11 +769,11 @@ impl<'tcx> ActualImplExplNotes<'tcx> {
 pub struct TraitPlaceholderMismatch<'tcx> {
     #[primary_span]
     pub span: Span,
-    #[label(label_satisfy)]
+    #[label(infer_label_satisfy)]
     pub satisfy_span: Option<Span>,
-    #[label(label_where)]
+    #[label(infer_label_where)]
     pub where_span: Option<Span>,
-    #[label(label_dup)]
+    #[label(infer_label_dup)]
     pub dup_span: Option<Span>,
     pub def_id: String,
     pub trait_def_id: String,
@@ -808,11 +809,11 @@ pub struct RelationshipHelp;
 #[diag(infer_trait_impl_diff)]
 pub struct TraitImplDiff {
     #[primary_span]
-    #[label(found)]
+    #[label(infer_found)]
     pub sp: Span,
-    #[label(expected)]
+    #[label(infer_expected)]
     pub trait_sp: Span,
-    #[note(expected_found)]
+    #[note(infer_expected_found)]
     pub note: (),
     #[subdiagnostic]
     pub param_help: ConsiderBorrowingParamHelp,
@@ -852,10 +853,10 @@ impl AddToDiagnostic for DynTraitConstraintSuggestion {
 #[derive(Diagnostic)]
 #[diag(infer_but_calling_introduces, code = "E0772")]
 pub struct ButCallingIntroduces {
-    #[label(label1)]
+    #[label(infer_label1)]
     pub param_ty_span: Span,
     #[primary_span]
-    #[label(label2)]
+    #[label(infer_label2)]
     pub cause_span: Span,
 
     pub has_param_name: bool,
@@ -913,15 +914,15 @@ impl AddToDiagnostic for MoreTargeted {
 pub struct ButNeedsToSatisfy {
     #[primary_span]
     pub sp: Span,
-    #[label(influencer)]
+    #[label(infer_influencer)]
     pub influencer_point: Span,
-    #[label(used_here)]
+    #[label(infer_used_here)]
     pub spans: Vec<Span>,
-    #[label(require)]
+    #[label(infer_require)]
     pub require_span_as_label: Option<Span>,
-    #[note(require)]
+    #[note(infer_require)]
     pub require_span_as_note: Option<Span>,
-    #[note(introduced_by_bound)]
+    #[note(infer_introduced_by_bound)]
     pub bound: Option<Span>,
 
     #[subdiagnostic]
diff --git a/compiler/rustc_infer/src/errors/note_and_explain.rs b/compiler/rustc_infer/src/errors/note_and_explain.rs
index cb96aeec5f3..ef543b1fb93 100644
--- a/compiler/rustc_infer/src/errors/note_and_explain.rs
+++ b/compiler/rustc_infer/src/errors/note_and_explain.rs
@@ -1,7 +1,6 @@
+use crate::fluent_generated as fluent;
 use crate::infer::error_reporting::nice_region_error::find_anon_type;
-use rustc_errors::{
-    self, fluent, AddToDiagnostic, Diagnostic, IntoDiagnosticArg, SubdiagnosticMessage,
-};
+use rustc_errors::{self, AddToDiagnostic, Diagnostic, IntoDiagnosticArg, SubdiagnosticMessage};
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_span::{symbol::kw, Span};
 
diff --git a/compiler/rustc_infer/src/infer/error_reporting/note.rs b/compiler/rustc_infer/src/infer/error_reporting/note.rs
index e0e89158a58..7ffe1fd20b4 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/note.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/note.rs
@@ -2,10 +2,11 @@ use crate::errors::{
     note_and_explain, FullfillReqLifetime, LfBoundNotSatisfied, OutlivesBound, OutlivesContent,
     RefLongerThanData, RegionOriginNote, WhereClauseSuggestions,
 };
+use crate::fluent_generated as fluent;
 use crate::infer::error_reporting::{note_and_explain_region, TypeErrCtxt};
 use crate::infer::{self, SubregionOrigin};
 use rustc_errors::{
-    fluent, AddToDiagnostic, Diagnostic, DiagnosticBuilder, ErrorGuaranteed, IntoDiagnostic,
+    AddToDiagnostic, Diagnostic, DiagnosticBuilder, ErrorGuaranteed, IntoDiagnostic,
 };
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::traits::ObligationCauseCode;
diff --git a/compiler/rustc_infer/src/lib.rs b/compiler/rustc_infer/src/lib.rs
index 4c119a44355..b03ecb59750 100644
--- a/compiler/rustc_infer/src/lib.rs
+++ b/compiler/rustc_infer/src/lib.rs
@@ -33,6 +33,11 @@ extern crate tracing;
 #[macro_use]
 extern crate rustc_middle;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
 mod errors;
 pub mod infer;
 pub mod traits;
+
+fluent_messages! { "../locales/en-US.ftl" }
diff --git a/compiler/rustc_interface/locales/en-US.ftl b/compiler/rustc_interface/locales/en-US.ftl
new file mode 100644
index 00000000000..a7bc0e7af1f
--- /dev/null
+++ b/compiler/rustc_interface/locales/en-US.ftl
@@ -0,0 +1,56 @@
+interface_ferris_identifier =
+    Ferris cannot be used as an identifier
+    .suggestion = try using their name instead
+
+interface_emoji_identifier =
+    identifiers cannot contain emoji: `{$ident}`
+
+interface_mixed_bin_crate =
+    cannot mix `bin` crate type with others
+
+interface_mixed_proc_macro_crate =
+    cannot mix `proc-macro` crate type with others
+
+interface_proc_macro_doc_without_arg =
+    Trying to document proc macro crate without passing '--crate-type proc-macro to rustdoc
+    .warn = The generated documentation may be incorrect
+
+interface_error_writing_dependencies =
+    error writing dependencies to `{$path}`: {$error}
+
+interface_input_file_would_be_overwritten =
+    the input file "{$path}" would be overwritten by the generated executable
+
+interface_generated_file_conflicts_with_directory =
+    the generated executable for the input file "{$input_path}" conflicts with the existing directory "{$dir_path}"
+
+interface_temps_dir_error =
+    failed to find or create the directory specified by `--temps-dir`
+
+interface_out_dir_error =
+    failed to find or create the directory specified by `--out-dir`
+
+interface_cant_emit_mir =
+    could not emit MIR: {$error}
+
+interface_rustc_error_fatal =
+    fatal error triggered by #[rustc_error]
+
+interface_rustc_error_unexpected_annotation =
+    unexpected annotation used with `#[rustc_error(...)]!
+
+interface_failed_writing_file =
+    failed to write file {$path}: {$error}"
+
+interface_proc_macro_crate_panic_abort =
+    building proc macro crate with `panic=abort` may crash the compiler should the proc-macro panic
+
+interface_unsupported_crate_type_for_target =
+    dropping unsupported crate type `{$crate_type}` for target `{$target_triple}`
+
+interface_multiple_output_types_adaption =
+    due to multiple output types requested, the explicitly specified output file name will be adapted for each output type
+
+interface_ignoring_extra_filename = ignoring -C extra-filename flag due to -o flag
+
+interface_ignoring_out_dir = ignoring --out-dir flag due to -o flag
diff --git a/compiler/rustc_interface/src/interface.rs b/compiler/rustc_interface/src/interface.rs
index d504aea77d0..5e38ca034ac 100644
--- a/compiler/rustc_interface/src/interface.rs
+++ b/compiler/rustc_interface/src/interface.rs
@@ -222,6 +222,7 @@ pub struct Config {
     pub output_dir: Option<PathBuf>,
     pub output_file: Option<PathBuf>,
     pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
+    pub locale_resources: &'static [&'static str],
 
     pub lint_caps: FxHashMap<lint::LintId, lint::Level>,
 
@@ -267,6 +268,7 @@ pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Se
                 config.opts,
                 config.crate_cfg,
                 config.crate_check_cfg,
+                config.locale_resources,
                 config.file_loader,
                 CompilerIO {
                     input: config.input,
diff --git a/compiler/rustc_interface/src/lib.rs b/compiler/rustc_interface/src/lib.rs
index 82bc4770b6b..1abbe8d4fab 100644
--- a/compiler/rustc_interface/src/lib.rs
+++ b/compiler/rustc_interface/src/lib.rs
@@ -12,6 +12,9 @@
 #[macro_use]
 extern crate tracing;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
 mod callbacks;
 mod errors;
 pub mod interface;
@@ -27,3 +30,5 @@ pub use queries::Queries;
 
 #[cfg(test)]
 mod tests;
+
+fluent_messages! { "../locales/en-US.ftl" }
diff --git a/compiler/rustc_interface/src/tests.rs b/compiler/rustc_interface/src/tests.rs
index bfb1e822a26..8ef1df39933 100644
--- a/compiler/rustc_interface/src/tests.rs
+++ b/compiler/rustc_interface/src/tests.rs
@@ -50,7 +50,7 @@ fn mk_session(matches: getopts::Matches) -> (Session, CfgSpecs) {
         output_file: None,
         temps_dir,
     };
-    let sess = build_session(sessopts, io, None, registry, Default::default(), None, None);
+    let sess = build_session(sessopts, io, None, registry, &[], Default::default(), None, None);
     (sess, cfg)
 }
 
diff --git a/compiler/rustc_interface/src/util.rs b/compiler/rustc_interface/src/util.rs
index 475d3601b52..20ba5c6eb2d 100644
--- a/compiler/rustc_interface/src/util.rs
+++ b/compiler/rustc_interface/src/util.rs
@@ -59,6 +59,7 @@ pub fn create_session(
     sopts: config::Options,
     cfg: FxHashSet<(String, Option<String>)>,
     check_cfg: CheckCfg,
+    locale_resources: &'static [&'static str],
     file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
     io: CompilerIO,
     lint_caps: FxHashMap<lint::LintId, lint::Level>,
@@ -94,6 +95,7 @@ pub fn create_session(
         io,
         bundle,
         descriptions,
+        locale_resources,
         lint_caps,
         file_loader,
         target_override,
diff --git a/compiler/rustc_lint/locales/en-US.ftl b/compiler/rustc_lint/locales/en-US.ftl
new file mode 100644
index 00000000000..b1e7cc69a80
--- /dev/null
+++ b/compiler/rustc_lint/locales/en-US.ftl
@@ -0,0 +1,503 @@
+lint_array_into_iter =
+    this method call resolves to `<&{$target} as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <{$target} as IntoIterator>::into_iter in Rust 2021
+    .use_iter_suggestion = use `.iter()` instead of `.into_iter()` to avoid ambiguity
+    .remove_into_iter_suggestion = or remove `.into_iter()` to iterate by value
+    .use_explicit_into_iter_suggestion =
+        or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
+
+lint_enum_intrinsics_mem_discriminant =
+    the return value of `mem::discriminant` is unspecified when called with a non-enum type
+    .note = the argument to `discriminant` should be a reference to an enum, but it was passed a reference to a `{$ty_param}`, which is not an enum.
+
+lint_enum_intrinsics_mem_variant =
+    the return value of `mem::variant_count` is unspecified when called with a non-enum type
+    .note = the type parameter of `variant_count` should be an enum, but it was instantiated with the type `{$ty_param}`, which is not an enum.
+
+lint_expectation = this lint expectation is unfulfilled
+    .note = the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message
+    .rationale = {$rationale}
+
+lint_for_loops_over_fallibles =
+    for loop over {$article} `{$ty}`. This is more readably written as an `if let` statement
+    .suggestion = consider using `if let` to clear intent
+    .remove_next = to iterate over `{$recv_snip}` remove the call to `next`
+    .use_while_let = to check pattern in a loop use `while let`
+    .use_question_mark = consider unwrapping the `Result` with `?` to iterate over its contents
+
+lint_non_binding_let_on_sync_lock =
+    non-binding let on a synchronization lock
+
+lint_non_binding_let_on_drop_type =
+    non-binding let on a type that implements `Drop`
+
+lint_non_binding_let_suggestion =
+    consider binding to an unused variable to avoid immediately dropping the value
+
+lint_non_binding_let_multi_suggestion =
+    consider immediately dropping the value
+
+lint_deprecated_lint_name =
+    lint name `{$name}` is deprecated and may not have an effect in the future.
+    .suggestion = change it to
+
+lint_renamed_or_removed_lint = {$msg}
+    .suggestion = use the new name
+
+lint_unknown_lint =
+    unknown lint: `{$name}`
+    .suggestion = did you mean
+
+lint_ignored_unless_crate_specified = {$level}({$name}) is ignored unless specified at crate level
+
+lint_unknown_gated_lint =
+    unknown lint: `{$name}`
+    .note = the `{$name}` lint is unstable
+
+lint_hidden_unicode_codepoints = unicode codepoint changing visible direction of text present in {$label}
+    .label = this {$label} contains {$count ->
+        [one] an invisible
+        *[other] invisible
+    } unicode text flow control {$count ->
+        [one] codepoint
+        *[other] codepoints
+    }
+    .note = these kind of unicode codepoints change the way text flows on applications that support them, but can cause confusion because they change the order of characters on the screen
+    .suggestion_remove = if their presence wasn't intentional, you can remove them
+    .suggestion_escape = if you want to keep them but make them visible in your source code, you can escape them
+    .no_suggestion_note_escape = if you want to keep them but make them visible in your source code, you can escape them: {$escaped}
+
+lint_default_hash_types = prefer `{$preferred}` over `{$used}`, it has better performance
+    .note = a `use rustc_data_structures::fx::{$preferred}` may be necessary
+
+lint_query_instability = using `{$query}` can result in unstable query results
+    .note = if you believe this case to be fine, allow this lint and add a comment explaining your rationale
+
+lint_tykind_kind = usage of `ty::TyKind::<kind>`
+    .suggestion = try using `ty::<kind>` directly
+
+lint_tykind = usage of `ty::TyKind`
+    .help = try using `Ty` instead
+
+lint_ty_qualified = usage of qualified `ty::{$ty}`
+    .suggestion = try importing it and using it unqualified
+
+lint_lintpass_by_hand = implementing `LintPass` by hand
+    .help = try using `declare_lint_pass!` or `impl_lint_pass!` instead
+
+lint_non_existant_doc_keyword = found non-existing keyword `{$keyword}` used in `#[doc(keyword = \"...\")]`
+    .help = only existing keywords are allowed in core/std
+
+lint_diag_out_of_impl =
+    diagnostics should only be created in `IntoDiagnostic`/`AddToDiagnostic` impls
+
+lint_untranslatable_diag = diagnostics should be created using translatable messages
+
+lint_bad_opt_access = {$msg}
+
+lint_cstring_ptr = getting the inner pointer of a temporary `CString`
+    .as_ptr_label = this pointer will be invalid
+    .unwrap_label = this `CString` is deallocated at the end of the statement, bind it to a variable to extend its lifetime
+    .note = pointers do not have a lifetime; when calling `as_ptr` the `CString` will be deallocated at the end of the statement because nothing is referencing it as far as the type system is concerned
+    .help = for more information, see https://doc.rust-lang.org/reference/destructors.html
+
+lint_multple_supertrait_upcastable = `{$ident}` is object-safe and has multiple supertraits
+
+lint_identifier_non_ascii_char = identifier contains non-ASCII characters
+
+lint_identifier_uncommon_codepoints = identifier contains uncommon Unicode codepoints
+
+lint_confusable_identifier_pair = identifier pair considered confusable between `{$existing_sym}` and `{$sym}`
+    .label = this is where the previous identifier occurred
+
+lint_mixed_script_confusables =
+    the usage of Script Group `{$set}` in this crate consists solely of mixed script confusables
+    .includes_note = the usage includes {$includes}
+    .note = please recheck to make sure their usages are indeed what you want
+
+lint_non_fmt_panic = panic message is not a string literal
+    .note = this usage of `{$name}!()` is deprecated; it will be a hard error in Rust 2021
+    .more_info_note = for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
+    .supports_fmt_note = the `{$name}!()` macro supports formatting, so there's no need for the `format!()` macro here
+    .supports_fmt_suggestion = remove the `format!(..)` macro call
+    .display_suggestion = add a "{"{"}{"}"}" format string to `Display` the message
+    .debug_suggestion =
+        add a "{"{"}:?{"}"}" format string to use the `Debug` implementation of `{$ty}`
+    .panic_suggestion = {$already_suggested ->
+        [true] or use
+        *[false] use
+    } std::panic::panic_any instead
+
+lint_non_fmt_panic_unused =
+    panic message contains {$count ->
+        [one] an unused
+        *[other] unused
+    } formatting {$count ->
+        [one] placeholder
+        *[other] placeholders
+    }
+    .note = this message is not used as a format string when given without arguments, but will be in Rust 2021
+    .add_args_suggestion = add the missing {$count ->
+        [one] argument
+        *[other] arguments
+    }
+    .add_fmt_suggestion = or add a "{"{"}{"}"}" format string to use the message literally
+
+lint_non_fmt_panic_braces =
+    panic message contains {$count ->
+        [one] a brace
+        *[other] braces
+    }
+    .note = this message is not used as a format string, but will be in Rust 2021
+    .suggestion = add a "{"{"}{"}"}" format string to use the message literally
+
+lint_non_camel_case_type = {$sort} `{$name}` should have an upper camel case name
+    .suggestion = convert the identifier to upper camel case
+    .label = should have an UpperCamelCase name
+
+lint_non_snake_case = {$sort} `{$name}` should have a snake case name
+    .rename_or_convert_suggestion = rename the identifier or convert it to a snake case raw identifier
+    .cannot_convert_note = `{$sc}` cannot be used as a raw identifier
+    .rename_suggestion = rename the identifier
+    .convert_suggestion = convert the identifier to snake case
+    .help = convert the identifier to snake case: `{$sc}`
+    .label = should have a snake_case name
+
+lint_non_upper_case_global = {$sort} `{$name}` should have an upper case name
+    .suggestion = convert the identifier to upper case
+    .label = should have an UPPER_CASE name
+
+lint_noop_method_call = call to `.{$method}()` on a reference in this situation does nothing
+    .label = unnecessary method call
+    .note = the type `{$receiver_ty}` which `{$method}` is being called on is the same as the type returned from `{$method}`, so the method call does not do anything and can be removed
+
+lint_pass_by_value = passing `{$ty}` by reference
+    .suggestion = try passing by value
+
+lint_redundant_semicolons =
+    unnecessary trailing {$multiple ->
+        [true] semicolons
+        *[false] semicolon
+    }
+    .suggestion = remove {$multiple ->
+        [true] these semicolons
+        *[false] this semicolon
+    }
+
+lint_drop_trait_constraints =
+    bounds on `{$predicate}` are most likely incorrect, consider instead using `{$needs_drop}` to detect whether a type can be trivially dropped
+
+lint_drop_glue =
+    types that do not implement `Drop` can still have drop glue, consider instead using `{$needs_drop}` to detect whether a type is trivially dropped
+
+lint_range_endpoint_out_of_range = range endpoint is out of range for `{$ty}`
+    .suggestion = use an inclusive range instead
+
+lint_overflowing_bin_hex = literal out of range for `{$ty}`
+    .negative_note = the literal `{$lit}` (decimal `{$dec}`) does not fit into the type `{$ty}`
+    .negative_becomes_note = and the value `-{$lit}` will become `{$actually}{$ty}`
+    .positive_note = the literal `{$lit}` (decimal `{$dec}`) does not fit into the type `{$ty}` and will become `{$actually}{$ty}`
+    .suggestion = consider using the type `{$suggestion_ty}` instead
+    .help = consider using the type `{$suggestion_ty}` instead
+
+lint_overflowing_int = literal out of range for `{$ty}`
+    .note = the literal `{$lit}` does not fit into the type `{$ty}` whose range is `{$min}..={$max}`
+    .help = consider using the type `{$suggestion_ty}` instead
+
+lint_only_cast_u8_to_char = only `u8` can be cast into `char`
+    .suggestion = use a `char` literal instead
+
+lint_overflowing_uint = literal out of range for `{$ty}`
+    .note = the literal `{$lit}` does not fit into the type `{$ty}` whose range is `{$min}..={$max}`
+
+lint_overflowing_literal = literal out of range for `{$ty}`
+    .note = the literal `{$lit}` does not fit into the type `{$ty}` and will be converted to `{$ty}::INFINITY`
+
+lint_unused_comparisons = comparison is useless due to type limits
+
+lint_improper_ctypes = `extern` {$desc} uses type `{$ty}`, which is not FFI-safe
+    .label = not FFI-safe
+    .note = the type is defined here
+
+lint_improper_ctypes_opaque = opaque types have no C equivalent
+
+lint_improper_ctypes_fnptr_reason = this function pointer has Rust-specific calling convention
+lint_improper_ctypes_fnptr_help = consider using an `extern fn(...) -> ...` function pointer instead
+
+lint_improper_ctypes_tuple_reason = tuples have unspecified layout
+lint_improper_ctypes_tuple_help = consider using a struct instead
+
+lint_improper_ctypes_str_reason = string slices have no C equivalent
+lint_improper_ctypes_str_help = consider using `*const u8` and a length instead
+
+lint_improper_ctypes_dyn = trait objects have no C equivalent
+
+lint_improper_ctypes_slice_reason = slices have no C equivalent
+lint_improper_ctypes_slice_help = consider using a raw pointer instead
+
+lint_improper_ctypes_128bit = 128-bit integers don't currently have a known stable ABI
+
+lint_improper_ctypes_char_reason = the `char` type has no C equivalent
+lint_improper_ctypes_char_help = consider using `u32` or `libc::wchar_t` instead
+
+lint_improper_ctypes_non_exhaustive = this enum is non-exhaustive
+lint_improper_ctypes_non_exhaustive_variant = this enum has non-exhaustive variants
+
+lint_improper_ctypes_enum_repr_reason = enum has no representation hint
+lint_improper_ctypes_enum_repr_help =
+    consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
+
+lint_improper_ctypes_struct_fieldless_reason = this struct has no fields
+lint_improper_ctypes_struct_fieldless_help = consider adding a member to this struct
+
+lint_improper_ctypes_union_fieldless_reason = this union has no fields
+lint_improper_ctypes_union_fieldless_help = consider adding a member to this union
+
+lint_improper_ctypes_struct_non_exhaustive = this struct is non-exhaustive
+lint_improper_ctypes_union_non_exhaustive = this union is non-exhaustive
+
+lint_improper_ctypes_struct_layout_reason = this struct has unspecified layout
+lint_improper_ctypes_struct_layout_help = consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
+
+lint_improper_ctypes_union_layout_reason = this union has unspecified layout
+lint_improper_ctypes_union_layout_help = consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this union
+
+lint_improper_ctypes_box = box cannot be represented as a single pointer
+
+lint_improper_ctypes_enum_phantomdata = this enum contains a PhantomData field
+
+lint_improper_ctypes_struct_zst = this struct contains only zero-sized fields
+
+lint_improper_ctypes_array_reason = passing raw arrays by value is not FFI-safe
+lint_improper_ctypes_array_help = consider passing a pointer to the array
+
+lint_improper_ctypes_only_phantomdata = composed only of `PhantomData`
+
+lint_variant_size_differences =
+    enum variant is more than three times larger ({$largest} bytes) than the next largest
+
+lint_atomic_ordering_load = atomic loads cannot have `Release` or `AcqRel` ordering
+    .help = consider using ordering modes `Acquire`, `SeqCst` or `Relaxed`
+
+lint_atomic_ordering_store = atomic stores cannot have `Acquire` or `AcqRel` ordering
+    .help = consider using ordering modes `Release`, `SeqCst` or `Relaxed`
+
+lint_atomic_ordering_fence = memory fences cannot have `Relaxed` ordering
+    .help = consider using ordering modes `Acquire`, `Release`, `AcqRel` or `SeqCst`
+
+lint_atomic_ordering_invalid = `{$method}`'s failure ordering may not be `Release` or `AcqRel`, since a failed `{$method}` does not result in a write
+    .label = invalid failure ordering
+    .help = consider using `Acquire` or `Relaxed` failure ordering instead
+
+lint_unused_op = unused {$op} that must be used
+    .label = the {$op} produces a value
+    .suggestion = use `let _ = ...` to ignore the resulting value
+
+lint_unused_result = unused result of type `{$ty}`
+
+lint_unused_closure =
+    unused {$pre}{$count ->
+        [one] closure
+        *[other] closures
+    }{$post} that must be used
+    .note = closures are lazy and do nothing unless called
+
+lint_unused_generator =
+    unused {$pre}{$count ->
+        [one] generator
+        *[other] generator
+    }{$post} that must be used
+    .note = generators are lazy and do nothing unless resumed
+
+lint_unused_def = unused {$pre}`{$def}`{$post} that must be used
+    .suggestion = use `let _ = ...` to ignore the resulting value
+
+lint_path_statement_drop = path statement drops value
+    .suggestion = use `drop` to clarify the intent
+
+lint_path_statement_no_effect = path statement with no effect
+
+lint_unused_delim = unnecessary {$delim} around {$item}
+    .suggestion = remove these {$delim}
+
+lint_unused_import_braces = braces around {$node} is unnecessary
+
+lint_unused_allocation = unnecessary allocation, use `&` instead
+lint_unused_allocation_mut = unnecessary allocation, use `&mut` instead
+
+lint_builtin_while_true = denote infinite loops with `loop {"{"} ... {"}"}`
+    .suggestion = use `loop`
+
+lint_builtin_box_pointers = type uses owned (Box type) pointers: {$ty}
+
+lint_builtin_non_shorthand_field_patterns = the `{$ident}:` in this pattern is redundant
+    .suggestion = use shorthand field pattern
+
+lint_builtin_overridden_symbol_name =
+    the linker's behavior with multiple libraries exporting duplicate symbol names is undefined and Rust cannot provide guarantees when you manually override them
+
+lint_builtin_overridden_symbol_section =
+    the program's behavior with overridden link sections on items is unpredictable and Rust cannot provide guarantees when you manually override them
+
+lint_builtin_allow_internal_unsafe =
+    `allow_internal_unsafe` allows defining macros using unsafe without triggering the `unsafe_code` lint at their call site
+
+lint_builtin_unsafe_block = usage of an `unsafe` block
+
+lint_builtin_unsafe_trait = declaration of an `unsafe` trait
+
+lint_builtin_unsafe_impl = implementation of an `unsafe` trait
+
+lint_builtin_no_mangle_fn = declaration of a `no_mangle` function
+lint_builtin_export_name_fn = declaration of a function with `export_name`
+lint_builtin_link_section_fn = declaration of a function with `link_section`
+
+lint_builtin_no_mangle_static = declaration of a `no_mangle` static
+lint_builtin_export_name_static = declaration of a static with `export_name`
+lint_builtin_link_section_static = declaration of a static with `link_section`
+
+lint_builtin_no_mangle_method = declaration of a `no_mangle` method
+lint_builtin_export_name_method = declaration of a method with `export_name`
+
+lint_builtin_decl_unsafe_fn = declaration of an `unsafe` function
+lint_builtin_decl_unsafe_method = declaration of an `unsafe` method
+lint_builtin_impl_unsafe_method = implementation of an `unsafe` method
+
+lint_builtin_missing_doc = missing documentation for {$article} {$desc}
+
+lint_builtin_missing_copy_impl = type could implement `Copy`; consider adding `impl Copy`
+
+lint_builtin_missing_debug_impl =
+    type does not implement `{$debug}`; consider adding `#[derive(Debug)]` or a manual implementation
+
+lint_builtin_anonymous_params = anonymous parameters are deprecated and will be removed in the next edition
+    .suggestion = try naming the parameter or explicitly ignoring it
+
+lint_builtin_deprecated_attr_link = use of deprecated attribute `{$name}`: {$reason}. See {$link}
+    .msg_suggestion = {$msg}
+    .default_suggestion = remove this attribute
+lint_builtin_deprecated_attr_used = use of deprecated attribute `{$name}`: no longer used.
+lint_builtin_deprecated_attr_default_suggestion = remove this attribute
+
+lint_builtin_unused_doc_comment = unused doc comment
+    .label = rustdoc does not generate documentation for {$kind}
+    .plain_help = use `//` for a plain comment
+    .block_help = use `/* */` for a plain comment
+
+lint_builtin_no_mangle_generic = functions generic over types or consts must be mangled
+    .suggestion = remove this attribute
+
+lint_builtin_const_no_mangle = const items should never be `#[no_mangle]`
+    .suggestion = try a static value
+
+lint_builtin_mutable_transmutes =
+    transmuting &T to &mut T is undefined behavior, even if the reference is unused, consider instead using an UnsafeCell
+
+lint_builtin_unstable_features = unstable feature
+
+lint_ungated_async_fn_track_caller = `#[track_caller]` on async functions is a no-op
+     .label = this function will not propagate the caller location
+
+lint_builtin_unreachable_pub = unreachable `pub` {$what}
+    .suggestion = consider restricting its visibility
+    .help = or consider exporting it for use by other crates
+
+lint_builtin_unexpected_cli_config_name = unexpected `{$name}` as condition name
+    .help = was set with `--cfg` but isn't in the `--check-cfg` expected names
+
+lint_builtin_unexpected_cli_config_value = unexpected condition value `{$value}` for condition name `{$name}`
+    .help = was set with `--cfg` but isn't in the `--check-cfg` expected values
+
+lint_builtin_type_alias_bounds_help = use fully disambiguated paths (i.e., `<T as Trait>::Assoc`) to refer to associated types in type aliases
+
+lint_builtin_type_alias_where_clause = where clauses are not enforced in type aliases
+    .suggestion = the clause will not be checked when the type alias is used, and should be removed
+
+lint_builtin_type_alias_generic_bounds = bounds on generic parameters are not enforced in type aliases
+    .suggestion = the bound will not be checked when the type alias is used, and should be removed
+
+lint_builtin_trivial_bounds = {$predicate_kind_name} bound {$predicate} does not depend on any type or lifetime parameters
+
+lint_builtin_ellipsis_inclusive_range_patterns = `...` range patterns are deprecated
+    .suggestion = use `..=` for an inclusive range
+
+lint_builtin_unnameable_test_items = cannot test inner items
+
+lint_builtin_keyword_idents = `{$kw}` is a keyword in the {$next} edition
+    .suggestion = you can use a raw identifier to stay compatible
+
+lint_builtin_explicit_outlives = outlives requirements can be inferred
+    .suggestion = remove {$count ->
+        [one] this bound
+        *[other] these bounds
+    }
+
+lint_builtin_incomplete_features = the feature `{$name}` is incomplete and may not be safe to use and/or cause compiler crashes
+    .note = see issue #{$n} <https://github.com/rust-lang/rust/issues/{$n}> for more information
+    .help = consider using `min_{$name}` instead, which is more stable and complete
+
+lint_builtin_unpermitted_type_init_zeroed = the type `{$ty}` does not permit zero-initialization
+lint_builtin_unpermitted_type_init_unint = the type `{$ty}` does not permit being left uninitialized
+
+lint_builtin_unpermitted_type_init_label = this code causes undefined behavior when executed
+lint_builtin_unpermitted_type_init_label_suggestion = help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
+
+lint_builtin_clashing_extern_same_name = `{$this}` redeclared with a different signature
+    .previous_decl_label = `{$orig}` previously declared here
+    .mismatch_label = this signature doesn't match the previous declaration
+lint_builtin_clashing_extern_diff_name = `{$this}` redeclares `{$orig}` with a different signature
+    .previous_decl_label = `{$orig}` previously declared here
+    .mismatch_label = this signature doesn't match the previous declaration
+
+lint_builtin_deref_nullptr = dereferencing a null pointer
+    .label = this code causes undefined behavior when executed
+
+lint_builtin_asm_labels = avoid using named labels in inline assembly
+
+lint_builtin_special_module_name_used_lib = found module declaration for lib.rs
+    .note = lib.rs is the root of this crate's library target
+    .help = to refer to it from other targets, use the library's name as the path
+
+lint_builtin_special_module_name_used_main = found module declaration for main.rs
+    .note = a binary crate cannot be used as library
+
+lint_supertrait_as_deref_target = `{$t}` implements `Deref` with supertrait `{$target_principal}` as target
+    .label = target type is set here
+
+lint_overruled_attribute = {$lint_level}({$lint_source}) incompatible with previous forbid
+    .label = overruled by previous forbid
+
+lint_default_source = `forbid` lint level is the default for {$id}
+
+lint_node_source = `forbid` level set here
+    .note = {$reason}
+
+lint_command_line_source = `forbid` lint level was set on command line
+
+lint_malformed_attribute = malformed lint attribute input
+
+lint_bad_attribute_argument = bad attribute argument
+
+lint_reason_must_be_string_literal = reason must be a string literal
+
+lint_reason_must_come_last = reason in lint attribute must come last
+
+lint_unknown_tool_in_scoped_lint = unknown tool name `{$tool_name}` found in scoped lint: `{$tool_name}::{$lint_name}`
+    .help = add `#![register_tool({$tool_name})]` to the crate root
+
+lint_unsupported_group = `{$lint_group}` lint group is not supported with ´--force-warn´
+
+lint_requested_level = requested on the command line with `{$level} {$lint_name}`
+
+lint_check_name_unknown = unknown lint: `{$lint_name}`
+    .help = did you mean: `{$suggestion}`
+
+lint_check_name_unknown_tool = unknown lint tool: `{$tool_name}`
+
+lint_check_name_warning = {$msg}
+
+lint_check_name_deprecated = lint name `{$lint_name}` is deprecated and does not have an effect anymore. Use: {$new_name}
+
+lint_opaque_hidden_inferred_bound = opaque type `{$ty}` does not satisfy its associated type bounds
+    .specifically = this associated type bound is unsatisfied for `{$proj_ty}`
+
+lint_opaque_hidden_inferred_bound_sugg = add this bound
diff --git a/compiler/rustc_lint/src/array_into_iter.rs b/compiler/rustc_lint/src/array_into_iter.rs
index 3593f141df6..bccb0a94e98 100644
--- a/compiler/rustc_lint/src/array_into_iter.rs
+++ b/compiler/rustc_lint/src/array_into_iter.rs
@@ -1,5 +1,7 @@
-use crate::lints::{ArrayIntoIterDiag, ArrayIntoIterDiagSub};
-use crate::{LateContext, LateLintPass, LintContext};
+use crate::{
+    lints::{ArrayIntoIterDiag, ArrayIntoIterDiagSub},
+    LateContext, LateLintPass, LintContext,
+};
 use rustc_hir as hir;
 use rustc_middle::ty;
 use rustc_middle::ty::adjustment::{Adjust, Adjustment};
diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
index 726042479e9..5e90669d33a 100644
--- a/compiler/rustc_lint/src/builtin.rs
+++ b/compiler/rustc_lint/src/builtin.rs
@@ -20,6 +20,7 @@
 //! If you define a new `LateLintPass`, you will also need to add it to the
 //! `late_lint_methods!` invocation in `lib.rs`.
 
+use crate::fluent_generated as fluent;
 use crate::{
     errors::BuiltinEllpisisInclusiveRangePatterns,
     lints::{
@@ -50,7 +51,7 @@ use rustc_ast::{self as ast, *};
 use rustc_ast_pretty::pprust::{self, expr_to_string};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::stack::ensure_sufficient_stack;
-use rustc_errors::{fluent, Applicability, DecorateLint, MultiSpan};
+use rustc_errors::{Applicability, DecorateLint, MultiSpan};
 use rustc_feature::{deprecated_attributes, AttributeGate, BuiltinAttribute, GateIssue, Stability};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
diff --git a/compiler/rustc_lint/src/errors.rs b/compiler/rustc_lint/src/errors.rs
index f3ae2609186..9af5284df1e 100644
--- a/compiler/rustc_lint/src/errors.rs
+++ b/compiler/rustc_lint/src/errors.rs
@@ -1,6 +1,6 @@
+use crate::fluent_generated as fluent;
 use rustc_errors::{
-    fluent, AddToDiagnostic, Diagnostic, ErrorGuaranteed, Handler, IntoDiagnostic,
-    SubdiagnosticMessage,
+    AddToDiagnostic, Diagnostic, ErrorGuaranteed, Handler, IntoDiagnostic, SubdiagnosticMessage,
 };
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_session::lint::Level;
@@ -116,7 +116,7 @@ impl IntoDiagnostic<'_> for CheckNameUnknown {
         let mut diag = handler.struct_err(fluent::lint_check_name_unknown);
         diag.code(rustc_errors::error_code!(E0602));
         if let Some(suggestion) = self.suggestion {
-            diag.help(fluent::help);
+            diag.help(fluent::lint_help);
             diag.set_arg("suggestion", suggestion);
         }
         diag.set_arg("lint_name", self.lint_name);
diff --git a/compiler/rustc_lint/src/levels.rs b/compiler/rustc_lint/src/levels.rs
index cca36913dea..bc7488fab4a 100644
--- a/compiler/rustc_lint/src/levels.rs
+++ b/compiler/rustc_lint/src/levels.rs
@@ -1,13 +1,16 @@
-use crate::context::{CheckLintNameResult, LintStore};
-use crate::late::unerased_lint_store;
-use crate::lints::{
-    DeprecatedLintName, IgnoredUnlessCrateSpecified, OverruledAtributeLint, RenamedOrRemovedLint,
-    RenamedOrRemovedLintSuggestion, UnknownLint, UnknownLintSuggestion,
+use crate::{
+    context::{CheckLintNameResult, LintStore},
+    fluent_generated as fluent,
+    late::unerased_lint_store,
+    lints::{
+        DeprecatedLintName, IgnoredUnlessCrateSpecified, OverruledAtributeLint,
+        RenamedOrRemovedLint, RenamedOrRemovedLintSuggestion, UnknownLint, UnknownLintSuggestion,
+    },
 };
 use rustc_ast as ast;
 use rustc_ast_pretty::pprust;
 use rustc_data_structures::fx::FxHashMap;
-use rustc_errors::{fluent, DecorateLint, DiagnosticBuilder, DiagnosticMessage, MultiSpan};
+use rustc_errors::{DecorateLint, DiagnosticBuilder, DiagnosticMessage, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::HirId;
@@ -983,7 +986,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
                     fluent::lint_unknown_gated_lint,
                     |lint| {
                         lint.set_arg("name", lint_id.lint.name_lower());
-                        lint.note(fluent::note);
+                        lint.note(fluent::lint_note);
                         add_feature_diagnostics(lint, &self.sess.parse_sess, feature);
                         lint
                     },
diff --git a/compiler/rustc_lint/src/lib.rs b/compiler/rustc_lint/src/lib.rs
index 4ca37ef6850..2070ffea4d9 100644
--- a/compiler/rustc_lint/src/lib.rs
+++ b/compiler/rustc_lint/src/lib.rs
@@ -80,8 +80,10 @@ mod unused;
 pub use array_into_iter::ARRAY_INTO_ITER;
 
 use rustc_ast as ast;
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_hir as hir;
 use rustc_hir::def_id::LocalDefId;
+use rustc_macros::fluent_messages;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::lint::builtin::{
@@ -122,6 +124,8 @@ pub use rustc_session::lint::Level::{self, *};
 pub use rustc_session::lint::{BufferedEarlyLint, FutureIncompatibleInfo, Lint, LintId};
 pub use rustc_session::lint::{LintArray, LintPass};
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 pub fn provide(providers: &mut Providers) {
     levels::provide(providers);
     expect::provide(providers);
diff --git a/compiler/rustc_lint/src/lints.rs b/compiler/rustc_lint/src/lints.rs
index aa6e230dc6d..2d9aa9074be 100644
--- a/compiler/rustc_lint/src/lints.rs
+++ b/compiler/rustc_lint/src/lints.rs
@@ -2,9 +2,10 @@
 #![allow(rustc::diagnostic_outside_of_impl)]
 use std::num::NonZeroU32;
 
+use crate::fluent_generated as fluent;
 use rustc_errors::{
-    fluent, AddToDiagnostic, Applicability, DecorateLint, DiagnosticMessage,
-    DiagnosticStyledString, SuggestionStyle,
+    AddToDiagnostic, Applicability, DecorateLint, DiagnosticMessage, DiagnosticStyledString,
+    SuggestionStyle,
 };
 use rustc_hir::def_id::DefId;
 use rustc_macros::{LintDiagnostic, Subdiagnostic};
@@ -23,7 +24,7 @@ use crate::{
 #[diag(lint_array_into_iter)]
 pub struct ArrayIntoIterDiag<'a> {
     pub target: &'a str,
-    #[suggestion(use_iter_suggestion, code = "iter", applicability = "machine-applicable")]
+    #[suggestion(lint_use_iter_suggestion, code = "iter", applicability = "machine-applicable")]
     pub suggestion: Span,
     #[subdiagnostic]
     pub sub: Option<ArrayIntoIterDiagSub>,
@@ -31,12 +32,15 @@ pub struct ArrayIntoIterDiag<'a> {
 
 #[derive(Subdiagnostic)]
 pub enum ArrayIntoIterDiagSub {
-    #[suggestion(remove_into_iter_suggestion, code = "", applicability = "maybe-incorrect")]
+    #[suggestion(lint_remove_into_iter_suggestion, code = "", applicability = "maybe-incorrect")]
     RemoveIntoIter {
         #[primary_span]
         span: Span,
     },
-    #[multipart_suggestion(use_explicit_into_iter_suggestion, applicability = "maybe-incorrect")]
+    #[multipart_suggestion(
+        lint_use_explicit_into_iter_suggestion,
+        applicability = "maybe-incorrect"
+    )]
     UseExplicitIntoIter {
         #[suggestion_part(code = "IntoIterator::into_iter(")]
         start_span: Span,
@@ -163,13 +167,13 @@ pub struct BuiltinDeprecatedAttrLink<'a> {
 
 #[derive(Subdiagnostic)]
 pub enum BuiltinDeprecatedAttrLinkSuggestion<'a> {
-    #[suggestion(msg_suggestion, code = "", applicability = "machine-applicable")]
+    #[suggestion(lint_msg_suggestion, code = "", applicability = "machine-applicable")]
     Msg {
         #[primary_span]
         suggestion: Span,
         msg: &'a str,
     },
-    #[suggestion(default_suggestion, code = "", applicability = "machine-applicable")]
+    #[suggestion(lint_default_suggestion, code = "", applicability = "machine-applicable")]
     Default {
         #[primary_span]
         suggestion: Span,
@@ -201,9 +205,9 @@ pub struct BuiltinUnusedDocComment<'a> {
 
 #[derive(Subdiagnostic)]
 pub enum BuiltinUnusedDocCommentSub {
-    #[help(plain_help)]
+    #[help(lint_plain_help)]
     PlainHelp,
-    #[help(block_help)]
+    #[help(lint_block_help)]
     BlockHelp,
 }
 
@@ -242,7 +246,7 @@ impl<'a> DecorateLint<'a, ()> for BuiltinUngatedAsyncFnTrackCaller<'_> {
         self,
         diag: &'b mut rustc_errors::DiagnosticBuilder<'a, ()>,
     ) -> &'b mut rustc_errors::DiagnosticBuilder<'a, ()> {
-        diag.span_label(self.label, fluent::label);
+        diag.span_label(self.label, fluent::lint_label);
         rustc_session::parse::add_feature_diagnostics(
             diag,
             &self.parse_sess,
@@ -337,7 +341,7 @@ impl AddToDiagnostic for BuiltinTypeAliasGenericBoundsSuggestion {
         ) -> rustc_errors::SubdiagnosticMessage,
     {
         diag.multipart_suggestion(
-            fluent::suggestion,
+            fluent::lint_suggestion,
             self.suggestions,
             Applicability::MachineApplicable,
         );
@@ -388,7 +392,7 @@ pub struct BuiltinExplicitOutlives {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion)]
+#[multipart_suggestion(lint_suggestion)]
 pub struct BuiltinExplicitOutlivesSuggestion {
     #[suggestion_part(code = "")]
     pub spans: Vec<Span>,
@@ -407,11 +411,11 @@ pub struct BuiltinIncompleteFeatures {
 }
 
 #[derive(Subdiagnostic)]
-#[help(help)]
+#[help(lint_help)]
 pub struct BuiltinIncompleteFeaturesHelp;
 
 #[derive(Subdiagnostic)]
-#[note(note)]
+#[note(lint_note)]
 pub struct BuiltinIncompleteFeaturesNote {
     pub n: NonZeroU32,
 }
@@ -482,9 +486,9 @@ pub enum BuiltinClashingExtern<'a> {
     SameName {
         this: Symbol,
         orig: Symbol,
-        #[label(previous_decl_label)]
+        #[label(lint_previous_decl_label)]
         previous_decl_label: Span,
-        #[label(mismatch_label)]
+        #[label(lint_mismatch_label)]
         mismatch_label: Span,
         #[subdiagnostic]
         sub: BuiltinClashingExternSub<'a>,
@@ -493,9 +497,9 @@ pub enum BuiltinClashingExtern<'a> {
     DiffName {
         this: Symbol,
         orig: Symbol,
-        #[label(previous_decl_label)]
+        #[label(lint_previous_decl_label)]
         previous_decl_label: Span,
-        #[label(mismatch_label)]
+        #[label(lint_mismatch_label)]
         mismatch_label: Span,
         #[subdiagnostic]
         sub: BuiltinClashingExternSub<'a>,
@@ -571,7 +575,7 @@ pub struct SupertraitAsDerefTarget<'a> {
 }
 
 #[derive(Subdiagnostic)]
-#[label(label)]
+#[label(lint_label)]
 pub struct SupertraitAsDerefTargetLabel {
     #[primary_span]
     pub label: Span,
@@ -604,7 +608,7 @@ pub struct Expectation {
 }
 
 #[derive(Subdiagnostic)]
-#[note(rationale)]
+#[note(lint_rationale)]
 pub struct ExpectationNote {
     pub rationale: Symbol,
 }
@@ -625,13 +629,13 @@ pub struct ForLoopsOverFalliblesDiag<'a> {
 
 #[derive(Subdiagnostic)]
 pub enum ForLoopsOverFalliblesLoopSub<'a> {
-    #[suggestion(remove_next, code = ".by_ref()", applicability = "maybe-incorrect")]
+    #[suggestion(lint_remove_next, code = ".by_ref()", applicability = "maybe-incorrect")]
     RemoveNext {
         #[primary_span]
         suggestion: Span,
         recv_snip: String,
     },
-    #[multipart_suggestion(use_while_let, applicability = "maybe-incorrect")]
+    #[multipart_suggestion(lint_use_while_let, applicability = "maybe-incorrect")]
     UseWhileLet {
         #[suggestion_part(code = "while let {var}(")]
         start_span: Span,
@@ -642,14 +646,14 @@ pub enum ForLoopsOverFalliblesLoopSub<'a> {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(use_question_mark, code = "?", applicability = "maybe-incorrect")]
+#[suggestion(lint_use_question_mark, code = "?", applicability = "maybe-incorrect")]
 pub struct ForLoopsOverFalliblesQuestionMark {
     #[primary_span]
     pub suggestion: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "maybe-incorrect")]
+#[multipart_suggestion(lint_suggestion, applicability = "maybe-incorrect")]
 pub struct ForLoopsOverFalliblesSuggestion<'a> {
     pub var: &'a str,
     #[suggestion_part(code = "if let {var}(")]
@@ -708,13 +712,13 @@ impl AddToDiagnostic for HiddenUnicodeCodepointsDiagSub {
         match self {
             HiddenUnicodeCodepointsDiagSub::Escape { spans } => {
                 diag.multipart_suggestion_with_style(
-                    fluent::suggestion_remove,
+                    fluent::lint_suggestion_remove,
                     spans.iter().map(|(_, span)| (*span, "".to_string())).collect(),
                     Applicability::MachineApplicable,
                     SuggestionStyle::HideCodeAlways,
                 );
                 diag.multipart_suggestion(
-                    fluent::suggestion_escape,
+                    fluent::lint_suggestion_escape,
                     spans
                         .into_iter()
                         .map(|(c, span)| {
@@ -737,8 +741,8 @@ impl AddToDiagnostic for HiddenUnicodeCodepointsDiagSub {
                         .collect::<Vec<String>>()
                         .join(", "),
                 );
-                diag.note(fluent::suggestion_remove);
-                diag.note(fluent::no_suggestion_note_escape);
+                diag.note(fluent::lint_suggestion_remove);
+                diag.note(fluent::lint_no_suggestion_note_escape);
             }
         }
     }
@@ -883,7 +887,7 @@ pub struct RenamedOrRemovedLint<'a> {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(suggestion, code = "{replace}", applicability = "machine-applicable")]
+#[suggestion(lint_suggestion, code = "{replace}", applicability = "machine-applicable")]
 pub struct RenamedOrRemovedLintSuggestion<'a> {
     #[primary_span]
     pub suggestion: Span,
@@ -899,7 +903,7 @@ pub struct UnknownLint {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(suggestion, code = "{replace}", applicability = "maybe-incorrect")]
+#[suggestion(lint_suggestion, code = "{replace}", applicability = "maybe-incorrect")]
 pub struct UnknownLintSuggestion {
     #[primary_span]
     pub suggestion: Span,
@@ -919,9 +923,9 @@ pub struct IgnoredUnlessCrateSpecified<'a> {
 #[note]
 #[help]
 pub struct CStringPtr {
-    #[label(as_ptr_label)]
+    #[label(lint_as_ptr_label)]
     pub as_ptr: Span,
-    #[label(unwrap_label)]
+    #[label(lint_unwrap_label)]
     pub unwrap: Span,
 }
 
@@ -952,7 +956,7 @@ pub struct ConfusableIdentifierPair {
 
 #[derive(LintDiagnostic)]
 #[diag(lint_mixed_script_confusables)]
-#[note(includes_note)]
+#[note(lint_includes_note)]
 #[note]
 pub struct MixedScriptConfusables {
     pub set: String,
@@ -972,17 +976,17 @@ impl<'a> DecorateLint<'a, ()> for NonFmtPanicUnused {
         diag: &'b mut rustc_errors::DiagnosticBuilder<'a, ()>,
     ) -> &'b mut rustc_errors::DiagnosticBuilder<'a, ()> {
         diag.set_arg("count", self.count);
-        diag.note(fluent::note);
+        diag.note(fluent::lint_note);
         if let Some(span) = self.suggestion {
             diag.span_suggestion(
                 span.shrink_to_hi(),
-                fluent::add_args_suggestion,
+                fluent::lint_add_args_suggestion,
                 ", ...",
                 Applicability::HasPlaceholders,
             );
             diag.span_suggestion(
                 span.shrink_to_lo(),
-                fluent::add_fmt_suggestion,
+                fluent::lint_add_fmt_suggestion,
                 "\"{}\", ",
                 Applicability::MachineApplicable,
             );
@@ -1016,12 +1020,12 @@ pub struct NonCamelCaseType<'a> {
 
 #[derive(Subdiagnostic)]
 pub enum NonCamelCaseTypeSub {
-    #[label(label)]
+    #[label(lint_label)]
     Label {
         #[primary_span]
         span: Span,
     },
-    #[suggestion(suggestion, code = "{replace}", applicability = "maybe-incorrect")]
+    #[suggestion(lint_suggestion, code = "{replace}", applicability = "maybe-incorrect")]
     Suggestion {
         #[primary_span]
         span: Span,
@@ -1057,15 +1061,15 @@ impl AddToDiagnostic for NonSnakeCaseDiagSub {
     {
         match self {
             NonSnakeCaseDiagSub::Label { span } => {
-                diag.span_label(span, fluent::label);
+                diag.span_label(span, fluent::lint_label);
             }
             NonSnakeCaseDiagSub::Help => {
-                diag.help(fluent::help);
+                diag.help(fluent::lint_help);
             }
             NonSnakeCaseDiagSub::ConvertSuggestion { span, suggestion } => {
                 diag.span_suggestion(
                     span,
-                    fluent::convert_suggestion,
+                    fluent::lint_convert_suggestion,
                     suggestion,
                     Applicability::MaybeIncorrect,
                 );
@@ -1073,16 +1077,16 @@ impl AddToDiagnostic for NonSnakeCaseDiagSub {
             NonSnakeCaseDiagSub::RenameOrConvertSuggestion { span, suggestion } => {
                 diag.span_suggestion(
                     span,
-                    fluent::rename_or_convert_suggestion,
+                    fluent::lint_rename_or_convert_suggestion,
                     suggestion,
                     Applicability::MaybeIncorrect,
                 );
             }
             NonSnakeCaseDiagSub::SuggestionAndNote { span } => {
-                diag.note(fluent::cannot_convert_note);
+                diag.note(fluent::lint_cannot_convert_note);
                 diag.span_suggestion(
                     span,
-                    fluent::rename_suggestion,
+                    fluent::lint_rename_suggestion,
                     "",
                     Applicability::MaybeIncorrect,
                 );
@@ -1102,12 +1106,12 @@ pub struct NonUpperCaseGlobal<'a> {
 
 #[derive(Subdiagnostic)]
 pub enum NonUpperCaseGlobalSub {
-    #[label(label)]
+    #[label(lint_label)]
     Label {
         #[primary_span]
         span: Span,
     },
-    #[suggestion(suggestion, code = "{replace}", applicability = "maybe-incorrect")]
+    #[suggestion(lint_suggestion, code = "{replace}", applicability = "maybe-incorrect")]
     Suggestion {
         #[primary_span]
         span: Span,
@@ -1225,11 +1229,11 @@ impl AddToDiagnostic for OverflowingBinHexSign {
     {
         match self {
             OverflowingBinHexSign::Positive => {
-                diag.note(fluent::positive_note);
+                diag.note(fluent::lint_positive_note);
             }
             OverflowingBinHexSign::Negative => {
-                diag.note(fluent::negative_note);
-                diag.note(fluent::negative_becomes_note);
+                diag.note(fluent::lint_negative_note);
+                diag.note(fluent::lint_negative_becomes_note);
             }
         }
     }
@@ -1238,7 +1242,7 @@ impl AddToDiagnostic for OverflowingBinHexSign {
 #[derive(Subdiagnostic)]
 pub enum OverflowingBinHexSub<'a> {
     #[suggestion(
-        suggestion,
+        lint_suggestion,
         code = "{sans_suffix}{suggestion_ty}",
         applicability = "machine-applicable"
     )]
@@ -1248,7 +1252,7 @@ pub enum OverflowingBinHexSub<'a> {
         suggestion_ty: &'a str,
         sans_suffix: &'a str,
     },
-    #[help(help)]
+    #[help(lint_help)]
     Help { suggestion_ty: &'a str },
 }
 
@@ -1265,7 +1269,7 @@ pub struct OverflowingInt<'a> {
 }
 
 #[derive(Subdiagnostic)]
-#[help(help)]
+#[help(lint_help)]
 pub struct OverflowingIntHelp<'a> {
     pub suggestion_ty: &'a str,
 }
@@ -1317,13 +1321,13 @@ impl<'a> DecorateLint<'a, ()> for ImproperCTypes<'_> {
     ) -> &'b mut rustc_errors::DiagnosticBuilder<'a, ()> {
         diag.set_arg("ty", self.ty);
         diag.set_arg("desc", self.desc);
-        diag.span_label(self.label, fluent::label);
+        diag.span_label(self.label, fluent::lint_label);
         if let Some(help) = self.help {
             diag.help(help);
         }
         diag.note(self.note);
         if let Some(note) = self.span_note {
-            diag.span_note(note, fluent::note);
+            diag.span_note(note, fluent::lint_note);
         }
         diag
     }
@@ -1416,7 +1420,7 @@ pub struct UnusedDef<'a, 'b> {
 #[derive(Subdiagnostic)]
 pub enum UnusedDefSuggestion {
     #[suggestion(
-        suggestion,
+        lint_suggestion,
         style = "verbose",
         code = "let _ = ",
         applicability = "machine-applicable"
@@ -1460,13 +1464,13 @@ pub struct PathStatementDrop {
 
 #[derive(Subdiagnostic)]
 pub enum PathStatementDropSub {
-    #[suggestion(suggestion, code = "drop({snippet});", applicability = "machine-applicable")]
+    #[suggestion(lint_suggestion, code = "drop({snippet});", applicability = "machine-applicable")]
     Suggestion {
         #[primary_span]
         span: Span,
         snippet: String,
     },
-    #[help(help)]
+    #[help(lint_help)]
     Help {
         #[primary_span]
         span: Span,
@@ -1487,7 +1491,7 @@ pub struct UnusedDelim<'a> {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+#[multipart_suggestion(lint_suggestion, applicability = "machine-applicable")]
 pub struct UnusedDelimSuggestion {
     #[suggestion_part(code = "{start_replace}")]
     pub start_span: Span,
diff --git a/compiler/rustc_lint/src/non_fmt_panic.rs b/compiler/rustc_lint/src/non_fmt_panic.rs
index 548f30ec972..5bb1abfd2ec 100644
--- a/compiler/rustc_lint/src/non_fmt_panic.rs
+++ b/compiler/rustc_lint/src/non_fmt_panic.rs
@@ -1,7 +1,7 @@
 use crate::lints::{NonFmtPanicBraces, NonFmtPanicUnused};
-use crate::{LateContext, LateLintPass, LintContext};
+use crate::{fluent_generated as fluent, LateContext, LateLintPass, LintContext};
 use rustc_ast as ast;
-use rustc_errors::{fluent, Applicability};
+use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_middle::lint::in_external_macro;
@@ -122,18 +122,18 @@ fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tc
     #[allow(rustc::diagnostic_outside_of_impl)]
     cx.struct_span_lint(NON_FMT_PANICS, arg_span, fluent::lint_non_fmt_panic, |lint| {
         lint.set_arg("name", symbol);
-        lint.note(fluent::note);
-        lint.note(fluent::more_info_note);
+        lint.note(fluent::lint_note);
+        lint.note(fluent::lint_more_info_note);
         if !is_arg_inside_call(arg_span, span) {
             // No clue where this argument is coming from.
             return lint;
         }
         if arg_macro.map_or(false, |id| cx.tcx.is_diagnostic_item(sym::format_macro, id)) {
             // A case of `panic!(format!(..))`.
-            lint.note(fluent::supports_fmt_note);
+            lint.note(fluent::lint_supports_fmt_note);
             if let Some((open, close, _)) = find_delimiters(cx, arg_span) {
                 lint.multipart_suggestion(
-                    fluent::supports_fmt_suggestion,
+                    fluent::lint_supports_fmt_suggestion,
                     vec![
                         (arg_span.until(open.shrink_to_hi()), "".into()),
                         (close.until(arg_span.shrink_to_hi()), "".into()),
@@ -179,7 +179,7 @@ fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tc
             if suggest_display {
                 lint.span_suggestion_verbose(
                     arg_span.shrink_to_lo(),
-                    fluent::display_suggestion,
+                    fluent::lint_display_suggestion,
                     "\"{}\", ",
                     fmt_applicability,
                 );
@@ -187,7 +187,7 @@ fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tc
                 lint.set_arg("ty", ty);
                 lint.span_suggestion_verbose(
                     arg_span.shrink_to_lo(),
-                    fluent::debug_suggestion,
+                    fluent::lint_debug_suggestion,
                     "\"{:?}\", ",
                     fmt_applicability,
                 );
@@ -197,7 +197,7 @@ fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tc
                 if let Some((open, close, del)) = find_delimiters(cx, span) {
                     lint.set_arg("already_suggested", suggest_display || suggest_debug);
                     lint.multipart_suggestion(
-                        fluent::panic_suggestion,
+                        fluent::lint_panic_suggestion,
                         if del == '(' {
                             vec![(span.until(open), "std::panic::panic_any".into())]
                         } else {
diff --git a/compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs b/compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs
index 42442cfb190..883a56cb3ce 100644
--- a/compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs
+++ b/compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs
@@ -149,7 +149,7 @@ impl<'tcx> LateLintPass<'tcx> for OpaqueHiddenInferredBound {
 struct OpaqueHiddenInferredBoundLint<'tcx> {
     ty: Ty<'tcx>,
     proj_ty: Ty<'tcx>,
-    #[label(specifically)]
+    #[label(lint_specifically)]
     assoc_pred_span: Span,
     #[subdiagnostic]
     add_bound: Option<AddBound<'tcx>>,
diff --git a/compiler/rustc_lint/src/types.rs b/compiler/rustc_lint/src/types.rs
index b7fd6a254d8..a7f2e9f6eb1 100644
--- a/compiler/rustc_lint/src/types.rs
+++ b/compiler/rustc_lint/src/types.rs
@@ -1,14 +1,17 @@
-use crate::lints::{
-    AtomicOrderingFence, AtomicOrderingLoad, AtomicOrderingStore, ImproperCTypes,
-    InvalidAtomicOrderingDiag, OnlyCastu8ToChar, OverflowingBinHex, OverflowingBinHexSign,
-    OverflowingBinHexSub, OverflowingInt, OverflowingIntHelp, OverflowingLiteral, OverflowingUInt,
-    RangeEndpointOutOfRange, UnusedComparisons, VariantSizeDifferencesDiag,
+use crate::{
+    fluent_generated as fluent,
+    lints::{
+        AtomicOrderingFence, AtomicOrderingLoad, AtomicOrderingStore, ImproperCTypes,
+        InvalidAtomicOrderingDiag, OnlyCastu8ToChar, OverflowingBinHex, OverflowingBinHexSign,
+        OverflowingBinHexSub, OverflowingInt, OverflowingIntHelp, OverflowingLiteral,
+        OverflowingUInt, RangeEndpointOutOfRange, UnusedComparisons, VariantSizeDifferencesDiag,
+    },
 };
 use crate::{LateContext, LateLintPass, LintContext};
 use rustc_ast as ast;
 use rustc_attr as attr;
 use rustc_data_structures::fx::FxHashSet;
-use rustc_errors::{fluent, DiagnosticMessage};
+use rustc_errors::DiagnosticMessage;
 use rustc_hir as hir;
 use rustc_hir::{is_range_literal, Expr, ExprKind, Node};
 use rustc_middle::ty::layout::{IntegerExt, LayoutOf, SizeSkeleton};
diff --git a/compiler/rustc_macros/src/diagnostics/diagnostic.rs b/compiler/rustc_macros/src/diagnostics/diagnostic.rs
index 9ff94486404..12a954258d1 100644
--- a/compiler/rustc_macros/src/diagnostics/diagnostic.rs
+++ b/compiler/rustc_macros/src/diagnostics/diagnostic.rs
@@ -57,7 +57,7 @@ impl<'a> DiagnosticDerive<'a> {
                 }
                 Some(slug) => {
                     quote! {
-                        let mut #diag = #handler.struct_diagnostic(rustc_errors::fluent::#slug);
+                        let mut #diag = #handler.struct_diagnostic(crate::fluent_generated::#slug);
                     }
                 }
             };
@@ -149,7 +149,7 @@ impl<'a> LintDiagnosticDerive<'a> {
                 }
                 Some(slug) => {
                     quote! {
-                        rustc_errors::fluent::#slug.into()
+                        crate::fluent_generated::#slug.into()
                     }
                 }
             }
diff --git a/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs b/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs
index 12bcd939bd6..46068f8c868 100644
--- a/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs
+++ b/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs
@@ -452,7 +452,7 @@ impl<'a> DiagnosticDeriveVariantBuilder<'a> {
                 Ok(quote! {
                     #diag.span_suggestions_with_style(
                         #span_field,
-                        rustc_errors::fluent::#slug,
+                        crate::fluent_generated::#slug,
                         #code_field,
                         #applicability,
                         #style
@@ -476,7 +476,7 @@ impl<'a> DiagnosticDeriveVariantBuilder<'a> {
         quote! {
             #diag.#fn_name(
                 #field_binding,
-                rustc_errors::fluent::#fluent_attr_identifier
+                crate::fluent_generated::#fluent_attr_identifier
             );
         }
     }
@@ -486,7 +486,7 @@ impl<'a> DiagnosticDeriveVariantBuilder<'a> {
     fn add_subdiagnostic(&self, kind: &Ident, fluent_attr_identifier: Path) -> TokenStream {
         let diag = &self.parent.diag;
         quote! {
-            #diag.#kind(rustc_errors::fluent::#fluent_attr_identifier);
+            #diag.#kind(crate::fluent_generated::#fluent_attr_identifier);
         }
     }
 
diff --git a/compiler/rustc_macros/src/diagnostics/fluent.rs b/compiler/rustc_macros/src/diagnostics/fluent.rs
index 08098c9bb2a..38c0f4895db 100644
--- a/compiler/rustc_macros/src/diagnostics/fluent.rs
+++ b/compiler/rustc_macros/src/diagnostics/fluent.rs
@@ -19,52 +19,9 @@ use std::{
     io::Read,
     path::{Path, PathBuf},
 };
-use syn::{
-    parse::{Parse, ParseStream},
-    parse_macro_input,
-    punctuated::Punctuated,
-    token, Ident, LitStr, Result,
-};
+use syn::{parse_macro_input, Ident, LitStr};
 use unic_langid::langid;
 
-struct Resource {
-    krate: Ident,
-    #[allow(dead_code)]
-    fat_arrow_token: token::FatArrow,
-    resource_path: LitStr,
-}
-
-impl Parse for Resource {
-    fn parse(input: ParseStream<'_>) -> Result<Self> {
-        Ok(Resource {
-            krate: input.parse()?,
-            fat_arrow_token: input.parse()?,
-            resource_path: input.parse()?,
-        })
-    }
-}
-
-struct Resources(Punctuated<Resource, token::Comma>);
-
-impl Parse for Resources {
-    fn parse(input: ParseStream<'_>) -> Result<Self> {
-        let mut resources = Punctuated::new();
-        loop {
-            if input.is_empty() || input.peek(token::Brace) {
-                break;
-            }
-            let value = input.parse()?;
-            resources.push_value(value);
-            if !input.peek(token::Comma) {
-                break;
-            }
-            let punct = input.parse()?;
-            resources.push_punct(punct);
-        }
-        Ok(Resources(resources))
-    }
-}
-
 /// Helper function for returning an absolute path for macro-invocation relative file paths.
 ///
 /// If the input is already absolute, then the input is returned. If the input is not absolute,
@@ -84,251 +41,285 @@ fn invocation_relative_path_to_absolute(span: Span, path: &str) -> PathBuf {
     }
 }
 
+/// Tokens to be returned when the macro cannot proceed.
+fn failed(crate_name: &Ident) -> proc_macro::TokenStream {
+    quote! {
+        pub static DEFAULT_LOCALE_RESOURCE: &'static str = "";
+
+        #[allow(non_upper_case_globals)]
+        #[doc(hidden)]
+        pub(crate) mod fluent_generated {
+            pub mod #crate_name {
+            }
+
+            pub mod _subdiag {
+                pub const help: crate::SubdiagnosticMessage =
+                    crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("help"));
+                pub const note: crate::SubdiagnosticMessage =
+                    crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("note"));
+                pub const warn: crate::SubdiagnosticMessage =
+                    crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("warn"));
+                pub const label: crate::SubdiagnosticMessage =
+                    crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("label"));
+                pub const suggestion: crate::SubdiagnosticMessage =
+                    crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("suggestion"));
+            }
+        }
+    }
+    .into()
+}
+
 /// See [rustc_macros::fluent_messages].
 pub(crate) fn fluent_messages(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
-    let resources = parse_macro_input!(input as Resources);
+    let crate_name = std::env::var("CARGO_PKG_NAME")
+        // If `CARGO_PKG_NAME` is missing, then we're probably running in a test, so use
+        // `no_crate`.
+        .unwrap_or_else(|_| "no_crate".to_string())
+        .replace("rustc_", "");
 
     // Cannot iterate over individual messages in a bundle, so do that using the
     // `FluentResource` instead. Construct a bundle anyway to find out if there are conflicting
     // messages in the resources.
     let mut bundle = FluentBundle::new(vec![langid!("en-US")]);
 
-    // Map of Fluent identifiers to the `Span` of the resource that defined them, used for better
-    // diagnostics.
-    let mut previous_defns = HashMap::new();
-
     // Set of Fluent attribute names already output, to avoid duplicate type errors - any given
     // constant created for a given attribute is the same.
     let mut previous_attrs = HashSet::new();
 
-    let mut includes = TokenStream::new();
-    let mut generated = TokenStream::new();
+    let resource_str = parse_macro_input!(input as LitStr);
+    let resource_span = resource_str.span().unwrap();
+    let relative_ftl_path = resource_str.value();
+    let absolute_ftl_path = invocation_relative_path_to_absolute(resource_span, &relative_ftl_path);
 
-    for res in resources.0 {
-        let krate_span = res.krate.span().unwrap();
-        let path_span = res.resource_path.span().unwrap();
+    let crate_name = Ident::new(&crate_name, resource_str.span());
 
-        let relative_ftl_path = res.resource_path.value();
-        let absolute_ftl_path =
-            invocation_relative_path_to_absolute(krate_span, &relative_ftl_path);
-        // As this macro also outputs an `include_str!` for this file, the macro will always be
-        // re-executed when the file changes.
-        let mut resource_file = match File::open(absolute_ftl_path) {
-            Ok(resource_file) => resource_file,
-            Err(e) => {
-                Diagnostic::spanned(path_span, Level::Error, "could not open Fluent resource")
-                    .note(e.to_string())
-                    .emit();
-                continue;
-            }
-        };
-        let mut resource_contents = String::new();
-        if let Err(e) = resource_file.read_to_string(&mut resource_contents) {
-            Diagnostic::spanned(path_span, Level::Error, "could not read Fluent resource")
+    // As this macro also outputs an `include_str!` for this file, the macro will always be
+    // re-executed when the file changes.
+    let mut resource_file = match File::open(absolute_ftl_path) {
+        Ok(resource_file) => resource_file,
+        Err(e) => {
+            Diagnostic::spanned(resource_span, Level::Error, "could not open Fluent resource")
                 .note(e.to_string())
                 .emit();
-            continue;
+            return failed(&crate_name);
         }
-        let resource = match FluentResource::try_new(resource_contents) {
-            Ok(resource) => resource,
-            Err((this, errs)) => {
-                Diagnostic::spanned(path_span, Level::Error, "could not parse Fluent resource")
-                    .help("see additional errors emitted")
-                    .emit();
-                for ParserError { pos, slice: _, kind } in errs {
-                    let mut err = kind.to_string();
-                    // Entirely unnecessary string modification so that the error message starts
-                    // with a lowercase as rustc errors do.
-                    err.replace_range(
-                        0..1,
-                        &err.chars().next().unwrap().to_lowercase().to_string(),
-                    );
+    };
+    let mut resource_contents = String::new();
+    if let Err(e) = resource_file.read_to_string(&mut resource_contents) {
+        Diagnostic::spanned(resource_span, Level::Error, "could not read Fluent resource")
+            .note(e.to_string())
+            .emit();
+        return failed(&crate_name);
+    }
+
+    let resource = match FluentResource::try_new(resource_contents) {
+        Ok(resource) => resource,
+        Err((this, errs)) => {
+            Diagnostic::spanned(resource_span, Level::Error, "could not parse Fluent resource")
+                .help("see additional errors emitted")
+                .emit();
+            for ParserError { pos, slice: _, kind } in errs {
+                let mut err = kind.to_string();
+                // Entirely unnecessary string modification so that the error message starts
+                // with a lowercase as rustc errors do.
+                err.replace_range(0..1, &err.chars().next().unwrap().to_lowercase().to_string());
 
-                    let line_starts: Vec<usize> = std::iter::once(0)
-                        .chain(
-                            this.source()
-                                .char_indices()
-                                .filter_map(|(i, c)| Some(i + 1).filter(|_| c == '\n')),
-                        )
-                        .collect();
-                    let line_start = line_starts
-                        .iter()
-                        .enumerate()
-                        .map(|(line, idx)| (line + 1, idx))
-                        .filter(|(_, idx)| **idx <= pos.start)
-                        .last()
-                        .unwrap()
-                        .0;
+                let line_starts: Vec<usize> = std::iter::once(0)
+                    .chain(
+                        this.source()
+                            .char_indices()
+                            .filter_map(|(i, c)| Some(i + 1).filter(|_| c == '\n')),
+                    )
+                    .collect();
+                let line_start = line_starts
+                    .iter()
+                    .enumerate()
+                    .map(|(line, idx)| (line + 1, idx))
+                    .filter(|(_, idx)| **idx <= pos.start)
+                    .last()
+                    .unwrap()
+                    .0;
 
-                    let snippet = Snippet {
-                        title: Some(Annotation {
-                            label: Some(&err),
-                            id: None,
+                let snippet = Snippet {
+                    title: Some(Annotation {
+                        label: Some(&err),
+                        id: None,
+                        annotation_type: AnnotationType::Error,
+                    }),
+                    footer: vec![],
+                    slices: vec![Slice {
+                        source: this.source(),
+                        line_start,
+                        origin: Some(&relative_ftl_path),
+                        fold: true,
+                        annotations: vec![SourceAnnotation {
+                            label: "",
                             annotation_type: AnnotationType::Error,
-                        }),
-                        footer: vec![],
-                        slices: vec![Slice {
-                            source: this.source(),
-                            line_start,
-                            origin: Some(&relative_ftl_path),
-                            fold: true,
-                            annotations: vec![SourceAnnotation {
-                                label: "",
-                                annotation_type: AnnotationType::Error,
-                                range: (pos.start, pos.end - 1),
-                            }],
+                            range: (pos.start, pos.end - 1),
                         }],
-                        opt: Default::default(),
-                    };
-                    let dl = DisplayList::from(snippet);
-                    eprintln!("{dl}\n");
-                }
-                continue;
+                    }],
+                    opt: Default::default(),
+                };
+                let dl = DisplayList::from(snippet);
+                eprintln!("{dl}\n");
             }
-        };
 
-        let mut constants = TokenStream::new();
-        let mut messagerefs = Vec::new();
-        for entry in resource.entries() {
-            let span = res.krate.span();
-            if let Entry::Message(Message { id: Identifier { name }, attributes, value, .. }) =
-                entry
-            {
-                let _ = previous_defns.entry(name.to_string()).or_insert(path_span);
+            return failed(&crate_name);
+        }
+    };
 
-                if name.contains('-') {
-                    Diagnostic::spanned(
-                        path_span,
-                        Level::Error,
-                        format!("name `{name}` contains a '-' character"),
-                    )
-                    .help("replace any '-'s with '_'s")
-                    .emit();
-                }
+    let mut constants = TokenStream::new();
+    let mut previous_defns = HashMap::new();
+    let mut message_refs = Vec::new();
+    for entry in resource.entries() {
+        if let Entry::Message(Message { id: Identifier { name }, attributes, value, .. }) = entry {
+            let _ = previous_defns.entry(name.to_string()).or_insert(resource_span);
+            if name.contains('-') {
+                Diagnostic::spanned(
+                    resource_span,
+                    Level::Error,
+                    format!("name `{name}` contains a '-' character"),
+                )
+                .help("replace any '-'s with '_'s")
+                .emit();
+            }
 
-                if let Some(Pattern { elements }) = value {
-                    for elt in elements {
-                        if let PatternElement::Placeable {
-                            expression:
-                                Expression::Inline(InlineExpression::MessageReference { id, .. }),
-                        } = elt
-                        {
-                            messagerefs.push((id.name, *name));
-                        }
+            if let Some(Pattern { elements }) = value {
+                for elt in elements {
+                    if let PatternElement::Placeable {
+                        expression:
+                            Expression::Inline(InlineExpression::MessageReference { id, .. }),
+                    } = elt
+                    {
+                        message_refs.push((id.name, *name));
                     }
                 }
+            }
 
-                // Require that the message name starts with the crate name
-                // `hir_typeck_foo_bar` (in `hir_typeck.ftl`)
-                // `const_eval_baz` (in `const_eval.ftl`)
-                // `const-eval-hyphen-having` => `hyphen_having` (in `const_eval.ftl`)
-                // The last case we error about above, but we want to fall back gracefully
-                // so that only the error is being emitted and not also one about the macro
-                // failing.
-                let crate_prefix = format!("{}_", res.krate);
+            // `typeck_foo_bar` => `foo_bar` (in `typeck.ftl`)
+            // `const_eval_baz` => `baz` (in `const_eval.ftl`)
+            // `const-eval-hyphen-having` => `hyphen_having` (in `const_eval.ftl`)
+            // The last case we error about above, but we want to fall back gracefully
+            // so that only the error is being emitted and not also one about the macro
+            // failing.
+            let crate_prefix = format!("{crate_name}_");
 
-                let snake_name = name.replace('-', "_");
-                if !snake_name.starts_with(&crate_prefix) {
+            let snake_name = name.replace('-', "_");
+            if !snake_name.starts_with(&crate_prefix) {
+                Diagnostic::spanned(
+                    resource_span,
+                    Level::Error,
+                    format!("name `{name}` does not start with the crate name"),
+                )
+                .help(format!(
+                    "prepend `{crate_prefix}` to the slug name: `{crate_prefix}{snake_name}`"
+                ))
+                .emit();
+            };
+            let snake_name = Ident::new(&snake_name, resource_str.span());
+
+            if !previous_attrs.insert(snake_name.clone()) {
+                continue;
+            }
+
+            let msg = format!("Constant referring to Fluent message `{name}` from `{crate_name}`");
+            constants.extend(quote! {
+                #[doc = #msg]
+                pub const #snake_name: crate::DiagnosticMessage =
+                    crate::DiagnosticMessage::FluentIdentifier(
+                        std::borrow::Cow::Borrowed(#name),
+                        None
+                    );
+            });
+
+            for Attribute { id: Identifier { name: attr_name }, .. } in attributes {
+                let snake_name = Ident::new(
+                    &format!("{}{}", &crate_prefix, &attr_name.replace('-', "_")),
+                    resource_str.span(),
+                );
+                if !previous_attrs.insert(snake_name.clone()) {
+                    continue;
+                }
+
+                if attr_name.contains('-') {
                     Diagnostic::spanned(
-                        path_span,
+                        resource_span,
                         Level::Error,
-                        format!("name `{name}` does not start with the crate name"),
+                        format!("attribute `{attr_name}` contains a '-' character"),
                     )
-                    .help(format!(
-                        "prepend `{crate_prefix}` to the slug name: `{crate_prefix}{snake_name}`"
-                    ))
+                    .help("replace any '-'s with '_'s")
                     .emit();
-                };
-
-                let snake_name = Ident::new(&snake_name, span);
+                }
 
+                let msg = format!(
+                    "Constant referring to Fluent message `{name}.{attr_name}` from `{crate_name}`"
+                );
                 constants.extend(quote! {
-                    pub const #snake_name: crate::DiagnosticMessage =
-                        crate::DiagnosticMessage::FluentIdentifier(
-                            std::borrow::Cow::Borrowed(#name),
-                            None
+                    #[doc = #msg]
+                    pub const #snake_name: crate::SubdiagnosticMessage =
+                        crate::SubdiagnosticMessage::FluentAttr(
+                            std::borrow::Cow::Borrowed(#attr_name)
                         );
                 });
-
-                for Attribute { id: Identifier { name: attr_name }, .. } in attributes {
-                    let snake_name = Ident::new(&attr_name.replace('-', "_"), span);
-                    if !previous_attrs.insert(snake_name.clone()) {
-                        continue;
-                    }
-
-                    if attr_name.contains('-') {
-                        Diagnostic::spanned(
-                            path_span,
-                            Level::Error,
-                            format!("attribute `{attr_name}` contains a '-' character"),
-                        )
-                        .help("replace any '-'s with '_'s")
-                        .emit();
-                    }
-
-                    constants.extend(quote! {
-                        pub const #snake_name: crate::SubdiagnosticMessage =
-                            crate::SubdiagnosticMessage::FluentAttr(
-                                std::borrow::Cow::Borrowed(#attr_name)
-                            );
-                    });
-                }
             }
         }
+    }
 
-        for (mref, name) in messagerefs.into_iter() {
-            if !previous_defns.contains_key(mref) {
-                Diagnostic::spanned(
-                    path_span,
-                    Level::Error,
-                    format!("referenced message `{mref}` does not exist (in message `{name}`)"),
-                )
-                .help(&format!("you may have meant to use a variable reference (`{{${mref}}}`)"))
-                .emit();
-            }
+    for (mref, name) in message_refs.into_iter() {
+        if !previous_defns.contains_key(mref) {
+            Diagnostic::spanned(
+                resource_span,
+                Level::Error,
+                format!("referenced message `{mref}` does not exist (in message `{name}`)"),
+            )
+            .help(&format!("you may have meant to use a variable reference (`{{${mref}}}`)"))
+            .emit();
         }
+    }
 
-        if let Err(errs) = bundle.add_resource(resource) {
-            for e in errs {
-                match e {
-                    FluentError::Overriding { kind, id } => {
-                        Diagnostic::spanned(
-                            path_span,
-                            Level::Error,
-                            format!("overrides existing {kind}: `{id}`"),
-                        )
-                        .span_help(previous_defns[&id], "previously defined in this resource")
-                        .emit();
-                    }
-                    FluentError::ResolverError(_) | FluentError::ParserError(_) => unreachable!(),
+    if let Err(errs) = bundle.add_resource(resource) {
+        for e in errs {
+            match e {
+                FluentError::Overriding { kind, id } => {
+                    Diagnostic::spanned(
+                        resource_span,
+                        Level::Error,
+                        format!("overrides existing {kind}: `{id}`"),
+                    )
+                    .emit();
                 }
+                FluentError::ResolverError(_) | FluentError::ParserError(_) => unreachable!(),
             }
         }
-
-        includes.extend(quote! { include_str!(#relative_ftl_path), });
-
-        generated.extend(constants);
     }
 
     quote! {
+        /// Raw content of Fluent resource for this crate, generated by `fluent_messages` macro,
+        /// imported by `rustc_driver` to include all crates' resources in one bundle.
+        pub static DEFAULT_LOCALE_RESOURCE: &'static str = include_str!(#relative_ftl_path);
+
         #[allow(non_upper_case_globals)]
         #[doc(hidden)]
-        pub mod fluent_generated {
-            pub static DEFAULT_LOCALE_RESOURCES: &'static [&'static str] = &[
-                #includes
-            ];
-
-            #generated
+        /// Auto-generated constants for type-checked references to Fluent messages.
+        pub(crate) mod fluent_generated {
+            #constants
 
+            /// Constants expected to exist by the diagnostic derive macros to use as default Fluent
+            /// identifiers for different subdiagnostic kinds.
             pub mod _subdiag {
+                /// Default for `#[help]`
                 pub const help: crate::SubdiagnosticMessage =
                     crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("help"));
+                /// Default for `#[note]`
                 pub const note: crate::SubdiagnosticMessage =
                     crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("note"));
+                /// Default for `#[warn]`
                 pub const warn: crate::SubdiagnosticMessage =
                     crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("warn"));
+                /// Default for `#[label]`
                 pub const label: crate::SubdiagnosticMessage =
                     crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("label"));
+                /// Default for `#[suggestion]`
                 pub const suggestion: crate::SubdiagnosticMessage =
                     crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("suggestion"));
             }
diff --git a/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs b/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs
index 906e4c0b0e1..90660fc1f93 100644
--- a/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs
+++ b/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs
@@ -512,7 +512,9 @@ impl<'parent, 'a> SubdiagnosticDeriveVariantBuilder<'parent, 'a> {
         let mut calls = TokenStream::new();
         for (kind, slug) in kind_slugs {
             let message = format_ident!("__message");
-            calls.extend(quote! { let #message = #f(#diag, rustc_errors::fluent::#slug.into()); });
+            calls.extend(
+                quote! { let #message = #f(#diag, crate::fluent_generated::#slug.into()); },
+            );
 
             let name = format_ident!("{}{}", if span_field.is_some() { "span_" } else { "" }, kind);
             let call = match kind {
diff --git a/compiler/rustc_macros/src/lib.rs b/compiler/rustc_macros/src/lib.rs
index d2cb6ee9f71..737500cc257 100644
--- a/compiler/rustc_macros/src/lib.rs
+++ b/compiler/rustc_macros/src/lib.rs
@@ -61,9 +61,7 @@ pub fn newtype_index(input: TokenStream) -> TokenStream {
 /// For example, given the following invocation of the macro..
 ///
 /// ```ignore (rust)
-/// fluent_messages! {
-///     typeck => "./typeck.ftl",
-/// }
+/// fluent_messages! { "./typeck.ftl" }
 /// ```
 /// ..where `typeck.ftl` has the following contents..
 ///
@@ -77,9 +75,7 @@ pub fn newtype_index(input: TokenStream) -> TokenStream {
 /// will generate the following code:
 ///
 /// ```ignore (rust)
-/// pub static DEFAULT_LOCALE_RESOURCES: &'static [&'static str] = &[
-///     include_str!("./typeck.ftl"),
-/// ];
+/// pub static DEFAULT_LOCALE_RESOURCE: &'static [&'static str] = include_str!("./typeck.ftl");
 ///
 /// mod fluent_generated {
 ///     mod typeck {
diff --git a/compiler/rustc_metadata/locales/en-US.ftl b/compiler/rustc_metadata/locales/en-US.ftl
new file mode 100644
index 00000000000..79b8b417257
--- /dev/null
+++ b/compiler/rustc_metadata/locales/en-US.ftl
@@ -0,0 +1,288 @@
+metadata_rlib_required =
+    crate `{$crate_name}` required to be available in rlib format, but was not found in this form
+
+metadata_lib_required =
+    crate `{$crate_name}` required to be available in {$kind} format, but was not found in this form
+
+metadata_rustc_lib_required =
+    crate `{$crate_name}` required to be available in {$kind} format, but was not found in this form
+    .note = only .rmeta files are distributed for `rustc_private` crates other than `rustc_driver`
+    .help = try adding `extern crate rustc_driver;` at the top level of this crate
+
+metadata_crate_dep_multiple =
+    cannot satisfy dependencies so `{$crate_name}` only shows up once
+    .help = having upstream crates all available in one format will likely make this go away
+
+metadata_two_panic_runtimes =
+    cannot link together two panic runtimes: {$prev_name} and {$cur_name}
+
+metadata_bad_panic_strategy =
+    the linked panic runtime `{$runtime}` is not compiled with this crate's panic strategy `{$strategy}`
+
+metadata_required_panic_strategy =
+    the crate `{$crate_name}` requires panic strategy `{$found_strategy}` which is incompatible with this crate's strategy of `{$desired_strategy}`
+
+metadata_incompatible_panic_in_drop_strategy =
+    the crate `{$crate_name}` is compiled with the panic-in-drop strategy `{$found_strategy}` which is incompatible with this crate's strategy of `{$desired_strategy}`
+
+metadata_multiple_names_in_link =
+    multiple `name` arguments in a single `#[link]` attribute
+
+metadata_multiple_kinds_in_link =
+    multiple `kind` arguments in a single `#[link]` attribute
+
+metadata_link_name_form =
+    link name must be of the form `name = "string"`
+
+metadata_link_kind_form =
+    link kind must be of the form `kind = "string"`
+
+metadata_link_modifiers_form =
+    link modifiers must be of the form `modifiers = "string"`
+
+metadata_link_cfg_form =
+    link cfg must be of the form `cfg(/* predicate */)`
+
+metadata_wasm_import_form =
+    wasm import module must be of the form `wasm_import_module = "string"`
+
+metadata_empty_link_name =
+    link name must not be empty
+    .label = empty link name
+
+metadata_link_framework_apple =
+    link kind `framework` is only supported on Apple targets
+
+metadata_framework_only_windows =
+    link kind `raw-dylib` is only supported on Windows targets
+
+metadata_unknown_link_kind =
+    unknown link kind `{$kind}`, expected one of: static, dylib, framework, raw-dylib
+    .label = unknown link kind
+
+metadata_multiple_link_modifiers =
+    multiple `modifiers` arguments in a single `#[link]` attribute
+
+metadata_multiple_cfgs =
+    multiple `cfg` arguments in a single `#[link]` attribute
+
+metadata_link_cfg_single_predicate =
+    link cfg must have a single predicate argument
+
+metadata_multiple_wasm_import =
+    multiple `wasm_import_module` arguments in a single `#[link]` attribute
+
+metadata_unexpected_link_arg =
+    unexpected `#[link]` argument, expected one of: name, kind, modifiers, cfg, wasm_import_module, import_name_type
+
+metadata_invalid_link_modifier =
+    invalid linking modifier syntax, expected '+' or '-' prefix before one of: bundle, verbatim, whole-archive, as-needed
+
+metadata_multiple_modifiers =
+    multiple `{$modifier}` modifiers in a single `modifiers` argument
+
+metadata_bundle_needs_static =
+    linking modifier `bundle` is only compatible with `static` linking kind
+
+metadata_whole_archive_needs_static =
+    linking modifier `whole-archive` is only compatible with `static` linking kind
+
+metadata_as_needed_compatibility =
+    linking modifier `as-needed` is only compatible with `dylib` and `framework` linking kinds
+
+metadata_unknown_link_modifier =
+    unknown linking modifier `{$modifier}`, expected one of: bundle, verbatim, whole-archive, as-needed
+
+metadata_incompatible_wasm_link =
+    `wasm_import_module` is incompatible with other arguments in `#[link]` attributes
+
+metadata_link_requires_name =
+    `#[link]` attribute requires a `name = "string"` argument
+    .label = missing `name` argument
+
+metadata_raw_dylib_no_nul =
+    link name must not contain NUL characters if link kind is `raw-dylib`
+
+metadata_link_ordinal_raw_dylib =
+    `#[link_ordinal]` is only supported if link kind is `raw-dylib`
+
+metadata_lib_framework_apple =
+    library kind `framework` is only supported on Apple targets
+
+metadata_empty_renaming_target =
+    an empty renaming target was specified for library `{$lib_name}`
+
+metadata_renaming_no_link =
+    renaming of the library `{$lib_name}` was specified, however this crate contains no `#[link(...)]` attributes referencing this library
+
+metadata_multiple_renamings =
+    multiple renamings were specified for library `{$lib_name}`
+
+metadata_no_link_mod_override =
+    overriding linking modifiers from command line is not supported
+
+metadata_unsupported_abi_i686 =
+    ABI not supported by `#[link(kind = "raw-dylib")]` on i686
+
+metadata_unsupported_abi =
+    ABI not supported by `#[link(kind = "raw-dylib")]` on this architecture
+
+metadata_fail_create_file_encoder =
+    failed to create file encoder: {$err}
+
+metadata_fail_seek_file =
+    failed to seek the file: {$err}
+
+metadata_fail_write_file =
+    failed to write to the file: {$err}
+
+metadata_crate_not_panic_runtime =
+    the crate `{$crate_name}` is not a panic runtime
+
+metadata_no_panic_strategy =
+    the crate `{$crate_name}` does not have the panic strategy `{$strategy}`
+
+metadata_profiler_builtins_needs_core =
+    `profiler_builtins` crate (required by compiler options) is not compatible with crate attribute `#![no_core]`
+
+metadata_not_profiler_runtime =
+    the crate `{$crate_name}` is not a profiler runtime
+
+metadata_no_multiple_global_alloc =
+    cannot define multiple global allocators
+    .label = cannot define a new global allocator
+
+metadata_prev_global_alloc =
+    previous global allocator defined here
+
+metadata_no_multiple_alloc_error_handler =
+    cannot define multiple allocation error handlers
+    .label = cannot define a new allocation error handler
+
+metadata_prev_alloc_error_handler =
+    previous allocation error handler defined here
+
+metadata_conflicting_global_alloc =
+    the `#[global_allocator]` in {$other_crate_name} conflicts with global allocator in: {$crate_name}
+
+metadata_conflicting_alloc_error_handler =
+    the `#[alloc_error_handler]` in {$other_crate_name} conflicts with allocation error handler in: {$crate_name}
+
+metadata_global_alloc_required =
+    no global memory allocator found but one is required; link to std or add `#[global_allocator]` to a static item that implements the GlobalAlloc trait
+
+metadata_no_transitive_needs_dep =
+    the crate `{$crate_name}` cannot depend on a crate that needs {$needs_crate_name}, but it depends on `{$deps_crate_name}`
+
+metadata_failed_write_error =
+    failed to write {$filename}: {$err}
+
+metadata_missing_native_library =
+    could not find native static library `{$libname}`, perhaps an -L flag is missing?
+
+metadata_only_provide_library_name = only provide the library name `{$suggested_name}`, not the full filename
+
+metadata_failed_create_tempdir =
+    couldn't create a temp dir: {$err}
+
+metadata_failed_create_file =
+    failed to create the file {$filename}: {$err}
+
+metadata_failed_create_encoded_metadata =
+    failed to create encoded metadata from file: {$err}
+
+metadata_non_ascii_name =
+    cannot load a crate with a non-ascii name `{$crate_name}`
+
+metadata_extern_location_not_exist =
+    extern location for {$crate_name} does not exist: {$location}
+
+metadata_extern_location_not_file =
+    extern location for {$crate_name} is not a file: {$location}
+
+metadata_multiple_candidates =
+    multiple candidates for `{$flavor}` dependency `{$crate_name}` found
+
+metadata_symbol_conflicts_current =
+    the current crate is indistinguishable from one of its dependencies: it has the same crate-name `{$crate_name}` and was compiled with the same `-C metadata` arguments. This will result in symbol conflicts between the two.
+
+metadata_symbol_conflicts_others =
+    found two different crates with name `{$crate_name}` that are not distinguished by differing `-C metadata`. This will result in symbol conflicts between the two.
+
+metadata_stable_crate_id_collision =
+    found crates (`{$crate_name0}` and `{$crate_name1}`) with colliding StableCrateId values.
+
+metadata_dl_error =
+    {$err}
+
+metadata_newer_crate_version =
+    found possibly newer version of crate `{$crate_name}`{$add_info}
+    .note = perhaps that crate needs to be recompiled?
+
+metadata_found_crate_versions =
+    the following crate versions were found:{$found_crates}
+
+metadata_no_crate_with_triple =
+    couldn't find crate `{$crate_name}` with expected target triple {$locator_triple}{$add_info}
+
+metadata_found_staticlib =
+    found staticlib `{$crate_name}` instead of rlib or dylib{$add_info}
+    .help = please recompile that crate using --crate-type lib
+
+metadata_incompatible_rustc =
+    found crate `{$crate_name}` compiled by an incompatible version of rustc{$add_info}
+    .help = please recompile that crate using this compiler ({$rustc_version}) (consider running `cargo clean` first)
+
+metadata_invalid_meta_files =
+    found invalid metadata files for crate `{$crate_name}`{$add_info}
+
+metadata_cannot_find_crate =
+    can't find crate for `{$crate_name}`{$add_info}
+
+metadata_no_dylib_plugin =
+    plugin `{$crate_name}` only found in rlib format, but must be available in dylib format
+
+metadata_target_not_installed =
+    the `{$locator_triple}` target may not be installed
+
+metadata_target_no_std_support =
+    the `{$locator_triple}` target may not support the standard library
+
+metadata_consider_downloading_target =
+    consider downloading the target with `rustup target add {$locator_triple}`
+
+metadata_std_required =
+    `std` is required by `{$current_crate}` because it does not declare `#![no_std]`
+
+metadata_consider_building_std =
+    consider building the standard library from source with `cargo build -Zbuild-std`
+
+metadata_compiler_missing_profiler =
+    the compiler may have been built without the profiler runtime
+
+metadata_install_missing_components =
+    maybe you need to install the missing components with: `rustup component add rust-src rustc-dev llvm-tools-preview`
+
+metadata_cant_find_crate =
+    can't find crate
+
+metadata_crate_location_unknown_type =
+    extern location for {$crate_name} is of an unknown type: {$path}
+
+metadata_lib_filename_form =
+    file name should be lib*.rlib or {$dll_prefix}*{$dll_suffix}
+
+metadata_multiple_import_name_type =
+    multiple `import_name_type` arguments in a single `#[link]` attribute
+
+metadata_import_name_type_form =
+    import name type must be of the form `import_name_type = "string"`
+
+metadata_import_name_type_x86 =
+    import name type is only supported on x86
+
+metadata_unknown_import_name_type =
+    unknown import name type `{$import_name_type}`, expected one of: decorated, noprefix, undecorated
+
+metadata_import_name_type_raw =
+    import name type can only be used with link kind `raw-dylib`
diff --git a/compiler/rustc_metadata/src/errors.rs b/compiler/rustc_metadata/src/errors.rs
index c32686779fa..51b41b5f6a2 100644
--- a/compiler/rustc_metadata/src/errors.rs
+++ b/compiler/rustc_metadata/src/errors.rs
@@ -9,6 +9,7 @@ use rustc_session::config;
 use rustc_span::{sym, Span, Symbol};
 use rustc_target::spec::{PanicStrategy, TargetTriple};
 
+use crate::fluent_generated as fluent;
 use crate::locator::CrateFlavor;
 
 #[derive(Diagnostic)]
@@ -491,7 +492,7 @@ impl IntoDiagnostic<'_> for MultipleCandidates {
         self,
         handler: &'_ rustc_errors::Handler,
     ) -> rustc_errors::DiagnosticBuilder<'_, ErrorGuaranteed> {
-        let mut diag = handler.struct_err(rustc_errors::fluent::metadata_multiple_candidates);
+        let mut diag = handler.struct_err(fluent::metadata_multiple_candidates);
         diag.set_arg("crate_name", self.crate_name);
         diag.set_arg("flavor", self.flavor);
         diag.code(error_code!(E0464));
@@ -590,7 +591,7 @@ impl IntoDiagnostic<'_> for InvalidMetadataFiles {
         self,
         handler: &'_ rustc_errors::Handler,
     ) -> rustc_errors::DiagnosticBuilder<'_, ErrorGuaranteed> {
-        let mut diag = handler.struct_err(rustc_errors::fluent::metadata_invalid_meta_files);
+        let mut diag = handler.struct_err(fluent::metadata_invalid_meta_files);
         diag.set_arg("crate_name", self.crate_name);
         diag.set_arg("add_info", self.add_info);
         diag.code(error_code!(E0786));
@@ -619,7 +620,7 @@ impl IntoDiagnostic<'_> for CannotFindCrate {
         self,
         handler: &'_ rustc_errors::Handler,
     ) -> rustc_errors::DiagnosticBuilder<'_, ErrorGuaranteed> {
-        let mut diag = handler.struct_err(rustc_errors::fluent::metadata_cannot_find_crate);
+        let mut diag = handler.struct_err(fluent::metadata_cannot_find_crate);
         diag.set_arg("crate_name", self.crate_name);
         diag.set_arg("current_crate", self.current_crate);
         diag.set_arg("add_info", self.add_info);
@@ -630,32 +631,32 @@ impl IntoDiagnostic<'_> for CannotFindCrate {
             && self.locator_triple != TargetTriple::from_triple(config::host_triple())
         {
             if self.missing_core {
-                diag.note(rustc_errors::fluent::metadata_target_not_installed);
+                diag.note(fluent::metadata_target_not_installed);
             } else {
-                diag.note(rustc_errors::fluent::metadata_target_no_std_support);
+                diag.note(fluent::metadata_target_no_std_support);
             }
             // NOTE: this suggests using rustup, even though the user may not have it installed.
             // That's because they could choose to install it; or this may give them a hint which
             // target they need to install from their distro.
             if self.missing_core {
-                diag.help(rustc_errors::fluent::metadata_consider_downloading_target);
+                diag.help(fluent::metadata_consider_downloading_target);
             }
             // Suggest using #![no_std]. #[no_core] is unstable and not really supported anyway.
             // NOTE: this is a dummy span if `extern crate std` was injected by the compiler.
             // If it's not a dummy, that means someone added `extern crate std` explicitly and
             // `#![no_std]` won't help.
             if !self.missing_core && self.span.is_dummy() {
-                diag.note(rustc_errors::fluent::metadata_std_required);
+                diag.note(fluent::metadata_std_required);
             }
             if self.is_nightly_build {
-                diag.help(rustc_errors::fluent::metadata_consider_building_std);
+                diag.help(fluent::metadata_consider_building_std);
             }
         } else if self.crate_name == self.profiler_runtime {
-            diag.note(rustc_errors::fluent::metadata_compiler_missing_profiler);
+            diag.note(fluent::metadata_compiler_missing_profiler);
         } else if self.crate_name.as_str().starts_with("rustc_") {
-            diag.help(rustc_errors::fluent::metadata_install_missing_components);
+            diag.help(fluent::metadata_install_missing_components);
         }
-        diag.span_label(self.span, rustc_errors::fluent::metadata_cant_find_crate);
+        diag.span_label(self.span, fluent::metadata_cant_find_crate);
         diag
     }
 }
diff --git a/compiler/rustc_metadata/src/lib.rs b/compiler/rustc_metadata/src/lib.rs
index 1987f88e6b8..6f6d3731cea 100644
--- a/compiler/rustc_metadata/src/lib.rs
+++ b/compiler/rustc_metadata/src/lib.rs
@@ -30,6 +30,8 @@ extern crate rustc_data_structures;
 extern crate tracing;
 
 pub use rmeta::{provide, provide_extern};
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
 
 mod dependency_format;
 mod foreign_modules;
@@ -44,3 +46,5 @@ pub mod locator;
 pub use fs::{emit_wrapper_file, METADATA_FILENAME};
 pub use native_libs::find_native_static_library;
 pub use rmeta::{encode_metadata, EncodedMetadata, METADATA_HEADER};
+
+fluent_messages! { "../locales/en-US.ftl" }
diff --git a/compiler/rustc_middle/locales/en-US.ftl b/compiler/rustc_middle/locales/en-US.ftl
new file mode 100644
index 00000000000..4f4e5c6a2c9
--- /dev/null
+++ b/compiler/rustc_middle/locales/en-US.ftl
@@ -0,0 +1,36 @@
+middle_drop_check_overflow =
+    overflow while adding drop-check rules for {$ty}
+    .note = overflowed on {$overflow_ty}
+
+middle_opaque_hidden_type_mismatch =
+    concrete type differs from previous defining opaque type use
+    .label = expected `{$self_ty}`, got `{$other_ty}`
+
+middle_conflict_types =
+    this expression supplies two conflicting concrete types for the same opaque type
+
+middle_previous_use_here =
+    previous use here
+
+middle_limit_invalid =
+    `limit` must be a non-negative integer
+    .label = {$error_str}
+
+middle_const_eval_non_int =
+    constant evaluation of enum discriminant resulted in non-integer
+
+middle_unknown_layout =
+    the type `{$ty}` has an unknown layout
+
+middle_values_too_big =
+    values of the type `{$ty}` are too big for the current architecture
+
+middle_cannot_be_normalized =
+    unable to determine layout for `{$ty}` because `{$failure_ty}` cannot be normalized
+
+middle_strict_coherence_needs_negative_coherence =
+    to use `strict_coherence` on this trait, the `with_negative_coherence` feature must be enabled
+    .label = due to this attribute
+
+middle_const_not_used_in_type_alias =
+    const parameter `{$ct}` is part of concrete type but not used in parameter list for the `impl Trait` type alias
diff --git a/compiler/rustc_middle/src/lib.rs b/compiler/rustc_middle/src/lib.rs
index e6cd38c0f15..c33b9d84eb0 100644
--- a/compiler/rustc_middle/src/lib.rs
+++ b/compiler/rustc_middle/src/lib.rs
@@ -73,6 +73,9 @@ extern crate tracing;
 #[macro_use]
 extern crate smallvec;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
 #[cfg(test)]
 mod tests;
 
@@ -105,3 +108,5 @@ pub mod util {
 
 // Allows macros to refer to this crate as `::rustc_middle`
 extern crate self as rustc_middle;
+
+fluent_messages! { "../locales/en-US.ftl" }
diff --git a/compiler/rustc_middle/src/ty/diagnostics.rs b/compiler/rustc_middle/src/ty/diagnostics.rs
index a029c1b209d..bdc58611092 100644
--- a/compiler/rustc_middle/src/ty/diagnostics.rs
+++ b/compiler/rustc_middle/src/ty/diagnostics.rs
@@ -612,3 +612,11 @@ impl<'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for MakeSuggestableFolder<'tcx> {
         c.try_super_fold_with(self)
     }
 }
+
+#[derive(Diagnostic)]
+#[diag(middle_const_not_used_in_type_alias)]
+pub(super) struct ConstNotUsedTraitAlias {
+    pub ct: String,
+    #[primary_span]
+    pub span: Span,
+}
diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs
index 993191ee96a..2d92f377041 100644
--- a/compiler/rustc_middle/src/ty/layout.rs
+++ b/compiler/rustc_middle/src/ty/layout.rs
@@ -1,3 +1,4 @@
+use crate::fluent_generated as fluent;
 use crate::middle::codegen_fn_attrs::CodegenFnAttrFlags;
 use crate::ty::normalize_erasing_regions::NormalizationError;
 use crate::ty::{self, ReprOptions, Ty, TyCtxt, TypeVisitable};
@@ -182,16 +183,16 @@ impl IntoDiagnostic<'_, !> for LayoutError<'_> {
         match self {
             LayoutError::Unknown(ty) => {
                 diag.set_arg("ty", ty);
-                diag.set_primary_message(rustc_errors::fluent::middle_unknown_layout);
+                diag.set_primary_message(fluent::middle_unknown_layout);
             }
             LayoutError::SizeOverflow(ty) => {
                 diag.set_arg("ty", ty);
-                diag.set_primary_message(rustc_errors::fluent::middle_values_too_big);
+                diag.set_primary_message(fluent::middle_values_too_big);
             }
             LayoutError::NormalizationFailure(ty, e) => {
                 diag.set_arg("ty", ty);
                 diag.set_arg("failure_ty", e.get_type_for_failure());
-                diag.set_primary_message(rustc_errors::fluent::middle_cannot_be_normalized);
+                diag.set_primary_message(fluent::middle_cannot_be_normalized);
             }
         }
         diag
diff --git a/compiler/rustc_mir_build/locales/en-US.ftl b/compiler/rustc_mir_build/locales/en-US.ftl
new file mode 100644
index 00000000000..f9bda721df3
--- /dev/null
+++ b/compiler/rustc_mir_build/locales/en-US.ftl
@@ -0,0 +1,376 @@
+mir_build_unconditional_recursion = function cannot return without recursing
+    .label = cannot return without recursing
+    .help = a `loop` may express intention better if this is on purpose
+
+mir_build_unconditional_recursion_call_site_label = recursive call site
+
+mir_build_unsafe_op_in_unsafe_fn_call_to_unsafe_fn_requires_unsafe =
+    call to unsafe function `{$function}` is unsafe and requires unsafe block (error E0133)
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_unsafe_op_in_unsafe_fn_call_to_unsafe_fn_requires_unsafe_nameless =
+    call to unsafe function is unsafe and requires unsafe block (error E0133)
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_unsafe_op_in_unsafe_fn_inline_assembly_requires_unsafe =
+    use of inline assembly is unsafe and requires unsafe block (error E0133)
+    .note = inline assembly is entirely unchecked and can cause undefined behavior
+    .label = use of inline assembly
+
+mir_build_unsafe_op_in_unsafe_fn_initializing_type_with_requires_unsafe =
+    initializing type with `rustc_layout_scalar_valid_range` attr is unsafe and requires unsafe
+    block (error E0133)
+    .note = initializing a layout restricted type's field with a value outside the valid range is undefined behavior
+    .label = initializing type with `rustc_layout_scalar_valid_range` attr
+
+mir_build_unsafe_op_in_unsafe_fn_mutable_static_requires_unsafe =
+    use of mutable static is unsafe and requires unsafe block (error E0133)
+    .note = mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
+    .label = use of mutable static
+
+mir_build_unsafe_op_in_unsafe_fn_extern_static_requires_unsafe =
+    use of extern static is unsafe and requires unsafe block (error E0133)
+    .note = extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
+    .label = use of extern static
+
+mir_build_unsafe_op_in_unsafe_fn_deref_raw_pointer_requires_unsafe =
+    dereference of raw pointer is unsafe and requires unsafe block (error E0133)
+    .note = raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
+    .label = dereference of raw pointer
+
+mir_build_unsafe_op_in_unsafe_fn_union_field_requires_unsafe =
+    access to union field is unsafe and requires unsafe block (error E0133)
+    .note = the field may not be properly initialized: using uninitialized data will cause undefined behavior
+    .label = access to union field
+
+mir_build_unsafe_op_in_unsafe_fn_mutation_of_layout_constrained_field_requires_unsafe =
+    mutation of layout constrained field is unsafe and requires unsafe block (error E0133)
+    .note = mutating layout constrained fields cannot statically be checked for valid values
+    .label = mutation of layout constrained field
+
+mir_build_unsafe_op_in_unsafe_fn_borrow_of_layout_constrained_field_requires_unsafe =
+    borrow of layout constrained field with interior mutability is unsafe and requires unsafe block (error E0133)
+    .note = references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values
+    .label = borrow of layout constrained field with interior mutability
+
+mir_build_unsafe_op_in_unsafe_fn_call_to_fn_with_requires_unsafe =
+    call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe block (error E0133)
+    .note = can only be called if the required target features are available
+    .label = call to function with `#[target_feature]`
+
+mir_build_call_to_unsafe_fn_requires_unsafe =
+    call to unsafe function `{$function}` is unsafe and requires unsafe block
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_call_to_unsafe_fn_requires_unsafe_nameless =
+    call to unsafe function is unsafe and requires unsafe block
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_call_to_unsafe_fn_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    call to unsafe function `{$function}` is unsafe and requires unsafe function or block
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_call_to_unsafe_fn_requires_unsafe_nameless_unsafe_op_in_unsafe_fn_allowed =
+    call to unsafe function is unsafe and requires unsafe function or block
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_inline_assembly_requires_unsafe =
+    use of inline assembly is unsafe and requires unsafe block
+    .note = inline assembly is entirely unchecked and can cause undefined behavior
+    .label = use of inline assembly
+
+mir_build_inline_assembly_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    use of inline assembly is unsafe and requires unsafe function or block
+    .note = inline assembly is entirely unchecked and can cause undefined behavior
+    .label = use of inline assembly
+
+mir_build_initializing_type_with_requires_unsafe =
+    initializing type with `rustc_layout_scalar_valid_range` attr is unsafe and requires unsafe block
+    .note = initializing a layout restricted type's field with a value outside the valid range is undefined behavior
+    .label = initializing type with `rustc_layout_scalar_valid_range` attr
+
+mir_build_initializing_type_with_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    initializing type with `rustc_layout_scalar_valid_range` attr is unsafe and requires unsafe function or block
+    .note = initializing a layout restricted type's field with a value outside the valid range is undefined behavior
+    .label = initializing type with `rustc_layout_scalar_valid_range` attr
+
+mir_build_mutable_static_requires_unsafe =
+    use of mutable static is unsafe and requires unsafe block
+    .note = mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
+    .label = use of mutable static
+
+mir_build_mutable_static_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    use of mutable static is unsafe and requires unsafe function or block
+    .note = mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
+    .label = use of mutable static
+
+mir_build_extern_static_requires_unsafe =
+    use of extern static is unsafe and requires unsafe block
+    .note = extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
+    .label = use of extern static
+
+mir_build_extern_static_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    use of extern static is unsafe and requires unsafe function or block
+    .note = extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
+    .label = use of extern static
+
+mir_build_deref_raw_pointer_requires_unsafe =
+    dereference of raw pointer is unsafe and requires unsafe block
+    .note = raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
+    .label = dereference of raw pointer
+
+mir_build_deref_raw_pointer_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    dereference of raw pointer is unsafe and requires unsafe function or block
+    .note = raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
+    .label = dereference of raw pointer
+
+mir_build_union_field_requires_unsafe =
+    access to union field is unsafe and requires unsafe block
+    .note = the field may not be properly initialized: using uninitialized data will cause undefined behavior
+    .label = access to union field
+
+mir_build_union_field_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    access to union field is unsafe and requires unsafe function or block
+    .note = the field may not be properly initialized: using uninitialized data will cause undefined behavior
+    .label = access to union field
+
+mir_build_mutation_of_layout_constrained_field_requires_unsafe =
+    mutation of layout constrained field is unsafe and requires unsafe block
+    .note = mutating layout constrained fields cannot statically be checked for valid values
+    .label = mutation of layout constrained field
+
+mir_build_mutation_of_layout_constrained_field_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    mutation of layout constrained field is unsafe and requires unsafe function or block
+    .note = mutating layout constrained fields cannot statically be checked for valid values
+    .label = mutation of layout constrained field
+
+mir_build_borrow_of_layout_constrained_field_requires_unsafe =
+    borrow of layout constrained field with interior mutability is unsafe and requires unsafe block
+    .note = references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values
+    .label = borrow of layout constrained field with interior mutability
+
+mir_build_borrow_of_layout_constrained_field_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    borrow of layout constrained field with interior mutability is unsafe and requires unsafe function or block
+    .note = references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values
+    .label = borrow of layout constrained field with interior mutability
+
+mir_build_call_to_fn_with_requires_unsafe =
+    call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe block
+    .note = can only be called if the required target features are available
+    .label = call to function with `#[target_feature]`
+
+mir_build_call_to_fn_with_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe function or block
+    .note = can only be called if the required target features are available
+    .label = call to function with `#[target_feature]`
+
+mir_build_unused_unsafe = unnecessary `unsafe` block
+    .label = unnecessary `unsafe` block
+
+mir_build_unused_unsafe_enclosing_block_label = because it's nested under this `unsafe` block
+mir_build_unused_unsafe_enclosing_fn_label = because it's nested under this `unsafe` fn
+
+mir_build_non_exhaustive_patterns_type_not_empty = non-exhaustive patterns: type `{$ty}` is non-empty
+    .def_note = `{$peeled_ty}` defined here
+    .type_note = the matched value is of type `{$ty}`
+    .non_exhaustive_type_note = the matched value is of type `{$ty}`, which is marked as non-exhaustive
+    .reference_note = references are always considered inhabited
+    .suggestion = ensure that all possible cases are being handled by adding a match arm with a wildcard pattern as shown
+    .help = ensure that all possible cases are being handled by adding a match arm with a wildcard pattern
+
+mir_build_static_in_pattern = statics cannot be referenced in patterns
+
+mir_build_assoc_const_in_pattern = associated consts cannot be referenced in patterns
+
+mir_build_const_param_in_pattern = const parameters cannot be referenced in patterns
+
+mir_build_non_const_path = runtime values cannot be referenced in patterns
+
+mir_build_unreachable_pattern = unreachable pattern
+    .label = unreachable pattern
+    .catchall_label = matches any value
+
+mir_build_const_pattern_depends_on_generic_parameter =
+    constant pattern depends on a generic parameter
+
+mir_build_could_not_eval_const_pattern = could not evaluate constant pattern
+
+mir_build_lower_range_bound_must_be_less_than_or_equal_to_upper =
+    lower range bound must be less than or equal to upper
+    .label = lower bound larger than upper bound
+    .teach_note = When matching against a range, the compiler verifies that the range is non-empty. Range patterns include both end-points, so this is equivalent to requiring the start of the range to be less than or equal to the end of the range.
+
+mir_build_literal_in_range_out_of_bounds =
+    literal out of range for `{$ty}`
+    .label = this value doesn't fit in `{$ty}` whose maximum value is `{$max}`
+
+mir_build_lower_range_bound_must_be_less_than_upper = lower range bound must be less than upper
+
+mir_build_leading_irrefutable_let_patterns = leading irrefutable {$count ->
+        [one] pattern
+        *[other] patterns
+    } in let chain
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match
+    .help = consider moving {$count ->
+        [one] it
+        *[other] them
+    } outside of the construct
+
+mir_build_trailing_irrefutable_let_patterns = trailing irrefutable {$count ->
+        [one] pattern
+        *[other] patterns
+    } in let chain
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match
+    .help = consider moving {$count ->
+        [one] it
+        *[other] them
+    } into the body
+
+mir_build_bindings_with_variant_name =
+    pattern binding `{$ident}` is named the same as one of the variants of the type `{$ty_path}`
+    .suggestion = to match on the variant, qualify the path
+
+mir_build_irrefutable_let_patterns_generic_let = irrefutable `let` {$count ->
+        [one] pattern
+        *[other] patterns
+    }
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match, so the `let` is useless
+    .help = consider removing `let`
+
+mir_build_irrefutable_let_patterns_if_let = irrefutable `if let` {$count ->
+        [one] pattern
+        *[other] patterns
+    }
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match, so the `if let` is useless
+    .help = consider replacing the `if let` with a `let`
+
+mir_build_irrefutable_let_patterns_if_let_guard = irrefutable `if let` guard {$count ->
+        [one] pattern
+        *[other] patterns
+    }
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match, so the guard is useless
+    .help = consider removing the guard and adding a `let` inside the match arm
+
+mir_build_irrefutable_let_patterns_let_else = irrefutable `let...else` {$count ->
+        [one] pattern
+        *[other] patterns
+    }
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match, so the `else` clause is useless
+    .help = consider removing the `else` clause
+
+mir_build_irrefutable_let_patterns_while_let = irrefutable `while let` {$count ->
+        [one] pattern
+        *[other] patterns
+    }
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match, so the loop will never exit
+    .help = consider instead using a `loop {"{"} ... {"}"}` with a `let` inside it
+
+mir_build_borrow_of_moved_value = borrow of moved value
+    .label = value moved into `{$name}` here
+    .occurs_because_label = move occurs because `{$name}` has type `{$ty}` which does not implement the `Copy` trait
+    .value_borrowed_label = value borrowed here after move
+    .suggestion = borrow this binding in the pattern to avoid moving the value
+
+mir_build_multiple_mut_borrows = cannot borrow value as mutable more than once at a time
+
+mir_build_already_borrowed = cannot borrow value as mutable because it is also borrowed as immutable
+
+mir_build_already_mut_borrowed = cannot borrow value as immutable because it is also borrowed as mutable
+
+mir_build_moved_while_borrowed = cannot move out of value because it is borrowed
+
+mir_build_mutable_borrow = value is mutably borrowed by `{$name}` here
+
+mir_build_borrow = value is borrowed by `{$name}` here
+
+mir_build_moved = value is moved into `{$name}` here
+
+mir_build_union_pattern = cannot use unions in constant patterns
+
+mir_build_type_not_structural =
+     to use a constant of type `{$non_sm_ty}` in a pattern, `{$non_sm_ty}` must be annotated with `#[derive(PartialEq, Eq)]`
+
+mir_build_unsized_pattern = cannot use unsized non-slice type `{$non_sm_ty}` in constant patterns
+
+mir_build_invalid_pattern = `{$non_sm_ty}` cannot be used in patterns
+
+mir_build_float_pattern = floating-point types cannot be used in patterns
+
+mir_build_pointer_pattern = function pointers and unsized pointers in patterns behave unpredictably and should not be relied upon. See https://github.com/rust-lang/rust/issues/70861 for details.
+
+mir_build_indirect_structural_match =
+    to use a constant of type `{$non_sm_ty}` in a pattern, `{$non_sm_ty}` must be annotated with `#[derive(PartialEq, Eq)]`
+
+mir_build_nontrivial_structural_match =
+    to use a constant of type `{$non_sm_ty}` in a pattern, the constant's initializer must be trivial or `{$non_sm_ty}` must be annotated with `#[derive(PartialEq, Eq)]`
+
+mir_build_overlapping_range_endpoints = multiple patterns overlap on their endpoints
+    .range = ... with this range
+    .note = you likely meant to write mutually exclusive ranges
+
+mir_build_non_exhaustive_omitted_pattern = some variants are not matched explicitly
+    .help = ensure that all variants are matched explicitly by adding the suggested match arms
+    .note = the matched value is of type `{$scrut_ty}` and the `non_exhaustive_omitted_patterns` attribute was found
+
+mir_build_uncovered = {$count ->
+        [1] pattern `{$witness_1}`
+        [2] patterns `{$witness_1}` and `{$witness_2}`
+        [3] patterns `{$witness_1}`, `{$witness_2}` and `{$witness_3}`
+        *[other] patterns `{$witness_1}`, `{$witness_2}`, `{$witness_3}` and {$remainder} more
+    } not covered
+
+mir_build_pattern_not_covered = refutable pattern in {$origin}
+    .pattern_ty = the matched value is of type `{$pattern_ty}`
+
+mir_build_inform_irrefutable = `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
+
+mir_build_more_information = for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+
+mir_build_res_defined_here = {$res} defined here
+
+mir_build_adt_defined_here = `{$ty}` defined here
+
+mir_build_variant_defined_here = not covered
+
+mir_build_interpreted_as_const = introduce a variable instead
+
+mir_build_confused = missing patterns are not covered because `{$variable}` is interpreted as {$article} {$res} pattern, not a new variable
+
+mir_build_suggest_if_let = you might want to use `if let` to ignore the {$count ->
+        [one] variant that isn't
+        *[other] variants that aren't
+    } matched
+
+mir_build_suggest_let_else = you might want to use `let else` to handle the {$count ->
+        [one] variant that isn't
+        *[other] variants that aren't
+    } matched
+
+mir_build_suggest_attempted_int_lit = alternatively, you could prepend the pattern with an underscore to define a new named variable; identifiers cannot begin with digits
diff --git a/compiler/rustc_mir_build/src/errors.rs b/compiler/rustc_mir_build/src/errors.rs
index ced251267d3..c1f6b8b59ce 100644
--- a/compiler/rustc_mir_build/src/errors.rs
+++ b/compiler/rustc_mir_build/src/errors.rs
@@ -1,9 +1,10 @@
-use crate::thir::pattern::deconstruct_pat::DeconstructedPat;
-use crate::thir::pattern::MatchCheckCtxt;
-use rustc_errors::Handler;
+use crate::{
+    fluent_generated as fluent,
+    thir::pattern::{deconstruct_pat::DeconstructedPat, MatchCheckCtxt},
+};
 use rustc_errors::{
     error_code, AddToDiagnostic, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed,
-    IntoDiagnostic, MultiSpan, SubdiagnosticMessage,
+    Handler, IntoDiagnostic, MultiSpan, SubdiagnosticMessage,
 };
 use rustc_hir::def::Res;
 use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
@@ -358,7 +359,7 @@ impl<'a> IntoDiagnostic<'a> for NonExhaustivePatternsTypeNotEmpty<'_, '_, '_> {
     fn into_diagnostic(self, handler: &'a Handler) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
         let mut diag = handler.struct_span_err_with_code(
             self.span,
-            rustc_errors::fluent::mir_build_non_exhaustive_patterns_type_not_empty,
+            fluent::mir_build_non_exhaustive_patterns_type_not_empty,
             error_code!(E0004),
         );
 
@@ -380,7 +381,7 @@ impl<'a> IntoDiagnostic<'a> for NonExhaustivePatternsTypeNotEmpty<'_, '_, '_> {
             let mut span: MultiSpan = def_span.into();
             span.push_span_label(def_span, "");
 
-            diag.span_note(span, rustc_errors::fluent::def_note);
+            diag.span_note(span, fluent::mir_build_def_note);
         }
 
         let is_variant_list_non_exhaustive = match self.ty.kind() {
@@ -391,14 +392,14 @@ impl<'a> IntoDiagnostic<'a> for NonExhaustivePatternsTypeNotEmpty<'_, '_, '_> {
         };
 
         if is_variant_list_non_exhaustive {
-            diag.note(rustc_errors::fluent::non_exhaustive_type_note);
+            diag.note(fluent::mir_build_non_exhaustive_type_note);
         } else {
-            diag.note(rustc_errors::fluent::type_note);
+            diag.note(fluent::mir_build_type_note);
         }
 
         if let ty::Ref(_, sub_ty, _) = self.ty.kind() {
             if !sub_ty.is_inhabited_from(self.cx.tcx, self.cx.module, self.cx.param_env) {
-                diag.note(rustc_errors::fluent::reference_note);
+                diag.note(fluent::mir_build_reference_note);
             }
         }
 
@@ -424,12 +425,12 @@ impl<'a> IntoDiagnostic<'a> for NonExhaustivePatternsTypeNotEmpty<'_, '_, '_> {
         if let Some((span, sugg)) = suggestion {
             diag.span_suggestion_verbose(
                 span,
-                rustc_errors::fluent::suggestion,
+                fluent::mir_build_suggestion,
                 sugg,
                 Applicability::HasPlaceholders,
             );
         } else {
-            diag.help(rustc_errors::fluent::help);
+            diag.help(fluent::mir_build_help);
         }
 
         diag
@@ -469,7 +470,7 @@ pub struct NonConstPath {
 pub struct UnreachablePattern {
     #[label]
     pub span: Option<Span>,
-    #[label(catchall_label)]
+    #[label(mir_build_catchall_label)]
     pub catchall: Option<Span>,
 }
 
@@ -493,7 +494,7 @@ pub struct LowerRangeBoundMustBeLessThanOrEqualToUpper {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[note(teach_note)]
+    #[note(mir_build_teach_note)]
     pub teach: Option<()>,
 }
 
@@ -585,9 +586,9 @@ pub struct BorrowOfMovedValue<'tcx> {
     #[primary_span]
     pub span: Span,
     #[label]
-    #[label(occurs_because_label)]
+    #[label(mir_build_occurs_because_label)]
     pub binding_span: Span,
-    #[label(value_borrowed_label)]
+    #[label(mir_build_value_borrowed_label)]
     pub conflicts_ref: Vec<Span>,
     pub name: Ident,
     pub ty: Ty<'tcx>,
@@ -708,7 +709,7 @@ pub struct NontrivialStructuralMatch<'tcx> {
 #[diag(mir_build_overlapping_range_endpoints)]
 #[note]
 pub struct OverlappingRangeEndpoints<'tcx> {
-    #[label(range)]
+    #[label(mir_build_range)]
     pub range: Span,
     #[subdiagnostic]
     pub overlap: Vec<Overlap<'tcx>>,
@@ -788,7 +789,7 @@ pub(crate) struct PatternNotCovered<'s, 'tcx> {
     pub interpreted_as_const: Option<InterpretedAsConst>,
     #[subdiagnostic]
     pub adt_defined_here: Option<AdtDefinedHere<'tcx>>,
-    #[note(pattern_ty)]
+    #[note(mir_build_pattern_ty)]
     pub _p: (),
     pub pattern_ty: Ty<'tcx>,
     #[subdiagnostic]
@@ -823,10 +824,10 @@ impl<'tcx> AddToDiagnostic for AdtDefinedHere<'tcx> {
         let mut spans = MultiSpan::from(self.adt_def_span);
 
         for Variant { span } in self.variants {
-            spans.push_span_label(span, rustc_errors::fluent::mir_build_variant_defined_here);
+            spans.push_span_label(span, fluent::mir_build_variant_defined_here);
         }
 
-        diag.span_note(spans, rustc_errors::fluent::mir_build_adt_defined_here);
+        diag.span_note(spans, fluent::mir_build_adt_defined_here);
     }
 }
 
diff --git a/compiler/rustc_mir_build/src/lib.rs b/compiler/rustc_mir_build/src/lib.rs
index 94dae36154c..fbc130501f9 100644
--- a/compiler/rustc_mir_build/src/lib.rs
+++ b/compiler/rustc_mir_build/src/lib.rs
@@ -25,6 +25,11 @@ pub mod thir;
 
 use rustc_middle::ty::query::Providers;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
+fluent_messages! { "../locales/en-US.ftl" }
+
 pub fn provide(providers: &mut Providers) {
     providers.check_match = thir::pattern::check_match;
     providers.lit_to_const = thir::constant::lit_to_const;
diff --git a/compiler/rustc_mir_dataflow/locales/en-US.ftl b/compiler/rustc_mir_dataflow/locales/en-US.ftl
new file mode 100644
index 00000000000..98854152508
--- /dev/null
+++ b/compiler/rustc_mir_dataflow/locales/en-US.ftl
@@ -0,0 +1,29 @@
+mir_dataflow_path_must_end_in_filename =
+    path must end in a filename
+
+mir_dataflow_unknown_formatter =
+    unknown formatter
+
+mir_dataflow_duplicate_values_for =
+    duplicate values for `{$name}`
+
+mir_dataflow_requires_an_argument =
+    `{$name}` requires an argument
+
+mir_dataflow_stop_after_dataflow_ended_compilation =
+    stop_after_dataflow ended compilation
+
+mir_dataflow_peek_must_be_place_or_ref_place =
+    rustc_peek: argument expression must be either `place` or `&place`
+
+mir_dataflow_peek_must_be_not_temporary =
+    dataflow::sanity_check cannot feed a non-temp to rustc_peek
+
+mir_dataflow_peek_bit_not_set =
+    rustc_peek: bit not set
+
+mir_dataflow_peek_argument_not_a_local =
+    rustc_peek: argument was not a local
+
+mir_dataflow_peek_argument_untracked =
+    rustc_peek: argument untracked
diff --git a/compiler/rustc_mir_dataflow/src/lib.rs b/compiler/rustc_mir_dataflow/src/lib.rs
index 3e382f500af..b1e03faff05 100644
--- a/compiler/rustc_mir_dataflow/src/lib.rs
+++ b/compiler/rustc_mir_dataflow/src/lib.rs
@@ -16,7 +16,9 @@ extern crate tracing;
 extern crate rustc_middle;
 
 use rustc_ast::MetaItem;
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_hir::def_id::DefId;
+use rustc_macros::fluent_messages;
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_span::symbol::{sym, Symbol};
 
@@ -44,6 +46,8 @@ pub mod storage;
 pub mod un_derefer;
 pub mod value_analysis;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 pub(crate) mod indexes {
     pub(crate) use super::move_paths::MovePathIndex;
 }
diff --git a/compiler/rustc_monomorphize/locales/en-US.ftl b/compiler/rustc_monomorphize/locales/en-US.ftl
new file mode 100644
index 00000000000..6cea6a603f3
--- /dev/null
+++ b/compiler/rustc_monomorphize/locales/en-US.ftl
@@ -0,0 +1,32 @@
+monomorphize_recursion_limit =
+    reached the recursion limit while instantiating `{$shrunk}`
+    .note = `{$def_path_str}` defined here
+
+monomorphize_written_to_path = the full type name has been written to '{$path}'
+
+monomorphize_type_length_limit = reached the type-length limit while instantiating `{$shrunk}`
+
+monomorphize_consider_type_length_limit =
+    consider adding a `#![type_length_limit="{$type_length}"]` attribute to your crate
+
+monomorphize_fatal_error = {$error_message}
+
+monomorphize_unknown_partition_strategy = unknown partitioning strategy
+
+monomorphize_symbol_already_defined = symbol `{$symbol}` is already defined
+
+monomorphize_unused_generic_params = item has unused generic parameters
+
+monomorphize_large_assignments =
+    moving {$size} bytes
+    .label = value moved from here
+    .note = The current maximum size is {$limit}, but it can be customized with the move_size_limit attribute: `#![move_size_limit = "..."]`
+
+monomorphize_couldnt_dump_mono_stats =
+    unexpected error occurred while dumping monomorphization stats: {$error}
+
+monomorphize_encountered_error_while_instantiating =
+    the above error was encountered while instantiating `{$formatted_item}`
+
+monomorphize_unknown_cgu_collection_mode =
+    unknown codegen-item collection mode '{$mode}', falling back to 'lazy' mode
diff --git a/compiler/rustc_monomorphize/src/errors.rs b/compiler/rustc_monomorphize/src/errors.rs
index a53bd7e1fef..495a73490a2 100644
--- a/compiler/rustc_monomorphize/src/errors.rs
+++ b/compiler/rustc_monomorphize/src/errors.rs
@@ -1,5 +1,6 @@
 use std::path::PathBuf;
 
+use crate::fluent_generated as fluent;
 use rustc_errors::ErrorGuaranteed;
 use rustc_errors::IntoDiagnostic;
 use rustc_macros::{Diagnostic, LintDiagnostic};
@@ -44,7 +45,7 @@ impl IntoDiagnostic<'_> for UnusedGenericParamsHint {
         self,
         handler: &'_ rustc_errors::Handler,
     ) -> rustc_errors::DiagnosticBuilder<'_, ErrorGuaranteed> {
-        let mut diag = handler.struct_err(rustc_errors::fluent::monomorphize_unused_generic_params);
+        let mut diag = handler.struct_err(fluent::monomorphize_unused_generic_params);
         diag.set_span(self.span);
         for (span, name) in self.param_spans.into_iter().zip(self.param_names) {
             // FIXME: I can figure out how to do a label with a fluent string with a fixed message,
diff --git a/compiler/rustc_monomorphize/src/lib.rs b/compiler/rustc_monomorphize/src/lib.rs
index f88155e4fc7..f6b791f29c1 100644
--- a/compiler/rustc_monomorphize/src/lib.rs
+++ b/compiler/rustc_monomorphize/src/lib.rs
@@ -9,7 +9,9 @@ extern crate tracing;
 #[macro_use]
 extern crate rustc_middle;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_hir::lang_items::LangItem;
+use rustc_macros::fluent_messages;
 use rustc_middle::traits;
 use rustc_middle::ty::adjustment::CustomCoerceUnsized;
 use rustc_middle::ty::query::{Providers, TyCtxtAt};
@@ -21,6 +23,8 @@ mod partitioning;
 mod polymorphize;
 mod util;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 fn custom_coerce_unsize_info<'tcx>(
     tcx: TyCtxtAt<'tcx>,
     source_ty: Ty<'tcx>,
diff --git a/compiler/rustc_parse/locales/en-US.ftl b/compiler/rustc_parse/locales/en-US.ftl
new file mode 100644
index 00000000000..a31b1f6ac1a
--- /dev/null
+++ b/compiler/rustc_parse/locales/en-US.ftl
@@ -0,0 +1,730 @@
+parse_struct_literal_body_without_path =
+    struct literal body without path
+    .suggestion = you might have forgotten to add the struct literal inside the block
+
+parse_struct_literal_needing_parens =
+    invalid struct literal
+    .suggestion = you might need to surround the struct literal in parentheses
+
+parse_maybe_report_ambiguous_plus =
+    ambiguous `+` in a type
+    .suggestion = use parentheses to disambiguate
+
+parse_maybe_recover_from_bad_type_plus =
+    expected a path on the left-hand side of `+`, not `{$ty}`
+
+parse_add_paren = try adding parentheses
+
+parse_forgot_paren = perhaps you forgot parentheses?
+
+parse_expect_path = expected a path
+
+parse_maybe_recover_from_bad_qpath_stage_2 =
+    missing angle brackets in associated item path
+    .suggestion = try: `{$ty}`
+
+parse_incorrect_semicolon =
+    expected item, found `;`
+    .suggestion = remove this semicolon
+    .help = {$name} declarations are not followed by a semicolon
+
+parse_incorrect_use_of_await =
+    incorrect use of `await`
+    .parentheses_suggestion = `await` is not a method call, remove the parentheses
+    .postfix_suggestion = `await` is a postfix operation
+
+parse_in_in_typo =
+    expected iterable, found keyword `in`
+    .suggestion = remove the duplicated `in`
+
+parse_invalid_variable_declaration =
+    invalid variable declaration
+
+parse_switch_mut_let_order =
+    switch the order of `mut` and `let`
+parse_missing_let_before_mut = missing keyword
+parse_use_let_not_auto = write `let` instead of `auto` to introduce a new variable
+parse_use_let_not_var = write `let` instead of `var` to introduce a new variable
+
+parse_invalid_comparison_operator = invalid comparison operator `{$invalid}`
+    .use_instead = `{$invalid}` is not a valid comparison operator, use `{$correct}`
+    .spaceship_operator_invalid = `<=>` is not a valid comparison operator, use `std::cmp::Ordering`
+
+parse_invalid_logical_operator = `{$incorrect}` is not a logical operator
+    .note = unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
+    .use_amp_amp_for_conjunction = use `&&` to perform logical conjunction
+    .use_pipe_pipe_for_disjunction = use `||` to perform logical disjunction
+
+parse_tilde_is_not_unary_operator = `~` cannot be used as a unary operator
+    .suggestion = use `!` to perform bitwise not
+
+parse_unexpected_if_with_if = unexpected `if` in the condition expression
+    .suggestion = remove the `if`
+
+parse_unexpected_token_after_not = unexpected {$negated_desc} after identifier
+parse_unexpected_token_after_not_bitwise = use `!` to perform bitwise not
+parse_unexpected_token_after_not_logical = use `!` to perform logical negation
+parse_unexpected_token_after_not_default = use `!` to perform logical negation or bitwise not
+
+parse_malformed_loop_label = malformed loop label
+    .suggestion = use the correct loop label format
+
+parse_lifetime_in_borrow_expression = borrow expressions cannot be annotated with lifetimes
+    .suggestion = remove the lifetime annotation
+    .label = annotated with lifetime here
+
+parse_field_expression_with_generic = field expressions cannot have generic arguments
+
+parse_macro_invocation_with_qualified_path = macros cannot use qualified paths
+
+parse_unexpected_token_after_label = expected `while`, `for`, `loop` or `{"{"}` after a label
+    .suggestion_remove_label = consider removing the label
+    .suggestion_enclose_in_block = consider enclosing expression in a block
+
+parse_require_colon_after_labeled_expression = labeled expression must be followed by `:`
+    .note = labels are used before loops and blocks, allowing e.g., `break 'label` to them
+    .label = the label
+    .suggestion = add `:` after the label
+
+parse_do_catch_syntax_removed = found removed `do catch` syntax
+    .note = following RFC #2388, the new non-placeholder syntax is `try`
+    .suggestion = replace with the new syntax
+
+parse_float_literal_requires_integer_part = float literals must have an integer part
+    .suggestion = must have an integer part
+
+parse_invalid_int_literal_width = invalid width `{$width}` for integer literal
+    .help = valid widths are 8, 16, 32, 64 and 128
+
+parse_invalid_num_literal_base_prefix = invalid base prefix for number literal
+    .note = base prefixes (`0xff`, `0b1010`, `0o755`) are lowercase
+    .suggestion = try making the prefix lowercase
+
+parse_invalid_num_literal_suffix = invalid suffix `{$suffix}` for number literal
+    .label = invalid suffix `{$suffix}`
+    .help = the suffix must be one of the numeric types (`u32`, `isize`, `f32`, etc.)
+
+parse_invalid_float_literal_width = invalid width `{$width}` for float literal
+    .help = valid widths are 32 and 64
+
+parse_invalid_float_literal_suffix = invalid suffix `{$suffix}` for float literal
+    .label = invalid suffix `{$suffix}`
+    .help = valid suffixes are `f32` and `f64`
+
+parse_int_literal_too_large = integer literal is too large
+
+parse_missing_semicolon_before_array = expected `;`, found `[`
+    .suggestion = consider adding `;` here
+
+parse_invalid_block_macro_segment = cannot use a `block` macro fragment here
+    .label = the `block` fragment is within this context
+
+parse_expect_dotdot_not_dotdotdot = expected `..`, found `...`
+    .suggestion = use `..` to fill in the rest of the fields
+
+parse_if_expression_missing_then_block = this `if` expression is missing a block after the condition
+    .add_then_block = add a block here
+    .condition_possibly_unfinished = this binary operation is possibly unfinished
+
+parse_if_expression_missing_condition = missing condition for `if` expression
+    .condition_label = expected condition here
+    .block_label = if this block is the condition of the `if` expression, then it must be followed by another block
+
+parse_expected_expression_found_let = expected expression, found `let` statement
+
+parse_expect_eq_instead_of_eqeq = expected `=`, found `==`
+    .suggestion = consider using `=` here
+
+parse_expected_else_block = expected `{"{"}`, found {$first_tok}
+    .label = expected an `if` or a block after this `else`
+    .suggestion = add an `if` if this is the condition of a chained `else if` statement
+
+parse_outer_attribute_not_allowed_on_if_else = outer attributes are not allowed on `if` and `else` branches
+    .branch_label = the attributes are attached to this branch
+    .ctx_label = the branch belongs to this `{$ctx}`
+    .suggestion = remove the attributes
+
+parse_missing_in_in_for_loop = missing `in` in `for` loop
+    .use_in_not_of = try using `in` here instead
+    .add_in = try adding `in` here
+
+parse_missing_expression_in_for_loop = missing expression to iterate on in `for` loop
+    .suggestion = try adding an expression to the `for` loop
+
+parse_missing_comma_after_match_arm = expected `,` following `match` arm
+    .suggestion = missing a comma here to end this `match` arm
+
+parse_catch_after_try = keyword `catch` cannot follow a `try` block
+    .help = try using `match` on the result of the `try` block instead
+
+parse_comma_after_base_struct = cannot use a comma after the base struct
+    .note = the base struct must always be the last field
+    .suggestion = remove this comma
+
+parse_eq_field_init = expected `:`, found `=`
+    .suggestion = replace equals symbol with a colon
+
+parse_dotdotdot = unexpected token: `...`
+    .suggest_exclusive_range = use `..` for an exclusive range
+    .suggest_inclusive_range = or `..=` for an inclusive range
+
+parse_left_arrow_operator = unexpected token: `<-`
+    .suggestion = if you meant to write a comparison against a negative value, add a space in between `<` and `-`
+
+parse_remove_let = expected pattern, found `let`
+    .suggestion = remove the unnecessary `let` keyword
+
+parse_use_eq_instead = unexpected `==`
+    .suggestion = try using `=` instead
+
+parse_use_empty_block_not_semi = expected { "`{}`" }, found `;`
+    .suggestion = try using { "`{}`" } instead
+
+parse_comparison_interpreted_as_generic =
+    `<` is interpreted as a start of generic arguments for `{$type}`, not a comparison
+    .label_args = interpreted as generic arguments
+    .label_comparison = not interpreted as comparison
+    .suggestion = try comparing the cast value
+
+parse_shift_interpreted_as_generic =
+    `<<` is interpreted as a start of generic arguments for `{$type}`, not a shift
+    .label_args = interpreted as generic arguments
+    .label_comparison = not interpreted as shift
+    .suggestion = try shifting the cast value
+
+parse_found_expr_would_be_stmt = expected expression, found `{$token}`
+    .label = expected expression
+
+parse_leading_plus_not_supported = leading `+` is not supported
+    .label = unexpected `+`
+    .suggestion_remove_plus = try removing the `+`
+
+parse_parentheses_with_struct_fields = invalid `struct` delimiters or `fn` call arguments
+    .suggestion_braces_for_struct = if `{$type}` is a struct, use braces as delimiters
+    .suggestion_no_fields_for_fn = if `{$type}` is a function, use the arguments directly
+
+parse_labeled_loop_in_break = parentheses are required around this expression to avoid confusion with a labeled break expression
+
+parse_sugg_wrap_expression_in_parentheses = wrap the expression in parentheses
+
+parse_array_brackets_instead_of_braces = this is a block expression, not an array
+    .suggestion = to make an array, use square brackets instead of curly braces
+
+parse_match_arm_body_without_braces = `match` arm body without braces
+    .label_statements = {$num_statements ->
+            [one] this statement is not surrounded by a body
+           *[other] these statements are not surrounded by a body
+        }
+    .label_arrow = while parsing the `match` arm starting here
+    .suggestion_add_braces = surround the {$num_statements ->
+            [one] statement
+           *[other] statements
+        } with a body
+    .suggestion_use_comma_not_semicolon = use a comma to end a `match` arm expression
+
+parse_inclusive_range_extra_equals = unexpected `=` after inclusive range
+    .suggestion_remove_eq = use `..=` instead
+    .note = inclusive ranges end with a single equals sign (`..=`)
+
+parse_inclusive_range_match_arrow = unexpected `>` after inclusive range
+    .label = this is parsed as an inclusive range `..=`
+    .suggestion = add a space between the pattern and `=>`
+
+parse_inclusive_range_no_end = inclusive range with no end
+    .suggestion_open_range = use `..` instead
+    .note = inclusive ranges must be bounded at the end (`..=b` or `a..=b`)
+
+parse_struct_literal_not_allowed_here = struct literals are not allowed here
+    .suggestion = surround the struct literal with parentheses
+
+parse_invalid_interpolated_expression = invalid interpolated expression
+
+parse_hexadecimal_float_literal_not_supported = hexadecimal float literal is not supported
+parse_octal_float_literal_not_supported = octal float literal is not supported
+parse_binary_float_literal_not_supported = binary float literal is not supported
+parse_not_supported = not supported
+
+parse_invalid_literal_suffix = suffixes on {$kind} literals are invalid
+    .label = invalid suffix `{$suffix}`
+
+parse_invalid_literal_suffix_on_tuple_index = suffixes on a tuple index are invalid
+    .label = invalid suffix `{$suffix}`
+    .tuple_exception_line_1 = `{$suffix}` is *temporarily* accepted on tuple index fields as it was incorrectly accepted on stable for a few releases
+    .tuple_exception_line_2 = on proc macros, you'll want to use `syn::Index::from` or `proc_macro::Literal::*_unsuffixed` for code that will desugar to tuple field access
+    .tuple_exception_line_3 = see issue #60210 <https://github.com/rust-lang/rust/issues/60210> for more information
+
+parse_non_string_abi_literal = non-string ABI literal
+    .suggestion = specify the ABI with a string literal
+
+parse_mismatched_closing_delimiter = mismatched closing delimiter: `{$delimiter}`
+    .label_unmatched = mismatched closing delimiter
+    .label_opening_candidate = closing delimiter possibly meant for this
+    .label_unclosed = unclosed delimiter
+
+parse_incorrect_visibility_restriction = incorrect visibility restriction
+    .help = some possible visibility restrictions are:
+            `pub(crate)`: visible only on the current crate
+            `pub(super)`: visible only in the current module's parent
+            `pub(in path::to::module)`: visible only on the specified path
+    .suggestion = make this visible only to module `{$inner_str}` with `in`
+
+parse_assignment_else_not_allowed = <assignment> ... else {"{"} ... {"}"} is not allowed
+
+parse_expected_statement_after_outer_attr = expected statement after outer attribute
+
+parse_doc_comment_does_not_document_anything = found a documentation comment that doesn't document anything
+    .help = doc comments must come before what they document, if a comment was intended use `//`
+    .suggestion = missing comma here
+
+parse_const_let_mutually_exclusive = `const` and `let` are mutually exclusive
+    .suggestion = remove `let`
+
+parse_invalid_expression_in_let_else = a `{$operator}` expression cannot be directly assigned in `let...else`
+parse_invalid_curly_in_let_else = right curly brace `{"}"}` before `else` in a `let...else` statement not allowed
+parse_extra_if_in_let_else = remove the `if` if you meant to write a `let...else` statement
+
+parse_compound_assignment_expression_in_let = can't reassign to an uninitialized variable
+    .suggestion = initialize the variable
+    .help = if you meant to overwrite, remove the `let` binding
+
+parse_suffixed_literal_in_attribute = suffixed literals are not allowed in attributes
+    .help = instead of using a suffixed literal (`1u8`, `1.0f32`, etc.), use an unsuffixed version (`1`, `1.0`, etc.)
+
+parse_invalid_meta_item = expected unsuffixed literal or identifier, found `{$token}`
+
+parse_label_inner_attr_does_not_annotate_this = the inner attribute doesn't annotate this {$item}
+parse_sugg_change_inner_attr_to_outer = to annotate the {$item}, change the attribute from inner to outer style
+
+parse_inner_attr_not_permitted_after_outer_doc_comment = an inner attribute is not permitted following an outer doc comment
+    .label_attr = not permitted following an outer doc comment
+    .label_prev_doc_comment = previous doc comment
+    .label_does_not_annotate_this = {parse_label_inner_attr_does_not_annotate_this}
+    .sugg_change_inner_to_outer = {parse_sugg_change_inner_attr_to_outer}
+
+parse_inner_attr_not_permitted_after_outer_attr = an inner attribute is not permitted following an outer attribute
+    .label_attr = not permitted following an outer attribute
+    .label_prev_attr = previous outer attribute
+    .label_does_not_annotate_this = {parse_label_inner_attr_does_not_annotate_this}
+    .sugg_change_inner_to_outer = {parse_sugg_change_inner_attr_to_outer}
+
+parse_inner_attr_not_permitted = an inner attribute is not permitted in this context
+    .label_does_not_annotate_this = {parse_label_inner_attr_does_not_annotate_this}
+    .sugg_change_inner_to_outer = {parse_sugg_change_inner_attr_to_outer}
+
+parse_inner_attr_explanation = inner attributes, like `#![no_std]`, annotate the item enclosing them, and are usually found at the beginning of source files
+parse_outer_attr_explanation = outer attributes, like `#[test]`, annotate the item following them
+
+parse_inner_doc_comment_not_permitted = expected outer doc comment
+    .note = inner doc comments like this (starting with `//!` or `/*!`) can only appear before items
+    .suggestion = you might have meant to write a regular comment
+    .label_does_not_annotate_this = the inner doc comment doesn't annotate this {$item}
+    .sugg_change_inner_to_outer = to annotate the {$item}, change the doc comment from inner to outer style
+
+parse_expected_identifier_found_reserved_identifier_str = expected identifier, found reserved identifier `{$token}`
+parse_expected_identifier_found_keyword_str = expected identifier, found keyword `{$token}`
+parse_expected_identifier_found_reserved_keyword_str = expected identifier, found reserved keyword `{$token}`
+parse_expected_identifier_found_doc_comment_str = expected identifier, found doc comment `{$token}`
+parse_expected_identifier_found_str = expected identifier, found `{$token}`
+
+parse_expected_identifier_found_reserved_identifier = expected identifier, found reserved identifier
+parse_expected_identifier_found_keyword = expected identifier, found keyword
+parse_expected_identifier_found_reserved_keyword = expected identifier, found reserved keyword
+parse_expected_identifier_found_doc_comment = expected identifier, found doc comment
+parse_expected_identifier = expected identifier
+
+parse_sugg_escape_to_use_as_identifier = escape `{$ident_name}` to use it as an identifier
+
+parse_sugg_remove_comma = remove this comma
+
+parse_expected_semi_found_reserved_identifier_str = expected `;`, found reserved identifier `{$token}`
+parse_expected_semi_found_keyword_str = expected `;`, found keyword `{$token}`
+parse_expected_semi_found_reserved_keyword_str = expected `;`, found reserved keyword `{$token}`
+parse_expected_semi_found_doc_comment_str = expected `;`, found doc comment `{$token}`
+parse_expected_semi_found_str = expected `;`, found `{$token}`
+
+parse_sugg_change_this_to_semi = change this to `;`
+parse_sugg_add_semi = add `;` here
+parse_label_unexpected_token = unexpected token
+
+parse_unmatched_angle_brackets = {$num_extra_brackets ->
+        [one] unmatched angle bracket
+       *[other] unmatched angle brackets
+    }
+    .suggestion = {$num_extra_brackets ->
+            [one] remove extra angle bracket
+           *[other] remove extra angle brackets
+        }
+
+parse_generic_parameters_without_angle_brackets = generic parameters without surrounding angle brackets
+    .suggestion = surround the type parameters with angle brackets
+
+parse_comparison_operators_cannot_be_chained = comparison operators cannot be chained
+    .sugg_parentheses_for_function_args = or use `(...)` if you meant to specify fn arguments
+    .sugg_split_comparison = split the comparison into two
+    .sugg_parenthesize = parenthesize the comparison
+parse_sugg_turbofish_syntax = use `::<...>` instead of `<...>` to specify lifetime, type, or const arguments
+
+parse_question_mark_in_type = invalid `?` in type
+    .label = `?` is only allowed on expressions, not types
+    .suggestion = if you meant to express that the type might not contain a value, use the `Option` wrapper type
+
+parse_unexpected_parentheses_in_for_head = unexpected parentheses surrounding `for` loop head
+    .suggestion = remove parentheses in `for` loop
+
+parse_doc_comment_on_param_type = documentation comments cannot be applied to a function parameter's type
+    .label = doc comments are not allowed here
+
+parse_attribute_on_param_type = attributes cannot be applied to a function parameter's type
+    .label = attributes are not allowed here
+
+parse_pattern_method_param_without_body = patterns aren't allowed in methods without bodies
+    .suggestion = give this argument a name or use an underscore to ignore it
+
+parse_self_param_not_first = unexpected `self` parameter in function
+    .label = must be the first parameter of an associated function
+
+parse_const_generic_without_braces = expressions must be enclosed in braces to be used as const generic arguments
+    .suggestion = enclose the `const` expression in braces
+
+parse_unexpected_const_param_declaration = unexpected `const` parameter declaration
+    .label = expected a `const` expression, not a parameter declaration
+    .suggestion = `const` parameters must be declared for the `impl`
+
+parse_unexpected_const_in_generic_param = expected lifetime, type, or constant, found keyword `const`
+    .suggestion = the `const` keyword is only needed in the definition of the type
+
+parse_async_move_order_incorrect = the order of `move` and `async` is incorrect
+    .suggestion = try switching the order
+
+parse_double_colon_in_bound = expected `:` followed by trait or lifetime
+    .suggestion = use single colon
+
+parse_fn_ptr_with_generics = function pointer types may not have generic parameters
+    .suggestion = consider moving the lifetime {$arity ->
+        [one] parameter
+        *[other] parameters
+    } to {$for_param_list_exists ->
+        [true] the
+        *[false] a
+    } `for` parameter list
+
+parse_invalid_identifier_with_leading_number = expected identifier, found number literal
+    .label = identifiers cannot start with a number
+
+parse_maybe_fn_typo_with_impl = you might have meant to write `impl` instead of `fn`
+    .suggestion = replace `fn` with `impl` here
+
+parse_expected_fn_path_found_fn_keyword = expected identifier, found keyword `fn`
+    .suggestion = use `Fn` to refer to the trait
+
+parse_where_clause_before_tuple_struct_body = where clauses are not allowed before tuple struct bodies
+    .label = unexpected where clause
+    .name_label = while parsing this tuple struct
+    .body_label = the struct body
+    .suggestion = move the body before the where clause
+
+parse_async_fn_in_2015 = `async fn` is not permitted in Rust 2015
+    .label = to use `async fn`, switch to Rust 2018 or later
+
+parse_async_block_in_2015 = `async` blocks are only allowed in Rust 2018 or later
+
+parse_self_argument_pointer = cannot pass `self` by raw pointer
+    .label = cannot pass `self` by raw pointer
+
+parse_visibility_not_followed_by_item = visibility `{$vis}` is not followed by an item
+    .label = the visibility
+    .help = you likely meant to define an item, e.g., `{$vis} fn foo() {"{}"}`
+
+parse_default_not_followed_by_item = `default` is not followed by an item
+    .label = the `default` qualifier
+    .note = only `fn`, `const`, `type`, or `impl` items may be prefixed by `default`
+
+parse_missing_struct_for_struct_definition = missing `struct` for struct definition
+    .suggestion = add `struct` here to parse `{$ident}` as a public struct
+
+parse_missing_fn_for_function_definition = missing `fn` for function definition
+    .suggestion = add `fn` here to parse `{$ident}` as a public function
+
+parse_missing_fn_for_method_definition = missing `fn` for method definition
+    .suggestion = add `fn` here to parse `{$ident}` as a public method
+
+parse_ambiguous_missing_keyword_for_item_definition = missing `fn` or `struct` for function or struct definition
+    .suggestion = if you meant to call a macro, try
+    .help = if you meant to call a macro, remove the `pub` and add a trailing `!` after the identifier
+
+parse_missing_trait_in_trait_impl = missing trait in a trait impl
+    .suggestion_add_trait = add a trait here
+    .suggestion_remove_for = for an inherent impl, drop this `for`
+
+parse_missing_for_in_trait_impl = missing `for` in a trait impl
+    .suggestion = add `for` here
+
+parse_expected_trait_in_trait_impl_found_type = expected a trait, found type
+
+parse_non_item_in_item_list = non-item in item list
+    .suggestion_use_const_not_let = consider using `const` instead of `let` for associated const
+    .label_list_start = item list starts here
+    .label_non_item = non-item starts here
+    .label_list_end = item list ends here
+    .suggestion_remove_semicolon = consider removing this semicolon
+
+parse_bounds_not_allowed_on_trait_aliases = bounds are not allowed on trait aliases
+
+parse_trait_alias_cannot_be_auto = trait aliases cannot be `auto`
+parse_trait_alias_cannot_be_unsafe = trait aliases cannot be `unsafe`
+
+parse_associated_static_item_not_allowed = associated `static` items are not allowed
+
+parse_extern_crate_name_with_dashes = crate name using dashes are not valid in `extern crate` statements
+    .label = dash-separated idents are not valid
+    .suggestion = if the original crate name uses dashes you need to use underscores in the code
+
+parse_extern_item_cannot_be_const = extern items cannot be `const`
+    .suggestion = try using a static value
+    .note = for more information, visit https://doc.rust-lang.org/std/keyword.extern.html
+
+parse_const_global_cannot_be_mutable = const globals cannot be mutable
+    .label = cannot be mutable
+    .suggestion = you might want to declare a static instead
+
+parse_missing_const_type = missing type for `{$kind}` item
+    .suggestion = provide a type for the item
+
+parse_enum_struct_mutually_exclusive = `enum` and `struct` are mutually exclusive
+    .suggestion = replace `enum struct` with
+
+parse_unexpected_token_after_struct_name = expected `where`, `{"{"}`, `(`, or `;` after struct name
+parse_unexpected_token_after_struct_name_found_reserved_identifier = expected `where`, `{"{"}`, `(`, or `;` after struct name, found reserved identifier `{$token}`
+parse_unexpected_token_after_struct_name_found_keyword = expected `where`, `{"{"}`, `(`, or `;` after struct name, found keyword `{$token}`
+parse_unexpected_token_after_struct_name_found_reserved_keyword = expected `where`, `{"{"}`, `(`, or `;` after struct name, found reserved keyword `{$token}`
+parse_unexpected_token_after_struct_name_found_doc_comment = expected `where`, `{"{"}`, `(`, or `;` after struct name, found doc comment `{$token}`
+parse_unexpected_token_after_struct_name_found_other = expected `where`, `{"{"}`, `(`, or `;` after struct name, found `{$token}`
+
+parse_unexpected_self_in_generic_parameters = unexpected keyword `Self` in generic parameters
+    .note = you cannot use `Self` as a generic parameter because it is reserved for associated items
+
+parse_unexpected_default_value_for_lifetime_in_generic_parameters = unexpected default lifetime parameter
+    .label = lifetime parameters cannot have default values
+
+parse_multiple_where_clauses = cannot define duplicate `where` clauses on an item
+    .label = previous `where` clause starts here
+    .suggestion = consider joining the two `where` clauses into one
+
+parse_nonterminal_expected_item_keyword = expected an item keyword
+parse_nonterminal_expected_statement = expected a statement
+parse_nonterminal_expected_ident = expected ident, found `{$token}`
+parse_nonterminal_expected_lifetime = expected a lifetime, found `{$token}`
+
+parse_or_pattern_not_allowed_in_let_binding = top-level or-patterns are not allowed in `let` bindings
+parse_or_pattern_not_allowed_in_fn_parameters = top-level or-patterns are not allowed in function parameters
+parse_sugg_remove_leading_vert_in_pattern = remove the `|`
+parse_sugg_wrap_pattern_in_parens = wrap the pattern in parentheses
+
+parse_note_pattern_alternatives_use_single_vert = alternatives in or-patterns are separated with `|`, not `||`
+
+parse_unexpected_vert_vert_before_function_parameter = unexpected `||` before function parameter
+    .suggestion = remove the `||`
+
+parse_label_while_parsing_or_pattern_here = while parsing this or-pattern starting here
+
+parse_unexpected_vert_vert_in_pattern = unexpected token `||` in pattern
+    .suggestion = use a single `|` to separate multiple alternative patterns
+
+parse_trailing_vert_not_allowed = a trailing `|` is not allowed in an or-pattern
+    .suggestion = remove the `{$token}`
+
+parse_dotdotdot_rest_pattern = unexpected `...`
+    .label = not a valid pattern
+    .suggestion = for a rest pattern, use `..` instead of `...`
+
+parse_pattern_on_wrong_side_of_at = pattern on wrong side of `@`
+    .label_pattern = pattern on the left, should be on the right
+    .label_binding = binding on the right, should be on the left
+    .suggestion = switch the order
+
+parse_expected_binding_left_of_at = left-hand side of `@` must be a binding
+    .label_lhs = interpreted as a pattern, not a binding
+    .label_rhs = also a pattern
+    .note = bindings are `x`, `mut x`, `ref x`, and `ref mut x`
+
+parse_ambiguous_range_pattern = the range pattern here has ambiguous interpretation
+    .suggestion = add parentheses to clarify the precedence
+
+parse_unexpected_lifetime_in_pattern = unexpected lifetime `{$symbol}` in pattern
+    .suggestion = remove the lifetime
+
+parse_ref_mut_order_incorrect = the order of `mut` and `ref` is incorrect
+    .suggestion = try switching the order
+
+parse_mut_on_nested_ident_pattern = `mut` must be attached to each individual binding
+    .suggestion = add `mut` to each binding
+parse_mut_on_non_ident_pattern = `mut` must be followed by a named binding
+    .suggestion = remove the `mut` prefix
+parse_note_mut_pattern_usage = `mut` may be followed by `variable` and `variable @ pattern`
+
+parse_repeated_mut_in_pattern = `mut` on a binding may not be repeated
+    .suggestion = remove the additional `mut`s
+
+parse_dot_dot_dot_range_to_pattern_not_allowed = range-to patterns with `...` are not allowed
+    .suggestion = use `..=` instead
+
+parse_enum_pattern_instead_of_identifier = expected identifier, found enum pattern
+
+parse_dot_dot_dot_for_remaining_fields = expected field pattern, found `{$token_str}`
+    .suggestion = to omit remaining fields, use `..`
+
+parse_expected_comma_after_pattern_field = expected `,`
+
+parse_return_types_use_thin_arrow = return types are denoted using `->`
+    .suggestion = use `->` instead
+
+parse_need_plus_after_trait_object_lifetime = lifetime in trait object type must be followed by `+`
+
+parse_expected_mut_or_const_in_raw_pointer_type = expected `mut` or `const` keyword in raw pointer type
+    .suggestion = add `mut` or `const` here
+
+parse_lifetime_after_mut = lifetime must precede `mut`
+    .suggestion = place the lifetime before `mut`
+
+parse_dyn_after_mut = `mut` must precede `dyn`
+    .suggestion = place `mut` before `dyn`
+
+parse_fn_pointer_cannot_be_const = an `fn` pointer type cannot be `const`
+    .label = `const` because of this
+    .suggestion = remove the `const` qualifier
+
+parse_fn_pointer_cannot_be_async = an `fn` pointer type cannot be `async`
+    .label = `async` because of this
+    .suggestion = remove the `async` qualifier
+
+parse_nested_c_variadic_type = C-variadic type `...` may not be nested inside another type
+
+parse_invalid_dyn_keyword = invalid `dyn` keyword
+    .help = `dyn` is only needed at the start of a trait `+`-separated list
+    .suggestion = remove this keyword
+
+parse_negative_bounds_not_supported = negative bounds are not supported
+    .label = negative bounds are not supported
+    .suggestion = {$num_bounds ->
+            [one] remove the bound
+           *[other] remove the bounds
+        }
+
+parse_help_set_edition_cargo = set `edition = "{$edition}"` in `Cargo.toml`
+parse_help_set_edition_standalone = pass `--edition {$edition}` to `rustc`
+parse_note_edition_guide = for more on editions, read https://doc.rust-lang.org/edition-guide
+
+parse_unexpected_token_after_dot = unexpected token: `{$actual}`
+
+parse_cannot_be_raw_ident = `{$ident}` cannot be a raw identifier
+
+parse_cr_doc_comment = bare CR not allowed in {$block ->
+    [true] block doc-comment
+    *[false] doc-comment
+}
+
+parse_no_digits_literal = no valid digits found for number
+
+parse_invalid_digit_literal = invalid digit for a base {$base} literal
+
+parse_empty_exponent_float = expected at least one digit in exponent
+
+parse_float_literal_unsupported_base = {$base} float literal is not supported
+
+parse_more_than_one_char = character literal may only contain one codepoint
+    .followed_by = this `{$chr}` is followed by the combining {$len ->
+        [one] mark
+        *[other] marks
+        } `{$escaped_marks}`
+    .non_printing = there are non-printing characters, the full sequence is `{$escaped}`
+    .consider_normalized = consider using the normalized form `{$ch}` of this character
+    .remove_non = consider removing the non-printing characters
+    .use_double_quotes = if you meant to write a {$is_byte ->
+        [true] byte string
+        *[false] `str`
+        } literal, use double quotes
+
+parse_no_brace_unicode_escape = incorrect unicode escape sequence
+    .label = {parse_no_brace_unicode_escape}
+    .use_braces = format of unicode escape sequences uses braces
+    .format_of_unicode = format of unicode escape sequences is `\u{"{...}"}`
+
+parse_invalid_unicode_escape = invalid unicode character escape
+    .label = invalid escape
+    .help = unicode escape must {$surrogate ->
+    [true] not be a surrogate
+    *[false] be at most 10FFFF
+    }
+
+parse_escape_only_char = {$byte ->
+    [true] byte
+    *[false] character
+    } constant must be escaped: `{$escaped_msg}`
+    .escape = escape the character
+
+parse_bare_cr = {$double_quotes ->
+    [true] bare CR not allowed in string, use `\r` instead
+    *[false] character constant must be escaped: `\r`
+    }
+    .escape = escape the character
+
+parse_bare_cr_in_raw_string = bare CR not allowed in raw string
+
+parse_too_short_hex_escape = numeric character escape is too short
+
+parse_invalid_char_in_escape = {parse_invalid_char_in_escape_msg}: `{$ch}`
+    .label = {parse_invalid_char_in_escape_msg}
+
+parse_invalid_char_in_escape_msg = invalid character in {$is_hex ->
+    [true] numeric character
+    *[false] unicode
+    } escape
+
+parse_out_of_range_hex_escape = out of range hex escape
+    .label = must be a character in the range [\x00-\x7f]
+
+parse_leading_underscore_unicode_escape = {parse_leading_underscore_unicode_escape_label}: `_`
+parse_leading_underscore_unicode_escape_label = invalid start of unicode escape
+
+parse_overlong_unicode_escape = overlong unicode escape
+    .label = must have at most 6 hex digits
+
+parse_unclosed_unicode_escape = unterminated unicode escape
+    .label = missing a closing `{"}"}`
+    .terminate = terminate the unicode escape
+
+parse_unicode_escape_in_byte = unicode escape in byte string
+    .label = {parse_unicode_escape_in_byte}
+    .help = unicode escape sequences cannot be used as a byte or in a byte string
+
+parse_empty_unicode_escape = empty unicode escape
+    .label = this escape must have at least 1 hex digit
+
+parse_zero_chars = empty character literal
+    .label = {parse_zero_chars}
+
+parse_lone_slash = invalid trailing slash in literal
+    .label = {parse_lone_slash}
+
+parse_unskipped_whitespace = non-ASCII whitespace symbol '{$ch}' is not skipped
+    .label = {parse_unskipped_whitespace}
+
+parse_multiple_skipped_lines = multiple lines skipped by escaped newline
+    .label = skipping everything up to and including this point
+
+parse_unknown_prefix = prefix `{$prefix}` is unknown
+    .label = unknown prefix
+    .note =  prefixed identifiers and literals are reserved since Rust 2021
+    .suggestion_br = use `br` for a raw byte string
+    .suggestion_whitespace = consider inserting whitespace here
+
+parse_too_many_hashes = too many `#` symbols: raw strings may be delimited by up to 255 `#` symbols, but found {$num}
+
+parse_unknown_start_of_token = unknown start of token: {$escaped}
+    .sugg_quotes = Unicode characters '“' (Left Double Quotation Mark) and '”' (Right Double Quotation Mark) look like '{$ascii_str}' ({$ascii_name}), but are not
+    .sugg_other = Unicode character '{$ch}' ({$u_name}) looks like '{$ascii_str}' ({$ascii_name}), but it is not
+    .help_null = source files must contain UTF-8 encoded text, unexpected null bytes might occur when a different encoding is used
+    .note_repeats = character appears {$repeats ->
+        [one] once more
+        *[other] {$repeats} more times
+    }
diff --git a/compiler/rustc_parse/src/errors.rs b/compiler/rustc_parse/src/errors.rs
index 63bf864f2a8..c746a870964 100644
--- a/compiler/rustc_parse/src/errors.rs
+++ b/compiler/rustc_parse/src/errors.rs
@@ -2,13 +2,14 @@ use std::borrow::Cow;
 
 use rustc_ast::token::Token;
 use rustc_ast::{Path, Visibility};
-use rustc_errors::{fluent, AddToDiagnostic, Applicability, EmissionGuarantee, IntoDiagnostic};
+use rustc_errors::{AddToDiagnostic, Applicability, EmissionGuarantee, IntoDiagnostic};
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_session::errors::ExprParenthesesNeeded;
 use rustc_span::edition::{Edition, LATEST_STABLE_EDITION};
 use rustc_span::symbol::Ident;
 use rustc_span::{Span, Symbol};
 
+use crate::fluent_generated as fluent;
 use crate::parser::TokenDescription;
 
 #[derive(Diagnostic)]
@@ -78,7 +79,7 @@ pub(crate) struct IncorrectSemicolon<'a> {
 #[diag(parse_incorrect_use_of_await)]
 pub(crate) struct IncorrectUseOfAwait {
     #[primary_span]
-    #[suggestion(parentheses_suggestion, code = "", applicability = "machine-applicable")]
+    #[suggestion(parse_parentheses_suggestion, code = "", applicability = "machine-applicable")]
     pub span: Span,
 }
 
@@ -87,7 +88,7 @@ pub(crate) struct IncorrectUseOfAwait {
 pub(crate) struct IncorrectAwait {
     #[primary_span]
     pub span: Span,
-    #[suggestion(postfix_suggestion, code = "{expr}.await{question_mark}")]
+    #[suggestion(parse_postfix_suggestion, code = "{expr}.await{question_mark}")]
     pub sugg_span: (Span, Applicability),
     pub expr: String,
     pub question_mark: &'static str,
@@ -140,7 +141,7 @@ pub(crate) struct InvalidComparisonOperator {
 #[derive(Subdiagnostic)]
 pub(crate) enum InvalidComparisonOperatorSub {
     #[suggestion(
-        use_instead,
+        parse_use_instead,
         style = "short",
         applicability = "machine-applicable",
         code = "{correct}"
@@ -151,7 +152,7 @@ pub(crate) enum InvalidComparisonOperatorSub {
         invalid: String,
         correct: String,
     },
-    #[label(spaceship_operator_invalid)]
+    #[label(parse_spaceship_operator_invalid)]
     Spaceship(#[primary_span] Span),
 }
 
@@ -169,14 +170,14 @@ pub(crate) struct InvalidLogicalOperator {
 #[derive(Subdiagnostic)]
 pub(crate) enum InvalidLogicalOperatorSub {
     #[suggestion(
-        use_amp_amp_for_conjunction,
+        parse_use_amp_amp_for_conjunction,
         style = "short",
         applicability = "machine-applicable",
         code = "&&"
     )]
     Conjunction(#[primary_span] Span),
     #[suggestion(
-        use_pipe_pipe_for_disjunction,
+        parse_use_pipe_pipe_for_disjunction,
         style = "short",
         applicability = "machine-applicable",
         code = "||"
@@ -262,14 +263,14 @@ pub(crate) struct UnexpectedTokenAfterLabel {
     #[primary_span]
     #[label(parse_unexpected_token_after_label)]
     pub span: Span,
-    #[suggestion(suggestion_remove_label, style = "verbose", code = "")]
+    #[suggestion(parse_suggestion_remove_label, style = "verbose", code = "")]
     pub remove_label: Option<Span>,
     #[subdiagnostic]
     pub enclose_in_block: Option<UnexpectedTokenAfterLabelSugg>,
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion_enclose_in_block, applicability = "machine-applicable")]
+#[multipart_suggestion(parse_suggestion_enclose_in_block, applicability = "machine-applicable")]
 pub(crate) struct UnexpectedTokenAfterLabelSugg {
     #[suggestion_part(code = "{{ ")]
     pub left: Span,
@@ -347,9 +348,9 @@ pub(crate) struct IfExpressionMissingThenBlock {
 
 #[derive(Subdiagnostic)]
 pub(crate) enum IfExpressionMissingThenBlockSub {
-    #[help(condition_possibly_unfinished)]
+    #[help(parse_condition_possibly_unfinished)]
     UnfinishedCondition(#[primary_span] Span),
-    #[help(add_then_block)]
+    #[help(parse_add_then_block)]
     AddThenBlock(#[primary_span] Span),
 }
 
@@ -364,9 +365,9 @@ pub(crate) struct IfExpressionLetSomeSub {
 #[diag(parse_if_expression_missing_condition)]
 pub(crate) struct IfExpressionMissingCondition {
     #[primary_span]
-    #[label(condition_label)]
+    #[label(parse_condition_label)]
     pub if_span: Span,
-    #[label(block_label)]
+    #[label(parse_block_label)]
     pub block_span: Span,
 }
 
@@ -404,10 +405,10 @@ pub(crate) struct OuterAttributeNotAllowedOnIfElse {
     #[primary_span]
     pub last: Span,
 
-    #[label(branch_label)]
+    #[label(parse_branch_label)]
     pub branch_span: Span,
 
-    #[label(ctx_label)]
+    #[label(parse_ctx_label)]
     pub ctx_span: Span,
     pub ctx: String,
 
@@ -427,9 +428,14 @@ pub(crate) struct MissingInInForLoop {
 #[derive(Subdiagnostic)]
 pub(crate) enum MissingInInForLoopSub {
     // Has been misleading, at least in the past (closed Issue #48492), thus maybe-incorrect
-    #[suggestion(use_in_not_of, style = "short", applicability = "maybe-incorrect", code = "in")]
+    #[suggestion(
+        parse_use_in_not_of,
+        style = "short",
+        applicability = "maybe-incorrect",
+        code = "in"
+    )]
     InNotOf(#[primary_span] Span),
-    #[suggestion(add_in, style = "short", applicability = "maybe-incorrect", code = " in ")]
+    #[suggestion(parse_add_in, style = "short", applicability = "maybe-incorrect", code = " in ")]
     AddIn(#[primary_span] Span),
 }
 
@@ -484,8 +490,8 @@ pub(crate) struct EqFieldInit {
 #[diag(parse_dotdotdot)]
 pub(crate) struct DotDotDot {
     #[primary_span]
-    #[suggestion(suggest_exclusive_range, applicability = "maybe-incorrect", code = "..")]
-    #[suggestion(suggest_inclusive_range, applicability = "maybe-incorrect", code = "..=")]
+    #[suggestion(parse_suggest_exclusive_range, applicability = "maybe-incorrect", code = "..")]
+    #[suggestion(parse_suggest_inclusive_range, applicability = "maybe-incorrect", code = "..=")]
     pub span: Span,
 }
 
@@ -525,10 +531,10 @@ pub(crate) struct UseEmptyBlockNotSemi {
 #[diag(parse_comparison_interpreted_as_generic)]
 pub(crate) struct ComparisonInterpretedAsGeneric {
     #[primary_span]
-    #[label(label_comparison)]
+    #[label(parse_label_comparison)]
     pub comparison: Span,
     pub r#type: Path,
-    #[label(label_args)]
+    #[label(parse_label_args)]
     pub args: Span,
     #[subdiagnostic]
     pub suggestion: ComparisonOrShiftInterpretedAsGenericSugg,
@@ -538,17 +544,17 @@ pub(crate) struct ComparisonInterpretedAsGeneric {
 #[diag(parse_shift_interpreted_as_generic)]
 pub(crate) struct ShiftInterpretedAsGeneric {
     #[primary_span]
-    #[label(label_comparison)]
+    #[label(parse_label_comparison)]
     pub shift: Span,
     pub r#type: Path,
-    #[label(label_args)]
+    #[label(parse_label_args)]
     pub args: Span,
     #[subdiagnostic]
     pub suggestion: ComparisonOrShiftInterpretedAsGenericSugg,
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+#[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
 pub(crate) struct ComparisonOrShiftInterpretedAsGenericSugg {
     #[suggestion_part(code = "(")]
     pub left: Span,
@@ -574,7 +580,7 @@ pub(crate) struct LeadingPlusNotSupported {
     #[label]
     pub span: Span,
     #[suggestion(
-        suggestion_remove_plus,
+        parse_suggestion_remove_plus,
         style = "verbose",
         code = "",
         applicability = "machine-applicable"
@@ -597,7 +603,7 @@ pub(crate) struct ParenthesesWithStructFields {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion_braces_for_struct, applicability = "maybe-incorrect")]
+#[multipart_suggestion(parse_suggestion_braces_for_struct, applicability = "maybe-incorrect")]
 pub(crate) struct BracesForStructLiteral {
     #[suggestion_part(code = " {{ ")]
     pub first: Span,
@@ -606,7 +612,7 @@ pub(crate) struct BracesForStructLiteral {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion_no_fields_for_fn, applicability = "maybe-incorrect")]
+#[multipart_suggestion(parse_suggestion_no_fields_for_fn, applicability = "maybe-incorrect")]
 pub(crate) struct NoFieldsForFnCall {
     #[suggestion_part(code = "")]
     pub fields: Vec<Span>,
@@ -643,7 +649,7 @@ pub(crate) struct ArrayBracketsInsteadOfSpaces {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "maybe-incorrect")]
+#[multipart_suggestion(parse_suggestion, applicability = "maybe-incorrect")]
 pub(crate) struct ArrayBracketsInsteadOfSpacesSugg {
     #[suggestion_part(code = "[")]
     pub left: Span,
@@ -655,9 +661,9 @@ pub(crate) struct ArrayBracketsInsteadOfSpacesSugg {
 #[diag(parse_match_arm_body_without_braces)]
 pub(crate) struct MatchArmBodyWithoutBraces {
     #[primary_span]
-    #[label(label_statements)]
+    #[label(parse_label_statements)]
     pub statements: Span,
-    #[label(label_arrow)]
+    #[label(parse_label_arrow)]
     pub arrow: Span,
     pub num_statements: usize,
     #[subdiagnostic]
@@ -670,7 +676,7 @@ pub(crate) struct MatchArmBodyWithoutBraces {
 pub(crate) struct InclusiveRangeExtraEquals {
     #[primary_span]
     #[suggestion(
-        suggestion_remove_eq,
+        parse_suggestion_remove_eq,
         style = "short",
         code = "..=",
         applicability = "maybe-incorrect"
@@ -695,7 +701,7 @@ pub(crate) struct InclusiveRangeMatchArrow {
 pub(crate) struct InclusiveRangeNoEnd {
     #[primary_span]
     #[suggestion(
-        suggestion_open_range,
+        parse_suggestion_open_range,
         code = "..",
         applicability = "machine-applicable",
         style = "short"
@@ -705,7 +711,7 @@ pub(crate) struct InclusiveRangeNoEnd {
 
 #[derive(Subdiagnostic)]
 pub(crate) enum MatchArmBodyWithoutBracesSugg {
-    #[multipart_suggestion(suggestion_add_braces, applicability = "machine-applicable")]
+    #[multipart_suggestion(parse_suggestion_add_braces, applicability = "machine-applicable")]
     AddBraces {
         #[suggestion_part(code = "{{ ")]
         left: Span,
@@ -713,7 +719,7 @@ pub(crate) enum MatchArmBodyWithoutBracesSugg {
         right: Span,
     },
     #[suggestion(
-        suggestion_use_comma_not_semicolon,
+        parse_suggestion_use_comma_not_semicolon,
         code = ",",
         applicability = "machine-applicable"
     )]
@@ -733,7 +739,7 @@ pub(crate) struct StructLiteralNotAllowedHere {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+#[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
 pub(crate) struct StructLiteralNotAllowedHereSugg {
     #[suggestion_part(code = "(")]
     pub left: Span,
@@ -755,9 +761,9 @@ pub(crate) struct InvalidLiteralSuffixOnTupleIndex {
     #[label]
     pub span: Span,
     pub suffix: Symbol,
-    #[help(tuple_exception_line_1)]
-    #[help(tuple_exception_line_2)]
-    #[help(tuple_exception_line_3)]
+    #[help(parse_tuple_exception_line_1)]
+    #[help(parse_tuple_exception_line_2)]
+    #[help(parse_tuple_exception_line_3)]
     pub exception: Option<()>,
 }
 
@@ -775,11 +781,11 @@ pub(crate) struct MismatchedClosingDelimiter {
     #[primary_span]
     pub spans: Vec<Span>,
     pub delimiter: String,
-    #[label(label_unmatched)]
+    #[label(parse_label_unmatched)]
     pub unmatched: Span,
-    #[label(label_opening_candidate)]
+    #[label(parse_label_opening_candidate)]
     pub opening_candidate: Option<Span>,
-    #[label(label_unclosed)]
+    #[label(parse_label_unclosed)]
     pub unclosed: Option<Span>,
 }
 
@@ -930,7 +936,7 @@ impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for ExpectedIdentifier {
         self,
         handler: &'a rustc_errors::Handler,
     ) -> rustc_errors::DiagnosticBuilder<'a, G> {
-        let token_descr = super::parser::TokenDescription::from_token(&self.token);
+        let token_descr = TokenDescription::from_token(&self.token);
 
         let mut diag = handler.struct_diagnostic(match token_descr {
             Some(TokenDescription::ReservedIdentifier) => {
@@ -976,7 +982,7 @@ impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for ExpectedSemi {
         self,
         handler: &'a rustc_errors::Handler,
     ) -> rustc_errors::DiagnosticBuilder<'a, G> {
-        let token_descr = super::parser::TokenDescription::from_token(&self.token);
+        let token_descr = TokenDescription::from_token(&self.token);
 
         let mut diag = handler.struct_diagnostic(match token_descr {
             Some(TokenDescription::ReservedIdentifier) => {
@@ -1025,7 +1031,7 @@ pub(crate) struct StructLiteralBodyWithoutPath {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "has-placeholders")]
+#[multipart_suggestion(parse_suggestion, applicability = "has-placeholders")]
 pub(crate) struct StructLiteralBodyWithoutPathSugg {
     #[suggestion_part(code = "{{ SomeStruct ")]
     pub before: Span,
@@ -1043,7 +1049,7 @@ pub(crate) struct StructLiteralNeedingParens {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+#[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
 pub(crate) struct StructLiteralNeedingParensSugg {
     #[suggestion_part(code = "(")]
     pub before: Span,
@@ -1070,7 +1076,7 @@ pub(crate) struct GenericParamsWithoutAngleBrackets {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+#[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
 pub(crate) struct GenericParamsWithoutAngleBracketsSugg {
     #[suggestion_part(code = "<")]
     pub left: Span,
@@ -1091,7 +1097,7 @@ pub(crate) struct ComparisonOperatorsCannotBeChained {
     )]
     pub suggest_turbofish: Option<Span>,
     #[help(parse_sugg_turbofish_syntax)]
-    #[help(sugg_parentheses_for_function_args)]
+    #[help(parse_sugg_parentheses_for_function_args)]
     pub help_turbofish: Option<()>,
     #[subdiagnostic]
     pub chaining_sugg: Option<ComparisonOperatorsCannotBeChainedSugg>,
@@ -1100,7 +1106,7 @@ pub(crate) struct ComparisonOperatorsCannotBeChained {
 #[derive(Subdiagnostic)]
 pub(crate) enum ComparisonOperatorsCannotBeChainedSugg {
     #[suggestion(
-        sugg_split_comparison,
+        parse_sugg_split_comparison,
         style = "verbose",
         code = " && {middle_term}",
         applicability = "maybe-incorrect"
@@ -1110,7 +1116,7 @@ pub(crate) enum ComparisonOperatorsCannotBeChainedSugg {
         span: Span,
         middle_term: String,
     },
-    #[multipart_suggestion(sugg_parenthesize, applicability = "maybe-incorrect")]
+    #[multipart_suggestion(parse_sugg_parenthesize, applicability = "maybe-incorrect")]
     Parenthesize {
         #[suggestion_part(code = "(")]
         left: Span,
@@ -1130,7 +1136,7 @@ pub(crate) struct QuestionMarkInType {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+#[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
 pub(crate) struct QuestionMarkInTypeSugg {
     #[suggestion_part(code = "Option<")]
     pub left: Span,
@@ -1148,7 +1154,7 @@ pub(crate) struct ParenthesesInForHead {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+#[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
 pub(crate) struct ParenthesesInForHeadSugg {
     #[suggestion_part(code = "{left_snippet}")]
     pub left: Span,
@@ -1208,7 +1214,7 @@ pub(crate) struct ConstGenericWithoutBraces {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+#[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
 pub(crate) struct ConstGenericWithoutBracesSugg {
     #[suggestion_part(code = "{{ ")]
     pub left: Span,
@@ -1228,7 +1234,7 @@ pub(crate) struct UnexpectedConstParamDeclaration {
 
 #[derive(Subdiagnostic)]
 pub(crate) enum UnexpectedConstParamDeclarationSugg {
-    #[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+    #[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
     AddParam {
         #[suggestion_part(code = "<{snippet}>")]
         impl_generics: Span,
@@ -1237,7 +1243,7 @@ pub(crate) enum UnexpectedConstParamDeclarationSugg {
         snippet: String,
         ident: String,
     },
-    #[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+    #[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
     AppendParam {
         #[suggestion_part(code = ", {snippet}")]
         impl_generics_end: Span,
@@ -1284,7 +1290,7 @@ pub(crate) struct FnPtrWithGenerics {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "maybe-incorrect")]
+#[multipart_suggestion(parse_suggestion, applicability = "maybe-incorrect")]
 pub(crate) struct FnPtrWithGenericsSugg {
     #[suggestion_part(code = "{snippet}")]
     pub left: Span,
@@ -1325,16 +1331,16 @@ pub(crate) struct WhereClauseBeforeTupleStructBody {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(name_label)]
+    #[label(parse_name_label)]
     pub name: Span,
-    #[label(body_label)]
+    #[label(parse_body_label)]
     pub body: Span,
     #[subdiagnostic]
     pub sugg: Option<WhereClauseBeforeTupleStructBodySugg>,
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+#[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
 pub(crate) struct WhereClauseBeforeTupleStructBodySugg {
     #[suggestion_part(code = "{snippet}")]
     pub left: Span,
@@ -1429,13 +1435,13 @@ pub(crate) enum MissingKeywordForItemDefinition {
 
 #[derive(Subdiagnostic)]
 pub(crate) enum AmbiguousMissingKwForItemSub {
-    #[suggestion(suggestion, applicability = "maybe-incorrect", code = "{snippet}!")]
+    #[suggestion(parse_suggestion, applicability = "maybe-incorrect", code = "{snippet}!")]
     SuggestMacro {
         #[primary_span]
         span: Span,
         snippet: String,
     },
-    #[help(help)]
+    #[help(parse_help)]
     HelpMacro,
 }
 
@@ -1443,9 +1449,9 @@ pub(crate) enum AmbiguousMissingKwForItemSub {
 #[diag(parse_missing_trait_in_trait_impl)]
 pub(crate) struct MissingTraitInTraitImpl {
     #[primary_span]
-    #[suggestion(suggestion_add_trait, code = " Trait ", applicability = "has-placeholders")]
+    #[suggestion(parse_suggestion_add_trait, code = " Trait ", applicability = "has-placeholders")]
     pub span: Span,
-    #[suggestion(suggestion_remove_for, code = "", applicability = "maybe-incorrect")]
+    #[suggestion(parse_suggestion_remove_for, code = "", applicability = "maybe-incorrect")]
     pub for_span: Span,
 }
 
@@ -1505,7 +1511,7 @@ pub(crate) struct ExternCrateNameWithDashes {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(suggestion, applicability = "machine-applicable")]
+#[multipart_suggestion(parse_suggestion, applicability = "machine-applicable")]
 pub(crate) struct ExternCrateNameWithDashesSugg {
     #[suggestion_part(code = "_")]
     pub dashes: Vec<Span>,
@@ -1726,10 +1732,15 @@ pub struct UnknownPrefix<'a> {
 
 #[derive(Subdiagnostic)]
 pub enum UnknownPrefixSugg {
-    #[suggestion(suggestion_br, code = "br", applicability = "maybe-incorrect", style = "verbose")]
+    #[suggestion(
+        parse_suggestion_br,
+        code = "br",
+        applicability = "maybe-incorrect",
+        style = "verbose"
+    )]
     UseBr(#[primary_span] Span),
     #[suggestion(
-        suggestion_whitespace,
+        parse_suggestion_whitespace,
         code = " ",
         applicability = "maybe-incorrect",
         style = "verbose"
@@ -1761,7 +1772,7 @@ pub struct UnknownTokenStart {
 
 #[derive(Subdiagnostic)]
 pub enum TokenSubstitution {
-    #[suggestion(sugg_quotes, code = "{suggestion}", applicability = "maybe-incorrect")]
+    #[suggestion(parse_sugg_quotes, code = "{suggestion}", applicability = "maybe-incorrect")]
     DirectedQuotes {
         #[primary_span]
         span: Span,
@@ -1769,7 +1780,7 @@ pub enum TokenSubstitution {
         ascii_str: &'static str,
         ascii_name: &'static str,
     },
-    #[suggestion(sugg_other, code = "{suggestion}", applicability = "maybe-incorrect")]
+    #[suggestion(parse_sugg_other, code = "{suggestion}", applicability = "maybe-incorrect")]
     Other {
         #[primary_span]
         span: Span,
@@ -1782,13 +1793,13 @@ pub enum TokenSubstitution {
 }
 
 #[derive(Subdiagnostic)]
-#[note(note_repeats)]
+#[note(parse_note_repeats)]
 pub struct UnknownTokenRepeat {
     pub repeats: usize,
 }
 
 #[derive(Subdiagnostic)]
-#[help(help_null)]
+#[help(parse_help_null)]
 pub struct UnknownTokenNull;
 
 #[derive(Diagnostic)]
@@ -1805,7 +1816,7 @@ pub enum UnescapeError {
     EscapeOnlyChar {
         #[primary_span]
         span: Span,
-        #[suggestion(escape, applicability = "machine-applicable", code = "{escaped_sugg}")]
+        #[suggestion(parse_escape, applicability = "machine-applicable", code = "{escaped_sugg}")]
         char_span: Span,
         escaped_sugg: String,
         escaped_msg: String,
@@ -1814,7 +1825,7 @@ pub enum UnescapeError {
     #[diag(parse_bare_cr)]
     BareCr {
         #[primary_span]
-        #[suggestion(escape, applicability = "machine-applicable", code = "\\r")]
+        #[suggestion(parse_escape, applicability = "machine-applicable", code = "\\r")]
         span: Span,
         double_quotes: bool,
     },
@@ -1854,7 +1865,12 @@ pub enum UnescapeError {
         #[primary_span]
         #[label]
         Span,
-        #[suggestion(terminate, code = "}}", applicability = "maybe-incorrect", style = "verbose")]
+        #[suggestion(
+            parse_terminate,
+            code = "}}",
+            applicability = "maybe-incorrect",
+            style = "verbose"
+        )]
         Span,
     ),
     #[diag(parse_no_brace_unicode_escape)]
@@ -1918,20 +1934,24 @@ pub enum UnescapeError {
 
 #[derive(Subdiagnostic)]
 pub enum MoreThanOneCharSugg {
-    #[suggestion(consider_normalized, code = "{normalized}", applicability = "machine-applicable")]
+    #[suggestion(
+        parse_consider_normalized,
+        code = "{normalized}",
+        applicability = "machine-applicable"
+    )]
     NormalizedForm {
         #[primary_span]
         span: Span,
         ch: String,
         normalized: String,
     },
-    #[suggestion(remove_non, code = "{ch}", applicability = "maybe-incorrect")]
+    #[suggestion(parse_remove_non, code = "{ch}", applicability = "maybe-incorrect")]
     RemoveNonPrinting {
         #[primary_span]
         span: Span,
         ch: String,
     },
-    #[suggestion(use_double_quotes, code = "{sugg}", applicability = "machine-applicable")]
+    #[suggestion(parse_use_double_quotes, code = "{sugg}", applicability = "machine-applicable")]
     Quotes {
         #[primary_span]
         span: Span,
@@ -1942,7 +1962,7 @@ pub enum MoreThanOneCharSugg {
 
 #[derive(Subdiagnostic)]
 pub enum MoreThanOneCharNote {
-    #[note(followed_by)]
+    #[note(parse_followed_by)]
     AllCombining {
         #[primary_span]
         span: Span,
@@ -1950,7 +1970,7 @@ pub enum MoreThanOneCharNote {
         len: usize,
         escaped_marks: String,
     },
-    #[note(non_printing)]
+    #[note(parse_non_printing)]
     NonPrinting {
         #[primary_span]
         span: Span,
@@ -1960,13 +1980,13 @@ pub enum MoreThanOneCharNote {
 
 #[derive(Subdiagnostic)]
 pub enum NoBraceUnicodeSub {
-    #[suggestion(use_braces, code = "{suggestion}", applicability = "maybe-incorrect")]
+    #[suggestion(parse_use_braces, code = "{suggestion}", applicability = "maybe-incorrect")]
     Suggestion {
         #[primary_span]
         span: Span,
         suggestion: String,
     },
-    #[help(format_of_unicode)]
+    #[help(parse_format_of_unicode)]
     Help,
 }
 
@@ -2042,9 +2062,9 @@ pub(crate) struct PatternOnWrongSideOfAt {
     #[suggestion(code = "{whole_pat}", applicability = "machine-applicable")]
     pub whole_span: Span,
     pub whole_pat: String,
-    #[label(label_pattern)]
+    #[label(parse_label_pattern)]
     pub pattern: Span,
-    #[label(label_binding)]
+    #[label(parse_label_binding)]
     pub binding: Span,
 }
 
@@ -2054,9 +2074,9 @@ pub(crate) struct PatternOnWrongSideOfAt {
 pub(crate) struct ExpectedBindingLeftOfAt {
     #[primary_span]
     pub whole_span: Span,
-    #[label(label_lhs)]
+    #[label(parse_label_lhs)]
     pub lhs: Span,
-    #[label(label_rhs)]
+    #[label(parse_label_rhs)]
     pub rhs: Span,
 }
 
@@ -2236,7 +2256,7 @@ pub(crate) struct NegativeBoundsNotSupported {
 
 #[derive(Subdiagnostic)]
 #[suggestion(
-    suggestion,
+    parse_suggestion,
     style = "tool-only",
     code = "{fixed}",
     applicability = "machine-applicable"
diff --git a/compiler/rustc_parse/src/lib.rs b/compiler/rustc_parse/src/lib.rs
index b49a01d75ed..6f37e9758fc 100644
--- a/compiler/rustc_parse/src/lib.rs
+++ b/compiler/rustc_parse/src/lib.rs
@@ -19,6 +19,8 @@ use rustc_ast::{AttrItem, Attribute, MetaItem};
 use rustc_ast_pretty::pprust;
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::{Applicability, Diagnostic, FatalError, Level, PResult};
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
 use rustc_session::parse::ParseSess;
 use rustc_span::{FileName, SourceFile, Span};
 
@@ -34,6 +36,8 @@ pub mod validate_attr;
 
 mod errors;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 // A bunch of utility functions of the form `parse_<thing>_from_<source>`
 // where <thing> includes crate, expr, item, stmt, tts, and one that
 // uses a HOF to parse anything, and <source> includes file and
diff --git a/compiler/rustc_parse/src/parser/attr.rs b/compiler/rustc_parse/src/parser/attr.rs
index 9fa657e725c..e3e7c63e344 100644
--- a/compiler/rustc_parse/src/parser/attr.rs
+++ b/compiler/rustc_parse/src/parser/attr.rs
@@ -1,10 +1,11 @@
 use crate::errors::{InvalidMetaItem, SuffixedLiteralInAttribute};
+use crate::fluent_generated as fluent;
 
 use super::{AttrWrapper, Capturing, FnParseMode, ForceCollect, Parser, PathStyle};
 use rustc_ast as ast;
 use rustc_ast::attr;
 use rustc_ast::token::{self, Delimiter, Nonterminal};
-use rustc_errors::{error_code, fluent, Diagnostic, IntoDiagnostic, PResult};
+use rustc_errors::{error_code, Diagnostic, IntoDiagnostic, PResult};
 use rustc_span::{sym, BytePos, Span};
 use std::convert::TryInto;
 use thin_vec::ThinVec;
@@ -68,10 +69,10 @@ impl<'a> Parser<'a> {
                             token::CommentKind::Block => OuterAttributeType::DocBlockComment,
                         },
                     ) {
-                        err.note(fluent::note);
+                        err.note(fluent::parse_note);
                         err.span_suggestion_verbose(
                             replacement_span,
-                            fluent::suggestion,
+                            fluent::parse_suggestion,
                             "",
                             rustc_errors::Applicability::MachineApplicable,
                         );
@@ -175,10 +176,10 @@ impl<'a> Parser<'a> {
             Ok(Some(item)) => {
                 // FIXME(#100717)
                 err.set_arg("item", item.kind.descr());
-                err.span_label(item.span, fluent::label_does_not_annotate_this);
+                err.span_label(item.span, fluent::parse_label_does_not_annotate_this);
                 err.span_suggestion_verbose(
                     replacement_span,
-                    fluent::sugg_change_inner_to_outer,
+                    fluent::parse_sugg_change_inner_to_outer,
                     match attr_type {
                         OuterAttributeType::Attribute => "",
                         OuterAttributeType::DocBlockComment => "*",
@@ -204,8 +205,8 @@ impl<'a> Parser<'a> {
                         attr_sp,
                         fluent::parse_inner_attr_not_permitted_after_outer_doc_comment,
                     );
-                    diag.span_label(attr_sp, fluent::label_attr)
-                        .span_label(prev_doc_comment_span, fluent::label_prev_doc_comment);
+                    diag.span_label(attr_sp, fluent::parse_label_attr)
+                        .span_label(prev_doc_comment_span, fluent::parse_label_prev_doc_comment);
                     diag
                 }
                 Some(InnerAttrForbiddenReason::AfterOuterAttribute { prev_outer_attr_sp }) => {
@@ -213,8 +214,8 @@ impl<'a> Parser<'a> {
                         attr_sp,
                         fluent::parse_inner_attr_not_permitted_after_outer_attr,
                     );
-                    diag.span_label(attr_sp, fluent::label_attr)
-                        .span_label(prev_outer_attr_sp, fluent::label_prev_attr);
+                    diag.span_label(attr_sp, fluent::parse_label_attr)
+                        .span_label(prev_outer_attr_sp, fluent::parse_label_prev_attr);
                     diag
                 }
                 Some(InnerAttrForbiddenReason::InCodeBlock) | None => {
diff --git a/compiler/rustc_parse/src/parser/diagnostics.rs b/compiler/rustc_parse/src/parser/diagnostics.rs
index 46685dcc45d..d235b8a8176 100644
--- a/compiler/rustc_parse/src/parser/diagnostics.rs
+++ b/compiler/rustc_parse/src/parser/diagnostics.rs
@@ -18,6 +18,7 @@ use crate::errors::{
     UseEqInstead,
 };
 
+use crate::fluent_generated as fluent;
 use crate::lexer::UnmatchedBrace;
 use crate::parser;
 use rustc_ast as ast;
@@ -32,10 +33,9 @@ use rustc_ast::{
 use rustc_ast_pretty::pprust;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::{
-    fluent, Applicability, DiagnosticBuilder, DiagnosticMessage, FatalError, Handler, MultiSpan,
-    PResult,
+    pluralize, Applicability, Diagnostic, DiagnosticBuilder, DiagnosticMessage, ErrorGuaranteed,
+    FatalError, Handler, IntoDiagnostic, MultiSpan, PResult,
 };
-use rustc_errors::{pluralize, Diagnostic, ErrorGuaranteed, IntoDiagnostic};
 use rustc_session::errors::ExprParenthesesNeeded;
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{kw, sym, Ident};
diff --git a/compiler/rustc_parse/src/parser/pat.rs b/compiler/rustc_parse/src/parser/pat.rs
index 94f7031fad2..8e920f1c421 100644
--- a/compiler/rustc_parse/src/parser/pat.rs
+++ b/compiler/rustc_parse/src/parser/pat.rs
@@ -8,6 +8,7 @@ use crate::errors::{
     TrailingVertNotAllowed, UnexpectedLifetimeInPattern, UnexpectedVertVertBeforeFunctionParam,
     UnexpectedVertVertInPattern,
 };
+use crate::fluent_generated as fluent;
 use crate::{maybe_recover_from_interpolated_ty_qpath, maybe_whole};
 use rustc_ast::mut_visit::{noop_visit_pat, MutVisitor};
 use rustc_ast::ptr::P;
@@ -17,9 +18,7 @@ use rustc_ast::{
     PatField, PatKind, Path, QSelf, RangeEnd, RangeSyntax,
 };
 use rustc_ast_pretty::pprust;
-use rustc_errors::{
-    fluent, Applicability, DiagnosticBuilder, ErrorGuaranteed, IntoDiagnostic, PResult,
-};
+use rustc_errors::{Applicability, DiagnosticBuilder, ErrorGuaranteed, IntoDiagnostic, PResult};
 use rustc_session::errors::ExprParenthesesNeeded;
 use rustc_span::source_map::{respan, Span, Spanned};
 use rustc_span::symbol::{kw, sym, Ident};
diff --git a/compiler/rustc_passes/locales/en-US.ftl b/compiler/rustc_passes/locales/en-US.ftl
new file mode 100644
index 00000000000..0c7e02912d4
--- /dev/null
+++ b/compiler/rustc_passes/locales/en-US.ftl
@@ -0,0 +1,747 @@
+-passes_previously_accepted =
+    this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+
+-passes_see_issue =
+    see issue #{$issue} <https://github.com/rust-lang/rust/issues/{$issue}> for more information
+
+passes_incorrect_do_not_recommend_location =
+    `#[do_not_recommend]` can only be placed on trait implementations
+
+passes_outer_crate_level_attr =
+    crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
+
+passes_inner_crate_level_attr =
+    crate-level attribute should be in the root module
+
+passes_ignored_attr_with_macro =
+    `#[{$sym}]` is ignored on struct fields, match arms and macro defs
+    .warn = {-passes_previously_accepted}
+    .note = {-passes_see_issue(issue: "80564")}
+
+passes_ignored_attr =
+    `#[{$sym}]` is ignored on struct fields and match arms
+    .warn = {-passes_previously_accepted}
+    .note = {-passes_see_issue(issue: "80564")}
+
+passes_inline_ignored_function_prototype =
+    `#[inline]` is ignored on function prototypes
+
+passes_inline_ignored_constants =
+    `#[inline]` is ignored on constants
+    .warn = {-passes_previously_accepted}
+    .note = {-passes_see_issue(issue: "65833")}
+
+passes_inline_not_fn_or_closure =
+    attribute should be applied to function or closure
+    .label = not a function or closure
+
+passes_no_coverage_ignored_function_prototype =
+    `#[no_coverage]` is ignored on function prototypes
+
+passes_no_coverage_propagate =
+    `#[no_coverage]` does not propagate into items and must be applied to the contained functions directly
+
+passes_no_coverage_fn_defn =
+    `#[no_coverage]` may only be applied to function definitions
+
+passes_no_coverage_not_coverable =
+    `#[no_coverage]` must be applied to coverable code
+    .label = not coverable code
+
+passes_should_be_applied_to_fn =
+    attribute should be applied to a function definition
+    .label = {$on_crate ->
+        [true] cannot be applied to crates
+        *[false] not a function definition
+    }
+
+passes_naked_tracked_caller =
+    cannot use `#[track_caller]` with `#[naked]`
+
+passes_should_be_applied_to_struct_enum =
+    attribute should be applied to a struct or enum
+    .label = not a struct or enum
+
+passes_should_be_applied_to_trait =
+    attribute should be applied to a trait
+    .label = not a trait
+
+passes_target_feature_on_statement =
+    {passes_should_be_applied_to_fn}
+    .warn = {-passes_previously_accepted}
+    .label = {passes_should_be_applied_to_fn.label}
+
+passes_should_be_applied_to_static =
+    attribute should be applied to a static
+    .label = not a static
+
+passes_doc_expect_str =
+    doc {$attr_name} attribute expects a string: #[doc({$attr_name} = "a")]
+
+passes_doc_alias_empty =
+    {$attr_str} attribute cannot have empty value
+
+passes_doc_alias_bad_char =
+    {$char_} character isn't allowed in {$attr_str}
+
+passes_doc_alias_start_end =
+    {$attr_str} cannot start or end with ' '
+
+passes_doc_alias_bad_location =
+    {$attr_str} isn't allowed on {$location}
+
+passes_doc_alias_not_an_alias =
+    {$attr_str} is the same as the item's name
+
+passes_doc_alias_duplicated = doc alias is duplicated
+    .label = first defined here
+
+passes_doc_alias_not_string_literal =
+    `#[doc(alias("a"))]` expects string literals
+
+passes_doc_alias_malformed =
+    doc alias attribute expects a string `#[doc(alias = "a")]` or a list of strings `#[doc(alias("a", "b"))]`
+
+passes_doc_keyword_empty_mod =
+    `#[doc(keyword = "...")]` should be used on empty modules
+
+passes_doc_keyword_not_mod =
+    `#[doc(keyword = "...")]` should be used on modules
+
+passes_doc_keyword_invalid_ident =
+    `{$doc_keyword}` is not a valid identifier
+
+passes_doc_fake_variadic_not_valid =
+    `#[doc(fake_variadic)]` must be used on the first of a set of tuple or fn pointer trait impls with varying arity
+
+passes_doc_keyword_only_impl =
+    `#[doc(keyword = "...")]` should be used on impl blocks
+
+passes_doc_inline_conflict_first =
+    this attribute...
+
+passes_doc_inline_conflict_second =
+    {"."}..conflicts with this attribute
+
+passes_doc_inline_conflict =
+    conflicting doc inlining attributes
+    .help = remove one of the conflicting attributes
+
+passes_doc_inline_only_use =
+    this attribute can only be applied to a `use` item
+    .label = only applicable on `use` items
+    .not_a_use_item_label = not a `use` item
+    .note = read <https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#inline-and-no_inline> for more information
+
+passes_doc_attr_not_crate_level =
+    `#![doc({$attr_name} = "...")]` isn't allowed as a crate-level attribute
+
+passes_attr_crate_level =
+    this attribute can only be applied at the crate level
+    .suggestion = to apply to the crate, use an inner attribute
+    .help = to apply to the crate, use an inner attribute
+    .note = read <https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#at-the-crate-level> for more information
+
+passes_doc_test_unknown =
+    unknown `doc(test)` attribute `{$path}`
+
+passes_doc_test_takes_list =
+    `#[doc(test(...)]` takes a list of attributes
+
+passes_doc_primitive =
+    `doc(primitive)` should never have been stable
+
+passes_doc_cfg_hide_takes_list =
+    `#[doc(cfg_hide(...)]` takes a list of attributes
+
+passes_doc_test_unknown_any =
+    unknown `doc` attribute `{$path}`
+
+passes_doc_test_unknown_spotlight =
+    unknown `doc` attribute `{$path}`
+    .note = `doc(spotlight)` was renamed to `doc(notable_trait)`
+    .suggestion = use `notable_trait` instead
+    .no_op_note = `doc(spotlight)` is now a no-op
+
+passes_doc_test_unknown_include =
+    unknown `doc` attribute `{$path}`
+    .suggestion = use `doc = include_str!` instead
+
+passes_doc_invalid =
+    invalid `doc` attribute
+
+passes_pass_by_value =
+    `pass_by_value` attribute should be applied to a struct, enum or type alias
+    .label = is not a struct, enum or type alias
+
+passes_allow_incoherent_impl =
+    `rustc_allow_incoherent_impl` attribute should be applied to impl items.
+    .label = the only currently supported targets are inherent methods
+
+passes_has_incoherent_inherent_impl =
+    `rustc_has_incoherent_inherent_impls` attribute should be applied to types or traits.
+    .label = only adts, extern types and traits are supported
+
+passes_both_ffi_const_and_pure =
+    `#[ffi_const]` function cannot be `#[ffi_pure]`
+
+passes_ffi_pure_invalid_target =
+    `#[ffi_pure]` may only be used on foreign functions
+
+passes_ffi_const_invalid_target =
+    `#[ffi_const]` may only be used on foreign functions
+
+passes_ffi_returns_twice_invalid_target =
+    `#[ffi_returns_twice]` may only be used on foreign functions
+
+passes_must_use_async =
+    `must_use` attribute on `async` functions applies to the anonymous `Future` returned by the function, not the value within
+    .label = this attribute does nothing, the `Future`s returned by async functions are already `must_use`
+
+passes_must_use_no_effect =
+    `#[must_use]` has no effect when applied to {$article} {$target}
+
+passes_must_not_suspend =
+    `must_not_suspend` attribute should be applied to a struct, enum, or trait
+    .label = is not a struct, enum, or trait
+
+passes_cold =
+    {passes_should_be_applied_to_fn}
+    .warn = {-passes_previously_accepted}
+    .label = {passes_should_be_applied_to_fn.label}
+
+passes_link =
+    attribute should be applied to an `extern` block with non-Rust ABI
+    .warn = {-passes_previously_accepted}
+    .label = not an `extern` block
+
+passes_link_name =
+    attribute should be applied to a foreign function or static
+    .warn = {-passes_previously_accepted}
+    .label = not a foreign function or static
+    .help = try `#[link(name = "{$value}")]` instead
+
+passes_no_link =
+    attribute should be applied to an `extern crate` item
+    .label = not an `extern crate` item
+
+passes_export_name =
+    attribute should be applied to a free function, impl method or static
+    .label = not a free function, impl method or static
+
+passes_rustc_layout_scalar_valid_range_not_struct =
+    attribute should be applied to a struct
+    .label = not a struct
+
+passes_rustc_layout_scalar_valid_range_arg =
+    expected exactly one integer literal argument
+
+passes_rustc_legacy_const_generics_only =
+    #[rustc_legacy_const_generics] functions must only have const generics
+    .label = non-const generic parameter
+
+passes_rustc_legacy_const_generics_index =
+    #[rustc_legacy_const_generics] must have one index for each generic parameter
+    .label = generic parameters
+
+passes_rustc_legacy_const_generics_index_exceed =
+    index exceeds number of arguments
+    .label = there {$arg_count ->
+        [one] is
+        *[other] are
+    } only {$arg_count} {$arg_count ->
+        [one] argument
+        *[other] arguments
+    }
+
+passes_rustc_legacy_const_generics_index_negative =
+    arguments should be non-negative integers
+
+passes_rustc_dirty_clean =
+    attribute requires -Z query-dep-graph to be enabled
+
+passes_link_section =
+    attribute should be applied to a function or static
+    .warn = {-passes_previously_accepted}
+    .label = not a function or static
+
+passes_no_mangle_foreign =
+    `#[no_mangle]` has no effect on a foreign {$foreign_item_kind}
+    .warn = {-passes_previously_accepted}
+    .label = foreign {$foreign_item_kind}
+    .note = symbol names in extern blocks are not mangled
+    .suggestion = remove this attribute
+
+passes_no_mangle =
+    attribute should be applied to a free function, impl method or static
+    .warn = {-passes_previously_accepted}
+    .label = not a free function, impl method or static
+
+passes_repr_ident =
+    meta item in `repr` must be an identifier
+
+passes_repr_conflicting =
+    conflicting representation hints
+
+passes_used_static =
+    attribute must be applied to a `static` variable
+
+passes_used_compiler_linker =
+    `used(compiler)` and `used(linker)` can't be used together
+
+passes_allow_internal_unstable =
+    attribute should be applied to a macro
+    .label = not a macro
+
+passes_debug_visualizer_placement =
+    attribute should be applied to a module
+
+passes_debug_visualizer_invalid =
+    invalid argument
+    .note_1 = expected: `natvis_file = "..."`
+    .note_2 = OR
+    .note_3 = expected: `gdb_script_file = "..."`
+
+passes_debug_visualizer_unreadable =
+    couldn't read {$file}: {$error}
+
+passes_rustc_allow_const_fn_unstable =
+    attribute should be applied to `const fn`
+    .label = not a `const fn`
+
+passes_rustc_std_internal_symbol =
+    attribute should be applied to functions or statics
+    .label = not a function or static
+
+passes_const_trait =
+    attribute should be applied to a trait
+
+passes_stability_promotable =
+    attribute cannot be applied to an expression
+
+passes_deprecated =
+    attribute is ignored here
+
+passes_macro_use =
+    `#[{$name}]` only has an effect on `extern crate` and modules
+
+passes_macro_export =
+    `#[macro_export]` only has an effect on macro definitions
+
+passes_plugin_registrar =
+    `#[plugin_registrar]` only has an effect on functions
+
+passes_unused_empty_lints_note =
+    attribute `{$name}` with an empty list has no effect
+
+passes_unused_no_lints_note =
+    attribute `{$name}` without any lints has no effect
+
+passes_unused_default_method_body_const_note =
+    `default_method_body_is_const` has been replaced with `#[const_trait]` on traits
+
+passes_unused =
+    unused attribute
+    .suggestion = remove this attribute
+
+passes_non_exported_macro_invalid_attrs =
+    attribute should be applied to function or closure
+    .label = not a function or closure
+
+passes_unused_duplicate =
+    unused attribute
+    .suggestion = remove this attribute
+    .note = attribute also specified here
+    .warn = {-passes_previously_accepted}
+
+passes_unused_multiple =
+    multiple `{$name}` attributes
+    .suggestion = remove this attribute
+    .note = attribute also specified here
+
+passes_rustc_lint_opt_ty =
+    `#[rustc_lint_opt_ty]` should be applied to a struct
+    .label = not a struct
+
+passes_rustc_lint_opt_deny_field_access =
+    `#[rustc_lint_opt_deny_field_access]` should be applied to a field
+    .label = not a field
+
+passes_link_ordinal =
+    attribute should be applied to a foreign function or static
+    .label = not a foreign function or static
+
+passes_collapse_debuginfo =
+    `collapse_debuginfo` attribute should be applied to macro definitions
+    .label = not a macro definition
+
+passes_deprecated_annotation_has_no_effect =
+    this `#[deprecated]` annotation has no effect
+    .suggestion = remove the unnecessary deprecation attribute
+
+passes_unknown_external_lang_item =
+    unknown external lang item: `{$lang_item}`
+
+passes_missing_panic_handler =
+    `#[panic_handler]` function required, but not found
+
+passes_missing_lang_item =
+    language item required, but not found: `{$name}`
+    .note = this can occur when a binary crate with `#![no_std]` is compiled for a target where `{$name}` is defined in the standard library
+    .help = you may be able to compile for a target that doesn't need `{$name}`, specify a target with `--target` or in `.cargo/config`
+
+passes_lang_item_on_incorrect_target =
+    `{$name}` language item must be applied to a {$expected_target}
+    .label = attribute should be applied to a {$expected_target}, not a {$actual_target}
+
+passes_unknown_lang_item =
+    definition of an unknown language item: `{$name}`
+    .label = definition of unknown language item `{$name}`
+
+passes_invalid_attr_at_crate_level =
+    `{$name}` attribute cannot be used at crate level
+    .suggestion = perhaps you meant to use an outer attribute
+
+passes_duplicate_diagnostic_item =
+    duplicate diagnostic item found: `{$name}`.
+
+passes_duplicate_diagnostic_item_in_crate =
+    duplicate diagnostic item in crate `{$crate_name}`: `{$name}`.
+
+passes_diagnostic_item_first_defined =
+    the diagnostic item is first defined here
+    .note = the diagnostic item is first defined in crate `{$orig_crate_name}`.
+
+passes_abi =
+    abi: {$abi}
+
+passes_align =
+    align: {$align}
+
+passes_size =
+    size: {$size}
+
+passes_homogeneous_aggregate =
+    homogeneous_aggregate: {$homogeneous_aggregate}
+
+passes_layout_of =
+    layout_of({$normalized_ty}) = {$ty_layout}
+
+passes_unrecognized_field =
+    unrecognized field name `{$name}`
+
+passes_layout =
+    layout error: {$layout_error}
+
+passes_feature_stable_twice =
+    feature `{$feature}` is declared stable since {$since}, but was previously declared stable since {$prev_since}
+
+passes_feature_previously_declared =
+    feature `{$feature}` is declared {$declared}, but was previously declared {$prev_declared}
+
+passes_expr_not_allowed_in_context =
+    {$expr} is not allowed in a `{$context}`
+
+passes_const_impl_const_trait =
+    const `impl`s must be for traits marked with `#[const_trait]`
+    .note = this trait must be annotated with `#[const_trait]`
+
+passes_break_non_loop =
+    `break` with value from a `{$kind}` loop
+    .label = can only break with a value inside `loop` or breakable block
+    .label2 = you can't `break` with a value in a `{$kind}` loop
+    .suggestion = use `break` on its own without a value inside this `{$kind}` loop
+    .break_expr_suggestion = alternatively, you might have meant to use the available loop label
+
+passes_continue_labeled_block =
+    `continue` pointing to a labeled block
+    .label = labeled blocks cannot be `continue`'d
+    .block_label = labeled block the `continue` points to
+
+passes_break_inside_closure =
+    `{$name}` inside of a closure
+    .label = cannot `{$name}` inside of a closure
+    .closure_label = enclosing closure
+
+passes_break_inside_async_block =
+    `{$name}` inside of an `async` block
+    .label = cannot `{$name}` inside of an `async` block
+    .async_block_label = enclosing `async` block
+
+passes_outside_loop =
+    `{$name}` outside of a loop{$is_break ->
+        [true] {" or labeled block"}
+        *[false] {""}
+    }
+    .label = cannot `{$name}` outside of a loop{$is_break ->
+        [true] {" or labeled block"}
+        *[false] {""}
+    }
+
+passes_unlabeled_in_labeled_block =
+    unlabeled `{$cf_type}` inside of a labeled block
+    .label = `{$cf_type}` statements that would diverge to or through a labeled block need to bear a label
+
+passes_unlabeled_cf_in_while_condition =
+    `break` or `continue` with no label in the condition of a `while` loop
+    .label = unlabeled `{$cf_type}` in the condition of a `while` loop
+
+passes_cannot_inline_naked_function =
+    naked functions cannot be inlined
+
+passes_undefined_naked_function_abi =
+    Rust ABI is unsupported in naked functions
+
+passes_no_patterns =
+    patterns not allowed in naked function parameters
+
+passes_params_not_allowed =
+    referencing function parameters is not allowed in naked functions
+    .help = follow the calling convention in asm block to use parameters
+
+passes_naked_functions_asm_block =
+    naked functions must contain a single asm block
+    .label_multiple_asm = multiple asm blocks are unsupported in naked functions
+    .label_non_asm = non-asm is unsupported in naked functions
+
+passes_naked_functions_operands =
+    only `const` and `sym` operands are supported in naked functions
+
+passes_naked_functions_asm_options =
+    asm options unsupported in naked functions: {$unsupported_options}
+
+passes_naked_functions_must_use_noreturn =
+    asm in naked functions must use `noreturn` option
+    .suggestion = consider specifying that the asm block is responsible for returning from the function
+
+passes_attr_only_on_main =
+    `{$attr}` attribute can only be used on `fn main()`
+
+passes_attr_only_on_root_main =
+    `{$attr}` attribute can only be used on root `fn main()`
+
+passes_attr_only_in_functions =
+    `{$attr}` attribute can only be used on functions
+
+passes_multiple_rustc_main =
+    multiple functions with a `#[rustc_main]` attribute
+    .first = first `#[rustc_main]` function
+    .additional = additional `#[rustc_main]` function
+
+passes_multiple_start_functions =
+    multiple `start` functions
+    .label = multiple `start` functions
+    .previous = previous `#[start]` function here
+
+passes_extern_main =
+    the `main` function cannot be declared in an `extern` block
+
+passes_unix_sigpipe_values =
+    valid values for `#[unix_sigpipe = "..."]` are `inherit`, `sig_ign`, or `sig_dfl`
+
+passes_no_main_function =
+    `main` function not found in crate `{$crate_name}`
+    .here_is_main = here is a function named `main`
+    .one_or_more_possible_main = you have one or more functions named `main` not defined at the crate level
+    .consider_moving_main = consider moving the `main` function definitions
+    .main_must_be_defined_at_crate = the main function must be defined at the crate level{$has_filename ->
+        [true] {" "}(in `{$filename}`)
+        *[false] {""}
+    }
+    .consider_adding_main_to_file = consider adding a `main` function to `{$filename}`
+    .consider_adding_main_at_crate = consider adding a `main` function at the crate level
+    .teach_note = If you don't know the basics of Rust, you can go look to the Rust Book to get started: https://doc.rust-lang.org/book/
+    .non_function_main = non-function item at `crate::main` is found
+
+passes_duplicate_lang_item =
+    found duplicate lang item `{$lang_item_name}`
+    .first_defined_span = the lang item is first defined here
+    .first_defined_crate_depends = the lang item is first defined in crate `{$orig_crate_name}` (which `{$orig_dependency_of}` depends on)
+    .first_defined_crate = the lang item is first defined in crate `{$orig_crate_name}`.
+    .first_definition_local = first definition in the local crate (`{$orig_crate_name}`)
+    .second_definition_local = second definition in the local crate (`{$crate_name}`)
+    .first_definition_path = first definition in `{$orig_crate_name}` loaded from {$orig_path}
+    .second_definition_path = second definition in `{$crate_name}` loaded from {$path}
+
+passes_duplicate_lang_item_crate =
+    duplicate lang item in crate `{$crate_name}`: `{$lang_item_name}`.
+    .first_defined_span = the lang item is first defined here
+    .first_defined_crate_depends = the lang item is first defined in crate `{$orig_crate_name}` (which `{$orig_dependency_of}` depends on)
+    .first_defined_crate = the lang item is first defined in crate `{$orig_crate_name}`.
+    .first_definition_local = first definition in the local crate (`{$orig_crate_name}`)
+    .second_definition_local = second definition in the local crate (`{$crate_name}`)
+    .first_definition_path = first definition in `{$orig_crate_name}` loaded from {$orig_path}
+    .second_definition_path = second definition in `{$crate_name}` loaded from {$path}
+
+passes_duplicate_lang_item_crate_depends =
+    duplicate lang item in crate `{$crate_name}` (which `{$dependency_of}` depends on): `{$lang_item_name}`.
+    .first_defined_span = the lang item is first defined here
+    .first_defined_crate_depends = the lang item is first defined in crate `{$orig_crate_name}` (which `{$orig_dependency_of}` depends on)
+    .first_defined_crate = the lang item is first defined in crate `{$orig_crate_name}`.
+    .first_definition_local = first definition in the local crate (`{$orig_crate_name}`)
+    .second_definition_local = second definition in the local crate (`{$crate_name}`)
+    .first_definition_path = first definition in `{$orig_crate_name}` loaded from {$orig_path}
+    .second_definition_path = second definition in `{$crate_name}` loaded from {$path}
+
+passes_incorrect_target =
+    `{$name}` language item must be applied to a {$kind} with {$at_least ->
+        [true] at least {$num}
+        *[false] {$num}
+    } generic {$num ->
+        [one] argument
+        *[other] arguments
+    }
+    .label = this {$kind} has {$actual_num} generic {$actual_num ->
+        [one] argument
+        *[other] arguments
+    }
+
+passes_useless_assignment =
+    useless assignment of {$is_field_assign ->
+        [true] field
+        *[false] variable
+    } of type `{$ty}` to itself
+
+passes_only_has_effect_on =
+    `#[{$attr_name}]` only has an effect on {$target_name ->
+        [function] functions
+        [module] modules
+        [implementation_block] implementation blocks
+        *[unspecified] (unspecified--this is a compiler bug)
+    }
+
+passes_object_lifetime_err =
+    {$repr}
+
+passes_unrecognized_repr_hint =
+    unrecognized representation hint
+    .help = valid reprs are `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
+
+passes_attr_application_enum =
+    attribute should be applied to an enum
+    .label = not an enum
+
+passes_attr_application_struct =
+    attribute should be applied to a struct
+    .label = not a struct
+
+passes_attr_application_struct_union =
+    attribute should be applied to a struct or union
+    .label = not a struct or union
+
+passes_attr_application_struct_enum_union =
+    attribute should be applied to a struct, enum, or union
+    .label = not a struct, enum, or union
+
+passes_attr_application_struct_enum_function_union =
+    attribute should be applied to a struct, enum, function, or union
+    .label = not a struct, enum, function, or union
+
+passes_transparent_incompatible =
+    transparent {$target} cannot have other repr hints
+
+passes_deprecated_attribute =
+    deprecated attribute must be paired with either stable or unstable attribute
+
+passes_useless_stability =
+    this stability annotation is useless
+    .label = useless stability annotation
+    .item = the stability attribute annotates this item
+
+passes_invalid_stability =
+    invalid stability version found
+    .label = invalid stability version
+    .item = the stability attribute annotates this item
+
+passes_cannot_stabilize_deprecated =
+    an API can't be stabilized after it is deprecated
+    .label = invalid version
+    .item = the stability attribute annotates this item
+
+passes_invalid_deprecation_version =
+    invalid deprecation version found
+    .label = invalid deprecation version
+    .item = the stability attribute annotates this item
+
+passes_missing_stability_attr =
+    {$descr} has missing stability attribute
+
+passes_missing_const_stab_attr =
+    {$descr} has missing const stability attribute
+
+passes_trait_impl_const_stable =
+    trait implementations cannot be const stable yet
+    .note = see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
+
+passes_feature_only_on_nightly =
+    `#![feature]` may not be used on the {$release_channel} release channel
+
+passes_unknown_feature =
+    unknown feature `{$feature}`
+
+passes_implied_feature_not_exist =
+    feature `{$implied_by}` implying `{$feature}` does not exist
+
+passes_duplicate_feature_err =
+    the feature `{$feature}` has already been declared
+
+passes_missing_const_err =
+    attributes `#[rustc_const_unstable]` and `#[rustc_const_stable]` require the function or method to be `const`
+    .help = make the function or method const
+    .label = attribute specified here
+
+passes_dead_codes =
+    { $multiple ->
+      *[true] multiple {$descr}s are
+       [false] { $num ->
+         [one] {$descr} {$name_list} is
+        *[other] {$descr}s {$name_list} are
+       }
+    } never {$participle}
+
+passes_change_fields_to_be_of_unit_type =
+    consider changing the { $num ->
+      [one] field
+     *[other] fields
+    } to be of unit type to suppress this warning while preserving the field numbering, or remove the { $num ->
+      [one] field
+     *[other] fields
+    }
+
+passes_parent_info =
+    {$num ->
+      [one] {$descr}
+     *[other] {$descr}s
+    } in this {$parent_descr}
+
+passes_ignored_derived_impls =
+    `{$name}` has {$trait_list_len ->
+      [one] a derived impl
+     *[other] derived impls
+    } for the {$trait_list_len ->
+      [one] trait {$trait_list}, but this is
+     *[other] traits {$trait_list}, but these are
+    } intentionally ignored during dead code analysis
+
+passes_proc_macro_typeerror = mismatched {$kind} signature
+    .label = found {$found}, expected type `proc_macro::TokenStream`
+    .note = {$kind}s must have a signature of `{$expected_signature}`
+
+passes_proc_macro_diff_arg_count = mismatched {$kind} signature
+    .label = found unexpected {$count ->
+      [one] argument
+     *[other] arguments
+    }
+    .note = {$kind}s must have a signature of `{$expected_signature}`
+
+passes_proc_macro_missing_args = mismatched {$kind} signature
+    .label = {$kind} must have {$expected_input_count ->
+      [one] one argument
+     *[other] two arguments
+    } of type `proc_macro::TokenStream`
+
+passes_proc_macro_invalid_abi = proc macro functions may not be `extern "{$abi}"`
+
+passes_proc_macro_unsafe = proc macro functions may not be `unsafe`
+
+passes_skipping_const_checks = skipping const checks
diff --git a/compiler/rustc_passes/src/check_attr.rs b/compiler/rustc_passes/src/check_attr.rs
index 8ad4a5ef958..bb09dcbdd69 100644
--- a/compiler/rustc_passes/src/check_attr.rs
+++ b/compiler/rustc_passes/src/check_attr.rs
@@ -4,10 +4,10 @@
 //! conflicts between multiple such attributes attached to the same
 //! item.
 
-use crate::errors;
+use crate::{errors, fluent_generated as fluent};
 use rustc_ast::{ast, AttrStyle, Attribute, LitKind, MetaItemKind, MetaItemLit, NestedMetaItem};
 use rustc_data_structures::fx::FxHashMap;
-use rustc_errors::{fluent, Applicability, IntoDiagnosticArg, MultiSpan};
+use rustc_errors::{Applicability, IntoDiagnosticArg, MultiSpan};
 use rustc_expand::base::resolve_path;
 use rustc_feature::{AttributeDuplicates, AttributeType, BuiltinAttribute, BUILTIN_ATTRIBUTE_MAP};
 use rustc_hir as hir;
@@ -935,15 +935,15 @@ impl CheckAttrVisitor<'_> {
                             src.insert(1, '!');
                             err.span_suggestion_verbose(
                                 attr.span,
-                                fluent::suggestion,
+                                fluent::passes_suggestion,
                                 src,
                                 Applicability::MaybeIncorrect,
                             );
                         } else {
-                            err.span_help(attr.span, fluent::help);
+                            err.span_help(attr.span, fluent::passes_help);
                         }
                     }
-                    err.note(fluent::note);
+                    err.note(fluent::passes_note);
                     err
                 },
             );
diff --git a/compiler/rustc_passes/src/errors.rs b/compiler/rustc_passes/src/errors.rs
index 68b098e3457..82fc3eeff94 100644
--- a/compiler/rustc_passes/src/errors.rs
+++ b/compiler/rustc_passes/src/errors.rs
@@ -3,6 +3,7 @@ use std::{
     path::{Path, PathBuf},
 };
 
+use crate::fluent_generated as fluent;
 use rustc_ast::Label;
 use rustc_errors::{
     error_code, Applicability, DiagnosticSymbolList, ErrorGuaranteed, IntoDiagnostic, MultiSpan,
@@ -261,7 +262,7 @@ pub struct DocKeywordConflict {
 pub struct DocInlineOnlyUse {
     #[label]
     pub attr_span: Span,
-    #[label(not_a_use_item_label)]
+    #[label(passes_not_a_use_item_label)]
     pub item_span: Option<Span>,
 }
 
@@ -300,7 +301,7 @@ pub struct DocTestUnknownAny {
 #[derive(LintDiagnostic)]
 #[diag(passes_doc_test_unknown_spotlight)]
 #[note]
-#[note(no_op_note)]
+#[note(passes_no_op_note)]
 pub struct DocTestUnknownSpotlight {
     pub path: String,
     #[suggestion(style = "short", applicability = "machine-applicable", code = "notable_trait")]
@@ -573,9 +574,9 @@ pub struct DebugVisualizerPlacement {
 
 #[derive(Diagnostic)]
 #[diag(passes_debug_visualizer_invalid)]
-#[note(note_1)]
-#[note(note_2)]
-#[note(note_3)]
+#[note(passes_note_1)]
+#[note(passes_note_2)]
+#[note(passes_note_3)]
 pub struct DebugVisualizerInvalid {
     #[primary_span]
     pub span: Span,
@@ -782,7 +783,7 @@ impl IntoDiagnostic<'_> for InvalidAttrAtCrateLevel {
         self,
         handler: &'_ rustc_errors::Handler,
     ) -> rustc_errors::DiagnosticBuilder<'_, ErrorGuaranteed> {
-        let mut diag = handler.struct_err(rustc_errors::fluent::passes_invalid_attr_at_crate_level);
+        let mut diag = handler.struct_err(fluent::passes_invalid_attr_at_crate_level);
         diag.set_span(self.span);
         diag.set_arg("name", self.name);
         // Only emit an error with a suggestion if we can create a string out
@@ -791,7 +792,7 @@ impl IntoDiagnostic<'_> for InvalidAttrAtCrateLevel {
             let replacement = src.replace("#!", "#");
             diag.span_suggestion_verbose(
                 self.span,
-                rustc_errors::fluent::suggestion,
+                fluent::passes_suggestion,
                 replacement,
                 rustc_errors::Applicability::MachineApplicable,
             );
@@ -917,17 +918,17 @@ impl<'a> IntoDiagnostic<'_> for BreakNonLoop<'a> {
     ) -> rustc_errors::DiagnosticBuilder<'_, ErrorGuaranteed> {
         let mut diag = handler.struct_span_err_with_code(
             self.span,
-            rustc_errors::fluent::passes_break_non_loop,
+            fluent::passes_break_non_loop,
             error_code!(E0571),
         );
         diag.set_arg("kind", self.kind);
-        diag.span_label(self.span, rustc_errors::fluent::label);
+        diag.span_label(self.span, fluent::passes_label);
         if let Some(head) = self.head {
-            diag.span_label(head, rustc_errors::fluent::label2);
+            diag.span_label(head, fluent::passes_label2);
         }
         diag.span_suggestion(
             self.span,
-            rustc_errors::fluent::suggestion,
+            fluent::passes_suggestion,
             self.suggestion,
             Applicability::MaybeIncorrect,
         );
@@ -945,7 +946,7 @@ impl<'a> IntoDiagnostic<'_> for BreakNonLoop<'a> {
                 _ => {
                     diag.span_suggestion(
                         self.break_expr_span,
-                        rustc_errors::fluent::break_expr_suggestion,
+                        fluent::passes_break_expr_suggestion,
                         label.ident,
                         Applicability::MaybeIncorrect,
                     );
@@ -962,7 +963,7 @@ pub struct ContinueLabeledBlock {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(block_label)]
+    #[label(passes_block_label)]
     pub block_span: Span,
 }
 
@@ -972,7 +973,7 @@ pub struct BreakInsideClosure<'a> {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(closure_label)]
+    #[label(passes_closure_label)]
     pub closure_span: Span,
     pub name: &'a str,
 }
@@ -983,7 +984,7 @@ pub struct BreakInsideAsyncBlock<'a> {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(async_block_label)]
+    #[label(passes_async_block_label)]
     pub closure_span: Span,
     pub name: &'a str,
 }
@@ -1056,14 +1057,14 @@ impl IntoDiagnostic<'_> for NakedFunctionsAsmBlock {
     ) -> rustc_errors::DiagnosticBuilder<'_, ErrorGuaranteed> {
         let mut diag = handler.struct_span_err_with_code(
             self.span,
-            rustc_errors::fluent::passes_naked_functions_asm_block,
+            fluent::passes_naked_functions_asm_block,
             error_code!(E0787),
         );
         for span in self.multiple_asms.iter() {
-            diag.span_label(*span, rustc_errors::fluent::label_multiple_asm);
+            diag.span_label(*span, fluent::passes_label_multiple_asm);
         }
         for span in self.non_asms.iter() {
-            diag.span_label(*span, rustc_errors::fluent::label_non_asm);
+            diag.span_label(*span, fluent::passes_label_non_asm);
         }
         diag
     }
@@ -1122,9 +1123,9 @@ pub struct AttrOnlyInFunctions {
 pub struct MultipleRustcMain {
     #[primary_span]
     pub span: Span,
-    #[label(first)]
+    #[label(passes_first)]
     pub first: Span,
-    #[label(additional)]
+    #[label(passes_additional)]
     pub additional: Span,
 }
 
@@ -1135,7 +1136,7 @@ pub struct MultipleStartFunctions {
     pub span: Span,
     #[label]
     pub labeled: Span,
-    #[label(previous)]
+    #[label(passes_previous)]
     pub previous: Span,
 }
 
@@ -1180,7 +1181,7 @@ impl<'a> IntoDiagnostic<'a> for NoMainErr {
     ) -> rustc_errors::DiagnosticBuilder<'a, ErrorGuaranteed> {
         let mut diag = handler.struct_span_err_with_code(
             DUMMY_SP,
-            rustc_errors::fluent::passes_no_main_function,
+            fluent::passes_no_main_function,
             error_code!(E0601),
         );
         diag.set_arg("crate_name", self.crate_name);
@@ -1188,16 +1189,16 @@ impl<'a> IntoDiagnostic<'a> for NoMainErr {
         diag.set_arg("has_filename", self.has_filename);
         let note = if !self.non_main_fns.is_empty() {
             for &span in &self.non_main_fns {
-                diag.span_note(span, rustc_errors::fluent::here_is_main);
+                diag.span_note(span, fluent::passes_here_is_main);
             }
-            diag.note(rustc_errors::fluent::one_or_more_possible_main);
-            diag.help(rustc_errors::fluent::consider_moving_main);
+            diag.note(fluent::passes_one_or_more_possible_main);
+            diag.help(fluent::passes_consider_moving_main);
             // There were some functions named `main` though. Try to give the user a hint.
-            rustc_errors::fluent::main_must_be_defined_at_crate
+            fluent::passes_main_must_be_defined_at_crate
         } else if self.has_filename {
-            rustc_errors::fluent::consider_adding_main_to_file
+            fluent::passes_consider_adding_main_to_file
         } else {
-            rustc_errors::fluent::consider_adding_main_at_crate
+            fluent::passes_consider_adding_main_at_crate
         };
         if self.file_empty {
             diag.note(note);
@@ -1208,11 +1209,11 @@ impl<'a> IntoDiagnostic<'a> for NoMainErr {
 
         if let Some(main_def) = self.main_def_opt && main_def.opt_fn_def_id().is_none(){
             // There is something at `crate::main`, but it is not a function definition.
-            diag.span_label(main_def.span, rustc_errors::fluent::non_function_main);
+            diag.span_label(main_def.span, fluent::passes_non_function_main);
         }
 
         if self.add_teach_note {
-            diag.note(rustc_errors::fluent::teach_note);
+            diag.note(fluent::passes_teach_note);
         }
         diag
     }
@@ -1241,12 +1242,9 @@ impl IntoDiagnostic<'_> for DuplicateLangItem {
     ) -> rustc_errors::DiagnosticBuilder<'_, ErrorGuaranteed> {
         let mut diag = handler.struct_err_with_code(
             match self.duplicate {
-                Duplicate::Plain => rustc_errors::fluent::passes_duplicate_lang_item,
-
-                Duplicate::Crate => rustc_errors::fluent::passes_duplicate_lang_item_crate,
-                Duplicate::CrateDepends => {
-                    rustc_errors::fluent::passes_duplicate_lang_item_crate_depends
-                }
+                Duplicate::Plain => fluent::passes_duplicate_lang_item,
+                Duplicate::Crate => fluent::passes_duplicate_lang_item_crate,
+                Duplicate::CrateDepends => fluent::passes_duplicate_lang_item_crate_depends,
             },
             error_code!(E0152),
         );
@@ -1261,24 +1259,24 @@ impl IntoDiagnostic<'_> for DuplicateLangItem {
             diag.set_span(span);
         }
         if let Some(span) = self.first_defined_span {
-            diag.span_note(span, rustc_errors::fluent::first_defined_span);
+            diag.span_note(span, fluent::passes_first_defined_span);
         } else {
             if self.orig_dependency_of.is_empty() {
-                diag.note(rustc_errors::fluent::first_defined_crate);
+                diag.note(fluent::passes_first_defined_crate);
             } else {
-                diag.note(rustc_errors::fluent::first_defined_crate_depends);
+                diag.note(fluent::passes_first_defined_crate_depends);
             }
 
             if self.orig_is_local {
-                diag.note(rustc_errors::fluent::first_definition_local);
+                diag.note(fluent::passes_first_definition_local);
             } else {
-                diag.note(rustc_errors::fluent::first_definition_path);
+                diag.note(fluent::passes_first_definition_path);
             }
 
             if self.is_local {
-                diag.note(rustc_errors::fluent::second_definition_local);
+                diag.note(fluent::passes_second_definition_local);
             } else {
-                diag.note(rustc_errors::fluent::second_definition_path);
+                diag.note(fluent::passes_second_definition_path);
             }
         }
         diag
@@ -1389,7 +1387,7 @@ pub struct UselessStability {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(item)]
+    #[label(passes_item)]
     pub item_sp: Span,
 }
 
@@ -1399,7 +1397,7 @@ pub struct InvalidStability {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(item)]
+    #[label(passes_item)]
     pub item_sp: Span,
 }
 
@@ -1409,7 +1407,7 @@ pub struct CannotStabilizeDeprecated {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(item)]
+    #[label(passes_item)]
     pub item_sp: Span,
 }
 
@@ -1419,7 +1417,7 @@ pub struct InvalidDeprecationVersion {
     #[primary_span]
     #[label]
     pub span: Span,
-    #[label(item)]
+    #[label(passes_item)]
     pub item_sp: Span,
 }
 
diff --git a/compiler/rustc_passes/src/lib.rs b/compiler/rustc_passes/src/lib.rs
index 6e621b7eb5e..0cb8424082c 100644
--- a/compiler/rustc_passes/src/lib.rs
+++ b/compiler/rustc_passes/src/lib.rs
@@ -18,6 +18,8 @@ extern crate rustc_middle;
 #[macro_use]
 extern crate tracing;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
 use rustc_middle::ty::query::Providers;
 
 mod check_attr;
@@ -40,6 +42,8 @@ pub mod stability;
 mod upvars;
 mod weak_lang_items;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 pub fn provide(providers: &mut Providers) {
     check_attr::provide(providers);
     check_const::provide(providers);
diff --git a/compiler/rustc_plugin_impl/locales/en-US.ftl b/compiler/rustc_plugin_impl/locales/en-US.ftl
new file mode 100644
index 00000000000..8db32a42c1d
--- /dev/null
+++ b/compiler/rustc_plugin_impl/locales/en-US.ftl
@@ -0,0 +1,4 @@
+plugin_impl_load_plugin_error = {$msg}
+
+plugin_impl_malformed_plugin_attribute = malformed `plugin` attribute
+    .label = malformed attribute
diff --git a/compiler/rustc_plugin_impl/src/lib.rs b/compiler/rustc_plugin_impl/src/lib.rs
index 9ac27c65da8..3f03eef9ee3 100644
--- a/compiler/rustc_plugin_impl/src/lib.rs
+++ b/compiler/rustc_plugin_impl/src/lib.rs
@@ -11,11 +11,15 @@
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_lint::LintStore;
+use rustc_macros::fluent_messages;
 
 mod errors;
 pub mod load;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 /// Structure used to register plugins.
 ///
 /// A plugin registrar function takes an `&mut Registry` and should call
diff --git a/compiler/rustc_privacy/locales/en-US.ftl b/compiler/rustc_privacy/locales/en-US.ftl
new file mode 100644
index 00000000000..a26d1b2b381
--- /dev/null
+++ b/compiler/rustc_privacy/locales/en-US.ftl
@@ -0,0 +1,23 @@
+privacy_field_is_private = field `{$field_name}` of {$variant_descr} `{$def_path_str}` is private
+privacy_field_is_private_is_update_syntax_label = field `{$field_name}` is private
+privacy_field_is_private_label = private field
+
+privacy_item_is_private = {$kind} `{$descr}` is private
+    .label = private {$kind}
+privacy_unnamed_item_is_private = {$kind} is private
+    .label = private {$kind}
+
+privacy_in_public_interface = {$vis_descr} {$kind} `{$descr}` in public interface
+    .label = can't leak {$vis_descr} {$kind}
+    .visibility_label = `{$descr}` declared as {$vis_descr}
+
+privacy_report_effective_visibility = {$descr}
+
+privacy_from_private_dep_in_public_interface =
+    {$kind} `{$descr}` from private dependency '{$krate}' in public interface
+
+privacy_private_in_public_lint =
+    {$vis_descr} {$kind} `{$descr}` in public interface (error {$kind ->
+        [trait] E0445
+        *[other] E0446
+    })
diff --git a/compiler/rustc_privacy/src/errors.rs b/compiler/rustc_privacy/src/errors.rs
index a6c95f1a815..72b53eefa08 100644
--- a/compiler/rustc_privacy/src/errors.rs
+++ b/compiler/rustc_privacy/src/errors.rs
@@ -57,7 +57,7 @@ pub struct InPublicInterfaceTraits<'a> {
     pub vis_descr: &'static str,
     pub kind: &'a str,
     pub descr: DiagnosticArgFromDisplay<'a>,
-    #[label(visibility_label)]
+    #[label(privacy_visibility_label)]
     pub vis_span: Span,
 }
 
@@ -71,7 +71,7 @@ pub struct InPublicInterface<'a> {
     pub vis_descr: &'static str,
     pub kind: &'a str,
     pub descr: DiagnosticArgFromDisplay<'a>,
-    #[label(visibility_label)]
+    #[label(privacy_visibility_label)]
     pub vis_span: Span,
 }
 
diff --git a/compiler/rustc_privacy/src/lib.rs b/compiler/rustc_privacy/src/lib.rs
index 58dfca75c65..9e856bb8a08 100644
--- a/compiler/rustc_privacy/src/lib.rs
+++ b/compiler/rustc_privacy/src/lib.rs
@@ -16,11 +16,13 @@ use rustc_ast::MacroDef;
 use rustc_attr as attr;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::intern::Interned;
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID};
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::{AssocItemKind, HirIdSet, ItemId, Node, PatKind};
+use rustc_macros::fluent_messages;
 use rustc_middle::bug;
 use rustc_middle::hir::nested_filter;
 use rustc_middle::middle::privacy::{EffectiveVisibilities, Level};
@@ -44,6 +46,8 @@ use errors::{
     UnnamedItemIsPrivate,
 };
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 ////////////////////////////////////////////////////////////////////////////////
 /// Generic infrastructure used to implement specific visitors below.
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/compiler/rustc_query_system/locales/en-US.ftl b/compiler/rustc_query_system/locales/en-US.ftl
new file mode 100644
index 00000000000..870e824039c
--- /dev/null
+++ b/compiler/rustc_query_system/locales/en-US.ftl
@@ -0,0 +1,30 @@
+query_system_reentrant = internal compiler error: re-entrant incremental verify failure, suppressing message
+
+query_system_increment_compilation = internal compiler error: encountered incremental compilation error with {$dep_node}
+    .help = This is a known issue with the compiler. Run {$run_cmd} to allow your project to compile
+
+query_system_increment_compilation_note1 = Please follow the instructions below to create a bug report with the provided information
+query_system_increment_compilation_note2 = See <https://github.com/rust-lang/rust/issues/84970> for more information
+
+query_system_cycle = cycle detected when {$stack_bottom}
+
+query_system_cycle_usage = cycle used when {$usage}
+
+query_system_cycle_stack_single = ...which immediately requires {$stack_bottom} again
+
+query_system_cycle_stack_middle = ...which requires {$desc}...
+
+query_system_cycle_stack_multiple = ...which again requires {$stack_bottom}, completing the cycle
+
+query_system_cycle_recursive_ty_alias = type aliases cannot be recursive
+query_system_cycle_recursive_ty_alias_help1 = consider using a struct, enum, or union instead to break the cycle
+query_system_cycle_recursive_ty_alias_help2 = see <https://doc.rust-lang.org/reference/types.html#recursive-types> for more information
+
+query_system_cycle_recursive_trait_alias = trait aliases cannot be recursive
+
+query_system_cycle_which_requires = ...which requires {$desc}...
+
+query_system_query_overflow = queries overflow the depth limit!
+    .help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
+
+query_system_layout_of_depth = query depth increased by {$depth} when {$desc}
diff --git a/compiler/rustc_query_system/src/lib.rs b/compiler/rustc_query_system/src/lib.rs
index 623be668464..6cc4c9a7e1e 100644
--- a/compiler/rustc_query_system/src/lib.rs
+++ b/compiler/rustc_query_system/src/lib.rs
@@ -15,6 +15,9 @@ extern crate rustc_data_structures;
 #[macro_use]
 extern crate rustc_macros;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
 pub mod cache;
 pub mod dep_graph;
 mod error;
@@ -26,3 +29,5 @@ pub use error::HandleCycleError;
 pub use error::LayoutOfDepth;
 pub use error::QueryOverflow;
 pub use values::Value;
+
+fluent_messages! { "../locales/en-US.ftl" }
diff --git a/compiler/rustc_resolve/locales/en-US.ftl b/compiler/rustc_resolve/locales/en-US.ftl
new file mode 100644
index 00000000000..817bb83ed78
--- /dev/null
+++ b/compiler/rustc_resolve/locales/en-US.ftl
@@ -0,0 +1,211 @@
+resolve_parent_module_reset_for_binding =
+    parent module is reset for binding
+
+resolve_ampersand_used_without_explicit_lifetime_name =
+    `&` without an explicit lifetime name cannot be used here
+    .note = explicit lifetime name needed here
+
+resolve_underscore_lifetime_name_cannot_be_used_here =
+    `'_` cannot be used here
+    .note = `'_` is a reserved lifetime name
+
+resolve_crate_may_not_be_imported =
+    `$crate` may not be imported
+
+resolve_crate_root_imports_must_be_named_explicitly =
+    crate root imports need to be explicitly named: `use crate as name;`
+
+resolve_generic_params_from_outer_function =
+    can't use generic parameters from outer function
+    .label = use of generic parameter from outer function
+    .suggestion = try using a local generic parameter instead
+
+resolve_self_type_implicitly_declared_by_impl =
+    `Self` type implicitly declared here, by this `impl`
+
+resolve_cannot_use_self_type_here =
+    can't use `Self` here
+
+resolve_use_a_type_here_instead =
+    use a type here instead
+
+resolve_type_param_from_outer_fn =
+    type parameter from outer function
+
+resolve_const_param_from_outer_fn =
+    const parameter from outer function
+
+resolve_try_using_local_generic_parameter =
+    try using a local generic parameter instead
+
+resolve_try_adding_local_generic_param_on_method =
+    try adding a local generic parameter in this method instead
+
+resolve_help_try_using_local_generic_param =
+    try using a local generic paramter instead
+
+resolve_name_is_already_used_as_generic_parameter =
+    the name `{$name}` is already used for a generic parameter in this item's generic parameters
+    .label = already used
+    .first_use_of_name = first use of `{$name}`
+
+resolve_method_not_member_of_trait =
+    method `{$method}` is not a member of trait `{$trait_}`
+    .label = not a member of trait `{$trait_}`
+
+resolve_associated_fn_with_similar_name_exists =
+    there is an associated function with a similar name
+
+resolve_type_not_member_of_trait =
+    type `{$type_}` is not a member of trait `{$trait_}`
+    .label = not a member of trait `{$trait_}`
+
+resolve_associated_type_with_similar_name_exists =
+    there is an associated type with a similar name
+
+resolve_const_not_member_of_trait =
+    const `{$const_}` is not a member of trait `{$trait_}`
+    .label = not a member of trait `{$trait_}`
+
+resolve_associated_const_with_similar_name_exists =
+    there is an associated constant with a similar name
+
+resolve_variable_bound_with_different_mode =
+    variable `{$variable_name}` is bound inconsistently across alternatives separated by `|`
+    .label = bound in different ways
+    .first_binding_span = first binding
+
+resolve_ident_bound_more_than_once_in_parameter_list =
+    identifier `{$identifier}` is bound more than once in this parameter list
+    .label = used as parameter more than once
+
+resolve_ident_bound_more_than_once_in_same_pattern =
+    identifier `{$identifier}` is bound more than once in the same pattern
+    .label = used in a pattern more than once
+
+resolve_undeclared_label =
+    use of undeclared label `{$name}`
+    .label = undeclared label `{$name}`
+
+resolve_label_with_similar_name_reachable =
+    a label with a similar name is reachable
+
+resolve_try_using_similarly_named_label =
+    try using similarly named label
+
+resolve_unreachable_label_with_similar_name_exists =
+    a label with a similar name exists but is unreachable
+
+resolve_self_import_can_only_appear_once_in_the_list =
+    `self` import can only appear once in an import list
+    .label = can only appear once in an import list
+
+resolve_self_import_only_in_import_list_with_non_empty_prefix =
+    `self` import can only appear in an import list with a non-empty prefix
+    .label = can only appear in an import list with a non-empty prefix
+
+resolve_cannot_capture_dynamic_environment_in_fn_item =
+    can't capture dynamic environment in a fn item
+    .help = use the `|| {"{"} ... {"}"}` closure form instead
+
+resolve_attempt_to_use_non_constant_value_in_constant =
+    attempt to use a non-constant value in a constant
+
+resolve_attempt_to_use_non_constant_value_in_constant_with_suggestion =
+    consider using `{$suggestion}` instead of `{$current}`
+
+resolve_attempt_to_use_non_constant_value_in_constant_label_with_suggestion =
+    non-constant value
+
+resolve_attempt_to_use_non_constant_value_in_constant_without_suggestion =
+    this would need to be a `{$suggestion}`
+
+resolve_self_imports_only_allowed_within =
+    `self` imports are only allowed within a {"{"} {"}"} list
+
+resolve_self_imports_only_allowed_within_suggestion =
+    consider importing the module directly
+
+resolve_self_imports_only_allowed_within_multipart_suggestion =
+    alternatively, use the multi-path `use` syntax to import `self`
+
+resolve_binding_shadows_something_unacceptable =
+    {$shadowing_binding}s cannot shadow {$shadowed_binding}s
+    .label = cannot be named the same as {$article} {$shadowed_binding}
+    .label_shadowed_binding = the {$shadowed_binding} `{$name}` is {$participle} here
+
+resolve_binding_shadows_something_unacceptable_suggestion =
+    try specify the pattern arguments
+
+resolve_forward_declared_generic_param =
+    generic parameters with a default cannot use forward declared identifiers
+    .label = defaulted generic parameters cannot be forward declared
+
+resolve_param_in_ty_of_const_param =
+    the type of const parameters must not depend on other generic parameters
+    .label = the type must not depend on the parameter `{$name}`
+
+resolve_self_in_generic_param_default =
+    generic parameters cannot use `Self` in their defaults
+    .label = `Self` in generic parameter default
+
+resolve_param_in_non_trivial_anon_const =
+    generic parameters may not be used in const operations
+    .label = cannot perform const operation using `{$name}`
+
+resolve_param_in_non_trivial_anon_const_help =
+    use `#![feature(generic_const_exprs)]` to allow generic const expressions
+
+resolve_param_in_non_trivial_anon_const_sub_type =
+    type parameters may not be used in const expressions
+
+resolve_param_in_non_trivial_anon_const_sub_non_type =
+    const parameters may only be used as standalone arguments, i.e. `{$name}`
+
+resolve_unreachable_label =
+    use of unreachable label `{$name}`
+    .label = unreachable label `{$name}`
+    .label_definition_span = unreachable label defined here
+    .note = labels are unreachable through functions, closures, async blocks and modules
+
+resolve_unreachable_label_suggestion_use_similarly_named =
+    try using similarly named label
+
+resolve_unreachable_label_similar_name_reachable =
+    a label with a similar name is reachable
+
+resolve_unreachable_label_similar_name_unreachable =
+    a label with a similar name exists but is also unreachable
+
+resolve_trait_impl_mismatch =
+    item `{$name}` is an associated {$kind}, which doesn't match its trait `{$trait_path}`
+    .label = does not match trait
+    .label_trait_item = item in trait
+
+resolve_invalid_asm_sym =
+    invalid `sym` operand
+    .label = is a local variable
+    .help = `sym` operands must refer to either a function or a static
+
+resolve_trait_impl_duplicate =
+    duplicate definitions with name `{$name}`:
+    .label = duplicate definition
+    .old_span_label = previous definition here
+    .trait_item_span = item in trait
+
+resolve_relative_2018 =
+    relative paths are not supported in visibilities in 2018 edition or later
+    .suggestion = try
+
+resolve_ancestor_only =
+    visibilities can only be restricted to ancestor modules
+
+resolve_expected_found =
+    expected module, found {$res} `{$path_str}`
+    .label = not a module
+
+resolve_indeterminate =
+    cannot determine resolution for the visibility
+
+resolve_module_only =
+    visibility must resolve to a module
diff --git a/compiler/rustc_resolve/src/errors.rs b/compiler/rustc_resolve/src/errors.rs
index 2c442774667..867363f4246 100644
--- a/compiler/rustc_resolve/src/errors.rs
+++ b/compiler/rustc_resolve/src/errors.rs
@@ -38,7 +38,7 @@ pub(crate) struct NameAlreadyUsedInParameterList {
     #[primary_span]
     #[label]
     pub(crate) span: Span,
-    #[label(first_use_of_name)]
+    #[label(resolve_first_use_of_name)]
     pub(crate) first_use_span: Span,
     pub(crate) name: Symbol,
 }
@@ -121,7 +121,7 @@ pub(crate) struct VariableBoundWithDifferentMode {
     #[primary_span]
     #[label]
     pub(crate) span: Span,
-    #[label(first_binding_span)]
+    #[label(resolve_first_binding_span)]
     pub(crate) first_binding_span: Span,
     pub(crate) variable_name: Symbol,
 }
@@ -293,7 +293,7 @@ pub(crate) struct BindingShadowsSomethingUnacceptable<'a> {
     pub(crate) article: &'a str,
     #[subdiagnostic]
     pub(crate) sub_suggestion: Option<BindingShadowsSomethingUnacceptableSuggestion>,
-    #[label(label_shadowed_binding)]
+    #[label(resolve_label_shadowed_binding)]
     pub(crate) shadowed_binding_span: Span,
     pub(crate) participle: &'a str,
     pub(crate) name: Symbol,
@@ -369,7 +369,7 @@ pub(crate) struct UnreachableLabel {
     #[label]
     pub(crate) span: Span,
     pub(crate) name: Symbol,
-    #[label(label_definition_span)]
+    #[label(resolve_label_definition_span)]
     pub(crate) definition_span: Span,
     #[subdiagnostic]
     pub(crate) sub_suggestion: Option<UnreachableLabelSubSuggestion>,
@@ -413,7 +413,7 @@ pub(crate) struct TraitImplMismatch {
     pub(crate) span: Span,
     pub(crate) name: Symbol,
     pub(crate) kind: String,
-    #[label(label_trait_item)]
+    #[label(resolve_label_trait_item)]
     pub(crate) trait_item_span: Span,
     pub(crate) trait_path: String,
     pub(crate) code: String,
@@ -434,9 +434,9 @@ pub(crate) struct TraitImplDuplicate {
     #[primary_span]
     #[label]
     pub(crate) span: Span,
-    #[label(old_span_label)]
+    #[label(resolve_old_span_label)]
     pub(crate) old_span: Span,
-    #[label(trait_item_span)]
+    #[label(resolve_trait_item_span)]
     pub(crate) trait_item_span: Span,
     pub(crate) name: Symbol,
 }
diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index 66034baaa0b..d36ee369b43 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -28,7 +28,9 @@ use rustc_ast::{AngleBracketedArg, Crate, Expr, ExprKind, GenericArg, GenericArg
 use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_data_structures::intern::Interned;
 use rustc_data_structures::sync::{Lrc, MappedReadGuard};
-use rustc_errors::{Applicability, DiagnosticBuilder, ErrorGuaranteed};
+use rustc_errors::{
+    Applicability, DiagnosticBuilder, DiagnosticMessage, ErrorGuaranteed, SubdiagnosticMessage,
+};
 use rustc_expand::base::{DeriveResolutions, SyntaxExtension, SyntaxExtensionKind};
 use rustc_hir::def::Namespace::{self, *};
 use rustc_hir::def::{self, CtorOf, DefKind, DocLinkResMap, LifetimeRes, PartialRes, PerNS};
@@ -37,6 +39,7 @@ use rustc_hir::def_id::{CRATE_DEF_ID, LOCAL_CRATE};
 use rustc_hir::definitions::DefPathData;
 use rustc_hir::TraitCandidate;
 use rustc_index::vec::IndexVec;
+use rustc_macros::fluent_messages;
 use rustc_metadata::creader::{CStore, CrateLoader};
 use rustc_middle::metadata::ModChild;
 use rustc_middle::middle::privacy::EffectiveVisibilities;
@@ -77,6 +80,8 @@ mod late;
 mod macros;
 pub mod rustdoc;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 enum Weak {
     Yes,
     No,
diff --git a/compiler/rustc_session/locales/en-US.ftl b/compiler/rustc_session/locales/en-US.ftl
new file mode 100644
index 00000000000..fe553edab42
--- /dev/null
+++ b/compiler/rustc_session/locales/en-US.ftl
@@ -0,0 +1,95 @@
+session_incorrect_cgu_reuse_type =
+    CGU-reuse for `{$cgu_user_name}` is `{$actual_reuse}` but should be {$at_least ->
+    [one] {"at least "}
+    *[other] {""}
+    }`{$expected_reuse}`
+
+session_cgu_not_recorded =
+    CGU-reuse for `{$cgu_user_name}` is (mangled: `{$cgu_name}`) was not recorded`
+
+session_feature_gate_error = {$explain}
+
+session_feature_diagnostic_for_issue =
+    see issue #{$n} <https://github.com/rust-lang/rust/issues/{$n}> for more information
+
+session_feature_diagnostic_help =
+    add `#![feature({$feature})]` to the crate attributes to enable
+
+session_not_circumvent_feature = `-Zunleash-the-miri-inside-of-you` may not be used to circumvent feature gates, except when testing error paths in the CTFE engine
+
+session_profile_use_file_does_not_exist = file `{$path}` passed to `-C profile-use` does not exist.
+
+session_linker_plugin_lto_windows_not_supported = linker plugin based LTO is not supported together with `-C prefer-dynamic` when targeting Windows-like targets
+
+session_profile_sample_use_file_does_not_exist = file `{$path}` passed to `-C profile-sample-use` does not exist.
+
+session_target_requires_unwind_tables = target requires unwind tables, they cannot be disabled with `-C force-unwind-tables=no`
+
+session_instrumentation_not_supported = {$us} instrumentation is not supported for this target
+
+session_sanitizer_not_supported = {$us} sanitizer is not supported for this target
+
+session_sanitizers_not_supported = {$us} sanitizers are not supported for this target
+
+session_cannot_mix_and_match_sanitizers = `-Zsanitizer={$first}` is incompatible with `-Zsanitizer={$second}`
+
+session_cannot_enable_crt_static_linux = sanitizer is incompatible with statically linked libc, disable it using `-C target-feature=-crt-static`
+
+session_sanitizer_cfi_enabled = `-Zsanitizer=cfi` requires `-Clto`
+
+session_unstable_virtual_function_elimination = `-Zvirtual-function-elimination` requires `-Clto`
+
+session_unsupported_dwarf_version = requested DWARF version {$dwarf_version} is greater than 5
+
+session_target_stack_protector_not_supported = `-Z stack-protector={$stack_protector}` is not supported for target {$target_triple} and will be ignored
+
+session_branch_protection_requires_aarch64 = `-Zbranch-protection` is only supported on aarch64
+
+session_split_debuginfo_unstable_platform = `-Csplit-debuginfo={$debuginfo}` is unstable on this platform
+
+session_file_is_not_writeable = output file {$file} is not writeable -- check its permissions
+
+session_crate_name_does_not_match = `--crate-name` and `#[crate_name]` are required to match, but `{$s}` != `{$name}`
+
+session_crate_name_invalid = crate names cannot start with a `-`, but `{$s}` has a leading hyphen
+
+session_crate_name_empty = crate name must not be empty
+
+session_invalid_character_in_create_name = invalid character `{$character}` in crate name: `{$crate_name}`
+
+session_expr_parentheses_needed = parentheses are required to parse this as an expression
+
+session_skipping_const_checks = skipping const checks
+session_unleashed_feature_help_named = skipping check for `{$gate}` feature
+session_unleashed_feature_help_unnamed = skipping check that does not even have a feature gate
+
+session_hexadecimal_float_literal_not_supported = hexadecimal float literal is not supported
+session_octal_float_literal_not_supported = octal float literal is not supported
+session_binary_float_literal_not_supported = binary float literal is not supported
+session_not_supported = not supported
+
+session_invalid_literal_suffix = suffixes on {$kind} literals are invalid
+    .label = invalid suffix `{$suffix}`
+
+session_invalid_num_literal_base_prefix = invalid base prefix for number literal
+    .note = base prefixes (`0xff`, `0b1010`, `0o755`) are lowercase
+    .suggestion = try making the prefix lowercase
+
+session_invalid_num_literal_suffix = invalid suffix `{$suffix}` for number literal
+    .label = invalid suffix `{$suffix}`
+    .help = the suffix must be one of the numeric types (`u32`, `isize`, `f32`, etc.)
+
+session_invalid_float_literal_width = invalid width `{$width}` for float literal
+    .help = valid widths are 32 and 64
+
+session_invalid_float_literal_suffix = invalid suffix `{$suffix}` for float literal
+    .label = invalid suffix `{$suffix}`
+    .help = valid suffixes are `f32` and `f64`
+
+session_int_literal_too_large = integer literal is too large
+    .note = value exceeds limit of `{$limit}`
+
+session_invalid_int_literal_width = invalid width `{$width}` for integer literal
+    .help = valid widths are 8, 16, 32, 64 and 128
+
+session_optimization_fuel_exhausted = optimization-fuel-exhausted: {$msg}
diff --git a/compiler/rustc_session/src/lib.rs b/compiler/rustc_session/src/lib.rs
index 39e871f532c..e1f1a5f6d2e 100644
--- a/compiler/rustc_session/src/lib.rs
+++ b/compiler/rustc_session/src/lib.rs
@@ -18,6 +18,9 @@ pub mod errors;
 #[macro_use]
 extern crate tracing;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
 pub mod cgu_reuse_tracker;
 pub mod utils;
 pub use lint::{declare_lint, declare_lint_pass, declare_tool_lint, impl_lint_pass};
@@ -39,6 +42,8 @@ pub mod output;
 
 pub use getopts;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 /// Requirements for a `StableHashingContext` to be used in this crate.
 /// This is a hack to allow using the `HashStable_Generic` derive macro
 /// instead of implementing everything in `rustc_middle`.
diff --git a/compiler/rustc_session/src/parse.rs b/compiler/rustc_session/src/parse.rs
index cbdcc5581e5..9d0ef9f2f12 100644
--- a/compiler/rustc_session/src/parse.rs
+++ b/compiler/rustc_session/src/parse.rs
@@ -226,8 +226,11 @@ pub struct ParseSess {
 
 impl ParseSess {
     /// Used for testing.
-    pub fn new(file_path_mapping: FilePathMapping) -> Self {
-        let fallback_bundle = fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+    pub fn new(
+        locale_resources: &'static [&'static str],
+        file_path_mapping: FilePathMapping,
+    ) -> Self {
+        let fallback_bundle = fallback_fluent_bundle(locale_resources, false);
         let sm = Lrc::new(SourceMap::new(file_path_mapping));
         let handler = Handler::with_tty_emitter(
             ColorConfig::Auto,
@@ -265,7 +268,7 @@ impl ParseSess {
     }
 
     pub fn with_silent_emitter(fatal_note: Option<String>) -> Self {
-        let fallback_bundle = fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+        let fallback_bundle = fallback_fluent_bundle(&[], false);
         let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         let fatal_handler =
             Handler::with_tty_emitter(ColorConfig::Auto, false, None, None, None, fallback_bundle);
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index 3dc09854b3c..0be057de6d7 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -1341,6 +1341,7 @@ pub fn build_session(
     io: CompilerIO,
     bundle: Option<Lrc<rustc_errors::FluentBundle>>,
     registry: rustc_errors::registry::Registry,
+    fluent_resources: &'static [&'static str],
     driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
     file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
     target_override: Option<Target>,
@@ -1385,7 +1386,7 @@ pub fn build_session(
     ));
 
     let fallback_bundle = fallback_fluent_bundle(
-        rustc_errors::DEFAULT_LOCALE_RESOURCES,
+        fluent_resources,
         sopts.unstable_opts.translate_directionality_markers,
     );
     let emitter = default_emitter(&sopts, registry, source_map.clone(), bundle, fallback_bundle);
@@ -1629,8 +1630,13 @@ pub enum IncrCompSession {
     InvalidBecauseOfErrors { session_directory: PathBuf },
 }
 
+// FIXME(#100717): early errors aren't translated at the moment, so this is fine, but it will need
+// to reference every crate that might emit an early error for translation to work.
+static EARLY_ERROR_LOCALE_RESOURCE: &'static [&'static str] =
+    &[rustc_errors::DEFAULT_LOCALE_RESOURCE];
+
 fn early_error_handler(output: config::ErrorOutputType) -> rustc_errors::Handler {
-    let fallback_bundle = fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+    let fallback_bundle = fallback_fluent_bundle(EARLY_ERROR_LOCALE_RESOURCE, false);
     let emitter: Box<dyn Emitter + sync::Send> = match output {
         config::ErrorOutputType::HumanReadable(kind) => {
             let (short, color_config) = kind.unzip();
diff --git a/compiler/rustc_symbol_mangling/locales/en-US.ftl b/compiler/rustc_symbol_mangling/locales/en-US.ftl
new file mode 100644
index 00000000000..b7d48280f46
--- /dev/null
+++ b/compiler/rustc_symbol_mangling/locales/en-US.ftl
@@ -0,0 +1 @@
+symbol_mangling_test_output = {$kind}({$content})
diff --git a/compiler/rustc_symbol_mangling/src/lib.rs b/compiler/rustc_symbol_mangling/src/lib.rs
index d81722e59a6..d9ce7373483 100644
--- a/compiler/rustc_symbol_mangling/src/lib.rs
+++ b/compiler/rustc_symbol_mangling/src/lib.rs
@@ -100,8 +100,10 @@ extern crate rustc_middle;
 #[macro_use]
 extern crate tracing;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
+use rustc_macros::fluent_messages;
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrs;
 use rustc_middle::mir::mono::{InstantiationMode, MonoItem};
@@ -117,6 +119,8 @@ pub mod errors;
 pub mod test;
 pub mod typeid;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 /// This function computes the symbol name for the given `instance` and the
 /// given instantiating crate. That is, if you know that instance X is
 /// instantiated in crate Y, this is the symbol name this instance would have.
diff --git a/compiler/rustc_trait_selection/locales/en-US.ftl b/compiler/rustc_trait_selection/locales/en-US.ftl
new file mode 100644
index 00000000000..14eb4a5502d
--- /dev/null
+++ b/compiler/rustc_trait_selection/locales/en-US.ftl
@@ -0,0 +1,22 @@
+trait_selection_dump_vtable_entries = vtable entries for `{$trait_ref}`: {$entries}
+
+trait_selection_unable_to_construct_constant_value = unable to construct a constant value for the unevaluated constant {$unevaluated}
+
+trait_selection_empty_on_clause_in_rustc_on_unimplemented = empty `on`-clause in `#[rustc_on_unimplemented]`
+    .label = empty on-clause here
+
+trait_selection_invalid_on_clause_in_rustc_on_unimplemented = invalid `on`-clause in `#[rustc_on_unimplemented]`
+    .label = invalid on-clause here
+
+trait_selection_no_value_in_rustc_on_unimplemented = this attribute must have a valid value
+    .label = expected value here
+    .note = eg `#[rustc_on_unimplemented(message="foo")]`
+
+trait_selection_negative_positive_conflict = found both positive and negative implementation of trait `{$trait_desc}`{$self_desc ->
+        [none] {""}
+       *[default] {" "}for type `{$self_desc}`
+    }:
+    .negative_implementation_here = negative implementation here
+    .negative_implementation_in_crate = negative implementation in crate `{$negative_impl_cname}`
+    .positive_implementation_here = positive implementation here
+    .positive_implementation_in_crate = positive implementation in crate `{$positive_impl_cname}`
diff --git a/compiler/rustc_trait_selection/src/errors.rs b/compiler/rustc_trait_selection/src/errors.rs
index 4405537c645..df7c4df1868 100644
--- a/compiler/rustc_trait_selection/src/errors.rs
+++ b/compiler/rustc_trait_selection/src/errors.rs
@@ -1,4 +1,5 @@
-use rustc_errors::{fluent, ErrorGuaranteed, Handler, IntoDiagnostic};
+use crate::fluent_generated as fluent;
+use rustc_errors::{ErrorGuaranteed, Handler, IntoDiagnostic};
 use rustc_macros::Diagnostic;
 use rustc_middle::ty::{self, PolyTraitRef, Ty};
 use rustc_span::{Span, Symbol};
@@ -69,19 +70,19 @@ impl IntoDiagnostic<'_> for NegativePositiveConflict<'_> {
         diag.code(rustc_errors::error_code!(E0751));
         match self.negative_impl_span {
             Ok(span) => {
-                diag.span_label(span, fluent::negative_implementation_here);
+                diag.span_label(span, fluent::trait_selection_negative_implementation_here);
             }
             Err(cname) => {
-                diag.note(fluent::negative_implementation_in_crate);
+                diag.note(fluent::trait_selection_negative_implementation_in_crate);
                 diag.set_arg("negative_impl_cname", cname.to_string());
             }
         }
         match self.positive_impl_span {
             Ok(span) => {
-                diag.span_label(span, fluent::positive_implementation_here);
+                diag.span_label(span, fluent::trait_selection_positive_implementation_here);
             }
             Err(cname) => {
-                diag.note(fluent::positive_implementation_in_crate);
+                diag.note(fluent::trait_selection_positive_implementation_in_crate);
                 diag.set_arg("positive_impl_cname", cname.to_string());
             }
         }
diff --git a/compiler/rustc_trait_selection/src/lib.rs b/compiler/rustc_trait_selection/src/lib.rs
index 6fa09410363..548b42cef43 100644
--- a/compiler/rustc_trait_selection/src/lib.rs
+++ b/compiler/rustc_trait_selection/src/lib.rs
@@ -36,7 +36,12 @@ extern crate rustc_middle;
 #[macro_use]
 extern crate smallvec;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
+
 pub mod errors;
 pub mod infer;
 pub mod solve;
 pub mod traits;
+
+fluent_messages! { "../locales/en-US.ftl" }
diff --git a/compiler/rustc_ty_utils/locales/en-US.ftl b/compiler/rustc_ty_utils/locales/en-US.ftl
new file mode 100644
index 00000000000..abe65a0e3fe
--- /dev/null
+++ b/compiler/rustc_ty_utils/locales/en-US.ftl
@@ -0,0 +1,47 @@
+ty_utils_needs_drop_overflow = overflow while checking whether `{$query_ty}` requires drop
+
+ty_utils_generic_constant_too_complex = overly complex generic constant
+    .help = consider moving this anonymous constant into a `const` function
+    .maybe_supported = this operation may be supported in the future
+
+ty_utils_borrow_not_supported = borrowing is not supported in generic constants
+
+ty_utils_address_and_deref_not_supported = dereferencing or taking the address is not supported in generic constants
+
+ty_utils_array_not_supported = array construction is not supported in generic constants
+
+ty_utils_block_not_supported = blocks are not supported in generic constants
+
+ty_utils_never_to_any_not_supported = converting nevers to any is not supported in generic constants
+
+ty_utils_tuple_not_supported = tuple construction is not supported in generic constants
+
+ty_utils_index_not_supported = indexing is not supported in generic constants
+
+ty_utils_field_not_supported = field access is not supported in generic constants
+
+ty_utils_const_block_not_supported = const blocks are not supported in generic constants
+
+ty_utils_adt_not_supported = struct/enum construction is not supported in generic constants
+
+ty_utils_pointer_not_supported = pointer casts are not allowed in generic constants
+
+ty_utils_yield_not_supported = generator control flow is not allowed in generic constants
+
+ty_utils_loop_not_supported = loops and loop control flow are not supported in generic constants
+
+ty_utils_box_not_supported = allocations are not allowed in generic constants
+
+ty_utils_binary_not_supported = unsupported binary operation in generic constants
+
+ty_utils_logical_op_not_supported = unsupported operation in generic constants, short-circuiting operations would imply control flow
+
+ty_utils_assign_not_supported = assignment is not supported in generic constants
+
+ty_utils_closure_and_return_not_supported = closures and function keywords are not supported in generic constants
+
+ty_utils_control_flow_not_supported = control flow is not supported in generic constants
+
+ty_utils_inline_asm_not_supported = assembly is not supported in generic constants
+
+ty_utils_operation_not_supported = unsupported operation in generic constants
diff --git a/compiler/rustc_ty_utils/src/errors.rs b/compiler/rustc_ty_utils/src/errors.rs
index c05eeb353a8..ab3e62f0484 100644
--- a/compiler/rustc_ty_utils/src/errors.rs
+++ b/compiler/rustc_ty_utils/src/errors.rs
@@ -16,7 +16,7 @@ pub struct NeedsDropOverflow<'tcx> {
 pub struct GenericConstantTooComplex {
     #[primary_span]
     pub span: Span,
-    #[note(maybe_supported)]
+    #[note(ty_utils_maybe_supported)]
     pub maybe_supported: Option<()>,
     #[subdiagnostic]
     pub sub: GenericConstantTooComplexSub,
diff --git a/compiler/rustc_ty_utils/src/lib.rs b/compiler/rustc_ty_utils/src/lib.rs
index 0853de601b0..35f468aa952 100644
--- a/compiler/rustc_ty_utils/src/lib.rs
+++ b/compiler/rustc_ty_utils/src/lib.rs
@@ -15,6 +15,8 @@ extern crate rustc_middle;
 #[macro_use]
 extern crate tracing;
 
+use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::fluent_messages;
 use rustc_middle::ty::query::Providers;
 
 mod abi;
@@ -31,6 +33,8 @@ pub mod representability;
 mod structural_match;
 mod ty;
 
+fluent_messages! { "../locales/en-US.ftl" }
+
 pub fn provide(providers: &mut Providers) {
     abi::provide(providers);
     assoc::provide(providers);
diff --git a/src/librustdoc/clean/render_macro_matchers.rs b/src/librustdoc/clean/render_macro_matchers.rs
index ed7683e36fd..068d596f52f 100644
--- a/src/librustdoc/clean/render_macro_matchers.rs
+++ b/src/librustdoc/clean/render_macro_matchers.rs
@@ -63,7 +63,7 @@ fn snippet_equal_to_token(tcx: TyCtxt<'_>, matcher: &TokenTree) -> Option<String
     let snippet = source_map.span_to_snippet(span).ok()?;
 
     // Create a Parser.
-    let sess = ParseSess::new(FilePathMapping::empty());
+    let sess = ParseSess::new(rustc_driver::DEFAULT_LOCALE_RESOURCES, FilePathMapping::empty());
     let file_name = source_map.span_to_filename(span);
     let mut parser =
         match rustc_parse::maybe_new_parser_from_source_str(&sess, file_name, snippet.clone()) {
diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
index 5ab7056be44..cb0feed08a0 100644
--- a/src/librustdoc/core.rs
+++ b/src/librustdoc/core.rs
@@ -116,7 +116,7 @@ pub(crate) fn new_handler(
     unstable_opts: &UnstableOptions,
 ) -> rustc_errors::Handler {
     let fallback_bundle =
-        rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+        rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
     let emitter: Box<dyn Emitter + sync::Send> = match error_format {
         ErrorOutputType::HumanReadable(kind) => {
             let (short, color_config) = kind.unzip();
@@ -254,6 +254,7 @@ pub(crate) fn create_config(
         output_file: None,
         output_dir: None,
         file_loader: None,
+        locale_resources: rustc_driver::DEFAULT_LOCALE_RESOURCES,
         lint_caps,
         parse_sess_created: None,
         register_lints: Some(Box::new(crate::lint::register_lints)),
diff --git a/src/librustdoc/doctest.rs b/src/librustdoc/doctest.rs
index 0eba81c7c1e..509240a5194 100644
--- a/src/librustdoc/doctest.rs
+++ b/src/librustdoc/doctest.rs
@@ -96,6 +96,7 @@ pub(crate) fn run(options: RustdocOptions) -> Result<(), ErrorGuaranteed> {
         output_file: None,
         output_dir: None,
         file_loader: None,
+        locale_resources: rustc_driver::DEFAULT_LOCALE_RESOURCES,
         lint_caps,
         parse_sess_created: None,
         register_lints: Some(Box::new(crate::lint::register_lints)),
@@ -546,7 +547,7 @@ pub(crate) fn make_test(
             // send all the errors that librustc_ast emits directly into a `Sink` instead of stderr.
             let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
             let fallback_bundle =
-                rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+                rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
             supports_color = EmitterWriter::stderr(
                 ColorConfig::Auto,
                 None,
@@ -742,7 +743,7 @@ fn check_if_attr_is_complete(source: &str, edition: Edition) -> bool {
             // send all the errors that librustc_ast emits directly into a `Sink` instead of stderr.
             let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
             let fallback_bundle =
-                rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+                rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
 
             let emitter = EmitterWriter::new(
                 Box::new(io::sink()),
diff --git a/src/librustdoc/passes/lint/check_code_block_syntax.rs b/src/librustdoc/passes/lint/check_code_block_syntax.rs
index 03be5e79971..71f922662da 100644
--- a/src/librustdoc/passes/lint/check_code_block_syntax.rs
+++ b/src/librustdoc/passes/lint/check_code_block_syntax.rs
@@ -34,7 +34,7 @@ fn check_rust_syntax(
 ) {
     let buffer = Lrc::new(Lock::new(Buffer::default()));
     let fallback_bundle =
-        rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+        rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
     let emitter = BufferEmitter { buffer: Lrc::clone(&buffer), fallback_bundle };
 
     let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
diff --git a/src/tools/clippy/clippy_lints/src/doc.rs b/src/tools/clippy/clippy_lints/src/doc.rs
index 0b31e20fc87..660dd8391a3 100644
--- a/src/tools/clippy/clippy_lints/src/doc.rs
+++ b/src/tools/clippy/clippy_lints/src/doc.rs
@@ -705,7 +705,7 @@ fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
 
                 let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
                 let fallback_bundle =
-                    rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+                    rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
                 let emitter = EmitterWriter::new(
                     Box::new(io::sink()),
                     None,
diff --git a/src/tools/clippy/src/driver.rs b/src/tools/clippy/src/driver.rs
index e45835efe74..45209fb8519 100644
--- a/src/tools/clippy/src/driver.rs
+++ b/src/tools/clippy/src/driver.rs
@@ -209,7 +209,7 @@ fn report_clippy_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
     // Separate the output with an empty line
     eprintln!();
 
-    let fallback_bundle = rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+    let fallback_bundle = rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
     let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
         rustc_errors::ColorConfig::Auto,
         None,
diff --git a/src/tools/rustfmt/src/parse/session.rs b/src/tools/rustfmt/src/parse/session.rs
index 9014026b0aa..a7a363d47ba 100644
--- a/src/tools/rustfmt/src/parse/session.rs
+++ b/src/tools/rustfmt/src/parse/session.rs
@@ -124,7 +124,7 @@ fn default_handler(
         silent_emitter()
     } else {
         let fallback_bundle =
-            rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+            rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
         Box::new(EmitterWriter::stderr(
             color_cfg,
             Some(source_map.clone()),
diff --git a/tests/run-make-fulldeps/issue-19371/foo.rs b/tests/run-make-fulldeps/issue-19371/foo.rs
index 5bb38fc02af..53ec79e477b 100644
--- a/tests/run-make-fulldeps/issue-19371/foo.rs
+++ b/tests/run-make-fulldeps/issue-19371/foo.rs
@@ -53,6 +53,7 @@ fn compile(code: String, output: PathBuf, sysroot: PathBuf) {
         output_file: Some(output),
         output_dir: None,
         file_loader: None,
+        locale_resources: &[],
         lint_caps: Default::default(),
         parse_sess_created: None,
         register_lints: None,
diff --git a/tests/ui-fulldeps/fluent-messages/duplicate.ftl b/tests/ui-fulldeps/fluent-messages/duplicate.ftl
new file mode 100644
index 00000000000..871550b231a
--- /dev/null
+++ b/tests/ui-fulldeps/fluent-messages/duplicate.ftl
@@ -0,0 +1,3 @@
+no_crate_a_b_key = Value
+
+no_crate_a_b_key = Another Value
diff --git a/tests/ui-fulldeps/fluent-messages/label-with-hyphens.ftl b/tests/ui-fulldeps/fluent-messages/label-with-hyphens.ftl
index 016cbeef662..3088b1f8dc8 100644
--- a/tests/ui-fulldeps/fluent-messages/label-with-hyphens.ftl
+++ b/tests/ui-fulldeps/fluent-messages/label-with-hyphens.ftl
@@ -1,2 +1,2 @@
-label_with_hyphens_some_slug = hi
+no_crate_some_slug = hi
     .label-has-hyphens = test
diff --git a/tests/ui-fulldeps/fluent-messages/missing-crate-name.ftl b/tests/ui-fulldeps/fluent-messages/missing-crate-name.ftl
index 9bd035c1bba..0a64e3894bd 100644
--- a/tests/ui-fulldeps/fluent-messages/missing-crate-name.ftl
+++ b/tests/ui-fulldeps/fluent-messages/missing-crate-name.ftl
@@ -1,2 +1,2 @@
 with-hyphens = 1234
-test-crate_foo = abcd
+no-crate_foo = abcd
diff --git a/tests/ui-fulldeps/fluent-messages/missing-message-ref.ftl b/tests/ui-fulldeps/fluent-messages/missing-message-ref.ftl
index 0cd8229b230..4c6514a9770 100644
--- a/tests/ui-fulldeps/fluent-messages/missing-message-ref.ftl
+++ b/tests/ui-fulldeps/fluent-messages/missing-message-ref.ftl
@@ -1 +1 @@
-missing_message_ref = {message}
+no_crate_missing_message_ref = {message}
diff --git a/tests/ui-fulldeps/fluent-messages/missing-message.ftl b/tests/ui-fulldeps/fluent-messages/missing-message.ftl
index 74b2aa1d44d..61f56fd4d57 100644
--- a/tests/ui-fulldeps/fluent-messages/missing-message.ftl
+++ b/tests/ui-fulldeps/fluent-messages/missing-message.ftl
@@ -1 +1 @@
-missing_message =
+no_crate_missing_message =
diff --git a/tests/ui-fulldeps/fluent-messages/slug-with-hyphens.ftl b/tests/ui-fulldeps/fluent-messages/slug-with-hyphens.ftl
index 86ba9a268f3..a64c85094f1 100644
--- a/tests/ui-fulldeps/fluent-messages/slug-with-hyphens.ftl
+++ b/tests/ui-fulldeps/fluent-messages/slug-with-hyphens.ftl
@@ -1 +1 @@
-slug_with_hyphens_this-slug-has-hyphens = hi
+no_crate_this-slug-has-hyphens = hi
diff --git a/tests/ui-fulldeps/fluent-messages/test.rs b/tests/ui-fulldeps/fluent-messages/test.rs
index 74303e97dba..66575eb8e30 100644
--- a/tests/ui-fulldeps/fluent-messages/test.rs
+++ b/tests/ui-fulldeps/fluent-messages/test.rs
@@ -21,87 +21,74 @@ pub enum SubdiagnosticMessage {
 mod missing_absolute {
     use super::fluent_messages;
 
-    fluent_messages! {
-        missing_absolute => "/definitely_does_not_exist.ftl",
-//~^ ERROR could not open Fluent resource
-    }
+    fluent_messages! { "/definitely_does_not_exist.ftl" }
+    //~^ ERROR could not open Fluent resource
 }
 
 mod missing_relative {
     use super::fluent_messages;
 
-    fluent_messages! {
-        missing_relative => "../definitely_does_not_exist.ftl",
-//~^ ERROR could not open Fluent resource
-    }
+    fluent_messages! { "../definitely_does_not_exist.ftl" }
+    //~^ ERROR could not open Fluent resource
 }
 
 mod missing_message {
     use super::fluent_messages;
 
-    fluent_messages! {
-        missing_message => "./missing-message.ftl",
-//~^ ERROR could not parse Fluent resource
-    }
+    fluent_messages! { "./missing-message.ftl" }
+    //~^ ERROR could not parse Fluent resource
 }
 
 mod duplicate {
     use super::fluent_messages;
 
-    fluent_messages! {
-//~^ ERROR the name `a_b_key` is defined multiple times
-        a => "./duplicate-a.ftl",
-        a_b => "./duplicate-a-b.ftl",
-//~^ ERROR overrides existing message: `a_b_key`
-    }
+    fluent_messages! { "./duplicate.ftl" }
+    //~^ ERROR overrides existing message: `no_crate_a_b_key`
 }
 
 mod slug_with_hyphens {
     use super::fluent_messages;
 
-    fluent_messages! {
-        slug_with_hyphens => "./slug-with-hyphens.ftl",
-//~^ ERROR name `slug_with_hyphens_this-slug-has-hyphens` contains a '-' character
-    }
+    fluent_messages! { "./slug-with-hyphens.ftl" }
+    //~^ ERROR name `no_crate_this-slug-has-hyphens` contains a '-' character
 }
 
 mod label_with_hyphens {
     use super::fluent_messages;
 
-    fluent_messages! {
-        label_with_hyphens => "./label-with-hyphens.ftl",
-//~^ ERROR attribute `label-has-hyphens` contains a '-' character
-    }
+    fluent_messages! { "./label-with-hyphens.ftl" }
+    //~^ ERROR attribute `label-has-hyphens` contains a '-' character
 }
 
 mod valid {
     use super::fluent_messages;
 
-    fluent_messages! {
-        valid => "./valid.ftl",
-    }
+    fluent_messages! { "./valid.ftl" }
 
-    use self::fluent_generated::{DEFAULT_LOCALE_RESOURCES, valid_key};
+    mod test_generated {
+        use super::{fluent_generated::no_crate_key, DEFAULT_LOCALE_RESOURCE};
+    }
 }
 
 mod missing_crate_name {
     use super::fluent_messages;
 
-    fluent_messages! {
-        test_crate => "./missing-crate-name.ftl",
-//~^ ERROR name `test-crate_foo` contains a '-' character
-//~| ERROR name `with-hyphens` contains a '-' character
-//~| ERROR name `with-hyphens` does not start with the crate name
-    }
+    fluent_messages! { "./missing-crate-name.ftl" }
+    //~^ ERROR name `no-crate_foo` contains a '-' character
+    //~| ERROR name `with-hyphens` contains a '-' character
+    //~| ERROR name `with-hyphens` does not start with the crate name
 
-    use self::fluent_generated::{DEFAULT_LOCALE_RESOURCES, test_crate_foo, with_hyphens};
+    mod test_generated {
+        use super::{
+            fluent_generated::{no_crate_foo, with_hyphens},
+            DEFAULT_LOCALE_RESOURCE,
+        };
+    }
 }
 
 mod missing_message_ref {
     use super::fluent_messages;
 
-    fluent_messages! {
-        missing => "./missing-message-ref.ftl"
-//~^ ERROR referenced message `message` does not exist
-    }
+    fluent_messages! { "./missing-message-ref.ftl" }
+    //~^ ERROR referenced message `message` does not exist
 }
diff --git a/tests/ui-fulldeps/fluent-messages/test.stderr b/tests/ui-fulldeps/fluent-messages/test.stderr
index 2631b0a6232..c7961ed22f2 100644
--- a/tests/ui-fulldeps/fluent-messages/test.stderr
+++ b/tests/ui-fulldeps/fluent-messages/test.stderr
@@ -1,106 +1,87 @@
 error: could not open Fluent resource
-  --> $DIR/test.rs:25:29
+  --> $DIR/test.rs:24:24
    |
-LL |         missing_absolute => "/definitely_does_not_exist.ftl",
-   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     fluent_messages! { "/definitely_does_not_exist.ftl" }
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: os-specific message
 
 error: could not open Fluent resource
-  --> $DIR/test.rs:34:29
+  --> $DIR/test.rs:31:24
    |
-LL |         missing_relative => "../definitely_does_not_exist.ftl",
-   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     fluent_messages! { "../definitely_does_not_exist.ftl" }
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: os-specific message
 
 error: could not parse Fluent resource
-  --> $DIR/test.rs:43:28
+  --> $DIR/test.rs:38:24
    |
-LL |         missing_message => "./missing-message.ftl",
-   |                            ^^^^^^^^^^^^^^^^^^^^^^^
+LL |     fluent_messages! { "./missing-message.ftl" }
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: see additional errors emitted
 
-error: expected a message field for "missing_message"
+error: expected a message field for "no_crate_missing_message"
  --> ./missing-message.ftl:1:1
   |
-1 | missing_message =
-  | ^^^^^^^^^^^^^^^^^
+1 | no_crate_missing_message =
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
 
-error: overrides existing message: `a_b_key`
-  --> $DIR/test.rs:54:16
+error: overrides existing message: `no_crate_a_b_key`
+  --> $DIR/test.rs:45:24
    |
-LL |         a_b => "./duplicate-a-b.ftl",
-   |                ^^^^^^^^^^^^^^^^^^^^^
-   |
-help: previously defined in this resource
-  --> $DIR/test.rs:53:14
-   |
-LL |         a => "./duplicate-a.ftl",
-   |              ^^^^^^^^^^^^^^^^^^^
-
-error[E0428]: the name `a_b_key` is defined multiple times
-  --> $DIR/test.rs:51:5
-   |
-LL |     fluent_messages! {
-   |     ^^^^^^^^^^^^^^^^
-   |     |
-   |     `a_b_key` redefined here
-   |     previous definition of the value `a_b_key` here
-   |
-   = note: os-specific message
-   = note: os-specific message
+LL |     fluent_messages! { "./duplicate.ftl" }
+   |                        ^^^^^^^^^^^^^^^^^
 
-error: name `slug_with_hyphens_this-slug-has-hyphens` contains a '-' character
-  --> $DIR/test.rs:63:30
+error: name `no_crate_this-slug-has-hyphens` contains a '-' character
+  --> $DIR/test.rs:52:24
    |
-LL |         slug_with_hyphens => "./slug-with-hyphens.ftl",
-   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     fluent_messages! { "./slug-with-hyphens.ftl" }
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: replace any '-'s with '_'s
 
 error: attribute `label-has-hyphens` contains a '-' character
-  --> $DIR/test.rs:72:31
+  --> $DIR/test.rs:59:24
    |
-LL |         label_with_hyphens => "./label-with-hyphens.ftl",
-   |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     fluent_messages! { "./label-with-hyphens.ftl" }
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: replace any '-'s with '_'s
 
 error: name `with-hyphens` contains a '-' character
-  --> $DIR/test.rs:91:23
+  --> $DIR/test.rs:76:24
    |
-LL |         test_crate => "./missing-crate-name.ftl",
-   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     fluent_messages! { "./missing-crate-name.ftl" }
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: replace any '-'s with '_'s
 
 error: name `with-hyphens` does not start with the crate name
-  --> $DIR/test.rs:91:23
+  --> $DIR/test.rs:76:24
    |
-LL |         test_crate => "./missing-crate-name.ftl",
-   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     fluent_messages! { "./missing-crate-name.ftl" }
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: prepend `test_crate_` to the slug name: `test_crate_with_hyphens`
+   = help: prepend `no_crate_` to the slug name: `no_crate_with_hyphens`
 
-error: name `test-crate_foo` contains a '-' character
-  --> $DIR/test.rs:91:23
+error: name `no-crate_foo` contains a '-' character
+  --> $DIR/test.rs:76:24
    |
-LL |         test_crate => "./missing-crate-name.ftl",
-   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     fluent_messages! { "./missing-crate-name.ftl" }
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: replace any '-'s with '_'s
 
-error: referenced message `message` does not exist (in message `missing_message_ref`)
-  --> $DIR/test.rs:104:20
+error: referenced message `message` does not exist (in message `no_crate_missing_message_ref`)
+  --> $DIR/test.rs:92:24
    |
-LL |         missing => "./missing-message-ref.ftl"
-   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     fluent_messages! { "./missing-message-ref.ftl" }
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: you may have meant to use a variable reference (`{$message}`)
 
-error: aborting due to 11 previous errors
+error: aborting due to 10 previous errors
 
-For more information about this error, try `rustc --explain E0428`.
diff --git a/tests/ui-fulldeps/fluent-messages/valid.ftl b/tests/ui-fulldeps/fluent-messages/valid.ftl
index 54927430600..598473adb68 100644
--- a/tests/ui-fulldeps/fluent-messages/valid.ftl
+++ b/tests/ui-fulldeps/fluent-messages/valid.ftl
@@ -1 +1 @@
-valid_key = Valid!
+no_crate_key = Valid!
diff --git a/tests/ui-fulldeps/internal-lints/diagnostics.ftl b/tests/ui-fulldeps/internal-lints/diagnostics.ftl
new file mode 100644
index 00000000000..cb2d476d815
--- /dev/null
+++ b/tests/ui-fulldeps/internal-lints/diagnostics.ftl
@@ -0,0 +1,5 @@
+no_crate_example = this is an example message used in testing
+    .note = with a note
+    .help = with a help
+    .suggestion = with a suggestion
+    .label = with a label
diff --git a/tests/ui-fulldeps/internal-lints/diagnostics.rs b/tests/ui-fulldeps/internal-lints/diagnostics.rs
index 643e81d99c6..3aa65d53d4e 100644
--- a/tests/ui-fulldeps/internal-lints/diagnostics.rs
+++ b/tests/ui-fulldeps/internal-lints/diagnostics.rs
@@ -13,20 +13,22 @@ extern crate rustc_span;
 
 use rustc_errors::{
     AddToDiagnostic, IntoDiagnostic, Diagnostic, DiagnosticBuilder,
-    ErrorGuaranteed, Handler, fluent, SubdiagnosticMessage,
+    ErrorGuaranteed, Handler, DiagnosticMessage, SubdiagnosticMessage,
 };
-use rustc_macros::{Diagnostic, Subdiagnostic};
+use rustc_macros::{fluent_messages, Diagnostic, Subdiagnostic};
 use rustc_span::Span;
 
+fluent_messages! { "./diagnostics.ftl" }
+
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct DeriveDiagnostic {
     #[primary_span]
     span: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[note(compiletest_example)]
+#[note(no_crate_example)]
 struct Note {
     #[primary_span]
     span: Span,
@@ -45,7 +47,7 @@ pub struct TranslatableInIntoDiagnostic;
 
 impl<'a> IntoDiagnostic<'a, ErrorGuaranteed> for TranslatableInIntoDiagnostic {
     fn into_diagnostic(self, handler: &'a Handler) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
-        handler.struct_err(fluent::compiletest_example)
+        handler.struct_err(crate::fluent_generated::no_crate_example)
     }
 }
 
@@ -68,12 +70,12 @@ impl AddToDiagnostic for TranslatableInAddToDiagnostic {
     where
         F: Fn(&mut Diagnostic, SubdiagnosticMessage) -> SubdiagnosticMessage,
     {
-        diag.note(fluent::note);
+        diag.note(crate::fluent_generated::no_crate_note);
     }
 }
 
 pub fn make_diagnostics<'a>(handler: &'a Handler) {
-    let _diag = handler.struct_err(fluent::compiletest_example);
+    let _diag = handler.struct_err(crate::fluent_generated::no_crate_example);
     //~^ ERROR diagnostics should only be created in `IntoDiagnostic`/`AddToDiagnostic` impls
 
     let _diag = handler.struct_err("untranslatable diagnostic");
diff --git a/tests/ui-fulldeps/internal-lints/diagnostics.stderr b/tests/ui-fulldeps/internal-lints/diagnostics.stderr
index 510d6a17108..6f797ebc2dd 100644
--- a/tests/ui-fulldeps/internal-lints/diagnostics.stderr
+++ b/tests/ui-fulldeps/internal-lints/diagnostics.stderr
@@ -1,5 +1,5 @@
 error: diagnostics should be created using translatable messages
-  --> $DIR/diagnostics.rs:39:17
+  --> $DIR/diagnostics.rs:41:17
    |
 LL |         handler.struct_err("untranslatable diagnostic")
    |                 ^^^^^^^^^^
@@ -11,15 +11,15 @@ LL | #![deny(rustc::untranslatable_diagnostic)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: diagnostics should be created using translatable messages
-  --> $DIR/diagnostics.rs:59:14
+  --> $DIR/diagnostics.rs:61:14
    |
 LL |         diag.note("untranslatable diagnostic");
    |              ^^^^
 
 error: diagnostics should only be created in `IntoDiagnostic`/`AddToDiagnostic` impls
-  --> $DIR/diagnostics.rs:76:25
+  --> $DIR/diagnostics.rs:78:25
    |
-LL |     let _diag = handler.struct_err(fluent::compiletest_example);
+LL |     let _diag = handler.struct_err(crate::fluent_generated::no_crate_example);
    |                         ^^^^^^^^^^
    |
 note: the lint level is defined here
@@ -29,13 +29,13 @@ LL | #![deny(rustc::diagnostic_outside_of_impl)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: diagnostics should only be created in `IntoDiagnostic`/`AddToDiagnostic` impls
-  --> $DIR/diagnostics.rs:79:25
+  --> $DIR/diagnostics.rs:81:25
    |
 LL |     let _diag = handler.struct_err("untranslatable diagnostic");
    |                         ^^^^^^^^^^
 
 error: diagnostics should be created using translatable messages
-  --> $DIR/diagnostics.rs:79:25
+  --> $DIR/diagnostics.rs:81:25
    |
 LL |     let _diag = handler.struct_err("untranslatable diagnostic");
    |                         ^^^^^^^^^^
diff --git a/tests/ui-fulldeps/mod_dir_path_canonicalized.rs b/tests/ui-fulldeps/mod_dir_path_canonicalized.rs
index bdfd9628c48..f9d6fc8bae1 100644
--- a/tests/ui-fulldeps/mod_dir_path_canonicalized.rs
+++ b/tests/ui-fulldeps/mod_dir_path_canonicalized.rs
@@ -30,8 +30,10 @@ pub fn main() {
     assert_eq!(gravy::foo(), 10);
 }
 
+static TEST_LOCALE_RESOURCES: &[&str] = &[rustc_parse::DEFAULT_LOCALE_RESOURCE];
+
 fn parse() {
-    let parse_session = ParseSess::new(FilePathMapping::empty());
+    let parse_session = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
 
     let path = Path::new(file!());
     let path = path.canonicalize().unwrap();
diff --git a/tests/ui-fulldeps/pprust-expr-roundtrip.rs b/tests/ui-fulldeps/pprust-expr-roundtrip.rs
index a4fad9d3e1e..5c8aa865163 100644
--- a/tests/ui-fulldeps/pprust-expr-roundtrip.rs
+++ b/tests/ui-fulldeps/pprust-expr-roundtrip.rs
@@ -219,8 +219,10 @@ fn main() {
     rustc_span::create_default_session_globals_then(|| run());
 }
 
+static TEST_LOCALE_RESOURCES: &[&str] = &[rustc_parse::DEFAULT_LOCALE_RESOURCE];
+
 fn run() {
-    let ps = ParseSess::new(FilePathMapping::empty());
+    let ps = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
 
     iter_exprs(2, &mut |mut e| {
         // If the pretty printer is correct, then `parse(print(e))` should be identical to `e`,
diff --git a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.rs b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.rs
index 07f95d13937..01e6434b075 100644
--- a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.rs
+++ b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.rs
@@ -17,26 +17,28 @@ use rustc_span::symbol::Ident;
 use rustc_span::Span;
 
 extern crate rustc_macros;
-use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
+use rustc_macros::{fluent_messages, Diagnostic, LintDiagnostic, Subdiagnostic};
 
 extern crate rustc_middle;
 use rustc_middle::ty::Ty;
 
 extern crate rustc_errors;
-use rustc_errors::{Applicability, MultiSpan};
+use rustc_errors::{Applicability, DiagnosticMessage, MultiSpan, SubdiagnosticMessage};
 
 extern crate rustc_session;
 
+fluent_messages! { "./example.ftl" }
+
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct Hello {}
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct HelloWarn {}
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 //~^ ERROR unsupported type attribute for diagnostic derive enum
 enum DiagnosticOnEnum {
     Foo,
@@ -46,13 +48,13 @@ enum DiagnosticOnEnum {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 #[diag = "E0123"]
 //~^ ERROR `#[diag = ...]` is not a valid attribute
 struct WrongStructAttrStyle {}
 
 #[derive(Diagnostic)]
-#[nonsense(compiletest_example, code = "E0123")]
+#[nonsense(no_crate_example, code = "E0123")]
 //~^ ERROR `#[nonsense(...)]` is not a valid attribute
 //~^^ ERROR diagnostic slug not specified
 //~^^^ ERROR cannot find attribute `nonsense` in this scope
@@ -66,7 +68,7 @@ struct InvalidLitNestedAttr {}
 
 #[derive(Diagnostic)]
 #[diag(nonsense, code = "E0123")]
-//~^ ERROR cannot find value `nonsense` in module `rustc_errors::fluent`
+//~^ ERROR cannot find value `nonsense` in module `crate::fluent_generated`
 struct InvalidNestedStructAttr {}
 
 #[derive(Diagnostic)]
@@ -90,12 +92,12 @@ struct InvalidNestedStructAttr2 {}
 struct InvalidNestedStructAttr3 {}
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123", slug = "foo")]
+#[diag(no_crate_example, code = "E0123", slug = "foo")]
 //~^ ERROR `#[diag(slug = ...)]` is not a valid attribute
 struct InvalidNestedStructAttr4 {}
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct WrongPlaceField {
     #[suggestion = "bar"]
     //~^ ERROR `#[suggestion = ...]` is not a valid attribute
@@ -103,20 +105,20 @@ struct WrongPlaceField {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
-#[diag(compiletest_example, code = "E0456")]
+#[diag(no_crate_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0456")]
 //~^ ERROR specified multiple times
 //~^^ ERROR specified multiple times
 struct DiagSpecifiedTwice {}
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0456", code = "E0457")]
+#[diag(no_crate_example, code = "E0456", code = "E0457")]
 //~^ ERROR specified multiple times
 struct CodeSpecifiedTwice {}
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, compiletest_example, code = "E0456")]
-//~^ ERROR `#[diag(compiletest_example)]` is not a valid attribute
+#[diag(no_crate_example, no_crate::example, code = "E0456")]
+//~^ ERROR `#[diag(no_crate::example)]` is not a valid attribute
 struct SlugSpecifiedTwice {}
 
 #[derive(Diagnostic)]
@@ -128,11 +130,11 @@ struct KindNotProvided {} //~ ERROR diagnostic slug not specified
 struct SlugNotProvided {}
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct CodeNotProvided {}
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct MessageWrongType {
     #[primary_span]
     //~^ ERROR `#[primary_span]` attribute can only be applied to fields of type `Span` or `MultiSpan`
@@ -140,7 +142,7 @@ struct MessageWrongType {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct InvalidPathFieldAttr {
     #[nonsense]
     //~^ ERROR `#[nonsense]` is not a valid attribute
@@ -149,34 +151,34 @@ struct InvalidPathFieldAttr {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithField {
     name: String,
-    #[label(label)]
+    #[label(no_crate_label)]
     span: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithMessageAppliedToField {
-    #[label(label)]
+    #[label(no_crate_label)]
     //~^ ERROR the `#[label(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan`
     name: String,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithNonexistentField {
-    #[suggestion(suggestion, code = "{name}")]
+    #[suggestion(no_crate_suggestion, code = "{name}")]
     //~^ ERROR `name` doesn't refer to a field on this type
     suggestion: (Span, Applicability),
 }
 
 #[derive(Diagnostic)]
 //~^ ERROR invalid format string: expected `'}'`
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorMissingClosingBrace {
-    #[suggestion(suggestion, code = "{name")]
+    #[suggestion(no_crate_suggestion, code = "{name")]
     suggestion: (Span, Applicability),
     name: String,
     val: usize,
@@ -184,50 +186,50 @@ struct ErrorMissingClosingBrace {
 
 #[derive(Diagnostic)]
 //~^ ERROR invalid format string: unmatched `}`
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorMissingOpeningBrace {
-    #[suggestion(suggestion, code = "name}")]
+    #[suggestion(no_crate_suggestion, code = "name}")]
     suggestion: (Span, Applicability),
     name: String,
     val: usize,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct LabelOnSpan {
-    #[label(label)]
+    #[label(no_crate_label)]
     sp: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct LabelOnNonSpan {
-    #[label(label)]
+    #[label(no_crate_label)]
     //~^ ERROR the `#[label(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan`
     id: u32,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct Suggest {
-    #[suggestion(suggestion, code = "This is the suggested code")]
-    #[suggestion(suggestion, code = "This is the suggested code", style = "normal")]
-    #[suggestion(suggestion, code = "This is the suggested code", style = "short")]
-    #[suggestion(suggestion, code = "This is the suggested code", style = "hidden")]
-    #[suggestion(suggestion, code = "This is the suggested code", style = "verbose")]
+    #[suggestion(no_crate_suggestion, code = "This is the suggested code")]
+    #[suggestion(no_crate_suggestion, code = "This is the suggested code", style = "normal")]
+    #[suggestion(no_crate_suggestion, code = "This is the suggested code", style = "short")]
+    #[suggestion(no_crate_suggestion, code = "This is the suggested code", style = "hidden")]
+    #[suggestion(no_crate_suggestion, code = "This is the suggested code", style = "verbose")]
     suggestion: (Span, Applicability),
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct SuggestWithoutCode {
-    #[suggestion(suggestion)]
+    #[suggestion(no_crate_suggestion)]
     //~^ ERROR suggestion without `code = "..."`
     suggestion: (Span, Applicability),
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct SuggestWithBadKey {
     #[suggestion(nonsense = "bar")]
     //~^ ERROR `#[suggestion(nonsense = ...)]` is not a valid attribute
@@ -236,7 +238,7 @@ struct SuggestWithBadKey {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct SuggestWithShorthandMsg {
     #[suggestion(msg = "bar")]
     //~^ ERROR `#[suggestion(msg = ...)]` is not a valid attribute
@@ -245,52 +247,52 @@ struct SuggestWithShorthandMsg {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct SuggestWithoutMsg {
     #[suggestion(code = "bar")]
     suggestion: (Span, Applicability),
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct SuggestWithTypesSwapped {
-    #[suggestion(suggestion, code = "This is suggested code")]
+    #[suggestion(no_crate_suggestion, code = "This is suggested code")]
     suggestion: (Applicability, Span),
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct SuggestWithWrongTypeApplicabilityOnly {
-    #[suggestion(suggestion, code = "This is suggested code")]
+    #[suggestion(no_crate_suggestion, code = "This is suggested code")]
     //~^ ERROR wrong field type for suggestion
     suggestion: Applicability,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct SuggestWithSpanOnly {
-    #[suggestion(suggestion, code = "This is suggested code")]
+    #[suggestion(no_crate_suggestion, code = "This is suggested code")]
     suggestion: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct SuggestWithDuplicateSpanAndApplicability {
-    #[suggestion(suggestion, code = "This is suggested code")]
+    #[suggestion(no_crate_suggestion, code = "This is suggested code")]
     suggestion: (Span, Span, Applicability),
     //~^ ERROR specified multiple times
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct SuggestWithDuplicateApplicabilityAndSpan {
-    #[suggestion(suggestion, code = "This is suggested code")]
+    #[suggestion(no_crate_suggestion, code = "This is suggested code")]
     suggestion: (Applicability, Applicability, Span),
     //~^ ERROR specified multiple times
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct WrongKindOfAnnotation {
     #[label = "bar"]
     //~^ ERROR `#[label = ...]` is not a valid attribute
@@ -298,38 +300,38 @@ struct WrongKindOfAnnotation {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct OptionsInErrors {
-    #[label(label)]
+    #[label(no_crate_label)]
     label: Option<Span>,
-    #[suggestion(suggestion, code = "...")]
+    #[suggestion(no_crate_suggestion, code = "...")]
     opt_sugg: Option<(Span, Applicability)>,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0456")]
+#[diag(no_crate_example, code = "E0456")]
 struct MoveOutOfBorrowError<'tcx> {
     name: Ident,
     ty: Ty<'tcx>,
     #[primary_span]
-    #[label(label)]
+    #[label(no_crate_label)]
     span: Span,
-    #[label(label)]
+    #[label(no_crate_label)]
     other_span: Span,
-    #[suggestion(suggestion, code = "{name}.clone()")]
+    #[suggestion(no_crate_suggestion, code = "{name}.clone()")]
     opt_sugg: Option<(Span, Applicability)>,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithLifetime<'a> {
-    #[label(label)]
+    #[label(no_crate_label)]
     span: Span,
     name: &'a str,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithDefaultLabelAttr<'a> {
     #[label]
     span: Span,
@@ -338,7 +340,7 @@ struct ErrorWithDefaultLabelAttr<'a> {
 
 #[derive(Diagnostic)]
 //~^ ERROR the trait bound `Hello: IntoDiagnosticArg` is not satisfied
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ArgFieldWithoutSkip {
     #[primary_span]
     span: Span,
@@ -346,7 +348,7 @@ struct ArgFieldWithoutSkip {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ArgFieldWithSkip {
     #[primary_span]
     span: Span,
@@ -357,132 +359,132 @@ struct ArgFieldWithSkip {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithSpannedNote {
     #[note]
     span: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithSpannedNoteCustom {
-    #[note(note)]
+    #[note(no_crate_note)]
     span: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 #[note]
 struct ErrorWithNote {
     val: String,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
-#[note(note)]
+#[diag(no_crate_example, code = "E0123")]
+#[note(no_crate_note)]
 struct ErrorWithNoteCustom {
     val: String,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithSpannedHelp {
     #[help]
     span: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithSpannedHelpCustom {
-    #[help(help)]
+    #[help(no_crate_help)]
     span: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 #[help]
 struct ErrorWithHelp {
     val: String,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
-#[help(help)]
+#[diag(no_crate_example, code = "E0123")]
+#[help(no_crate_help)]
 struct ErrorWithHelpCustom {
     val: String,
 }
 
 #[derive(Diagnostic)]
 #[help]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithHelpWrongOrder {
     val: String,
 }
 
 #[derive(Diagnostic)]
-#[help(help)]
-#[diag(compiletest_example, code = "E0123")]
+#[help(no_crate_help)]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithHelpCustomWrongOrder {
     val: String,
 }
 
 #[derive(Diagnostic)]
 #[note]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithNoteWrongOrder {
     val: String,
 }
 
 #[derive(Diagnostic)]
-#[note(note)]
-#[diag(compiletest_example, code = "E0123")]
+#[note(no_crate_note)]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithNoteCustomWrongOrder {
     val: String,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ApplicabilityInBoth {
-    #[suggestion(suggestion, code = "...", applicability = "maybe-incorrect")]
+    #[suggestion(no_crate_suggestion, code = "...", applicability = "maybe-incorrect")]
     //~^ ERROR specified multiple times
     suggestion: (Span, Applicability),
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct InvalidApplicability {
-    #[suggestion(suggestion, code = "...", applicability = "batman")]
+    #[suggestion(no_crate_suggestion, code = "...", applicability = "batman")]
     //~^ ERROR invalid applicability
     suggestion: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ValidApplicability {
-    #[suggestion(suggestion, code = "...", applicability = "maybe-incorrect")]
+    #[suggestion(no_crate_suggestion, code = "...", applicability = "maybe-incorrect")]
     suggestion: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct NoApplicability {
-    #[suggestion(suggestion, code = "...")]
+    #[suggestion(no_crate_suggestion, code = "...")]
     suggestion: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[note(parse_add_paren)]
+#[note(no_crate_example)]
 struct Note;
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct Subdiagnostic {
     #[subdiagnostic]
     note: Note,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct VecField {
     #[primary_span]
     #[label]
@@ -490,57 +492,57 @@ struct VecField {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct UnitField {
     #[primary_span]
     spans: Span,
     #[help]
     foo: (),
-    #[help(help)]
+    #[help(no_crate_help)]
     bar: (),
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct OptUnitField {
     #[primary_span]
     spans: Span,
     #[help]
     foo: Option<()>,
-    #[help(help)]
+    #[help(no_crate_help)]
     bar: Option<()>,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct LabelWithTrailingPath {
-    #[label(label, foo)]
+    #[label(no_crate_label, foo)]
     //~^ ERROR `#[label(foo)]` is not a valid attribute
     span: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct LabelWithTrailingNameValue {
-    #[label(label, foo = "...")]
+    #[label(no_crate_label, foo = "...")]
     //~^ ERROR `#[label(foo = ...)]` is not a valid attribute
     span: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct LabelWithTrailingList {
-    #[label(label, foo("..."))]
+    #[label(no_crate_label, foo("..."))]
     //~^ ERROR `#[label(foo(...))]` is not a valid attribute
     span: Span,
 }
 
 #[derive(LintDiagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct LintsGood {}
 
 #[derive(LintDiagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct PrimarySpanOnLint {
     #[primary_span]
     //~^ ERROR `#[primary_span]` is not a valid attribute
@@ -548,42 +550,42 @@ struct PrimarySpanOnLint {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct ErrorWithMultiSpan {
     #[primary_span]
     span: MultiSpan,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 #[warning]
 struct ErrorWithWarn {
     val: String,
 }
 
 #[derive(Diagnostic)]
-#[error(compiletest_example, code = "E0123")]
+#[error(no_crate_example, code = "E0123")]
 //~^ ERROR `#[error(...)]` is not a valid attribute
 //~| ERROR diagnostic slug not specified
 //~| ERROR cannot find attribute `error` in this scope
 struct ErrorAttribute {}
 
 #[derive(Diagnostic)]
-#[warn_(compiletest_example, code = "E0123")]
+#[warn_(no_crate_example, code = "E0123")]
 //~^ ERROR `#[warn_(...)]` is not a valid attribute
 //~| ERROR diagnostic slug not specified
 //~| ERROR cannot find attribute `warn_` in this scope
 struct WarnAttribute {}
 
 #[derive(Diagnostic)]
-#[lint(compiletest_example, code = "E0123")]
+#[lint(no_crate_example, code = "E0123")]
 //~^ ERROR `#[lint(...)]` is not a valid attribute
 //~| ERROR diagnostic slug not specified
 //~| ERROR cannot find attribute `lint` in this scope
 struct LintAttributeOnSessionDiag {}
 
 #[derive(LintDiagnostic)]
-#[lint(compiletest_example, code = "E0123")]
+#[lint(no_crate_example, code = "E0123")]
 //~^ ERROR `#[lint(...)]` is not a valid attribute
 //~| ERROR `#[lint(...)]` is not a valid attribute
 //~| ERROR diagnostic slug not specified
@@ -591,55 +593,55 @@ struct LintAttributeOnSessionDiag {}
 struct LintAttributeOnLintDiag {}
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct DuplicatedSuggestionCode {
-    #[suggestion(suggestion, code = "...", code = ",,,")]
+    #[suggestion(no_crate_suggestion, code = "...", code = ",,,")]
     //~^ ERROR specified multiple times
     suggestion: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct InvalidTypeInSuggestionTuple {
-    #[suggestion(suggestion, code = "...")]
+    #[suggestion(no_crate_suggestion, code = "...")]
     suggestion: (Span, usize),
     //~^ ERROR wrong types for suggestion
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct MissingApplicabilityInSuggestionTuple {
-    #[suggestion(suggestion, code = "...")]
+    #[suggestion(no_crate_suggestion, code = "...")]
     suggestion: (Span,),
     //~^ ERROR wrong types for suggestion
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct MissingCodeInSuggestion {
-    #[suggestion(suggestion)]
+    #[suggestion(no_crate_suggestion)]
     //~^ ERROR suggestion without `code = "..."`
     suggestion: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
-#[multipart_suggestion(suggestion)]
+#[diag(no_crate_example, code = "E0123")]
+#[multipart_suggestion(no_crate_suggestion)]
 //~^ ERROR `#[multipart_suggestion(...)]` is not a valid attribute
 //~| ERROR cannot find attribute `multipart_suggestion` in this scope
 #[multipart_suggestion()]
 //~^ ERROR `#[multipart_suggestion(...)]` is not a valid attribute
 //~| ERROR cannot find attribute `multipart_suggestion` in this scope
 struct MultipartSuggestion {
-    #[multipart_suggestion(suggestion)]
+    #[multipart_suggestion(no_crate_suggestion)]
     //~^ ERROR `#[multipart_suggestion(...)]` is not a valid attribute
     //~| ERROR cannot find attribute `multipart_suggestion` in this scope
     suggestion: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
-#[suggestion(suggestion, code = "...")]
+#[diag(no_crate_example, code = "E0123")]
+#[suggestion(no_crate_suggestion, code = "...")]
 //~^ ERROR `#[suggestion(...)]` is not a valid attribute
 struct SuggestionOnStruct {
     #[primary_span]
@@ -647,7 +649,7 @@ struct SuggestionOnStruct {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 #[label]
 //~^ ERROR `#[label]` is not a valid attribute
 struct LabelOnStruct {
@@ -657,30 +659,30 @@ struct LabelOnStruct {
 
 #[derive(Diagnostic)]
 enum ExampleEnum {
-    #[diag(compiletest_example)]
+    #[diag(no_crate_example)]
     Foo {
         #[primary_span]
         sp: Span,
         #[note]
         note_sp: Span,
     },
-    #[diag(compiletest_example)]
+    #[diag(no_crate_example)]
     Bar {
         #[primary_span]
         sp: Span,
     },
-    #[diag(compiletest_example)]
+    #[diag(no_crate_example)]
     Baz,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct RawIdentDiagnosticArg {
     pub r#type: String,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SubdiagnosticBad {
     #[subdiagnostic(bad)]
     //~^ ERROR `#[subdiagnostic(...)]` is not a valid attribute
@@ -688,7 +690,7 @@ struct SubdiagnosticBad {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SubdiagnosticBadStr {
     #[subdiagnostic = "bad"]
     //~^ ERROR `#[subdiagnostic = ...]` is not a valid attribute
@@ -696,7 +698,7 @@ struct SubdiagnosticBadStr {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SubdiagnosticBadTwice {
     #[subdiagnostic(bad, bad)]
     //~^ ERROR `#[subdiagnostic(...)]` is not a valid attribute
@@ -704,7 +706,7 @@ struct SubdiagnosticBadTwice {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SubdiagnosticBadLitStr {
     #[subdiagnostic("bad")]
     //~^ ERROR `#[subdiagnostic(...)]` is not a valid attribute
@@ -712,7 +714,7 @@ struct SubdiagnosticBadLitStr {
 }
 
 #[derive(LintDiagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SubdiagnosticEagerLint {
     #[subdiagnostic(eager)]
     //~^ ERROR `#[subdiagnostic(...)]` is not a valid attribute
@@ -720,7 +722,7 @@ struct SubdiagnosticEagerLint {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SubdiagnosticEagerCorrect {
     #[subdiagnostic(eager)]
     note: Note,
@@ -731,7 +733,7 @@ struct SubdiagnosticEagerCorrect {
 // after the `span_suggestion` call - which breaks eager translation.
 
 #[derive(Subdiagnostic)]
-#[suggestion(use_instead, applicability = "machine-applicable", code = "{correct}")]
+#[suggestion(no_crate_example, applicability = "machine-applicable", code = "{correct}")]
 pub(crate) struct SubdiagnosticWithSuggestion {
     #[primary_span]
     span: Span,
@@ -740,7 +742,7 @@ pub(crate) struct SubdiagnosticWithSuggestion {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SubdiagnosticEagerSuggestion {
     #[subdiagnostic(eager)]
     sub: SubdiagnosticWithSuggestion,
@@ -748,7 +750,7 @@ struct SubdiagnosticEagerSuggestion {
 
 /// with a doc comment on the type..
 #[derive(Diagnostic)]
-#[diag(compiletest_example, code = "E0123")]
+#[diag(no_crate_example, code = "E0123")]
 struct WithDocComment {
     /// ..and the field
     #[primary_span]
@@ -756,21 +758,21 @@ struct WithDocComment {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SuggestionsGood {
     #[suggestion(code("foo", "bar"))]
     sub: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SuggestionsSingleItem {
     #[suggestion(code("foo"))]
     sub: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SuggestionsNoItem {
     #[suggestion(code())]
     //~^ ERROR expected at least one string literal for `code(...)`
@@ -778,7 +780,7 @@ struct SuggestionsNoItem {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SuggestionsInvalidItem {
     #[suggestion(code(foo))]
     //~^ ERROR `code(...)` must contain only string literals
@@ -786,7 +788,7 @@ struct SuggestionsInvalidItem {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SuggestionsInvalidLiteral {
     #[suggestion(code = 3)]
     //~^ ERROR `code = "..."`/`code(...)` must contain only string literals
@@ -794,16 +796,16 @@ struct SuggestionsInvalidLiteral {
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SuggestionStyleGood {
     #[suggestion(code = "", style = "hidden")]
     sub: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(compiletest_example)]
+#[diag(no_crate_example)]
 struct SuggestionOnVec {
-    #[suggestion(suggestion, code = "")]
+    #[suggestion(no_crate_suggestion, code = "")]
     //~^ ERROR `#[suggestion(...)]` is not a valid attribute
     sub: Vec<Span>,
 }
diff --git a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr
index 61806c80efc..fc0cd8419e4 100644
--- a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr
+++ b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr
@@ -1,11 +1,11 @@
 error: unsupported type attribute for diagnostic derive enum
-  --> $DIR/diagnostic-derive.rs:39:1
+  --> $DIR/diagnostic-derive.rs:41:1
    |
-LL | #[diag(compiletest_example, code = "E0123")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[diag(no_crate_example, code = "E0123")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:42:5
+  --> $DIR/diagnostic-derive.rs:44:5
    |
 LL |     Foo,
    |     ^^^
@@ -13,7 +13,7 @@ LL |     Foo,
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:44:5
+  --> $DIR/diagnostic-derive.rs:46:5
    |
 LL |     Bar,
    |     ^^^
@@ -21,21 +21,21 @@ LL |     Bar,
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: `#[diag = ...]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:50:1
+  --> $DIR/diagnostic-derive.rs:52:1
    |
 LL | #[diag = "E0123"]
    | ^^^^^^^^^^^^^^^^^
 
 error: `#[nonsense(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:55:1
+  --> $DIR/diagnostic-derive.rs:57:1
    |
-LL | #[nonsense(compiletest_example, code = "E0123")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[nonsense(no_crate_example, code = "E0123")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:55:1
+  --> $DIR/diagnostic-derive.rs:57:1
    |
-LL | / #[nonsense(compiletest_example, code = "E0123")]
+LL | / #[nonsense(no_crate_example, code = "E0123")]
 LL | |
 LL | |
 LL | |
@@ -45,7 +45,7 @@ LL | | struct InvalidStructAttr {}
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: `#[diag("...")]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:62:8
+  --> $DIR/diagnostic-derive.rs:64:8
    |
 LL | #[diag("E0123")]
    |        ^^^^^^^
@@ -53,7 +53,7 @@ LL | #[diag("E0123")]
    = help: a diagnostic slug is required as the first argument
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:62:1
+  --> $DIR/diagnostic-derive.rs:64:1
    |
 LL | / #[diag("E0123")]
 LL | |
@@ -64,7 +64,7 @@ LL | | struct InvalidLitNestedAttr {}
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: `#[diag(nonsense(...))]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:73:8
+  --> $DIR/diagnostic-derive.rs:75:8
    |
 LL | #[diag(nonsense("foo"), code = "E0123", slug = "foo")]
    |        ^^^^^^^^^^^^^^^
@@ -72,7 +72,7 @@ LL | #[diag(nonsense("foo"), code = "E0123", slug = "foo")]
    = help: a diagnostic slug is required as the first argument
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:73:1
+  --> $DIR/diagnostic-derive.rs:75:1
    |
 LL | / #[diag(nonsense("foo"), code = "E0123", slug = "foo")]
 LL | |
@@ -83,7 +83,7 @@ LL | | struct InvalidNestedStructAttr1 {}
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: `#[diag(nonsense = ...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:79:8
+  --> $DIR/diagnostic-derive.rs:81:8
    |
 LL | #[diag(nonsense = "...", code = "E0123", slug = "foo")]
    |        ^^^^^^^^^^^^^^^^
@@ -91,7 +91,7 @@ LL | #[diag(nonsense = "...", code = "E0123", slug = "foo")]
    = help: only `code` is a valid nested attributes following the slug
 
 error: `#[diag(slug = ...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:79:42
+  --> $DIR/diagnostic-derive.rs:81:42
    |
 LL | #[diag(nonsense = "...", code = "E0123", slug = "foo")]
    |                                          ^^^^^^^^^^^^
@@ -99,7 +99,7 @@ LL | #[diag(nonsense = "...", code = "E0123", slug = "foo")]
    = help: only `code` is a valid nested attributes following the slug
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:79:1
+  --> $DIR/diagnostic-derive.rs:81:1
    |
 LL | / #[diag(nonsense = "...", code = "E0123", slug = "foo")]
 LL | |
@@ -111,13 +111,13 @@ LL | | struct InvalidNestedStructAttr2 {}
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: `#[diag(nonsense = ...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:86:8
+  --> $DIR/diagnostic-derive.rs:88:8
    |
 LL | #[diag(nonsense = 4, code = "E0123", slug = "foo")]
    |        ^^^^^^^^^^^^
 
 error: `#[diag(slug = ...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:86:38
+  --> $DIR/diagnostic-derive.rs:88:38
    |
 LL | #[diag(nonsense = 4, code = "E0123", slug = "foo")]
    |                                      ^^^^^^^^^^^^
@@ -125,7 +125,7 @@ LL | #[diag(nonsense = 4, code = "E0123", slug = "foo")]
    = help: only `code` is a valid nested attributes following the slug
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:86:1
+  --> $DIR/diagnostic-derive.rs:88:1
    |
 LL | / #[diag(nonsense = 4, code = "E0123", slug = "foo")]
 LL | |
@@ -137,65 +137,65 @@ LL | | struct InvalidNestedStructAttr3 {}
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: `#[diag(slug = ...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:93:45
+  --> $DIR/diagnostic-derive.rs:95:42
    |
-LL | #[diag(compiletest_example, code = "E0123", slug = "foo")]
-   |                                             ^^^^^^^^^^^^
+LL | #[diag(no_crate_example, code = "E0123", slug = "foo")]
+   |                                          ^^^^^^^^^^^^
    |
    = help: only `code` is a valid nested attributes following the slug
 
 error: `#[suggestion = ...]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:100:5
+  --> $DIR/diagnostic-derive.rs:102:5
    |
 LL |     #[suggestion = "bar"]
    |     ^^^^^^^^^^^^^^^^^^^^^
 
 error: specified multiple times
-  --> $DIR/diagnostic-derive.rs:107:8
+  --> $DIR/diagnostic-derive.rs:109:8
    |
-LL | #[diag(compiletest_example, code = "E0456")]
-   |        ^^^^^^^^^^^^^^^^^^^
+LL | #[diag(no_crate_example, code = "E0456")]
+   |        ^^^^^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/diagnostic-derive.rs:106:8
+  --> $DIR/diagnostic-derive.rs:108:8
    |
-LL | #[diag(compiletest_example, code = "E0123")]
-   |        ^^^^^^^^^^^^^^^^^^^
+LL | #[diag(no_crate_example, code = "E0123")]
+   |        ^^^^^^^^^^^^^^^^
 
 error: specified multiple times
-  --> $DIR/diagnostic-derive.rs:107:36
+  --> $DIR/diagnostic-derive.rs:109:33
    |
-LL | #[diag(compiletest_example, code = "E0456")]
-   |                                    ^^^^^^^
+LL | #[diag(no_crate_example, code = "E0456")]
+   |                                 ^^^^^^^
    |
 note: previously specified here
-  --> $DIR/diagnostic-derive.rs:106:36
+  --> $DIR/diagnostic-derive.rs:108:33
    |
-LL | #[diag(compiletest_example, code = "E0123")]
-   |                                    ^^^^^^^
+LL | #[diag(no_crate_example, code = "E0123")]
+   |                                 ^^^^^^^
 
 error: specified multiple times
-  --> $DIR/diagnostic-derive.rs:113:52
+  --> $DIR/diagnostic-derive.rs:115:49
    |
-LL | #[diag(compiletest_example, code = "E0456", code = "E0457")]
-   |                                                    ^^^^^^^
+LL | #[diag(no_crate_example, code = "E0456", code = "E0457")]
+   |                                                 ^^^^^^^
    |
 note: previously specified here
-  --> $DIR/diagnostic-derive.rs:113:36
+  --> $DIR/diagnostic-derive.rs:115:33
    |
-LL | #[diag(compiletest_example, code = "E0456", code = "E0457")]
-   |                                    ^^^^^^^
+LL | #[diag(no_crate_example, code = "E0456", code = "E0457")]
+   |                                 ^^^^^^^
 
-error: `#[diag(compiletest_example)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:118:29
+error: `#[diag(no_crate::example)]` is not a valid attribute
+  --> $DIR/diagnostic-derive.rs:120:26
    |
-LL | #[diag(compiletest_example, compiletest_example, code = "E0456")]
-   |                             ^^^^^^^^^^^^^^^^^^^
+LL | #[diag(no_crate_example, no_crate::example, code = "E0456")]
+   |                          ^^^^^^^^^^^^^^^^^
    |
    = help: diagnostic slug must be the first argument
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:123:1
+  --> $DIR/diagnostic-derive.rs:125:1
    |
 LL | struct KindNotProvided {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -203,7 +203,7 @@ LL | struct KindNotProvided {}
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:126:1
+  --> $DIR/diagnostic-derive.rs:128:1
    |
 LL | / #[diag(code = "E0456")]
 LL | |
@@ -213,31 +213,31 @@ LL | | struct SlugNotProvided {}
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: the `#[primary_span]` attribute can only be applied to fields of type `Span` or `MultiSpan`
-  --> $DIR/diagnostic-derive.rs:137:5
+  --> $DIR/diagnostic-derive.rs:139:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
 
 error: `#[nonsense]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:145:5
+  --> $DIR/diagnostic-derive.rs:147:5
    |
 LL |     #[nonsense]
    |     ^^^^^^^^^^^
 
 error: the `#[label(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan`
-  --> $DIR/diagnostic-derive.rs:162:5
+  --> $DIR/diagnostic-derive.rs:164:5
    |
-LL |     #[label(label)]
-   |     ^^^^^^^^^^^^^^^
+LL |     #[label(no_crate_label)]
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `name` doesn't refer to a field on this type
-  --> $DIR/diagnostic-derive.rs:170:37
+  --> $DIR/diagnostic-derive.rs:172:46
    |
-LL |     #[suggestion(suggestion, code = "{name}")]
-   |                                     ^^^^^^^^
+LL |     #[suggestion(no_crate_suggestion, code = "{name}")]
+   |                                              ^^^^^^^^
 
 error: invalid format string: expected `'}'` but string was terminated
-  --> $DIR/diagnostic-derive.rs:175:10
+  --> $DIR/diagnostic-derive.rs:177:10
    |
 LL | #[derive(Diagnostic)]
    |          ^^^^^^^^^^ expected `'}'` in format string
@@ -246,7 +246,7 @@ LL | #[derive(Diagnostic)]
    = note: this error originates in the derive macro `Diagnostic` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: invalid format string: unmatched `}` found
-  --> $DIR/diagnostic-derive.rs:185:10
+  --> $DIR/diagnostic-derive.rs:187:10
    |
 LL | #[derive(Diagnostic)]
    |          ^^^^^^^^^^ unmatched `}` in format string
@@ -255,19 +255,19 @@ LL | #[derive(Diagnostic)]
    = note: this error originates in the derive macro `Diagnostic` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: the `#[label(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan`
-  --> $DIR/diagnostic-derive.rs:205:5
+  --> $DIR/diagnostic-derive.rs:207:5
    |
-LL |     #[label(label)]
-   |     ^^^^^^^^^^^^^^^
+LL |     #[label(no_crate_label)]
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: suggestion without `code = "..."`
-  --> $DIR/diagnostic-derive.rs:224:5
+  --> $DIR/diagnostic-derive.rs:226:5
    |
-LL |     #[suggestion(suggestion)]
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     #[suggestion(no_crate_suggestion)]
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `#[suggestion(nonsense = ...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:232:18
+  --> $DIR/diagnostic-derive.rs:234:18
    |
 LL |     #[suggestion(nonsense = "bar")]
    |                  ^^^^^^^^^^^^^^^^
@@ -275,13 +275,13 @@ LL |     #[suggestion(nonsense = "bar")]
    = help: only `style`, `code` and `applicability` are valid nested attributes
 
 error: suggestion without `code = "..."`
-  --> $DIR/diagnostic-derive.rs:232:5
+  --> $DIR/diagnostic-derive.rs:234:5
    |
 LL |     #[suggestion(nonsense = "bar")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `#[suggestion(msg = ...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:241:18
+  --> $DIR/diagnostic-derive.rs:243:18
    |
 LL |     #[suggestion(msg = "bar")]
    |                  ^^^^^^^^^^^
@@ -289,15 +289,15 @@ LL |     #[suggestion(msg = "bar")]
    = help: only `style`, `code` and `applicability` are valid nested attributes
 
 error: suggestion without `code = "..."`
-  --> $DIR/diagnostic-derive.rs:241:5
+  --> $DIR/diagnostic-derive.rs:243:5
    |
 LL |     #[suggestion(msg = "bar")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: wrong field type for suggestion
-  --> $DIR/diagnostic-derive.rs:264:5
+  --> $DIR/diagnostic-derive.rs:266:5
    |
-LL | /     #[suggestion(suggestion, code = "This is suggested code")]
+LL | /     #[suggestion(no_crate_suggestion, code = "This is suggested code")]
 LL | |
 LL | |     suggestion: Applicability,
    | |_____________________________^
@@ -305,75 +305,75 @@ LL | |     suggestion: Applicability,
    = help: `#[suggestion(...)]` should be applied to fields of type `Span` or `(Span, Applicability)`
 
 error: specified multiple times
-  --> $DIR/diagnostic-derive.rs:280:24
+  --> $DIR/diagnostic-derive.rs:282:24
    |
 LL |     suggestion: (Span, Span, Applicability),
    |                        ^^^^
    |
 note: previously specified here
-  --> $DIR/diagnostic-derive.rs:280:18
+  --> $DIR/diagnostic-derive.rs:282:18
    |
 LL |     suggestion: (Span, Span, Applicability),
    |                  ^^^^
 
 error: specified multiple times
-  --> $DIR/diagnostic-derive.rs:288:33
+  --> $DIR/diagnostic-derive.rs:290:33
    |
 LL |     suggestion: (Applicability, Applicability, Span),
    |                                 ^^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/diagnostic-derive.rs:288:18
+  --> $DIR/diagnostic-derive.rs:290:18
    |
 LL |     suggestion: (Applicability, Applicability, Span),
    |                  ^^^^^^^^^^^^^
 
 error: `#[label = ...]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:295:5
+  --> $DIR/diagnostic-derive.rs:297:5
    |
 LL |     #[label = "bar"]
    |     ^^^^^^^^^^^^^^^^
 
 error: specified multiple times
-  --> $DIR/diagnostic-derive.rs:446:44
+  --> $DIR/diagnostic-derive.rs:448:53
    |
-LL |     #[suggestion(suggestion, code = "...", applicability = "maybe-incorrect")]
-   |                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     #[suggestion(no_crate_suggestion, code = "...", applicability = "maybe-incorrect")]
+   |                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/diagnostic-derive.rs:448:24
+  --> $DIR/diagnostic-derive.rs:450:24
    |
 LL |     suggestion: (Span, Applicability),
    |                        ^^^^^^^^^^^^^
 
 error: invalid applicability
-  --> $DIR/diagnostic-derive.rs:454:44
+  --> $DIR/diagnostic-derive.rs:456:53
    |
-LL |     #[suggestion(suggestion, code = "...", applicability = "batman")]
-   |                                            ^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     #[suggestion(no_crate_suggestion, code = "...", applicability = "batman")]
+   |                                                     ^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `#[label(foo)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:517:20
+  --> $DIR/diagnostic-derive.rs:519:29
    |
-LL |     #[label(label, foo)]
-   |                    ^^^
+LL |     #[label(no_crate_label, foo)]
+   |                             ^^^
    |
    = help: a diagnostic slug must be the first argument to the attribute
 
 error: `#[label(foo = ...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:525:20
+  --> $DIR/diagnostic-derive.rs:527:29
    |
-LL |     #[label(label, foo = "...")]
-   |                    ^^^^^^^^^^^
+LL |     #[label(no_crate_label, foo = "...")]
+   |                             ^^^^^^^^^^^
 
 error: `#[label(foo(...))]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:533:20
+  --> $DIR/diagnostic-derive.rs:535:29
    |
-LL |     #[label(label, foo("..."))]
-   |                    ^^^^^^^^^^
+LL |     #[label(no_crate_label, foo("..."))]
+   |                             ^^^^^^^^^^
 
 error: `#[primary_span]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:545:5
+  --> $DIR/diagnostic-derive.rs:547:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
@@ -381,15 +381,15 @@ LL |     #[primary_span]
    = help: the `primary_span` field attribute is not valid for lint diagnostics
 
 error: `#[error(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:565:1
+  --> $DIR/diagnostic-derive.rs:567:1
    |
-LL | #[error(compiletest_example, code = "E0123")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[error(no_crate_example, code = "E0123")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:565:1
+  --> $DIR/diagnostic-derive.rs:567:1
    |
-LL | / #[error(compiletest_example, code = "E0123")]
+LL | / #[error(no_crate_example, code = "E0123")]
 LL | |
 LL | |
 LL | |
@@ -399,15 +399,15 @@ LL | | struct ErrorAttribute {}
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: `#[warn_(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:572:1
+  --> $DIR/diagnostic-derive.rs:574:1
    |
-LL | #[warn_(compiletest_example, code = "E0123")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[warn_(no_crate_example, code = "E0123")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:572:1
+  --> $DIR/diagnostic-derive.rs:574:1
    |
-LL | / #[warn_(compiletest_example, code = "E0123")]
+LL | / #[warn_(no_crate_example, code = "E0123")]
 LL | |
 LL | |
 LL | |
@@ -417,15 +417,15 @@ LL | | struct WarnAttribute {}
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: `#[lint(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:579:1
+  --> $DIR/diagnostic-derive.rs:581:1
    |
-LL | #[lint(compiletest_example, code = "E0123")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[lint(no_crate_example, code = "E0123")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:579:1
+  --> $DIR/diagnostic-derive.rs:581:1
    |
-LL | / #[lint(compiletest_example, code = "E0123")]
+LL | / #[lint(no_crate_example, code = "E0123")]
 LL | |
 LL | |
 LL | |
@@ -435,21 +435,21 @@ LL | | struct LintAttributeOnSessionDiag {}
    = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`
 
 error: `#[lint(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:586:1
+  --> $DIR/diagnostic-derive.rs:588:1
    |
-LL | #[lint(compiletest_example, code = "E0123")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[lint(no_crate_example, code = "E0123")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `#[lint(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:586:1
+  --> $DIR/diagnostic-derive.rs:588:1
    |
-LL | #[lint(compiletest_example, code = "E0123")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[lint(no_crate_example, code = "E0123")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: diagnostic slug not specified
-  --> $DIR/diagnostic-derive.rs:586:1
+  --> $DIR/diagnostic-derive.rs:588:1
    |
-LL | / #[lint(compiletest_example, code = "E0123")]
+LL | / #[lint(no_crate_example, code = "E0123")]
 LL | |
 LL | |
 LL | |
@@ -460,19 +460,19 @@ LL | | struct LintAttributeOnLintDiag {}
    = help: specify the slug as the first argument to the attribute, such as `#[diag(compiletest_example)]`
 
 error: specified multiple times
-  --> $DIR/diagnostic-derive.rs:596:44
+  --> $DIR/diagnostic-derive.rs:598:53
    |
-LL |     #[suggestion(suggestion, code = "...", code = ",,,")]
-   |                                            ^^^^^^^^^^^^
+LL |     #[suggestion(no_crate_suggestion, code = "...", code = ",,,")]
+   |                                                     ^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/diagnostic-derive.rs:596:30
+  --> $DIR/diagnostic-derive.rs:598:39
    |
-LL |     #[suggestion(suggestion, code = "...", code = ",,,")]
-   |                              ^^^^^^^^^^^^
+LL |     #[suggestion(no_crate_suggestion, code = "...", code = ",,,")]
+   |                                       ^^^^^^^^^^^^
 
 error: wrong types for suggestion
-  --> $DIR/diagnostic-derive.rs:605:24
+  --> $DIR/diagnostic-derive.rs:607:24
    |
 LL |     suggestion: (Span, usize),
    |                        ^^^^^
@@ -480,7 +480,7 @@ LL |     suggestion: (Span, usize),
    = help: `#[suggestion(...)]` on a tuple field must be applied to fields of type `(Span, Applicability)`
 
 error: wrong types for suggestion
-  --> $DIR/diagnostic-derive.rs:613:17
+  --> $DIR/diagnostic-derive.rs:615:17
    |
 LL |     suggestion: (Span,),
    |                 ^^^^^^^
@@ -488,21 +488,21 @@ LL |     suggestion: (Span,),
    = help: `#[suggestion(...)]` on a tuple field must be applied to fields of type `(Span, Applicability)`
 
 error: suggestion without `code = "..."`
-  --> $DIR/diagnostic-derive.rs:620:5
+  --> $DIR/diagnostic-derive.rs:622:5
    |
-LL |     #[suggestion(suggestion)]
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     #[suggestion(no_crate_suggestion)]
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `#[multipart_suggestion(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:627:1
+  --> $DIR/diagnostic-derive.rs:629:1
    |
-LL | #[multipart_suggestion(suggestion)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[multipart_suggestion(no_crate_suggestion)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: consider creating a `Subdiagnostic` instead
 
 error: `#[multipart_suggestion(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:630:1
+  --> $DIR/diagnostic-derive.rs:632:1
    |
 LL | #[multipart_suggestion()]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -510,23 +510,23 @@ LL | #[multipart_suggestion()]
    = help: consider creating a `Subdiagnostic` instead
 
 error: `#[multipart_suggestion(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:634:5
+  --> $DIR/diagnostic-derive.rs:636:5
    |
-LL |     #[multipart_suggestion(suggestion)]
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     #[multipart_suggestion(no_crate_suggestion)]
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: consider creating a `Subdiagnostic` instead
 
 error: `#[suggestion(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:642:1
+  --> $DIR/diagnostic-derive.rs:644:1
    |
-LL | #[suggestion(suggestion, code = "...")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[suggestion(no_crate_suggestion, code = "...")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: `#[label]` and `#[suggestion]` can only be applied to fields
 
 error: `#[label]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:651:1
+  --> $DIR/diagnostic-derive.rs:653:1
    |
 LL | #[label]
    | ^^^^^^^^
@@ -534,7 +534,7 @@ LL | #[label]
    = help: `#[label]` and `#[suggestion]` can only be applied to fields
 
 error: `#[subdiagnostic(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:685:5
+  --> $DIR/diagnostic-derive.rs:687:5
    |
 LL |     #[subdiagnostic(bad)]
    |     ^^^^^^^^^^^^^^^^^^^^^
@@ -542,13 +542,13 @@ LL |     #[subdiagnostic(bad)]
    = help: `eager` is the only supported nested attribute for `subdiagnostic`
 
 error: `#[subdiagnostic = ...]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:693:5
+  --> $DIR/diagnostic-derive.rs:695:5
    |
 LL |     #[subdiagnostic = "bad"]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `#[subdiagnostic(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:701:5
+  --> $DIR/diagnostic-derive.rs:703:5
    |
 LL |     #[subdiagnostic(bad, bad)]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -556,7 +556,7 @@ LL |     #[subdiagnostic(bad, bad)]
    = help: `eager` is the only supported nested attribute for `subdiagnostic`
 
 error: `#[subdiagnostic(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:709:5
+  --> $DIR/diagnostic-derive.rs:711:5
    |
 LL |     #[subdiagnostic("bad")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^
@@ -564,7 +564,7 @@ LL |     #[subdiagnostic("bad")]
    = help: `eager` is the only supported nested attribute for `subdiagnostic`
 
 error: `#[subdiagnostic(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:717:5
+  --> $DIR/diagnostic-derive.rs:719:5
    |
 LL |     #[subdiagnostic(eager)]
    |     ^^^^^^^^^^^^^^^^^^^^^^^
@@ -572,95 +572,95 @@ LL |     #[subdiagnostic(eager)]
    = help: eager subdiagnostics are not supported on lints
 
 error: expected at least one string literal for `code(...)`
-  --> $DIR/diagnostic-derive.rs:775:18
+  --> $DIR/diagnostic-derive.rs:777:18
    |
 LL |     #[suggestion(code())]
    |                  ^^^^^^
 
 error: `code(...)` must contain only string literals
-  --> $DIR/diagnostic-derive.rs:783:23
+  --> $DIR/diagnostic-derive.rs:785:23
    |
 LL |     #[suggestion(code(foo))]
    |                       ^^^
 
 error: `code = "..."`/`code(...)` must contain only string literals
-  --> $DIR/diagnostic-derive.rs:791:18
+  --> $DIR/diagnostic-derive.rs:793:18
    |
 LL |     #[suggestion(code = 3)]
    |                  ^^^^^^^^
 
 error: `#[suggestion(...)]` is not a valid attribute
-  --> $DIR/diagnostic-derive.rs:806:5
+  --> $DIR/diagnostic-derive.rs:808:5
    |
-LL |     #[suggestion(suggestion, code = "")]
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     #[suggestion(no_crate_suggestion, code = "")]
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[suggestion(...)]` applied to `Vec` field is ambiguous
    = help: to show a suggestion consisting of multiple parts, use a `Subdiagnostic` annotated with `#[multipart_suggestion(...)]`
    = help: to show a variable set of suggestions, use a `Vec` of `Subdiagnostic`s annotated with `#[suggestion(...)]`
 
 error: cannot find attribute `nonsense` in this scope
-  --> $DIR/diagnostic-derive.rs:55:3
+  --> $DIR/diagnostic-derive.rs:57:3
    |
-LL | #[nonsense(compiletest_example, code = "E0123")]
+LL | #[nonsense(no_crate_example, code = "E0123")]
    |   ^^^^^^^^
 
 error: cannot find attribute `nonsense` in this scope
-  --> $DIR/diagnostic-derive.rs:145:7
+  --> $DIR/diagnostic-derive.rs:147:7
    |
 LL |     #[nonsense]
    |       ^^^^^^^^
 
 error: cannot find attribute `error` in this scope
-  --> $DIR/diagnostic-derive.rs:565:3
+  --> $DIR/diagnostic-derive.rs:567:3
    |
-LL | #[error(compiletest_example, code = "E0123")]
+LL | #[error(no_crate_example, code = "E0123")]
    |   ^^^^^
 
 error: cannot find attribute `warn_` in this scope
-  --> $DIR/diagnostic-derive.rs:572:3
+  --> $DIR/diagnostic-derive.rs:574:3
    |
-LL | #[warn_(compiletest_example, code = "E0123")]
+LL | #[warn_(no_crate_example, code = "E0123")]
    |   ^^^^^ help: a built-in attribute with a similar name exists: `warn`
 
 error: cannot find attribute `lint` in this scope
-  --> $DIR/diagnostic-derive.rs:579:3
+  --> $DIR/diagnostic-derive.rs:581:3
    |
-LL | #[lint(compiletest_example, code = "E0123")]
+LL | #[lint(no_crate_example, code = "E0123")]
    |   ^^^^ help: a built-in attribute with a similar name exists: `link`
 
 error: cannot find attribute `lint` in this scope
-  --> $DIR/diagnostic-derive.rs:586:3
+  --> $DIR/diagnostic-derive.rs:588:3
    |
-LL | #[lint(compiletest_example, code = "E0123")]
+LL | #[lint(no_crate_example, code = "E0123")]
    |   ^^^^ help: a built-in attribute with a similar name exists: `link`
 
 error: cannot find attribute `multipart_suggestion` in this scope
-  --> $DIR/diagnostic-derive.rs:627:3
+  --> $DIR/diagnostic-derive.rs:629:3
    |
-LL | #[multipart_suggestion(suggestion)]
+LL | #[multipart_suggestion(no_crate_suggestion)]
    |   ^^^^^^^^^^^^^^^^^^^^
 
 error: cannot find attribute `multipart_suggestion` in this scope
-  --> $DIR/diagnostic-derive.rs:630:3
+  --> $DIR/diagnostic-derive.rs:632:3
    |
 LL | #[multipart_suggestion()]
    |   ^^^^^^^^^^^^^^^^^^^^
 
 error: cannot find attribute `multipart_suggestion` in this scope
-  --> $DIR/diagnostic-derive.rs:634:7
+  --> $DIR/diagnostic-derive.rs:636:7
    |
-LL |     #[multipart_suggestion(suggestion)]
+LL |     #[multipart_suggestion(no_crate_suggestion)]
    |       ^^^^^^^^^^^^^^^^^^^^
 
-error[E0425]: cannot find value `nonsense` in module `rustc_errors::fluent`
-  --> $DIR/diagnostic-derive.rs:68:8
+error[E0425]: cannot find value `nonsense` in module `crate::fluent_generated`
+  --> $DIR/diagnostic-derive.rs:70:8
    |
 LL | #[diag(nonsense, code = "E0123")]
-   |        ^^^^^^^^ not found in `rustc_errors::fluent`
+   |        ^^^^^^^^ not found in `crate::fluent_generated`
 
 error[E0277]: the trait bound `Hello: IntoDiagnosticArg` is not satisfied
-  --> $DIR/diagnostic-derive.rs:339:10
+  --> $DIR/diagnostic-derive.rs:341:10
    |
 LL | #[derive(Diagnostic)]
    |          ^^^^^^^^^^ the trait `IntoDiagnosticArg` is not implemented for `Hello`
diff --git a/tests/ui-fulldeps/session-diagnostic/example.ftl b/tests/ui-fulldeps/session-diagnostic/example.ftl
new file mode 100644
index 00000000000..cb2d476d815
--- /dev/null
+++ b/tests/ui-fulldeps/session-diagnostic/example.ftl
@@ -0,0 +1,5 @@
+no_crate_example = this is an example message used in testing
+    .note = with a note
+    .help = with a help
+    .suggestion = with a suggestion
+    .label = with a label
diff --git a/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.rs b/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.rs
index 09ad6964909..c882f7792d5 100644
--- a/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.rs
+++ b/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.rs
@@ -15,12 +15,14 @@ extern crate rustc_macros;
 extern crate rustc_session;
 extern crate rustc_span;
 
-use rustc_errors::Applicability;
-use rustc_macros::Subdiagnostic;
+use rustc_errors::{Applicability, DiagnosticMessage, SubdiagnosticMessage};
+use rustc_macros::{fluent_messages, Subdiagnostic};
 use rustc_span::Span;
 
+fluent_messages! { "./example.ftl" }
+
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 struct A {
     #[primary_span]
     span: Span,
@@ -29,13 +31,13 @@ struct A {
 
 #[derive(Subdiagnostic)]
 enum B {
-    #[label(parse_add_paren)]
+    #[label(no_crate_example)]
     A {
         #[primary_span]
         span: Span,
         var: String,
     },
-    #[label(parse_add_paren)]
+    #[label(no_crate_example)]
     B {
         #[primary_span]
         span: Span,
@@ -44,7 +46,7 @@ enum B {
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 //~^ ERROR label without `#[primary_span]` field
 struct C {
     var: String,
@@ -120,8 +122,8 @@ struct K {
 
 #[derive(Subdiagnostic)]
 #[label(slug)]
-//~^ ERROR cannot find value `slug` in module `rustc_errors::fluent`
-//~^^ NOTE not found in `rustc_errors::fluent`
+//~^ ERROR cannot find value `slug` in module `crate::fluent_generated`
+//~^^ NOTE not found in `crate::fluent_generated`
 struct L {
     #[primary_span]
     span: Span,
@@ -138,7 +140,7 @@ struct M {
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren, code = "...")]
+#[label(no_crate_example, code = "...")]
 //~^ ERROR `#[label(code = ...)]` is not a valid attribute
 struct N {
     #[primary_span]
@@ -147,7 +149,7 @@ struct N {
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren, applicability = "machine-applicable")]
+#[label(no_crate_example, applicability = "machine-applicable")]
 //~^ ERROR `#[label(applicability = ...)]` is not a valid attribute
 struct O {
     #[primary_span]
@@ -160,7 +162,7 @@ struct O {
 //~^ ERROR cannot find attribute `foo` in this scope
 //~^^ ERROR unsupported type attribute for subdiagnostic enum
 enum P {
-    #[label(parse_add_paren)]
+    #[label(no_crate_example)]
     A {
         #[primary_span]
         span: Span,
@@ -230,7 +232,7 @@ enum U {
 
 #[derive(Subdiagnostic)]
 enum V {
-    #[label(parse_add_paren)]
+    #[label(no_crate_example)]
     A {
         #[primary_span]
         span: Span,
@@ -244,7 +246,7 @@ enum V {
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 //~^ ERROR label without `#[primary_span]` field
 struct W {
     #[primary_span]
@@ -253,7 +255,7 @@ struct W {
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 struct X {
     #[primary_span]
     span: Span,
@@ -263,7 +265,7 @@ struct X {
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 struct Y {
     #[primary_span]
     span: Span,
@@ -274,7 +276,7 @@ struct Y {
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 struct Z {
     #[primary_span]
     span: Span,
@@ -285,7 +287,7 @@ struct Z {
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 struct AA {
     #[primary_span]
     span: Span,
@@ -296,7 +298,7 @@ struct AA {
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 struct AB {
     #[primary_span]
     span: Span,
@@ -312,23 +314,23 @@ union AC {
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
+#[label(no_crate_example)]
 struct AD {
     #[primary_span]
     span: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren, parse_add_paren)]
-//~^ ERROR `#[label(parse_add_paren)]` is not a valid attribute
+#[label(no_crate_example, no_crate::example)]
+//~^ ERROR `#[label(no_crate::example)]` is not a valid attribute
 struct AE {
     #[primary_span]
     span: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 struct AF {
     #[primary_span]
     //~^ NOTE previously specified here
@@ -346,7 +348,7 @@ struct AG {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "...")]
+#[suggestion(no_crate_example, code = "...")]
 struct AH {
     #[primary_span]
     span: Span,
@@ -357,7 +359,7 @@ struct AH {
 
 #[derive(Subdiagnostic)]
 enum AI {
-    #[suggestion(parse_add_paren, code = "...")]
+    #[suggestion(no_crate_example, code = "...")]
     A {
         #[primary_span]
         span: Span,
@@ -365,7 +367,7 @@ enum AI {
         applicability: Applicability,
         var: String,
     },
-    #[suggestion(parse_add_paren, code = "...")]
+    #[suggestion(no_crate_example, code = "...")]
     B {
         #[primary_span]
         span: Span,
@@ -376,7 +378,7 @@ enum AI {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "...", code = "...")]
+#[suggestion(no_crate_example, code = "...", code = "...")]
 //~^ ERROR specified multiple times
 //~^^ NOTE previously specified here
 struct AJ {
@@ -387,7 +389,7 @@ struct AJ {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "...")]
+#[suggestion(no_crate_example, code = "...")]
 struct AK {
     #[primary_span]
     span: Span,
@@ -400,7 +402,7 @@ struct AK {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "...")]
+#[suggestion(no_crate_example, code = "...")]
 struct AL {
     #[primary_span]
     span: Span,
@@ -410,14 +412,14 @@ struct AL {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "...")]
+#[suggestion(no_crate_example, code = "...")]
 struct AM {
     #[primary_span]
     span: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren)]
+#[suggestion(no_crate_example)]
 //~^ ERROR suggestion without `code = "..."`
 struct AN {
     #[primary_span]
@@ -427,7 +429,7 @@ struct AN {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "...", applicability = "foo")]
+#[suggestion(no_crate_example, code = "...", applicability = "foo")]
 //~^ ERROR invalid applicability
 struct AO {
     #[primary_span]
@@ -435,24 +437,24 @@ struct AO {
 }
 
 #[derive(Subdiagnostic)]
-#[help(parse_add_paren)]
+#[help(no_crate_example)]
 struct AP {
     var: String,
 }
 
 #[derive(Subdiagnostic)]
-#[note(parse_add_paren)]
+#[note(no_crate_example)]
 struct AQ;
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "...")]
+#[suggestion(no_crate_example, code = "...")]
 //~^ ERROR suggestion without `#[primary_span]` field
 struct AR {
     var: String,
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "...", applicability = "machine-applicable")]
+#[suggestion(no_crate_example, code = "...", applicability = "machine-applicable")]
 struct AS {
     #[primary_span]
     span: Span,
@@ -462,7 +464,7 @@ struct AS {
 #[label]
 //~^ ERROR unsupported type attribute for subdiagnostic enum
 enum AT {
-    #[label(parse_add_paren)]
+    #[label(no_crate_example)]
     A {
         #[primary_span]
         span: Span,
@@ -471,7 +473,7 @@ enum AT {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "{var}", applicability = "machine-applicable")]
+#[suggestion(no_crate_example, code = "{var}", applicability = "machine-applicable")]
 struct AU {
     #[primary_span]
     span: Span,
@@ -479,7 +481,7 @@ struct AU {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "{var}", applicability = "machine-applicable")]
+#[suggestion(no_crate_example, code = "{var}", applicability = "machine-applicable")]
 //~^ ERROR `var` doesn't refer to a field on this type
 struct AV {
     #[primary_span]
@@ -488,7 +490,7 @@ struct AV {
 
 #[derive(Subdiagnostic)]
 enum AW {
-    #[suggestion(parse_add_paren, code = "{var}", applicability = "machine-applicable")]
+    #[suggestion(no_crate_example, code = "{var}", applicability = "machine-applicable")]
     A {
         #[primary_span]
         span: Span,
@@ -498,7 +500,7 @@ enum AW {
 
 #[derive(Subdiagnostic)]
 enum AX {
-    #[suggestion(parse_add_paren, code = "{var}", applicability = "machine-applicable")]
+    #[suggestion(no_crate_example, code = "{var}", applicability = "machine-applicable")]
     //~^ ERROR `var` doesn't refer to a field on this type
     A {
         #[primary_span]
@@ -507,18 +509,18 @@ enum AX {
 }
 
 #[derive(Subdiagnostic)]
-#[warning(parse_add_paren)]
+#[warning(no_crate_example)]
 struct AY {}
 
 #[derive(Subdiagnostic)]
-#[warning(parse_add_paren)]
+#[warning(no_crate_example)]
 struct AZ {
     #[primary_span]
     span: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "...")]
+#[suggestion(no_crate_example, code = "...")]
 //~^ ERROR suggestion without `#[primary_span]` field
 struct BA {
     #[suggestion_part]
@@ -533,7 +535,7 @@ struct BA {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren, code = "...", applicability = "machine-applicable")]
+#[multipart_suggestion(no_crate_example, code = "...", applicability = "machine-applicable")]
 //~^ ERROR multipart suggestion without any `#[suggestion_part(...)]` fields
 //~| ERROR `#[multipart_suggestion(code = ...)]` is not a valid attribute
 struct BBa {
@@ -541,7 +543,7 @@ struct BBa {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren, applicability = "machine-applicable")]
+#[multipart_suggestion(no_crate_example, applicability = "machine-applicable")]
 struct BBb {
     #[suggestion_part]
     //~^ ERROR `#[suggestion_part(...)]` attribute without `code = "..."`
@@ -549,7 +551,7 @@ struct BBb {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren, applicability = "machine-applicable")]
+#[multipart_suggestion(no_crate_example, applicability = "machine-applicable")]
 struct BBc {
     #[suggestion_part()]
     //~^ ERROR `#[suggestion_part(...)]` attribute without `code = "..."`
@@ -557,7 +559,7 @@ struct BBc {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren)]
+#[multipart_suggestion(no_crate_example)]
 //~^ ERROR multipart suggestion without any `#[suggestion_part(...)]` fields
 struct BC {
     #[primary_span]
@@ -566,7 +568,7 @@ struct BC {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren)]
+#[multipart_suggestion(no_crate_example)]
 struct BD {
     #[suggestion_part]
     //~^ ERROR `#[suggestion_part(...)]` attribute without `code = "..."`
@@ -586,7 +588,7 @@ struct BD {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren, applicability = "machine-applicable")]
+#[multipart_suggestion(no_crate_example, applicability = "machine-applicable")]
 struct BE {
     #[suggestion_part(code = "...", code = ",,,")]
     //~^ ERROR specified multiple times
@@ -595,7 +597,7 @@ struct BE {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren, applicability = "machine-applicable")]
+#[multipart_suggestion(no_crate_example, applicability = "machine-applicable")]
 struct BF {
     #[suggestion_part(code = "(")]
     first: Span,
@@ -604,7 +606,7 @@ struct BF {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren)]
+#[multipart_suggestion(no_crate_example)]
 struct BG {
     #[applicability]
     appl: Applicability,
@@ -615,7 +617,7 @@ struct BG {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren, applicability = "machine-applicable")]
+#[multipart_suggestion(no_crate_example, applicability = "machine-applicable")]
 struct BH {
     #[applicability]
     //~^ ERROR `#[applicability]` has no effect
@@ -627,14 +629,14 @@ struct BH {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren, applicability = "machine-applicable")]
+#[multipart_suggestion(no_crate_example, applicability = "machine-applicable")]
 struct BI {
     #[suggestion_part(code = "")]
     spans: Vec<Span>,
 }
 
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 struct BJ {
     #[primary_span]
     span: Span,
@@ -643,7 +645,7 @@ struct BJ {
 
 /// with a doc comment on the type..
 #[derive(Subdiagnostic)]
-#[label(parse_add_paren)]
+#[label(no_crate_example)]
 struct BK {
     /// ..and the field
     #[primary_span]
@@ -654,7 +656,7 @@ struct BK {
 #[derive(Subdiagnostic)]
 enum BL {
     /// ..and the variant..
-    #[label(parse_add_paren)]
+    #[label(no_crate_example)]
     Foo {
         /// ..and the field
         #[primary_span]
@@ -663,7 +665,7 @@ enum BL {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren)]
+#[multipart_suggestion(no_crate_example)]
 struct BM {
     #[suggestion_part(code("foo"))]
     //~^ ERROR expected exactly one string literal for `code = ...`
@@ -672,7 +674,7 @@ struct BM {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren)]
+#[multipart_suggestion(no_crate_example)]
 struct BN {
     #[suggestion_part(code("foo", "bar"))]
     //~^ ERROR expected exactly one string literal for `code = ...`
@@ -681,7 +683,7 @@ struct BN {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren)]
+#[multipart_suggestion(no_crate_example)]
 struct BO {
     #[suggestion_part(code(3))]
     //~^ ERROR expected exactly one string literal for `code = ...`
@@ -690,7 +692,7 @@ struct BO {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren)]
+#[multipart_suggestion(no_crate_example)]
 struct BP {
     #[suggestion_part(code())]
     //~^ ERROR expected exactly one string literal for `code = ...`
@@ -699,7 +701,7 @@ struct BP {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(parse_add_paren)]
+#[multipart_suggestion(no_crate_example)]
 struct BQ {
     #[suggestion_part(code = 3)]
     //~^ ERROR `code = "..."`/`code(...)` must contain only string literals
@@ -708,42 +710,42 @@ struct BQ {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "")]
+#[suggestion(no_crate_example, code = "")]
 struct SuggestionStyleDefault {
     #[primary_span]
     sub: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "", style = "short")]
+#[suggestion(no_crate_example, code = "", style = "short")]
 struct SuggestionStyleShort {
     #[primary_span]
     sub: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "", style = "hidden")]
+#[suggestion(no_crate_example, code = "", style = "hidden")]
 struct SuggestionStyleHidden {
     #[primary_span]
     sub: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "", style = "verbose")]
+#[suggestion(no_crate_example, code = "", style = "verbose")]
 struct SuggestionStyleVerbose {
     #[primary_span]
     sub: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "", style = "tool-only")]
+#[suggestion(no_crate_example, code = "", style = "tool-only")]
 struct SuggestionStyleToolOnly {
     #[primary_span]
     sub: Span,
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "", style = "hidden", style = "normal")]
+#[suggestion(no_crate_example, code = "", style = "hidden", style = "normal")]
 //~^ ERROR specified multiple times
 //~| NOTE previously specified here
 struct SuggestionStyleTwice {
@@ -752,7 +754,7 @@ struct SuggestionStyleTwice {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion_hidden(parse_add_paren, code = "")]
+#[suggestion_hidden(no_crate_example, code = "")]
 //~^ ERROR #[suggestion_hidden(...)]` is not a valid attribute
 struct SuggestionStyleOldSyntax {
     #[primary_span]
@@ -760,7 +762,7 @@ struct SuggestionStyleOldSyntax {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion_hidden(parse_add_paren, code = "", style = "normal")]
+#[suggestion_hidden(no_crate_example, code = "", style = "normal")]
 //~^ ERROR #[suggestion_hidden(...)]` is not a valid attribute
 struct SuggestionStyleOldAndNewSyntax {
     #[primary_span]
@@ -768,7 +770,7 @@ struct SuggestionStyleOldAndNewSyntax {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "", style = "foo")]
+#[suggestion(no_crate_example, code = "", style = "foo")]
 //~^ ERROR invalid suggestion style
 struct SuggestionStyleInvalid1 {
     #[primary_span]
@@ -776,7 +778,7 @@ struct SuggestionStyleInvalid1 {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "", style = 42)]
+#[suggestion(no_crate_example, code = "", style = 42)]
 //~^ ERROR `#[suggestion(style = ...)]` is not a valid attribute
 struct SuggestionStyleInvalid2 {
     #[primary_span]
@@ -784,7 +786,7 @@ struct SuggestionStyleInvalid2 {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "", style)]
+#[suggestion(no_crate_example, code = "", style)]
 //~^ ERROR `#[suggestion(style)]` is not a valid attribute
 struct SuggestionStyleInvalid3 {
     #[primary_span]
@@ -792,7 +794,7 @@ struct SuggestionStyleInvalid3 {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "", style("foo"))]
+#[suggestion(no_crate_example, code = "", style("foo"))]
 //~^ ERROR `#[suggestion(style(...))]` is not a valid attribute
 struct SuggestionStyleInvalid4 {
     #[primary_span]
@@ -800,7 +802,7 @@ struct SuggestionStyleInvalid4 {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(parse_add_paren, code = "")]
+#[suggestion(no_crate_example, code = "")]
 //~^ ERROR suggestion without `#[primary_span]` field
 struct PrimarySpanOnVec {
     #[primary_span]
diff --git a/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.stderr b/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.stderr
index f9d1a63031d..343134af6bc 100644
--- a/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.stderr
+++ b/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.stderr
@@ -1,7 +1,7 @@
 error: label without `#[primary_span]` field
-  --> $DIR/subdiagnostic-derive.rs:47:1
+  --> $DIR/subdiagnostic-derive.rs:49:1
    |
-LL | / #[label(parse_add_paren)]
+LL | / #[label(no_crate_example)]
 LL | |
 LL | | struct C {
 LL | |     var: String,
@@ -9,141 +9,141 @@ LL | | }
    | |_^
 
 error: diagnostic slug must be first argument of a `#[label(...)]` attribute
-  --> $DIR/subdiagnostic-derive.rs:54:1
+  --> $DIR/subdiagnostic-derive.rs:56:1
    |
 LL | #[label]
    | ^^^^^^^^
 
 error: `#[foo]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:63:1
+  --> $DIR/subdiagnostic-derive.rs:65:1
    |
 LL | #[foo]
    | ^^^^^^
 
 error: `#[label = ...]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:73:1
+  --> $DIR/subdiagnostic-derive.rs:75:1
    |
 LL | #[label = "..."]
    | ^^^^^^^^^^^^^^^^
 
 error: `#[label(bug = ...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:82:9
+  --> $DIR/subdiagnostic-derive.rs:84:9
    |
 LL | #[label(bug = "...")]
    |         ^^^^^^^^^^^
 
 error: diagnostic slug must be first argument of a `#[label(...)]` attribute
-  --> $DIR/subdiagnostic-derive.rs:82:1
+  --> $DIR/subdiagnostic-derive.rs:84:1
    |
 LL | #[label(bug = "...")]
    | ^^^^^^^^^^^^^^^^^^^^^
 
 error: `#[label("...")]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:92:9
+  --> $DIR/subdiagnostic-derive.rs:94:9
    |
 LL | #[label("...")]
    |         ^^^^^
 
 error: diagnostic slug must be first argument of a `#[label(...)]` attribute
-  --> $DIR/subdiagnostic-derive.rs:92:1
+  --> $DIR/subdiagnostic-derive.rs:94:1
    |
 LL | #[label("...")]
    | ^^^^^^^^^^^^^^^
 
 error: `#[label(slug = ...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:102:9
+  --> $DIR/subdiagnostic-derive.rs:104:9
    |
 LL | #[label(slug = 4)]
    |         ^^^^^^^^
 
 error: diagnostic slug must be first argument of a `#[label(...)]` attribute
-  --> $DIR/subdiagnostic-derive.rs:102:1
+  --> $DIR/subdiagnostic-derive.rs:104:1
    |
 LL | #[label(slug = 4)]
    | ^^^^^^^^^^^^^^^^^^
 
 error: `#[label(slug(...))]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:112:9
+  --> $DIR/subdiagnostic-derive.rs:114:9
    |
 LL | #[label(slug("..."))]
    |         ^^^^^^^^^^^
 
 error: diagnostic slug must be first argument of a `#[label(...)]` attribute
-  --> $DIR/subdiagnostic-derive.rs:112:1
+  --> $DIR/subdiagnostic-derive.rs:114:1
    |
 LL | #[label(slug("..."))]
    | ^^^^^^^^^^^^^^^^^^^^^
 
 error: diagnostic slug must be first argument of a `#[label(...)]` attribute
-  --> $DIR/subdiagnostic-derive.rs:132:1
+  --> $DIR/subdiagnostic-derive.rs:134:1
    |
 LL | #[label()]
    | ^^^^^^^^^^
 
 error: `#[label(code = ...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:141:26
+  --> $DIR/subdiagnostic-derive.rs:143:27
    |
-LL | #[label(parse_add_paren, code = "...")]
-   |                          ^^^^^^^^^^^^
+LL | #[label(no_crate_example, code = "...")]
+   |                           ^^^^^^^^^^^^
 
 error: `#[label(applicability = ...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:150:26
+  --> $DIR/subdiagnostic-derive.rs:152:27
    |
-LL | #[label(parse_add_paren, applicability = "machine-applicable")]
-   |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[label(no_crate_example, applicability = "machine-applicable")]
+   |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: unsupported type attribute for subdiagnostic enum
-  --> $DIR/subdiagnostic-derive.rs:159:1
+  --> $DIR/subdiagnostic-derive.rs:161:1
    |
 LL | #[foo]
    | ^^^^^^
 
 error: `#[bar]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:173:5
+  --> $DIR/subdiagnostic-derive.rs:175:5
    |
 LL |     #[bar]
    |     ^^^^^^
 
 error: `#[bar = ...]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:185:5
+  --> $DIR/subdiagnostic-derive.rs:187:5
    |
 LL |     #[bar = "..."]
    |     ^^^^^^^^^^^^^^
 
 error: `#[bar = ...]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:197:5
+  --> $DIR/subdiagnostic-derive.rs:199:5
    |
 LL |     #[bar = 4]
    |     ^^^^^^^^^^
 
 error: `#[bar(...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:209:5
+  --> $DIR/subdiagnostic-derive.rs:211:5
    |
 LL |     #[bar("...")]
    |     ^^^^^^^^^^^^^
 
 error: `#[label(code = ...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:221:13
+  --> $DIR/subdiagnostic-derive.rs:223:13
    |
 LL |     #[label(code = "...")]
    |             ^^^^^^^^^^^^
 
 error: diagnostic slug must be first argument of a `#[label(...)]` attribute
-  --> $DIR/subdiagnostic-derive.rs:221:5
+  --> $DIR/subdiagnostic-derive.rs:223:5
    |
 LL |     #[label(code = "...")]
    |     ^^^^^^^^^^^^^^^^^^^^^^
 
 error: the `#[primary_span]` attribute can only be applied to fields of type `Span` or `MultiSpan`
-  --> $DIR/subdiagnostic-derive.rs:250:5
+  --> $DIR/subdiagnostic-derive.rs:252:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
 
 error: label without `#[primary_span]` field
-  --> $DIR/subdiagnostic-derive.rs:247:1
+  --> $DIR/subdiagnostic-derive.rs:249:1
    |
-LL | / #[label(parse_add_paren)]
+LL | / #[label(no_crate_example)]
 LL | |
 LL | | struct W {
 LL | |     #[primary_span]
@@ -153,13 +153,13 @@ LL | | }
    | |_^
 
 error: `#[applicability]` is only valid on suggestions
-  --> $DIR/subdiagnostic-derive.rs:260:5
+  --> $DIR/subdiagnostic-derive.rs:262:5
    |
 LL |     #[applicability]
    |     ^^^^^^^^^^^^^^^^
 
 error: `#[bar]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:270:5
+  --> $DIR/subdiagnostic-derive.rs:272:5
    |
 LL |     #[bar]
    |     ^^^^^^
@@ -167,13 +167,13 @@ LL |     #[bar]
    = help: only `primary_span`, `applicability` and `skip_arg` are valid field attributes
 
 error: `#[bar = ...]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:281:5
+  --> $DIR/subdiagnostic-derive.rs:283:5
    |
 LL |     #[bar = "..."]
    |     ^^^^^^^^^^^^^^
 
 error: `#[bar(...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:292:5
+  --> $DIR/subdiagnostic-derive.rs:294:5
    |
 LL |     #[bar("...")]
    |     ^^^^^^^^^^^^^
@@ -181,7 +181,7 @@ LL |     #[bar("...")]
    = help: only `primary_span`, `applicability` and `skip_arg` are valid field attributes
 
 error: unexpected unsupported untagged union
-  --> $DIR/subdiagnostic-derive.rs:308:1
+  --> $DIR/subdiagnostic-derive.rs:310:1
    |
 LL | / union AC {
 LL | |
@@ -190,78 +190,78 @@ LL | |     b: u64,
 LL | | }
    | |_^
 
-error: `#[label(parse_add_paren)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:323:26
+error: `#[label(no_crate::example)]` is not a valid attribute
+  --> $DIR/subdiagnostic-derive.rs:325:27
    |
-LL | #[label(parse_add_paren, parse_add_paren)]
-   |                          ^^^^^^^^^^^^^^^
+LL | #[label(no_crate_example, no_crate::example)]
+   |                           ^^^^^^^^^^^^^^^^^
    |
    = help: a diagnostic slug must be the first argument to the attribute
 
 error: specified multiple times
-  --> $DIR/subdiagnostic-derive.rs:336:5
+  --> $DIR/subdiagnostic-derive.rs:338:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/subdiagnostic-derive.rs:333:5
+  --> $DIR/subdiagnostic-derive.rs:335:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
 
 error: subdiagnostic kind not specified
-  --> $DIR/subdiagnostic-derive.rs:342:8
+  --> $DIR/subdiagnostic-derive.rs:344:8
    |
 LL | struct AG {
    |        ^^
 
 error: specified multiple times
-  --> $DIR/subdiagnostic-derive.rs:379:45
+  --> $DIR/subdiagnostic-derive.rs:381:46
    |
-LL | #[suggestion(parse_add_paren, code = "...", code = "...")]
-   |                                             ^^^^^^^^^^^^
+LL | #[suggestion(no_crate_example, code = "...", code = "...")]
+   |                                              ^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/subdiagnostic-derive.rs:379:31
+  --> $DIR/subdiagnostic-derive.rs:381:32
    |
-LL | #[suggestion(parse_add_paren, code = "...", code = "...")]
-   |                               ^^^^^^^^^^^^
+LL | #[suggestion(no_crate_example, code = "...", code = "...")]
+   |                                ^^^^^^^^^^^^
 
 error: specified multiple times
-  --> $DIR/subdiagnostic-derive.rs:397:5
+  --> $DIR/subdiagnostic-derive.rs:399:5
    |
 LL |     #[applicability]
    |     ^^^^^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/subdiagnostic-derive.rs:394:5
+  --> $DIR/subdiagnostic-derive.rs:396:5
    |
 LL |     #[applicability]
    |     ^^^^^^^^^^^^^^^^
 
 error: the `#[applicability]` attribute can only be applied to fields of type `Applicability`
-  --> $DIR/subdiagnostic-derive.rs:407:5
+  --> $DIR/subdiagnostic-derive.rs:409:5
    |
 LL |     #[applicability]
    |     ^^^^^^^^^^^^^^^^
 
 error: suggestion without `code = "..."`
-  --> $DIR/subdiagnostic-derive.rs:420:1
+  --> $DIR/subdiagnostic-derive.rs:422:1
    |
-LL | #[suggestion(parse_add_paren)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[suggestion(no_crate_example)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: invalid applicability
-  --> $DIR/subdiagnostic-derive.rs:430:45
+  --> $DIR/subdiagnostic-derive.rs:432:46
    |
-LL | #[suggestion(parse_add_paren, code = "...", applicability = "foo")]
-   |                                             ^^^^^^^^^^^^^^^^^^^^^
+LL | #[suggestion(no_crate_example, code = "...", applicability = "foo")]
+   |                                              ^^^^^^^^^^^^^^^^^^^^^
 
 error: suggestion without `#[primary_span]` field
-  --> $DIR/subdiagnostic-derive.rs:448:1
+  --> $DIR/subdiagnostic-derive.rs:450:1
    |
-LL | / #[suggestion(parse_add_paren, code = "...")]
+LL | / #[suggestion(no_crate_example, code = "...")]
 LL | |
 LL | | struct AR {
 LL | |     var: String,
@@ -269,25 +269,25 @@ LL | | }
    | |_^
 
 error: unsupported type attribute for subdiagnostic enum
-  --> $DIR/subdiagnostic-derive.rs:462:1
+  --> $DIR/subdiagnostic-derive.rs:464:1
    |
 LL | #[label]
    | ^^^^^^^^
 
 error: `var` doesn't refer to a field on this type
-  --> $DIR/subdiagnostic-derive.rs:482:38
+  --> $DIR/subdiagnostic-derive.rs:484:39
    |
-LL | #[suggestion(parse_add_paren, code = "{var}", applicability = "machine-applicable")]
-   |                                      ^^^^^^^
+LL | #[suggestion(no_crate_example, code = "{var}", applicability = "machine-applicable")]
+   |                                       ^^^^^^^
 
 error: `var` doesn't refer to a field on this type
-  --> $DIR/subdiagnostic-derive.rs:501:42
+  --> $DIR/subdiagnostic-derive.rs:503:43
    |
-LL |     #[suggestion(parse_add_paren, code = "{var}", applicability = "machine-applicable")]
-   |                                          ^^^^^^^
+LL |     #[suggestion(no_crate_example, code = "{var}", applicability = "machine-applicable")]
+   |                                           ^^^^^^^
 
 error: `#[suggestion_part]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:524:5
+  --> $DIR/subdiagnostic-derive.rs:526:5
    |
 LL |     #[suggestion_part]
    |     ^^^^^^^^^^^^^^^^^^
@@ -295,7 +295,7 @@ LL |     #[suggestion_part]
    = help: `#[suggestion_part(...)]` is only valid in multipart suggestions, use `#[primary_span]` instead
 
 error: `#[suggestion_part(...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:527:5
+  --> $DIR/subdiagnostic-derive.rs:529:5
    |
 LL |     #[suggestion_part(code = "...")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -303,9 +303,9 @@ LL |     #[suggestion_part(code = "...")]
    = help: `#[suggestion_part(...)]` is only valid in multipart suggestions
 
 error: suggestion without `#[primary_span]` field
-  --> $DIR/subdiagnostic-derive.rs:521:1
+  --> $DIR/subdiagnostic-derive.rs:523:1
    |
-LL | / #[suggestion(parse_add_paren, code = "...")]
+LL | / #[suggestion(no_crate_example, code = "...")]
 LL | |
 LL | | struct BA {
 LL | |     #[suggestion_part]
@@ -315,17 +315,17 @@ LL | | }
    | |_^
 
 error: `#[multipart_suggestion(code = ...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:536:41
+  --> $DIR/subdiagnostic-derive.rs:538:42
    |
-LL | #[multipart_suggestion(parse_add_paren, code = "...", applicability = "machine-applicable")]
-   |                                         ^^^^^^^^^^^^
+LL | #[multipart_suggestion(no_crate_example, code = "...", applicability = "machine-applicable")]
+   |                                          ^^^^^^^^^^^^
    |
    = help: only `style` and `applicability` are valid nested attributes
 
 error: multipart suggestion without any `#[suggestion_part(...)]` fields
-  --> $DIR/subdiagnostic-derive.rs:536:1
+  --> $DIR/subdiagnostic-derive.rs:538:1
    |
-LL | / #[multipart_suggestion(parse_add_paren, code = "...", applicability = "machine-applicable")]
+LL | / #[multipart_suggestion(no_crate_example, code = "...", applicability = "machine-applicable")]
 LL | |
 LL | |
 LL | | struct BBa {
@@ -334,19 +334,19 @@ LL | | }
    | |_^
 
 error: `#[suggestion_part(...)]` attribute without `code = "..."`
-  --> $DIR/subdiagnostic-derive.rs:546:5
+  --> $DIR/subdiagnostic-derive.rs:548:5
    |
 LL |     #[suggestion_part]
    |     ^^^^^^^^^^^^^^^^^^
 
 error: `#[suggestion_part(...)]` attribute without `code = "..."`
-  --> $DIR/subdiagnostic-derive.rs:554:5
+  --> $DIR/subdiagnostic-derive.rs:556:5
    |
 LL |     #[suggestion_part()]
    |     ^^^^^^^^^^^^^^^^^^^^
 
 error: `#[primary_span]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:563:5
+  --> $DIR/subdiagnostic-derive.rs:565:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
@@ -354,9 +354,9 @@ LL |     #[primary_span]
    = help: multipart suggestions use one or more `#[suggestion_part]`s rather than one `#[primary_span]`
 
 error: multipart suggestion without any `#[suggestion_part(...)]` fields
-  --> $DIR/subdiagnostic-derive.rs:560:1
+  --> $DIR/subdiagnostic-derive.rs:562:1
    |
-LL | / #[multipart_suggestion(parse_add_paren)]
+LL | / #[multipart_suggestion(no_crate_example)]
 LL | |
 LL | | struct BC {
 LL | |     #[primary_span]
@@ -366,19 +366,19 @@ LL | | }
    | |_^
 
 error: `#[suggestion_part(...)]` attribute without `code = "..."`
-  --> $DIR/subdiagnostic-derive.rs:571:5
+  --> $DIR/subdiagnostic-derive.rs:573:5
    |
 LL |     #[suggestion_part]
    |     ^^^^^^^^^^^^^^^^^^
 
 error: `#[suggestion_part(...)]` attribute without `code = "..."`
-  --> $DIR/subdiagnostic-derive.rs:574:5
+  --> $DIR/subdiagnostic-derive.rs:576:5
    |
 LL |     #[suggestion_part()]
    |     ^^^^^^^^^^^^^^^^^^^^
 
 error: `#[suggestion_part(foo = ...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:577:23
+  --> $DIR/subdiagnostic-derive.rs:579:23
    |
 LL |     #[suggestion_part(foo = "bar")]
    |                       ^^^^^^^^^^^
@@ -386,123 +386,123 @@ LL |     #[suggestion_part(foo = "bar")]
    = help: `code` is the only valid nested attribute
 
 error: the `#[suggestion_part(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan`
-  --> $DIR/subdiagnostic-derive.rs:580:5
+  --> $DIR/subdiagnostic-derive.rs:582:5
    |
 LL |     #[suggestion_part(code = "...")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: the `#[suggestion_part(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan`
-  --> $DIR/subdiagnostic-derive.rs:583:5
+  --> $DIR/subdiagnostic-derive.rs:585:5
    |
 LL |     #[suggestion_part()]
    |     ^^^^^^^^^^^^^^^^^^^^
 
 error: specified multiple times
-  --> $DIR/subdiagnostic-derive.rs:591:37
+  --> $DIR/subdiagnostic-derive.rs:593:37
    |
 LL |     #[suggestion_part(code = "...", code = ",,,")]
    |                                     ^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/subdiagnostic-derive.rs:591:23
+  --> $DIR/subdiagnostic-derive.rs:593:23
    |
 LL |     #[suggestion_part(code = "...", code = ",,,")]
    |                       ^^^^^^^^^^^^
 
 error: `#[applicability]` has no effect if all `#[suggestion]`/`#[multipart_suggestion]` attributes have a static `applicability = "..."`
-  --> $DIR/subdiagnostic-derive.rs:620:5
+  --> $DIR/subdiagnostic-derive.rs:622:5
    |
 LL |     #[applicability]
    |     ^^^^^^^^^^^^^^^^
 
 error: expected exactly one string literal for `code = ...`
-  --> $DIR/subdiagnostic-derive.rs:668:23
+  --> $DIR/subdiagnostic-derive.rs:670:23
    |
 LL |     #[suggestion_part(code("foo"))]
    |                       ^^^^^^^^^^^
 
 error: expected exactly one string literal for `code = ...`
-  --> $DIR/subdiagnostic-derive.rs:677:23
+  --> $DIR/subdiagnostic-derive.rs:679:23
    |
 LL |     #[suggestion_part(code("foo", "bar"))]
    |                       ^^^^^^^^^^^^^^^^^^
 
 error: expected exactly one string literal for `code = ...`
-  --> $DIR/subdiagnostic-derive.rs:686:23
+  --> $DIR/subdiagnostic-derive.rs:688:23
    |
 LL |     #[suggestion_part(code(3))]
    |                       ^^^^^^^
 
 error: expected exactly one string literal for `code = ...`
-  --> $DIR/subdiagnostic-derive.rs:695:23
+  --> $DIR/subdiagnostic-derive.rs:697:23
    |
 LL |     #[suggestion_part(code())]
    |                       ^^^^^^
 
 error: `code = "..."`/`code(...)` must contain only string literals
-  --> $DIR/subdiagnostic-derive.rs:704:23
+  --> $DIR/subdiagnostic-derive.rs:706:23
    |
 LL |     #[suggestion_part(code = 3)]
    |                       ^^^^^^^^
 
 error: specified multiple times
-  --> $DIR/subdiagnostic-derive.rs:746:60
+  --> $DIR/subdiagnostic-derive.rs:748:61
    |
-LL | #[suggestion(parse_add_paren, code = "", style = "hidden", style = "normal")]
-   |                                                            ^^^^^^^^^^^^^^^^
+LL | #[suggestion(no_crate_example, code = "", style = "hidden", style = "normal")]
+   |                                                             ^^^^^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/subdiagnostic-derive.rs:746:42
+  --> $DIR/subdiagnostic-derive.rs:748:43
    |
-LL | #[suggestion(parse_add_paren, code = "", style = "hidden", style = "normal")]
-   |                                          ^^^^^^^^^^^^^^^^
+LL | #[suggestion(no_crate_example, code = "", style = "hidden", style = "normal")]
+   |                                           ^^^^^^^^^^^^^^^^
 
 error: `#[suggestion_hidden(...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:755:1
+  --> $DIR/subdiagnostic-derive.rs:757:1
    |
-LL | #[suggestion_hidden(parse_add_paren, code = "")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[suggestion_hidden(no_crate_example, code = "")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: Use `#[suggestion(..., style = "hidden")]` instead
 
 error: `#[suggestion_hidden(...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:763:1
+  --> $DIR/subdiagnostic-derive.rs:765:1
    |
-LL | #[suggestion_hidden(parse_add_paren, code = "", style = "normal")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[suggestion_hidden(no_crate_example, code = "", style = "normal")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: Use `#[suggestion(..., style = "hidden")]` instead
 
 error: invalid suggestion style
-  --> $DIR/subdiagnostic-derive.rs:771:50
+  --> $DIR/subdiagnostic-derive.rs:773:51
    |
-LL | #[suggestion(parse_add_paren, code = "", style = "foo")]
-   |                                                  ^^^^^
+LL | #[suggestion(no_crate_example, code = "", style = "foo")]
+   |                                                   ^^^^^
    |
    = help: valid styles are `normal`, `short`, `hidden`, `verbose` and `tool-only`
 
 error: `#[suggestion(style = ...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:779:42
+  --> $DIR/subdiagnostic-derive.rs:781:43
    |
-LL | #[suggestion(parse_add_paren, code = "", style = 42)]
-   |                                          ^^^^^^^^^^
+LL | #[suggestion(no_crate_example, code = "", style = 42)]
+   |                                           ^^^^^^^^^^
 
 error: `#[suggestion(style)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:787:42
+  --> $DIR/subdiagnostic-derive.rs:789:43
    |
-LL | #[suggestion(parse_add_paren, code = "", style)]
-   |                                          ^^^^^
+LL | #[suggestion(no_crate_example, code = "", style)]
+   |                                           ^^^^^
    |
    = help: a diagnostic slug must be the first argument to the attribute
 
 error: `#[suggestion(style(...))]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:795:42
+  --> $DIR/subdiagnostic-derive.rs:797:43
    |
-LL | #[suggestion(parse_add_paren, code = "", style("foo"))]
-   |                                          ^^^^^^^^^^^^
+LL | #[suggestion(no_crate_example, code = "", style("foo"))]
+   |                                           ^^^^^^^^^^^^
 
 error: `#[primary_span]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:806:5
+  --> $DIR/subdiagnostic-derive.rs:808:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
@@ -511,9 +511,9 @@ LL |     #[primary_span]
    = help: to create a suggestion with multiple spans, use `#[multipart_suggestion]` instead
 
 error: suggestion without `#[primary_span]` field
-  --> $DIR/subdiagnostic-derive.rs:803:1
+  --> $DIR/subdiagnostic-derive.rs:805:1
    |
-LL | / #[suggestion(parse_add_paren, code = "")]
+LL | / #[suggestion(no_crate_example, code = "")]
 LL | |
 LL | | struct PrimarySpanOnVec {
 LL | |     #[primary_span]
@@ -523,64 +523,64 @@ LL | | }
    | |_^
 
 error: cannot find attribute `foo` in this scope
-  --> $DIR/subdiagnostic-derive.rs:63:3
+  --> $DIR/subdiagnostic-derive.rs:65:3
    |
 LL | #[foo]
    |   ^^^
 
 error: cannot find attribute `foo` in this scope
-  --> $DIR/subdiagnostic-derive.rs:159:3
+  --> $DIR/subdiagnostic-derive.rs:161:3
    |
 LL | #[foo]
    |   ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:173:7
+  --> $DIR/subdiagnostic-derive.rs:175:7
    |
 LL |     #[bar]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:185:7
+  --> $DIR/subdiagnostic-derive.rs:187:7
    |
 LL |     #[bar = "..."]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:197:7
+  --> $DIR/subdiagnostic-derive.rs:199:7
    |
 LL |     #[bar = 4]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:209:7
+  --> $DIR/subdiagnostic-derive.rs:211:7
    |
 LL |     #[bar("...")]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:270:7
+  --> $DIR/subdiagnostic-derive.rs:272:7
    |
 LL |     #[bar]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:281:7
+  --> $DIR/subdiagnostic-derive.rs:283:7
    |
 LL |     #[bar = "..."]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:292:7
+  --> $DIR/subdiagnostic-derive.rs:294:7
    |
 LL |     #[bar("...")]
    |       ^^^
 
-error[E0425]: cannot find value `slug` in module `rustc_errors::fluent`
-  --> $DIR/subdiagnostic-derive.rs:122:9
+error[E0425]: cannot find value `slug` in module `crate::fluent_generated`
+  --> $DIR/subdiagnostic-derive.rs:124:9
    |
 LL | #[label(slug)]
-   |         ^^^^ not found in `rustc_errors::fluent`
+   |         ^^^^ not found in `crate::fluent_generated`
 
 error: aborting due to 81 previous errors
 
-- 
cgit 1.4.1-3-g733a5


From 26255186e2e94e0fe62cfd0965662494b6aab27c Mon Sep 17 00:00:00 2001
From: David Wood <david.wood@huawei.com>
Date: Mon, 17 Oct 2022 14:11:26 +0100
Subject: various: translation resources from cg backend

Extend `CodegenBackend` trait with a function returning the translation
resources from the codegen backend, which can be added to the complete
list of resources provided to the emitter.

Signed-off-by: David Wood <david.wood@huawei.com>
---
 compiler/rustc_codegen_cranelift/src/lib.rs            |  5 +++++
 compiler/rustc_codegen_gcc/src/lib.rs                  |  4 ++++
 compiler/rustc_codegen_llvm/src/lib.rs                 |  4 ++++
 compiler/rustc_codegen_ssa/src/traits/backend.rs       |  4 ++++
 compiler/rustc_driver_impl/src/lib.rs                  |  4 ++--
 compiler/rustc_error_messages/src/lib.rs               |  2 +-
 compiler/rustc_errors/src/json/tests.rs                |  4 ++--
 compiler/rustc_expand/src/parse/tests.rs               |  8 ++++----
 compiler/rustc_expand/src/tests.rs                     | 18 ++++++++++++------
 compiler/rustc_interface/src/tests.rs                  |  2 +-
 compiler/rustc_interface/src/util.rs                   |  3 +++
 compiler/rustc_session/src/parse.rs                    |  7 ++-----
 compiler/rustc_session/src/session.rs                  | 12 +++++-------
 src/librustdoc/clean/render_macro_matchers.rs          |  3 ++-
 src/librustdoc/core.rs                                 |  6 ++++--
 src/librustdoc/doctest.rs                              | 12 ++++++++----
 src/librustdoc/passes/lint/check_code_block_syntax.rs  |  6 ++++--
 src/tools/clippy/clippy_lints/src/doc.rs               |  6 ++++--
 src/tools/clippy/src/driver.rs                         |  5 ++++-
 src/tools/rustfmt/src/parse/session.rs                 |  6 ++++--
 .../hotplug_codegen_backend/the_backend.rs             |  2 ++
 tests/ui-fulldeps/mod_dir_path_canonicalized.rs        |  7 ++++---
 tests/ui-fulldeps/pprust-expr-roundtrip.rs             |  4 +---
 23 files changed, 86 insertions(+), 48 deletions(-)

(limited to 'compiler/rustc_interface/src')

diff --git a/compiler/rustc_codegen_cranelift/src/lib.rs b/compiler/rustc_codegen_cranelift/src/lib.rs
index c7fe382bac4..5ba568bfd6e 100644
--- a/compiler/rustc_codegen_cranelift/src/lib.rs
+++ b/compiler/rustc_codegen_cranelift/src/lib.rs
@@ -172,6 +172,11 @@ pub struct CraneliftCodegenBackend {
 }
 
 impl CodegenBackend for CraneliftCodegenBackend {
+    fn locale_resource(&self) -> &'static str {
+        // FIXME(rust-lang/rust#100717) - cranelift codegen backend is not yet translated
+        ""
+    }
+
     fn init(&self, sess: &Session) {
         use rustc_session::config::Lto;
         match sess.lto() {
diff --git a/compiler/rustc_codegen_gcc/src/lib.rs b/compiler/rustc_codegen_gcc/src/lib.rs
index 546c892aae5..44538b41528 100644
--- a/compiler/rustc_codegen_gcc/src/lib.rs
+++ b/compiler/rustc_codegen_gcc/src/lib.rs
@@ -103,6 +103,10 @@ pub struct GccCodegenBackend {
 }
 
 impl CodegenBackend for GccCodegenBackend {
+    fn locale_resource(&self) -> &'static str {
+        crate::DEFAULT_LOCALE_RESOURCE
+    }
+
     fn init(&self, sess: &Session) {
         if sess.lto() != Lto::No {
             sess.emit_warning(LTONotSupported {});
diff --git a/compiler/rustc_codegen_llvm/src/lib.rs b/compiler/rustc_codegen_llvm/src/lib.rs
index de886c881a5..c41e74c51a0 100644
--- a/compiler/rustc_codegen_llvm/src/lib.rs
+++ b/compiler/rustc_codegen_llvm/src/lib.rs
@@ -249,6 +249,10 @@ impl LlvmCodegenBackend {
 }
 
 impl CodegenBackend for LlvmCodegenBackend {
+    fn locale_resource(&self) -> &'static str {
+        crate::DEFAULT_LOCALE_RESOURCE
+    }
+
     fn init(&self, sess: &Session) {
         llvm_util::init(sess); // Make sure llvm is inited
     }
diff --git a/compiler/rustc_codegen_ssa/src/traits/backend.rs b/compiler/rustc_codegen_ssa/src/traits/backend.rs
index 5c35070ea66..64bebe50ddb 100644
--- a/compiler/rustc_codegen_ssa/src/traits/backend.rs
+++ b/compiler/rustc_codegen_ssa/src/traits/backend.rs
@@ -57,6 +57,10 @@ impl<'tcx, T> Backend<'tcx> for T where
 }
 
 pub trait CodegenBackend {
+    /// Locale resources for diagnostic messages - a string the content of the Fluent resource.
+    /// Called before `init` so that all other functions are able to emit translatable diagnostics.
+    fn locale_resource(&self) -> &'static str;
+
     fn init(&self, _sess: &Session) {}
     fn print(&self, _req: PrintRequest, _sess: &Session) {}
     fn target_features(&self, _sess: &Session, _allow_unstable: bool) -> Vec<Symbol> {
diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index f696cc20e23..54bcb154da2 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -362,7 +362,7 @@ fn run_compiler(
             }
 
             // Make sure name resolution and macro expansion is run.
-            queries.global_ctxt()?;
+            queries.global_ctxt()?.enter(|tcx| tcx.resolver_for_lowering(()));
 
             if callbacks.after_expansion(compiler, queries) == Compilation::Stop {
                 return early_exit();
@@ -1204,7 +1204,7 @@ static DEFAULT_HOOK: LazyLock<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send +
 /// hook.
 pub fn report_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
     let fallback_bundle =
-        rustc_errors::fallback_fluent_bundle(crate::DEFAULT_LOCALE_RESOURCES, false);
+        rustc_errors::fallback_fluent_bundle(crate::DEFAULT_LOCALE_RESOURCES.to_vec(), false);
     let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
         rustc_errors::ColorConfig::Auto,
         None,
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
index 13952f8456e..40ed10e7165 100644
--- a/compiler/rustc_error_messages/src/lib.rs
+++ b/compiler/rustc_error_messages/src/lib.rs
@@ -223,7 +223,7 @@ pub type LazyFallbackBundle = Lrc<Lazy<FluentBundle, impl FnOnce() -> FluentBund
 /// Return the default `FluentBundle` with standard "en-US" diagnostic messages.
 #[instrument(level = "trace")]
 pub fn fallback_fluent_bundle(
-    resources: &'static [&'static str],
+    resources: Vec<&'static str>,
     with_directionality_markers: bool,
 ) -> LazyFallbackBundle {
     Lrc::new(Lazy::new(move || {
diff --git a/compiler/rustc_errors/src/json/tests.rs b/compiler/rustc_errors/src/json/tests.rs
index bbfad26c6f0..671dc449eaa 100644
--- a/compiler/rustc_errors/src/json/tests.rs
+++ b/compiler/rustc_errors/src/json/tests.rs
@@ -42,11 +42,11 @@ impl<T: Write> Write for Shared<T> {
 
 /// Test the span yields correct positions in JSON.
 fn test_positions(code: &str, span: (u32, u32), expected_output: SpanTestData) {
-    static TEST_LOCALE_RESOURCES: &[&str] = &[crate::DEFAULT_LOCALE_RESOURCE];
     rustc_span::create_default_session_globals_then(|| {
         let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         sm.new_source_file(Path::new("test.rs").to_owned().into(), code.to_owned());
-        let fallback_bundle = crate::fallback_fluent_bundle(TEST_LOCALE_RESOURCES, false);
+        let fallback_bundle =
+            crate::fallback_fluent_bundle(vec![crate::DEFAULT_LOCALE_RESOURCE], false);
 
         let output = Arc::new(Mutex::new(Vec::new()));
         let je = JsonEmitter::new(
diff --git a/compiler/rustc_expand/src/parse/tests.rs b/compiler/rustc_expand/src/parse/tests.rs
index a416300ba7e..8b37728b60f 100644
--- a/compiler/rustc_expand/src/parse/tests.rs
+++ b/compiler/rustc_expand/src/parse/tests.rs
@@ -17,11 +17,11 @@ use rustc_span::{BytePos, FileName, Pos, Span};
 
 use std::path::PathBuf;
 
-static TEST_LOCALE_RESOURCES: &[&str] =
-    &[crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE];
-
 fn sess() -> ParseSess {
-    ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty())
+    ParseSess::new(
+        vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
+        FilePathMapping::empty(),
+    )
 }
 
 /// Parses an item.
diff --git a/compiler/rustc_expand/src/tests.rs b/compiler/rustc_expand/src/tests.rs
index bd1b3ff28b7..14918d3c190 100644
--- a/compiler/rustc_expand/src/tests.rs
+++ b/compiler/rustc_expand/src/tests.rs
@@ -34,7 +34,10 @@ where
 
 /// Maps a string to tts, using a made-up filename.
 pub(crate) fn string_to_stream(source_str: String) -> TokenStream {
-    let ps = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
+    let ps = ParseSess::new(
+        vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
+        FilePathMapping::empty(),
+    );
     source_file_to_stream(
         &ps,
         ps.source_map().new_source_file(PathBuf::from("bogofile").into(), source_str),
@@ -45,7 +48,10 @@ pub(crate) fn string_to_stream(source_str: String) -> TokenStream {
 
 /// Parses a string, returns a crate.
 pub(crate) fn string_to_crate(source_str: String) -> ast::Crate {
-    let ps = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
+    let ps = ParseSess::new(
+        vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
+        FilePathMapping::empty(),
+    );
     with_error_checking_parse(source_str, &ps, |p| p.parse_crate_mod())
 }
 
@@ -123,14 +129,14 @@ impl<T: Write> Write for Shared<T> {
     }
 }
 
-static TEST_LOCALE_RESOURCES: &[&str] =
-    &[crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE];
-
 fn test_harness(file_text: &str, span_labels: Vec<SpanLabel>, expected_output: &str) {
     create_default_session_if_not_set_then(|_| {
         let output = Arc::new(Mutex::new(Vec::new()));
 
-        let fallback_bundle = rustc_errors::fallback_fluent_bundle(TEST_LOCALE_RESOURCES, false);
+        let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+            vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
+            false,
+        );
         let source_map = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         source_map.new_source_file(Path::new("test.rs").to_owned().into(), file_text.to_owned());
 
diff --git a/compiler/rustc_interface/src/tests.rs b/compiler/rustc_interface/src/tests.rs
index 8ef1df39933..71a72036994 100644
--- a/compiler/rustc_interface/src/tests.rs
+++ b/compiler/rustc_interface/src/tests.rs
@@ -50,7 +50,7 @@ fn mk_session(matches: getopts::Matches) -> (Session, CfgSpecs) {
         output_file: None,
         temps_dir,
     };
-    let sess = build_session(sessopts, io, None, registry, &[], Default::default(), None, None);
+    let sess = build_session(sessopts, io, None, registry, vec![], Default::default(), None, None);
     (sess, cfg)
 }
 
diff --git a/compiler/rustc_interface/src/util.rs b/compiler/rustc_interface/src/util.rs
index 20ba5c6eb2d..e5d2fb2ea28 100644
--- a/compiler/rustc_interface/src/util.rs
+++ b/compiler/rustc_interface/src/util.rs
@@ -90,6 +90,9 @@ pub fn create_session(
         }
     };
 
+    let mut locale_resources = Vec::from(locale_resources);
+    locale_resources.push(codegen_backend.locale_resource());
+
     let mut sess = session::build_session(
         sopts,
         io,
diff --git a/compiler/rustc_session/src/parse.rs b/compiler/rustc_session/src/parse.rs
index 9d0ef9f2f12..4e8c3f73e29 100644
--- a/compiler/rustc_session/src/parse.rs
+++ b/compiler/rustc_session/src/parse.rs
@@ -226,10 +226,7 @@ pub struct ParseSess {
 
 impl ParseSess {
     /// Used for testing.
-    pub fn new(
-        locale_resources: &'static [&'static str],
-        file_path_mapping: FilePathMapping,
-    ) -> Self {
+    pub fn new(locale_resources: Vec<&'static str>, file_path_mapping: FilePathMapping) -> Self {
         let fallback_bundle = fallback_fluent_bundle(locale_resources, false);
         let sm = Lrc::new(SourceMap::new(file_path_mapping));
         let handler = Handler::with_tty_emitter(
@@ -268,7 +265,7 @@ impl ParseSess {
     }
 
     pub fn with_silent_emitter(fatal_note: Option<String>) -> Self {
-        let fallback_bundle = fallback_fluent_bundle(&[], false);
+        let fallback_bundle = fallback_fluent_bundle(Vec::new(), false);
         let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         let fatal_handler =
             Handler::with_tty_emitter(ColorConfig::Auto, false, None, None, None, fallback_bundle);
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index 0be057de6d7..446ba63ed1c 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -1341,7 +1341,7 @@ pub fn build_session(
     io: CompilerIO,
     bundle: Option<Lrc<rustc_errors::FluentBundle>>,
     registry: rustc_errors::registry::Registry,
-    fluent_resources: &'static [&'static str],
+    fluent_resources: Vec<&'static str>,
     driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
     file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
     target_override: Option<Target>,
@@ -1630,13 +1630,11 @@ pub enum IncrCompSession {
     InvalidBecauseOfErrors { session_directory: PathBuf },
 }
 
-// FIXME(#100717): early errors aren't translated at the moment, so this is fine, but it will need
-// to reference every crate that might emit an early error for translation to work.
-static EARLY_ERROR_LOCALE_RESOURCE: &'static [&'static str] =
-    &[rustc_errors::DEFAULT_LOCALE_RESOURCE];
-
 fn early_error_handler(output: config::ErrorOutputType) -> rustc_errors::Handler {
-    let fallback_bundle = fallback_fluent_bundle(EARLY_ERROR_LOCALE_RESOURCE, false);
+    // FIXME(#100717): early errors aren't translated at the moment, so this is fine, but it will
+    // need to reference every crate that might emit an early error for translation to work.
+    let fallback_bundle =
+        fallback_fluent_bundle(vec![rustc_errors::DEFAULT_LOCALE_RESOURCE], false);
     let emitter: Box<dyn Emitter + sync::Send> = match output {
         config::ErrorOutputType::HumanReadable(kind) => {
             let (short, color_config) = kind.unzip();
diff --git a/src/librustdoc/clean/render_macro_matchers.rs b/src/librustdoc/clean/render_macro_matchers.rs
index 068d596f52f..ef38ca3c16c 100644
--- a/src/librustdoc/clean/render_macro_matchers.rs
+++ b/src/librustdoc/clean/render_macro_matchers.rs
@@ -63,7 +63,8 @@ fn snippet_equal_to_token(tcx: TyCtxt<'_>, matcher: &TokenTree) -> Option<String
     let snippet = source_map.span_to_snippet(span).ok()?;
 
     // Create a Parser.
-    let sess = ParseSess::new(rustc_driver::DEFAULT_LOCALE_RESOURCES, FilePathMapping::empty());
+    let sess =
+        ParseSess::new(rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(), FilePathMapping::empty());
     let file_name = source_map.span_to_filename(span);
     let mut parser =
         match rustc_parse::maybe_new_parser_from_source_str(&sess, file_name, snippet.clone()) {
diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
index cb0feed08a0..fbfc58a436b 100644
--- a/src/librustdoc/core.rs
+++ b/src/librustdoc/core.rs
@@ -115,8 +115,10 @@ pub(crate) fn new_handler(
     diagnostic_width: Option<usize>,
     unstable_opts: &UnstableOptions,
 ) -> rustc_errors::Handler {
-    let fallback_bundle =
-        rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+    let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+        rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+        false,
+    );
     let emitter: Box<dyn Emitter + sync::Send> = match error_format {
         ErrorOutputType::HumanReadable(kind) => {
             let (short, color_config) = kind.unzip();
diff --git a/src/librustdoc/doctest.rs b/src/librustdoc/doctest.rs
index 509240a5194..8a73d25d3f0 100644
--- a/src/librustdoc/doctest.rs
+++ b/src/librustdoc/doctest.rs
@@ -546,8 +546,10 @@ pub(crate) fn make_test(
             // Any errors in parsing should also appear when the doctest is compiled for real, so just
             // send all the errors that librustc_ast emits directly into a `Sink` instead of stderr.
             let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-            let fallback_bundle =
-                rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+            let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+                rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+                false,
+            );
             supports_color = EmitterWriter::stderr(
                 ColorConfig::Auto,
                 None,
@@ -742,8 +744,10 @@ fn check_if_attr_is_complete(source: &str, edition: Edition) -> bool {
             // Any errors in parsing should also appear when the doctest is compiled for real, so just
             // send all the errors that librustc_ast emits directly into a `Sink` instead of stderr.
             let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-            let fallback_bundle =
-                rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+            let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+                rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+                false,
+            );
 
             let emitter = EmitterWriter::new(
                 Box::new(io::sink()),
diff --git a/src/librustdoc/passes/lint/check_code_block_syntax.rs b/src/librustdoc/passes/lint/check_code_block_syntax.rs
index 71f922662da..26fbb03a43e 100644
--- a/src/librustdoc/passes/lint/check_code_block_syntax.rs
+++ b/src/librustdoc/passes/lint/check_code_block_syntax.rs
@@ -33,8 +33,10 @@ fn check_rust_syntax(
     code_block: RustCodeBlock,
 ) {
     let buffer = Lrc::new(Lock::new(Buffer::default()));
-    let fallback_bundle =
-        rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+    let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+        rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+        false,
+    );
     let emitter = BufferEmitter { buffer: Lrc::clone(&buffer), fallback_bundle };
 
     let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
diff --git a/src/tools/clippy/clippy_lints/src/doc.rs b/src/tools/clippy/clippy_lints/src/doc.rs
index 660dd8391a3..6fdb7de25cc 100644
--- a/src/tools/clippy/clippy_lints/src/doc.rs
+++ b/src/tools/clippy/clippy_lints/src/doc.rs
@@ -704,8 +704,10 @@ fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
                 let filename = FileName::anon_source_code(&code);
 
                 let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-                let fallback_bundle =
-                    rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+                let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+                    rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+                    false
+                );
                 let emitter = EmitterWriter::new(
                     Box::new(io::sink()),
                     None,
diff --git a/src/tools/clippy/src/driver.rs b/src/tools/clippy/src/driver.rs
index 45209fb8519..9ac849aecf1 100644
--- a/src/tools/clippy/src/driver.rs
+++ b/src/tools/clippy/src/driver.rs
@@ -209,7 +209,10 @@ fn report_clippy_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
     // Separate the output with an empty line
     eprintln!();
 
-    let fallback_bundle = rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+    let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+        rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+        false
+    );
     let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
         rustc_errors::ColorConfig::Auto,
         None,
diff --git a/src/tools/rustfmt/src/parse/session.rs b/src/tools/rustfmt/src/parse/session.rs
index a7a363d47ba..a64963db6a7 100644
--- a/src/tools/rustfmt/src/parse/session.rs
+++ b/src/tools/rustfmt/src/parse/session.rs
@@ -123,8 +123,10 @@ fn default_handler(
     let emitter = if hide_parse_errors {
         silent_emitter()
     } else {
-        let fallback_bundle =
-            rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+        let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+            rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+            false,
+        );
         Box::new(EmitterWriter::stderr(
             color_cfg,
             Some(source_map.clone()),
diff --git a/tests/run-make-fulldeps/hotplug_codegen_backend/the_backend.rs b/tests/run-make-fulldeps/hotplug_codegen_backend/the_backend.rs
index 3aa57d58908..8dac53c2a62 100644
--- a/tests/run-make-fulldeps/hotplug_codegen_backend/the_backend.rs
+++ b/tests/run-make-fulldeps/hotplug_codegen_backend/the_backend.rs
@@ -27,6 +27,8 @@ use std::any::Any;
 struct TheBackend;
 
 impl CodegenBackend for TheBackend {
+    fn locale_resource(&self) -> &'static str { "" }
+
     fn codegen_crate<'a, 'tcx>(
         &self,
         tcx: TyCtxt<'tcx>,
diff --git a/tests/ui-fulldeps/mod_dir_path_canonicalized.rs b/tests/ui-fulldeps/mod_dir_path_canonicalized.rs
index f9d6fc8bae1..ddc86c1dc31 100644
--- a/tests/ui-fulldeps/mod_dir_path_canonicalized.rs
+++ b/tests/ui-fulldeps/mod_dir_path_canonicalized.rs
@@ -30,10 +30,11 @@ pub fn main() {
     assert_eq!(gravy::foo(), 10);
 }
 
-static TEST_LOCALE_RESOURCES: &[&str] = &[rustc_parse::DEFAULT_LOCALE_RESOURCE];
-
 fn parse() {
-    let parse_session = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
+    let parse_session = ParseSess::new(
+        vec![rustc_parse::DEFAULT_LOCALE_RESOURCE],
+        FilePathMapping::empty()
+    );
 
     let path = Path::new(file!());
     let path = path.canonicalize().unwrap();
diff --git a/tests/ui-fulldeps/pprust-expr-roundtrip.rs b/tests/ui-fulldeps/pprust-expr-roundtrip.rs
index 5c8aa865163..e417a6a833b 100644
--- a/tests/ui-fulldeps/pprust-expr-roundtrip.rs
+++ b/tests/ui-fulldeps/pprust-expr-roundtrip.rs
@@ -219,10 +219,8 @@ fn main() {
     rustc_span::create_default_session_globals_then(|| run());
 }
 
-static TEST_LOCALE_RESOURCES: &[&str] = &[rustc_parse::DEFAULT_LOCALE_RESOURCE];
-
 fn run() {
-    let ps = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
+    let ps = ParseSess::new(vec![rustc_parse::DEFAULT_LOCALE_RESOURCE], FilePathMapping::empty());
 
     iter_exprs(2, &mut |mut e| {
         // If the pretty printer is correct, then `parse(print(e))` should be identical to `e`,
-- 
cgit 1.4.1-3-g733a5


From fc5db2cd4fc3030fdc4cad0e6e38e7f80a7aa71b Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Sat, 4 Feb 2023 15:07:41 -0800
Subject: Implement -Zlink-directives=yes/no

`-Zlink-directives=no` will ignored `#[link]` directives while compiling a
crate, so nothing is emitted into the crate's metadata.  The assumption is
that the build system already knows about the crate's native dependencies
and can provide them at link time without these directives.

This is another way to address issue # #70093, which is currently addressed
by `-Zlink-native-libraries` (implemented in #70095). The latter is
implemented at link time, which has the effect of ignoring `#[link]`
in *every* crate. This makes it a very large hammer as it requires all
native dependencies to be known to the build system to be at all usable,
including those in sysroot libraries. I think this means its effectively
unused, and definitely under-used.

Being able to control this on a crate-by-crate basis should make it much
easier to apply when needed.

I'm not sure if we need both mechanisms, but we can decide that later.
---
 compiler/rustc_interface/src/tests.rs                      |  1 +
 compiler/rustc_metadata/src/native_libs.rs                 |  7 ++++++-
 compiler/rustc_session/src/options.rs                      |  2 ++
 tests/rustdoc-ui/z-help.stdout                             |  1 +
 tests/ui/issues/issue-70093.rs                             | 10 ----------
 tests/ui/issues/issue-70093/issue-70093-link-directives.rs | 10 ++++++++++
 tests/ui/issues/issue-70093/issue-70093.rs                 | 10 ++++++++++
 7 files changed, 30 insertions(+), 11 deletions(-)
 delete mode 100644 tests/ui/issues/issue-70093.rs
 create mode 100644 tests/ui/issues/issue-70093/issue-70093-link-directives.rs
 create mode 100644 tests/ui/issues/issue-70093/issue-70093.rs

(limited to 'compiler/rustc_interface/src')

diff --git a/compiler/rustc_interface/src/tests.rs b/compiler/rustc_interface/src/tests.rs
index bfb1e822a26..f9f4c0ec708 100644
--- a/compiler/rustc_interface/src/tests.rs
+++ b/compiler/rustc_interface/src/tests.rs
@@ -756,6 +756,7 @@ fn test_unstable_options_tracking_hash() {
     tracked!(instrument_coverage, Some(InstrumentCoverage::All));
     tracked!(instrument_mcount, true);
     tracked!(instrument_xray, Some(InstrumentXRay::default()));
+    tracked!(link_directives, false);
     tracked!(link_only, true);
     tracked!(llvm_plugins, vec![String::from("plugin_name")]);
     tracked!(location_detail, LocationDetail { file: true, line: false, column: false });
diff --git a/compiler/rustc_metadata/src/native_libs.rs b/compiler/rustc_metadata/src/native_libs.rs
index d823989bb02..91cb35f6724 100644
--- a/compiler/rustc_metadata/src/native_libs.rs
+++ b/compiler/rustc_metadata/src/native_libs.rs
@@ -103,8 +103,13 @@ impl<'tcx> Collector<'tcx> {
         }
 
         // Process all of the #[link(..)]-style arguments
-        let sess = &self.tcx.sess;
+        let sess = self.tcx.sess;
         let features = self.tcx.features();
+
+        if !sess.opts.unstable_opts.link_directives {
+            return;
+        }
+
         for m in self.tcx.hir().attrs(it.hir_id()).iter().filter(|a| a.has_name(sym::link)) {
             let Some(items) = m.meta_item_list() else {
                 continue;
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index 1f3eb8d4832..eb8e54fa0bd 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -1489,6 +1489,8 @@ options! {
         "keep hygiene data after analysis (default: no)"),
     layout_seed: Option<u64> = (None, parse_opt_number, [TRACKED],
         "seed layout randomization"),
+    link_directives: bool = (true, parse_bool, [TRACKED],
+        "honour #[link] directives in crates (default: yes)"),
     link_native_libraries: bool = (true, parse_bool, [UNTRACKED],
         "link native libraries in the linker invocation (default: yes)"),
     link_only: bool = (false, parse_bool, [TRACKED],
diff --git a/tests/rustdoc-ui/z-help.stdout b/tests/rustdoc-ui/z-help.stdout
index 58b2f92d150..55876326e5e 100644
--- a/tests/rustdoc-ui/z-help.stdout
+++ b/tests/rustdoc-ui/z-help.stdout
@@ -81,6 +81,7 @@
          Multiple options can be combined with commas.
     -Z                     keep-hygiene-data=val -- keep hygiene data after analysis (default: no)
     -Z                           layout-seed=val -- seed layout randomization
+    -Z                       link-directives=val -- honour #[link] directives in crates (default: yes)
     -Z                 link-native-libraries=val -- link native libraries in the linker invocation (default: yes)
     -Z                             link-only=val -- link the `.rlink` file generated by `-Z no-link` (default: no)
     -Z                          llvm-plugins=val -- a list LLVM plugins to enable (space separated)
diff --git a/tests/ui/issues/issue-70093.rs b/tests/ui/issues/issue-70093.rs
deleted file mode 100644
index 86459dc904a..00000000000
--- a/tests/ui/issues/issue-70093.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-// run-pass
-// compile-flags: -Zlink-native-libraries=no -Cdefault-linker-libraries=yes
-// ignore-windows - this will probably only work on unixish systems
-// ignore-fuchsia - missing __libc_start_main for some reason (#84733)
-// ignore-cross-compile - default-linker-libraries=yes doesn't play well with cross compiling
-
-#[link(name = "some-random-non-existent-library", kind = "static")]
-extern "C" {}
-
-fn main() {}
diff --git a/tests/ui/issues/issue-70093/issue-70093-link-directives.rs b/tests/ui/issues/issue-70093/issue-70093-link-directives.rs
new file mode 100644
index 00000000000..83f9b16c408
--- /dev/null
+++ b/tests/ui/issues/issue-70093/issue-70093-link-directives.rs
@@ -0,0 +1,10 @@
+// run-pass
+// compile-flags: -Zlink-directives=no
+// ignore-windows - this will probably only work on unixish systems
+// ignore-fuchsia - missing __libc_start_main for some reason (#84733)
+// ignore-cross-compile - default-linker-libraries=yes doesn't play well with cross compiling
+
+#[link(name = "some-random-non-existent-library", kind = "static")]
+extern "C" {}
+
+fn main() {}
diff --git a/tests/ui/issues/issue-70093/issue-70093.rs b/tests/ui/issues/issue-70093/issue-70093.rs
new file mode 100644
index 00000000000..86459dc904a
--- /dev/null
+++ b/tests/ui/issues/issue-70093/issue-70093.rs
@@ -0,0 +1,10 @@
+// run-pass
+// compile-flags: -Zlink-native-libraries=no -Cdefault-linker-libraries=yes
+// ignore-windows - this will probably only work on unixish systems
+// ignore-fuchsia - missing __libc_start_main for some reason (#84733)
+// ignore-cross-compile - default-linker-libraries=yes doesn't play well with cross compiling
+
+#[link(name = "some-random-non-existent-library", kind = "static")]
+extern "C" {}
+
+fn main() {}
-- 
cgit 1.4.1-3-g733a5


From 5965948ba12550e03701ebf860d5c10af12f3efc Mon Sep 17 00:00:00 2001
From: Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de>
Date: Wed, 25 Jan 2023 10:47:09 +0000
Subject: Remove a back compat warning

---
 compiler/rustc_interface/locales/en-US.ftl |  4 ----
 compiler/rustc_interface/src/errors.rs     |  4 ----
 compiler/rustc_interface/src/passes.rs     | 34 +++++++++++-------------------
 3 files changed, 12 insertions(+), 30 deletions(-)

(limited to 'compiler/rustc_interface/src')

diff --git a/compiler/rustc_interface/locales/en-US.ftl b/compiler/rustc_interface/locales/en-US.ftl
index a7bc0e7af1f..da58492ccf2 100644
--- a/compiler/rustc_interface/locales/en-US.ftl
+++ b/compiler/rustc_interface/locales/en-US.ftl
@@ -11,10 +11,6 @@ interface_mixed_bin_crate =
 interface_mixed_proc_macro_crate =
     cannot mix `proc-macro` crate type with others
 
-interface_proc_macro_doc_without_arg =
-    Trying to document proc macro crate without passing '--crate-type proc-macro to rustdoc
-    .warn = The generated documentation may be incorrect
-
 interface_error_writing_dependencies =
     error writing dependencies to `{$path}`: {$error}
 
diff --git a/compiler/rustc_interface/src/errors.rs b/compiler/rustc_interface/src/errors.rs
index 29543fe2f93..0eedee25026 100644
--- a/compiler/rustc_interface/src/errors.rs
+++ b/compiler/rustc_interface/src/errors.rs
@@ -31,10 +31,6 @@ pub struct MixedBinCrate;
 #[diag(interface_mixed_proc_macro_crate)]
 pub struct MixedProcMacroCrate;
 
-#[derive(Diagnostic)]
-#[diag(interface_proc_macro_doc_without_arg)]
-pub struct ProcMacroDocWithoutArg;
-
 #[derive(Diagnostic)]
 #[diag(interface_error_writing_dependencies)]
 pub struct ErrorWritingDependencies<'a> {
diff --git a/compiler/rustc_interface/src/passes.rs b/compiler/rustc_interface/src/passes.rs
index aa59654099a..81c1d665ef0 100644
--- a/compiler/rustc_interface/src/passes.rs
+++ b/compiler/rustc_interface/src/passes.rs
@@ -287,28 +287,18 @@ fn configure_and_expand(mut krate: ast::Crate, resolver: &mut Resolver<'_, '_>)
         sess.emit_warning(errors::ProcMacroCratePanicAbort);
     }
 
-    // For backwards compatibility, we don't try to run proc macro injection
-    // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
-    // specified. This should only affect users who manually invoke 'rustdoc', as
-    // 'cargo doc' will automatically pass the proper '--crate-type' flags.
-    // However, we do emit a warning, to let such users know that they should
-    // start passing '--crate-type proc-macro'
-    if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
-        sess.emit_warning(errors::ProcMacroDocWithoutArg);
-    } else {
-        krate = sess.time("maybe_create_a_macro_crate", || {
-            let is_test_crate = sess.opts.test;
-            rustc_builtin_macros::proc_macro_harness::inject(
-                sess,
-                resolver,
-                krate,
-                is_proc_macro_crate,
-                has_proc_macro_decls,
-                is_test_crate,
-                sess.diagnostic(),
-            )
-        });
-    }
+    krate = sess.time("maybe_create_a_macro_crate", || {
+        let is_test_crate = sess.opts.test;
+        rustc_builtin_macros::proc_macro_harness::inject(
+            sess,
+            resolver,
+            krate,
+            is_proc_macro_crate,
+            has_proc_macro_decls,
+            is_test_crate,
+            sess.diagnostic(),
+        )
+    });
 
     // Done with macro expansion!
 
-- 
cgit 1.4.1-3-g733a5