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authorThe Miri Cronjob Bot <miri@cron.bot>2025-06-04 05:02:17 +0000
committerThe Miri Cronjob Bot <miri@cron.bot>2025-06-04 05:02:17 +0000
commitdb720882b2e193edb002019e16397088175d21a2 (patch)
treeefd0e5b7d344ea8f0bbc6e661bed96c17366dac2 /src/tools
parentbeff63bb98effefbc9204ff52a66a92545120786 (diff)
parent7742d0e230b602a0a73d38b32de47449f3306450 (diff)
downloadrust-db720882b2e193edb002019e16397088175d21a2.tar.gz
rust-db720882b2e193edb002019e16397088175d21a2.zip
Merge from rustc
Diffstat (limited to 'src/tools')
-rw-r--r--src/tools/clippy/clippy_lints/src/disallowed_types.rs4
-rw-r--r--src/tools/clippy/clippy_lints/src/legacy_numeric_constants.rs4
-rw-r--r--src/tools/clippy/clippy_lints/src/macro_use.rs5
-rw-r--r--src/tools/clippy/clippy_lints/src/min_ident_chars.rs5
-rw-r--r--src/tools/clippy/clippy_lints/src/missing_enforced_import_rename.rs3
-rw-r--r--src/tools/clippy/clippy_lints/src/redundant_pub_crate.rs23
-rw-r--r--src/tools/clippy/clippy_lints/src/unused_trait_names.rs2
-rw-r--r--src/tools/clippy/clippy_lints/src/wildcard_imports.rs4
-rw-r--r--src/tools/clippy/clippy_utils/src/paths.rs11
-rw-r--r--src/tools/clippy/tests/ui/indexing_slicing_index.rs2
-rw-r--r--src/tools/clippy/tests/ui/indexing_slicing_index.stderr4
-rw-r--r--src/tools/miri/src/helpers.rs14
-rw-r--r--src/tools/miri/src/shims/aarch64.rs7
-rw-r--r--src/tools/miri/src/shims/backtrace.rs12
-rw-r--r--src/tools/miri/src/shims/foreign_items.rs79
-rw-r--r--src/tools/miri/src/shims/unix/android/foreign_items.rs13
-rw-r--r--src/tools/miri/src/shims/unix/android/thread.rs6
-rw-r--r--src/tools/miri/src/shims/unix/foreign_items.rs124
-rw-r--r--src/tools/miri/src/shims/unix/freebsd/foreign_items.rs23
-rw-r--r--src/tools/miri/src/shims/unix/linux/foreign_items.rs38
-rw-r--r--src/tools/miri/src/shims/unix/linux_like/syscall.rs5
-rw-r--r--src/tools/miri/src/shims/unix/macos/foreign_items.rs65
-rw-r--r--src/tools/miri/src/shims/unix/solarish/foreign_items.rs33
-rw-r--r--src/tools/miri/src/shims/wasi/foreign_items.rs7
-rw-r--r--src/tools/miri/src/shims/windows/foreign_items.rs12
-rw-r--r--src/tools/miri/src/shims/x86/aesni.rs13
-rw-r--r--src/tools/miri/src/shims/x86/avx.rs41
-rw-r--r--src/tools/miri/src/shims/x86/avx2.rs43
-rw-r--r--src/tools/miri/src/shims/x86/bmi.rs5
-rw-r--r--src/tools/miri/src/shims/x86/gfni.rs9
-rw-r--r--src/tools/miri/src/shims/x86/mod.rs12
-rw-r--r--src/tools/miri/src/shims/x86/sha.rs9
-rw-r--r--src/tools/miri/src/shims/x86/sse.rs21
-rw-r--r--src/tools/miri/src/shims/x86/sse2.rs31
-rw-r--r--src/tools/miri/src/shims/x86/sse3.rs7
-rw-r--r--src/tools/miri/src/shims/x86/sse41.rs23
-rw-r--r--src/tools/miri/src/shims/x86/sse42.rs14
-rw-r--r--src/tools/miri/src/shims/x86/ssse3.rs15
-rw-r--r--src/tools/miri/tests/fail/const-ub-checks.rs2
-rw-r--r--src/tools/miri/tests/fail/const-ub-checks.stderr4
-rw-r--r--src/tools/miri/tests/fail/erroneous_const.rs2
-rw-r--r--src/tools/miri/tests/fail/erroneous_const.stderr4
-rw-r--r--src/tools/miri/tests/fail/erroneous_const2.rs2
-rw-r--r--src/tools/miri/tests/fail/erroneous_const2.stderr4
-rw-r--r--src/tools/miri/tests/pass/iter_macro.rs22
-rw-r--r--src/tools/rust-analyzer/crates/hir-expand/src/files.rs52
-rw-r--r--src/tools/rust-analyzer/crates/hir-expand/src/lib.rs18
-rw-r--r--src/tools/rust-analyzer/crates/hir-expand/src/prettify_macro_expansion_.rs80
-rw-r--r--src/tools/rust-analyzer/crates/hir/src/semantics.rs219
-rw-r--r--src/tools/rust-analyzer/crates/hir/src/source_analyzer.rs1
-rw-r--r--src/tools/rust-analyzer/crates/ide-assists/src/handlers/auto_import.rs38
-rw-r--r--src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_bool_to_enum.rs8
-rw-r--r--src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_named_struct_to_tuple_struct.rs3
-rw-r--r--src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_tuple_struct_to_named_struct.rs3
-rw-r--r--src/tools/rust-analyzer/crates/ide-assists/src/handlers/extract_function.rs7
-rw-r--r--src/tools/rust-analyzer/crates/ide-assists/src/handlers/replace_qualified_name_with_use.rs6
-rw-r--r--src/tools/rust-analyzer/crates/ide-assists/src/handlers/unqualify_method_call.rs7
-rw-r--r--src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use.rs144
-rw-r--r--src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use/tests.rs101
-rw-r--r--src/tools/rust-analyzer/crates/ide-db/src/search.rs14
-rw-r--r--src/tools/rust-analyzer/crates/ide-db/src/source_change.rs12
-rw-r--r--src/tools/rust-analyzer/crates/ide-diagnostics/src/handlers/json_is_not_rust.rs6
-rw-r--r--src/tools/rust-analyzer/crates/ide/src/goto_definition.rs2
-rw-r--r--src/tools/rust-analyzer/crates/ide/src/goto_type_definition.rs4
-rw-r--r--src/tools/rust-analyzer/crates/ide/src/highlight_related.rs29
-rw-r--r--src/tools/rust-analyzer/crates/ide/src/hover.rs2
-rw-r--r--src/tools/rust-analyzer/crates/ide/src/lib.rs1
-rw-r--r--src/tools/rust-analyzer/crates/ide/src/references.rs92
-rw-r--r--src/tools/rust-analyzer/crates/ide/src/rename.rs2
-rw-r--r--src/tools/rust-analyzer/crates/ide/src/syntax_highlighting.rs2
-rw-r--r--src/tools/rust-analyzer/crates/mbe/src/tests.rs3
-rw-r--r--src/tools/rust-analyzer/crates/rust-analyzer/src/handlers/dispatch.rs9
-rw-r--r--src/tools/rust-analyzer/crates/rust-analyzer/src/lsp/from_proto.rs1
-rw-r--r--src/tools/rust-analyzer/crates/span/src/lib.rs5
-rw-r--r--src/tools/rust-analyzer/crates/syntax-bridge/src/prettify_macro_expansion.rs43
-rw-r--r--src/tools/rust-analyzer/crates/syntax/src/ted.rs14
-rw-r--r--src/tools/rust-analyzer/crates/vfs/src/vfs_path.rs7
-rw-r--r--src/tools/rust-analyzer/xtask/src/codegen.rs4
-rw-r--r--src/tools/test-float-parse/Cargo.lock75
-rw-r--r--src/tools/test-float-parse/Cargo.toml22
-rw-r--r--src/tools/test-float-parse/README.md55
-rw-r--r--src/tools/test-float-parse/src/gen_/exhaustive.rs42
-rw-r--r--src/tools/test-float-parse/src/gen_/exponents.rs95
-rw-r--r--src/tools/test-float-parse/src/gen_/fuzz.rs87
-rw-r--r--src/tools/test-float-parse/src/gen_/integers.rs104
-rw-r--r--src/tools/test-float-parse/src/gen_/long_fractions.rs58
-rw-r--r--src/tools/test-float-parse/src/gen_/many_digits.rs84
-rw-r--r--src/tools/test-float-parse/src/gen_/sparse.rs99
-rw-r--r--src/tools/test-float-parse/src/gen_/spot_checks.rs101
-rw-r--r--src/tools/test-float-parse/src/gen_/subnorm.rs108
-rw-r--r--src/tools/test-float-parse/src/lib.rs419
-rw-r--r--src/tools/test-float-parse/src/main.rs129
-rw-r--r--src/tools/test-float-parse/src/traits.rs206
-rw-r--r--src/tools/test-float-parse/src/ui.rs168
-rw-r--r--src/tools/test-float-parse/src/validate.rs394
-rw-r--r--src/tools/test-float-parse/src/validate/tests.rs149
-rw-r--r--src/tools/tidy/src/deps.rs2
-rw-r--r--src/tools/tidy/src/pal.rs1
-rw-r--r--src/tools/tidy/src/walk.rs1
99 files changed, 3459 insertions, 667 deletions
diff --git a/src/tools/clippy/clippy_lints/src/disallowed_types.rs b/src/tools/clippy/clippy_lints/src/disallowed_types.rs
index d0b2f0c8407..821bb25d2ce 100644
--- a/src/tools/clippy/clippy_lints/src/disallowed_types.rs
+++ b/src/tools/clippy/clippy_lints/src/disallowed_types.rs
@@ -106,8 +106,8 @@ impl_lint_pass!(DisallowedTypes => [DISALLOWED_TYPES]);
 impl<'tcx> LateLintPass<'tcx> for DisallowedTypes {
     fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
         if let ItemKind::Use(path, UseKind::Single(_)) = &item.kind {
-            for res in &path.res {
-                self.check_res_emit(cx, res, item.span);
+            if let Some(res) = path.res.type_ns {
+                self.check_res_emit(cx, &res, item.span);
             }
         }
     }
diff --git a/src/tools/clippy/clippy_lints/src/legacy_numeric_constants.rs b/src/tools/clippy/clippy_lints/src/legacy_numeric_constants.rs
index 01b49403cac..b3c63f022d3 100644
--- a/src/tools/clippy/clippy_lints/src/legacy_numeric_constants.rs
+++ b/src/tools/clippy/clippy_lints/src/legacy_numeric_constants.rs
@@ -51,7 +51,9 @@ impl<'tcx> LateLintPass<'tcx> for LegacyNumericConstants {
         // so lint on the `use` statement directly.
         if let ItemKind::Use(path, kind @ (UseKind::Single(_) | UseKind::Glob)) = item.kind
             && !item.span.in_external_macro(cx.sess().source_map())
-            && let Some(def_id) = path.res[0].opt_def_id()
+            // use `present_items` because it could be in either type_ns or value_ns
+            && let Some(res) = path.res.present_items().next()
+            && let Some(def_id) = res.opt_def_id()
             && self.msrv.meets(cx, msrvs::NUMERIC_ASSOCIATED_CONSTANTS)
         {
             let module = if is_integer_module(cx, def_id) {
diff --git a/src/tools/clippy/clippy_lints/src/macro_use.rs b/src/tools/clippy/clippy_lints/src/macro_use.rs
index 98ad1f6a160..c1a26c5a9c7 100644
--- a/src/tools/clippy/clippy_lints/src/macro_use.rs
+++ b/src/tools/clippy/clippy_lints/src/macro_use.rs
@@ -100,10 +100,7 @@ impl LateLintPass<'_> for MacroUseImports {
             && let hir_id = item.hir_id()
             && let attrs = cx.tcx.hir_attrs(hir_id)
             && let Some(mac_attr) = attrs.iter().find(|attr| attr.has_name(sym::macro_use))
-            && let Some(id) = path.res.iter().find_map(|res| match res {
-                Res::Def(DefKind::Mod, id) => Some(id),
-                _ => None,
-            })
+            && let Some(Res::Def(DefKind::Mod, id)) = path.res.type_ns
             && !id.is_local()
         {
             for kid in cx.tcx.module_children(id) {
diff --git a/src/tools/clippy/clippy_lints/src/min_ident_chars.rs b/src/tools/clippy/clippy_lints/src/min_ident_chars.rs
index 00ea9bba0d1..99f01c8001a 100644
--- a/src/tools/clippy/clippy_lints/src/min_ident_chars.rs
+++ b/src/tools/clippy/clippy_lints/src/min_ident_chars.rs
@@ -131,8 +131,9 @@ impl Visitor<'_> for IdentVisitor<'_, '_> {
             // If however the identifier is different, this means it is an alias (`use foo::bar as baz`). In
             // this case, we need to emit the warning for `baz`.
             if let Some(imported_item_path) = usenode
-                && let Some(Res::Def(_, imported_item_defid)) = imported_item_path.res.first()
-                && cx.tcx.item_name(*imported_item_defid).as_str() == str
+                // use `present_items` because it could be in any of type_ns, value_ns, macro_ns
+                && let Some(Res::Def(_, imported_item_defid)) = imported_item_path.res.value_ns
+                && cx.tcx.item_name(imported_item_defid).as_str() == str
             {
                 return;
             }
diff --git a/src/tools/clippy/clippy_lints/src/missing_enforced_import_rename.rs b/src/tools/clippy/clippy_lints/src/missing_enforced_import_rename.rs
index a1e621cc9f6..eeea6dfd5f4 100644
--- a/src/tools/clippy/clippy_lints/src/missing_enforced_import_rename.rs
+++ b/src/tools/clippy/clippy_lints/src/missing_enforced_import_rename.rs
@@ -72,7 +72,8 @@ impl_lint_pass!(ImportRename => [MISSING_ENFORCED_IMPORT_RENAMES]);
 impl LateLintPass<'_> for ImportRename {
     fn check_item(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
         if let ItemKind::Use(path, UseKind::Single(_)) = &item.kind {
-            for &res in &path.res {
+            // use `present_items` because it could be in any of type_ns, value_ns, macro_ns
+            for res in path.res.present_items() {
                 if let Res::Def(_, id) = res
                     && let Some(name) = self.renames.get(&id)
                     // Remove semicolon since it is not present for nested imports
diff --git a/src/tools/clippy/clippy_lints/src/redundant_pub_crate.rs b/src/tools/clippy/clippy_lints/src/redundant_pub_crate.rs
index 7b381fac5f1..3828aff4164 100644
--- a/src/tools/clippy/clippy_lints/src/redundant_pub_crate.rs
+++ b/src/tools/clippy/clippy_lints/src/redundant_pub_crate.rs
@@ -2,7 +2,7 @@ use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::source::HasSession;
 use rustc_errors::Applicability;
 use rustc_hir::def::{DefKind, Res};
-use rustc_hir::{Item, ItemKind};
+use rustc_hir::{Item, ItemKind, UseKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty;
 use rustc_session::impl_lint_pass;
@@ -49,7 +49,7 @@ impl<'tcx> LateLintPass<'tcx> for RedundantPubCrate {
         if cx.tcx.visibility(item.owner_id.def_id) == ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())
             && !cx.effective_visibilities.is_exported(item.owner_id.def_id)
             && self.is_exported.last() == Some(&false)
-            && is_not_macro_export(item)
+            && !is_ignorable_export(item)
             && !item.span.in_external_macro(cx.sess().source_map())
         {
             let span = item
@@ -86,18 +86,17 @@ impl<'tcx> LateLintPass<'tcx> for RedundantPubCrate {
     }
 }
 
-fn is_not_macro_export<'tcx>(item: &'tcx Item<'tcx>) -> bool {
-    if let ItemKind::Use(path, _) = item.kind {
-        if path
-            .res
-            .iter()
-            .all(|res| matches!(res, Res::Def(DefKind::Macro(MacroKind::Bang), _)))
-        {
-            return false;
+// We ignore macro exports. And `ListStem` uses, which aren't interesting.
+fn is_ignorable_export<'tcx>(item: &'tcx Item<'tcx>) -> bool {
+    if let ItemKind::Use(path, kind) = item.kind {
+        let ignore = matches!(path.res.macro_ns, Some(Res::Def(DefKind::Macro(MacroKind::Bang), _)))
+            || kind == UseKind::ListStem;
+        if ignore {
+            return true;
         }
     } else if let ItemKind::Macro(..) = item.kind {
-        return false;
+        return true;
     }
 
-    true
+    false
 }
diff --git a/src/tools/clippy/clippy_lints/src/unused_trait_names.rs b/src/tools/clippy/clippy_lints/src/unused_trait_names.rs
index 14ac65cf4df..610cec7b8c8 100644
--- a/src/tools/clippy/clippy_lints/src/unused_trait_names.rs
+++ b/src/tools/clippy/clippy_lints/src/unused_trait_names.rs
@@ -64,7 +64,7 @@ impl<'tcx> LateLintPass<'tcx> for UnusedTraitNames {
             // Ignore imports that already use Underscore
             && ident.name != kw::Underscore
             // Only check traits
-            && let Some(Res::Def(DefKind::Trait, _)) = path.res.first()
+            && let Some(Res::Def(DefKind::Trait, _)) = path.res.type_ns
             && cx.tcx.maybe_unused_trait_imports(()).contains(&item.owner_id.def_id)
             // Only check this import if it is visible to its module only (no pub, pub(crate), ...)
             && let module = cx.tcx.parent_module_from_def_id(item.owner_id.def_id)
diff --git a/src/tools/clippy/clippy_lints/src/wildcard_imports.rs b/src/tools/clippy/clippy_lints/src/wildcard_imports.rs
index 45a5dbabeb4..467811c586b 100644
--- a/src/tools/clippy/clippy_lints/src/wildcard_imports.rs
+++ b/src/tools/clippy/clippy_lints/src/wildcard_imports.rs
@@ -169,8 +169,8 @@ impl LateLintPass<'_> for WildcardImports {
                 format!("{import_source_snippet}::{imports_string}")
             };
 
-            // Glob imports always have a single resolution.
-            let (lint, message) = if let Res::Def(DefKind::Enum, _) = use_path.res[0] {
+            // Glob imports always have a single resolution. Enums are in the value namespace.
+            let (lint, message) = if let Some(Res::Def(DefKind::Enum, _)) = use_path.res.value_ns {
                 (ENUM_GLOB_USE, "usage of wildcard import for enum variants")
             } else {
                 (WILDCARD_IMPORTS, "usage of wildcard import")
diff --git a/src/tools/clippy/clippy_utils/src/paths.rs b/src/tools/clippy/clippy_utils/src/paths.rs
index 9d7f3086b05..f37a609497e 100644
--- a/src/tools/clippy/clippy_utils/src/paths.rs
+++ b/src/tools/clippy/clippy_utils/src/paths.rs
@@ -306,10 +306,13 @@ fn local_item_child_by_name(tcx: TyCtxt<'_>, local_id: LocalDefId, ns: PathNS, n
             let item = tcx.hir_item(item_id);
             if let ItemKind::Use(path, UseKind::Single(ident)) = item.kind {
                 if ident.name == name {
-                    path.res
-                        .iter()
-                        .find(|res| ns.matches(res.ns()))
-                        .and_then(Res::opt_def_id)
+                    let opt_def_id = |ns: Option<Res>| ns.and_then(|res| res.opt_def_id());
+                    match ns {
+                        PathNS::Type => opt_def_id(path.res.type_ns),
+                        PathNS::Value => opt_def_id(path.res.value_ns),
+                        PathNS::Macro => opt_def_id(path.res.macro_ns),
+                        PathNS::Arbitrary => unreachable!(),
+                    }
                 } else {
                     None
                 }
diff --git a/src/tools/clippy/tests/ui/indexing_slicing_index.rs b/src/tools/clippy/tests/ui/indexing_slicing_index.rs
index cfa1c2f7c75..ab6a8235008 100644
--- a/src/tools/clippy/tests/ui/indexing_slicing_index.rs
+++ b/src/tools/clippy/tests/ui/indexing_slicing_index.rs
@@ -68,7 +68,7 @@ fn main() {
     // This should be linted, since `suppress-restriction-lint-in-const` default is false.
     const { &ARR[idx4()] };
     //~^ ERROR: indexing may panic
-    //~| ERROR: evaluation of `main
+    //~| ERROR: index out of bounds
 
     let y = &x;
     // Ok, referencing shouldn't affect this lint. See the issue 6021
diff --git a/src/tools/clippy/tests/ui/indexing_slicing_index.stderr b/src/tools/clippy/tests/ui/indexing_slicing_index.stderr
index 50ee9b9edc7..8e24b898ed5 100644
--- a/src/tools/clippy/tests/ui/indexing_slicing_index.stderr
+++ b/src/tools/clippy/tests/ui/indexing_slicing_index.stderr
@@ -9,11 +9,11 @@ LL | const REF: &i32 = &ARR[idx()]; // This should be linted, since `suppress-re
    = note: `-D clippy::indexing-slicing` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::indexing_slicing)]`
 
-error[E0080]: evaluation of `main::{constant#3}` failed
+error[E0080]: index out of bounds: the length is 2 but the index is 4
   --> tests/ui/indexing_slicing_index.rs:69:14
    |
 LL |     const { &ARR[idx4()] };
-   |              ^^^^^^^^^^^ index out of bounds: the length is 2 but the index is 4
+   |              ^^^^^^^^^^^ evaluation of `main::{constant#3}` failed here
 
 note: erroneous constant encountered
   --> tests/ui/indexing_slicing_index.rs:69:5
diff --git a/src/tools/miri/src/helpers.rs b/src/tools/miri/src/helpers.rs
index dcc74b099d6..20ea239b7e5 100644
--- a/src/tools/miri/src/helpers.rs
+++ b/src/tools/miri/src/helpers.rs
@@ -3,7 +3,7 @@ use std::time::Duration;
 use std::{cmp, iter};
 
 use rand::RngCore;
-use rustc_abi::{Align, ExternAbi, FieldIdx, FieldsShape, Size, Variants};
+use rustc_abi::{Align, CanonAbi, ExternAbi, FieldIdx, FieldsShape, Size, Variants};
 use rustc_apfloat::Float;
 use rustc_apfloat::ieee::{Double, Half, Quad, Single};
 use rustc_hir::Safety;
@@ -18,7 +18,7 @@ use rustc_middle::ty::{self, Binder, FloatTy, FnSig, IntTy, Ty, TyCtxt, UintTy};
 use rustc_session::config::CrateType;
 use rustc_span::{Span, Symbol};
 use rustc_symbol_mangling::mangle_internal_symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::*;
 
@@ -936,11 +936,11 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
     fn check_callconv<'a>(
         &self,
         fn_abi: &FnAbi<'tcx, Ty<'tcx>>,
-        exp_abi: Conv,
+        exp_abi: CanonAbi,
     ) -> InterpResult<'a, ()> {
         if fn_abi.conv != exp_abi {
             throw_ub_format!(
-                "calling a function with calling convention {exp_abi} using caller calling convention {}",
+                r#"calling a function with calling convention "{exp_abi}" using caller calling convention "{}""#,
                 fn_abi.conv
             );
         }
@@ -973,7 +973,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
     fn check_abi_and_shim_symbol_clash(
         &mut self,
         abi: &FnAbi<'tcx, Ty<'tcx>>,
-        exp_abi: Conv,
+        exp_abi: CanonAbi,
         link_name: Symbol,
     ) -> InterpResult<'tcx, ()> {
         self.check_callconv(abi, exp_abi)?;
@@ -998,7 +998,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
     fn check_shim<'a, const N: usize>(
         &mut self,
         abi: &FnAbi<'tcx, Ty<'tcx>>,
-        exp_abi: Conv,
+        exp_abi: CanonAbi,
         link_name: Symbol,
         args: &'a [OpTy<'tcx>],
     ) -> InterpResult<'tcx, &'a [OpTy<'tcx>; N]> {
@@ -1098,7 +1098,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
     fn check_shim_variadic<'a, const N: usize>(
         &mut self,
         abi: &FnAbi<'tcx, Ty<'tcx>>,
-        exp_abi: Conv,
+        exp_abi: CanonAbi,
         link_name: Symbol,
         args: &'a [OpTy<'tcx>],
     ) -> InterpResult<'tcx, (&'a [OpTy<'tcx>; N], &'a [OpTy<'tcx>])>
diff --git a/src/tools/miri/src/shims/aarch64.rs b/src/tools/miri/src/shims/aarch64.rs
index 7cccc9e51d8..44ad5081ad5 100644
--- a/src/tools/miri/src/shims/aarch64.rs
+++ b/src/tools/miri/src/shims/aarch64.rs
@@ -1,7 +1,8 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::mir::BinOp;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::*;
 
@@ -19,7 +20,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         let unprefixed_name = link_name.as_str().strip_prefix("llvm.aarch64.").unwrap();
         match unprefixed_name {
             "isb" => {
-                let [arg] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [arg] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let arg = this.read_scalar(arg)?.to_i32()?;
                 match arg {
                     // SY ("full system scope")
@@ -37,7 +38,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // `left` input, the second half of the output from the `right` input.
             // https://developer.arm.com/architectures/instruction-sets/intrinsics/vpmaxq_u8
             "neon.umaxp.v16i8" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
diff --git a/src/tools/miri/src/shims/backtrace.rs b/src/tools/miri/src/shims/backtrace.rs
index 9f3bc06771f..ab11553df63 100644
--- a/src/tools/miri/src/shims/backtrace.rs
+++ b/src/tools/miri/src/shims/backtrace.rs
@@ -1,8 +1,8 @@
-use rustc_abi::Size;
+use rustc_abi::{CanonAbi, Size};
 use rustc_middle::ty::layout::LayoutOf as _;
 use rustc_middle::ty::{self, Instance, Ty};
 use rustc_span::{BytePos, Loc, Symbol, hygiene};
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::*;
 
@@ -16,7 +16,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         dest: &MPlaceTy<'tcx>,
     ) -> InterpResult<'tcx> {
         let this = self.eval_context_mut();
-        let [flags] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+        let [flags] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
 
         let flags = this.read_scalar(flags)?.to_u64()?;
         if flags != 0 {
@@ -38,7 +38,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         let ptr_ty = this.machine.layouts.mut_raw_ptr.ty;
         let ptr_layout = this.layout_of(ptr_ty)?;
 
-        let [flags, buf] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+        let [flags, buf] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
 
         let flags = this.read_scalar(flags)?.to_u64()?;
         let buf_place = this.deref_pointer_as(buf, ptr_layout)?;
@@ -118,7 +118,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         dest: &MPlaceTy<'tcx>,
     ) -> InterpResult<'tcx> {
         let this = self.eval_context_mut();
-        let [ptr, flags] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+        let [ptr, flags] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
 
         let flags = this.read_scalar(flags)?.to_u64()?;
 
@@ -190,7 +190,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         let this = self.eval_context_mut();
 
         let [ptr, flags, name_ptr, filename_ptr] =
-            this.check_shim(abi, Conv::Rust, link_name, args)?;
+            this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
 
         let flags = this.read_scalar(flags)?.to_u64()?;
         if flags != 0 {
diff --git a/src/tools/miri/src/shims/foreign_items.rs b/src/tools/miri/src/shims/foreign_items.rs
index b08b522d279..ae04ca018ab 100644
--- a/src/tools/miri/src/shims/foreign_items.rs
+++ b/src/tools/miri/src/shims/foreign_items.rs
@@ -2,7 +2,7 @@ use std::collections::hash_map::Entry;
 use std::io::Write;
 use std::path::Path;
 
-use rustc_abi::{Align, AlignFromBytesError, Size};
+use rustc_abi::{Align, AlignFromBytesError, CanonAbi, Size};
 use rustc_apfloat::Float;
 use rustc_ast::expand::allocator::alloc_error_handler_name;
 use rustc_hir::def::DefKind;
@@ -12,7 +12,7 @@ use rustc_middle::mir::interpret::AllocInit;
 use rustc_middle::ty::{Instance, Ty};
 use rustc_middle::{mir, ty};
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use self::helpers::{ToHost, ToSoft};
 use super::alloc::EvalContextExt as _;
@@ -250,7 +250,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
         // When adding a new shim, you should follow the following pattern:
         // ```
         // "shim_name" => {
-        //     let [arg1, arg2, arg3] = this.check_shim(abi, Conv::::C , link_name, args)?;
+        //     let [arg1, arg2, arg3] = this.check_shim(abi, CanonAbi::C , link_name, args)?;
         //     let result = this.shim_name(arg1, arg2, arg3)?;
         //     this.write_scalar(result, dest)?;
         // }
@@ -288,16 +288,16 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
         match link_name.as_str() {
             // Miri-specific extern functions
             "miri_start_unwind" => {
-                let [payload] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+                let [payload] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                 this.handle_miri_start_unwind(payload)?;
                 return interp_ok(EmulateItemResult::NeedsUnwind);
             }
             "miri_run_provenance_gc" => {
-                let [] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                 this.run_provenance_gc();
             }
             "miri_get_alloc_id" => {
-                let [ptr] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+                let [ptr] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let (alloc_id, _, _) = this.ptr_get_alloc_id(ptr, 0).map_err_kind(|_e| {
                     err_machine_stop!(TerminationInfo::Abort(format!(
@@ -307,7 +307,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(Scalar::from_u64(alloc_id.0.get()), dest)?;
             }
             "miri_print_borrow_state" => {
-                let [id, show_unnamed] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+                let [id, show_unnamed] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                 let id = this.read_scalar(id)?.to_u64()?;
                 let show_unnamed = this.read_scalar(show_unnamed)?.to_bool()?;
                 if let Some(id) = std::num::NonZero::new(id).map(AllocId)
@@ -321,7 +321,8 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
             "miri_pointer_name" => {
                 // This associates a name to a tag. Very useful for debugging, and also makes
                 // tests more strict.
-                let [ptr, nth_parent, name] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+                let [ptr, nth_parent, name] =
+                    this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let nth_parent = this.read_scalar(nth_parent)?.to_u8()?;
                 let name = this.read_immediate(name)?;
@@ -334,7 +335,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.give_pointer_debug_name(ptr, nth_parent, &name)?;
             }
             "miri_static_root" => {
-                let [ptr] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+                let [ptr] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let (alloc_id, offset, _) = this.ptr_get_alloc_id(ptr, 0)?;
                 if offset != Size::ZERO {
@@ -345,7 +346,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.machine.static_roots.push(alloc_id);
             }
             "miri_host_to_target_path" => {
-                let [ptr, out, out_size] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+                let [ptr, out, out_size] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let out = this.read_pointer(out)?;
                 let out_size = this.read_scalar(out_size)?.to_target_usize(this)?;
@@ -381,7 +382,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Writes some bytes to the interpreter's stdout/stderr. See the
             // README for details.
             "miri_write_to_stdout" | "miri_write_to_stderr" => {
-                let [msg] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+                let [msg] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                 let msg = this.read_immediate(msg)?;
                 let msg = this.read_byte_slice(&msg)?;
                 // Note: we're ignoring errors writing to host stdout/stderr.
@@ -395,7 +396,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
             "miri_promise_symbolic_alignment" => {
                 use rustc_abi::AlignFromBytesError;
 
-                let [ptr, align] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+                let [ptr, align] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let align = this.read_target_usize(align)?;
                 if !align.is_power_of_two() {
@@ -436,12 +437,12 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // Aborting the process.
             "exit" => {
-                let [code] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [code] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let code = this.read_scalar(code)?.to_i32()?;
                 throw_machine_stop!(TerminationInfo::Exit { code, leak_check: false });
             }
             "abort" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 throw_machine_stop!(TerminationInfo::Abort(
                     "the program aborted execution".to_owned()
                 ))
@@ -449,7 +450,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // Standard C allocation
             "malloc" => {
-                let [size] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [size] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let size = this.read_target_usize(size)?;
                 if size <= this.max_size_of_val().bytes() {
                     let res = this.malloc(size, AllocInit::Uninit)?;
@@ -463,7 +464,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 }
             }
             "calloc" => {
-                let [items, elem_size] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [items, elem_size] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let items = this.read_target_usize(items)?;
                 let elem_size = this.read_target_usize(elem_size)?;
                 if let Some(size) = this.compute_size_in_bytes(Size::from_bytes(elem_size), items) {
@@ -478,12 +479,12 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 }
             }
             "free" => {
-                let [ptr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 this.free(ptr)?;
             }
             "realloc" => {
-                let [old_ptr, new_size] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [old_ptr, new_size] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let old_ptr = this.read_pointer(old_ptr)?;
                 let new_size = this.read_target_usize(new_size)?;
                 if new_size <= this.max_size_of_val().bytes() {
@@ -503,7 +504,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 let default = |ecx: &mut MiriInterpCx<'tcx>| {
                     // Only call `check_shim` when `#[global_allocator]` isn't used. When that
                     // macro is used, we act like no shim exists, so that the exported function can run.
-                    let [size, align] = ecx.check_shim(abi, Conv::Rust, link_name, args)?;
+                    let [size, align] = ecx.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                     let size = ecx.read_target_usize(size)?;
                     let align = ecx.read_target_usize(align)?;
 
@@ -536,7 +537,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 return this.emulate_allocator(|this| {
                     // See the comment for `__rust_alloc` why `check_shim` is only called in the
                     // default case.
-                    let [size, align] = this.check_shim(abi, Conv::Rust, link_name, args)?;
+                    let [size, align] = this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                     let size = this.read_target_usize(size)?;
                     let align = this.read_target_usize(align)?;
 
@@ -558,7 +559,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     // See the comment for `__rust_alloc` why `check_shim` is only called in the
                     // default case.
                     let [ptr, old_size, align] =
-                        ecx.check_shim(abi, Conv::Rust, link_name, args)?;
+                        ecx.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                     let ptr = ecx.read_pointer(ptr)?;
                     let old_size = ecx.read_target_usize(old_size)?;
                     let align = ecx.read_target_usize(align)?;
@@ -589,7 +590,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     // See the comment for `__rust_alloc` why `check_shim` is only called in the
                     // default case.
                     let [ptr, old_size, align, new_size] =
-                        this.check_shim(abi, Conv::Rust, link_name, args)?;
+                        this.check_shim(abi, CanonAbi::Rust, link_name, args)?;
                     let ptr = this.read_pointer(ptr)?;
                     let old_size = this.read_target_usize(old_size)?;
                     let align = this.read_target_usize(align)?;
@@ -613,7 +614,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // C memory handling functions
             "memcmp" => {
-                let [left, right, n] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, n] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let left = this.read_pointer(left)?;
                 let right = this.read_pointer(right)?;
                 let n = Size::from_bytes(this.read_target_usize(n)?);
@@ -637,7 +638,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(Scalar::from_i32(result), dest)?;
             }
             "memrchr" => {
-                let [ptr, val, num] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr, val, num] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let val = this.read_scalar(val)?.to_i32()?;
                 let num = this.read_target_usize(num)?;
@@ -663,7 +664,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 }
             }
             "memchr" => {
-                let [ptr, val, num] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr, val, num] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let val = this.read_scalar(val)?.to_i32()?;
                 let num = this.read_target_usize(num)?;
@@ -686,7 +687,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 }
             }
             "strlen" => {
-                let [ptr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 // This reads at least 1 byte, so we are already enforcing that this is a valid pointer.
                 let n = this.read_c_str(ptr)?.len();
@@ -696,7 +697,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 )?;
             }
             "wcslen" => {
-                let [ptr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 // This reads at least 1 byte, so we are already enforcing that this is a valid pointer.
                 let n = this.read_wchar_t_str(ptr)?.len();
@@ -706,7 +707,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 )?;
             }
             "memcpy" => {
-                let [ptr_dest, ptr_src, n] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr_dest, ptr_src, n] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let ptr_dest = this.read_pointer(ptr_dest)?;
                 let ptr_src = this.read_pointer(ptr_src)?;
                 let n = this.read_target_usize(n)?;
@@ -720,7 +721,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_pointer(ptr_dest, dest)?;
             }
             "strcpy" => {
-                let [ptr_dest, ptr_src] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr_dest, ptr_src] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let ptr_dest = this.read_pointer(ptr_dest)?;
                 let ptr_src = this.read_pointer(ptr_src)?;
 
@@ -751,7 +752,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
             | "erff"
             | "erfcf"
             => {
-                let [f] = this.check_shim(abi, Conv::C , link_name, args)?;
+                let [f] = this.check_shim(abi, CanonAbi::C , link_name, args)?;
                 let f = this.read_scalar(f)?.to_f32()?;
                 // Using host floats (but it's fine, these operations do not have guaranteed precision).
                 let f_host = f.to_host();
@@ -789,7 +790,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
             | "atan2f"
             | "fdimf"
             => {
-                let [f1, f2] = this.check_shim(abi, Conv::C , link_name, args)?;
+                let [f1, f2] = this.check_shim(abi, CanonAbi::C , link_name, args)?;
                 let f1 = this.read_scalar(f1)?.to_f32()?;
                 let f2 = this.read_scalar(f2)?.to_f32()?;
                 // underscore case for windows, here and below
@@ -828,7 +829,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
             | "erf"
             | "erfc"
             => {
-                let [f] = this.check_shim(abi, Conv::C , link_name, args)?;
+                let [f] = this.check_shim(abi, CanonAbi::C , link_name, args)?;
                 let f = this.read_scalar(f)?.to_f64()?;
                 // Using host floats (but it's fine, these operations do not have guaranteed precision).
                 let f_host = f.to_host();
@@ -866,7 +867,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
             | "atan2"
             | "fdim"
             => {
-                let [f1, f2] = this.check_shim(abi, Conv::C , link_name, args)?;
+                let [f1, f2] = this.check_shim(abi, CanonAbi::C , link_name, args)?;
                 let f1 = this.read_scalar(f1)?.to_f64()?;
                 let f2 = this.read_scalar(f2)?.to_f64()?;
                 // underscore case for windows, here and below
@@ -895,7 +896,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
             | "ldexp"
             | "scalbn"
             => {
-                let [x, exp] = this.check_shim(abi, Conv::C , link_name, args)?;
+                let [x, exp] = this.check_shim(abi, CanonAbi::C , link_name, args)?;
                 // For radix-2 (binary) systems, `ldexp` and `scalbn` are the same.
                 let x = this.read_scalar(x)?.to_f64()?;
                 let exp = this.read_scalar(exp)?.to_i32()?;
@@ -905,7 +906,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(res, dest)?;
             }
             "lgammaf_r" => {
-                let [x, signp] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [x, signp] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let x = this.read_scalar(x)?.to_f32()?;
                 let signp = this.deref_pointer_as(signp, this.machine.layouts.i32)?;
 
@@ -921,7 +922,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(res, dest)?;
             }
             "lgamma_r" => {
-                let [x, signp] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [x, signp] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let x = this.read_scalar(x)?.to_f64()?;
                 let signp = this.deref_pointer_as(signp, this.machine.layouts.i32)?;
 
@@ -939,7 +940,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // LLVM intrinsics
             "llvm.prefetch" => {
-                let [p, rw, loc, ty] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [p, rw, loc, ty] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let _ = this.read_pointer(p)?;
                 let rw = this.read_scalar(rw)?.to_i32()?;
@@ -966,7 +967,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Used to implement the x86 `_mm{,256,512}_popcnt_epi{8,16,32,64}` and wasm
             // `{i,u}8x16_popcnt` functions.
             name if name.starts_with("llvm.ctpop.v") => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (op, op_len) = this.project_to_simd(op)?;
                 let (dest, dest_len) = this.project_to_simd(dest)?;
@@ -1002,7 +1003,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
             // FIXME: Move this to an `arm` submodule.
             "llvm.arm.hint" if this.tcx.sess.target.arch == "arm" => {
-                let [arg] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [arg] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let arg = this.read_scalar(arg)?.to_i32()?;
                 // Note that different arguments might have different target feature requirements.
                 match arg {
diff --git a/src/tools/miri/src/shims/unix/android/foreign_items.rs b/src/tools/miri/src/shims/unix/android/foreign_items.rs
index 0e7cf7153f5..690b5295681 100644
--- a/src/tools/miri/src/shims/unix/android/foreign_items.rs
+++ b/src/tools/miri/src/shims/unix/android/foreign_items.rs
@@ -1,6 +1,7 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::shims::unix::android::thread::prctl;
 use crate::shims::unix::linux_like::epoll::EvalContextExt as _;
@@ -25,29 +26,29 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         match link_name.as_str() {
             // epoll, eventfd
             "epoll_create1" => {
-                let [flag] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [flag] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.epoll_create1(flag)?;
                 this.write_scalar(result, dest)?;
             }
             "epoll_ctl" => {
-                let [epfd, op, fd, event] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [epfd, op, fd, event] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.epoll_ctl(epfd, op, fd, event)?;
                 this.write_scalar(result, dest)?;
             }
             "epoll_wait" => {
                 let [epfd, events, maxevents, timeout] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.epoll_wait(epfd, events, maxevents, timeout, dest)?;
             }
             "eventfd" => {
-                let [val, flag] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [val, flag] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.eventfd(val, flag)?;
                 this.write_scalar(result, dest)?;
             }
 
             // Miscellaneous
             "__errno" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let errno_place = this.last_error_place()?;
                 this.write_scalar(errno_place.to_ref(this).to_scalar(), dest)?;
             }
diff --git a/src/tools/miri/src/shims/unix/android/thread.rs b/src/tools/miri/src/shims/unix/android/thread.rs
index aa3a05ead85..5d17d6c8517 100644
--- a/src/tools/miri/src/shims/unix/android/thread.rs
+++ b/src/tools/miri/src/shims/unix/android/thread.rs
@@ -1,7 +1,7 @@
-use rustc_abi::Size;
+use rustc_abi::{CanonAbi, Size};
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::helpers::check_min_vararg_count;
 use crate::shims::unix::thread::{EvalContextExt as _, ThreadNameResult};
@@ -16,7 +16,7 @@ pub fn prctl<'tcx>(
     args: &[OpTy<'tcx>],
     dest: &MPlaceTy<'tcx>,
 ) -> InterpResult<'tcx> {
-    let ([op], varargs) = ecx.check_shim_variadic(abi, Conv::C, link_name, args)?;
+    let ([op], varargs) = ecx.check_shim_variadic(abi, CanonAbi::C, link_name, args)?;
 
     // FIXME: Use constants once https://github.com/rust-lang/libc/pull/3941 backported to the 0.2 branch.
     let pr_set_name = 15;
diff --git a/src/tools/miri/src/shims/unix/foreign_items.rs b/src/tools/miri/src/shims/unix/foreign_items.rs
index 026aa1f9503..9106ef94c43 100644
--- a/src/tools/miri/src/shims/unix/foreign_items.rs
+++ b/src/tools/miri/src/shims/unix/foreign_items.rs
@@ -1,11 +1,11 @@
 use std::ffi::OsStr;
 use std::str;
 
-use rustc_abi::{ExternAbi, Size};
+use rustc_abi::{CanonAbi, ExternAbi, Size};
 use rustc_middle::ty::Ty;
 use rustc_middle::ty::layout::LayoutOf;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use self::shims::unix::android::foreign_items as android;
 use self::shims::unix::freebsd::foreign_items as freebsd;
@@ -334,7 +334,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
             "fcntl" => {
                 let ([fd_num, cmd], varargs) =
-                    this.check_shim_variadic(abi, Conv::C, link_name, args)?;
+                    this.check_shim_variadic(abi, CanonAbi::C, link_name, args)?;
                 let result = this.fcntl(fd_num, cmd, varargs)?;
                 this.write_scalar(result, dest)?;
             }
@@ -387,7 +387,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 // `open` is variadic, the third argument is only present when the second argument
                 // has O_CREAT (or on linux O_TMPFILE, but miri doesn't support that) set
                 let ([path_raw, flag], varargs) =
-                    this.check_shim_variadic(abi, Conv::C, link_name, args)?;
+                    this.check_shim_variadic(abi, CanonAbi::C, link_name, args)?;
                 let result = this.open(path_raw, flag, varargs)?;
                 this.write_scalar(result, dest)?;
             }
@@ -701,20 +701,20 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // Allocation
             "posix_memalign" => {
-                let [memptr, align, size] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [memptr, align, size] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.posix_memalign(memptr, align, size)?;
                 this.write_scalar(result, dest)?;
             }
 
             "mmap" => {
                 let [addr, length, prot, flags, fd, offset] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let offset = this.read_scalar(offset)?.to_int(this.libc_ty_layout("off_t").size)?;
                 let ptr = this.mmap(addr, length, prot, flags, fd, offset)?;
                 this.write_scalar(ptr, dest)?;
             }
             "munmap" => {
-                let [addr, length] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [addr, length] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.munmap(addr, length)?;
                 this.write_scalar(result, dest)?;
             }
@@ -722,7 +722,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             "reallocarray" => {
                 // Currently this function does not exist on all Unixes, e.g. on macOS.
                 this.check_target_os(&["linux", "freebsd", "android"], link_name)?;
-                let [ptr, nmemb, size] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr, nmemb, size] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let nmemb = this.read_target_usize(nmemb)?;
                 let size = this.read_target_usize(size)?;
@@ -745,14 +745,14 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             "aligned_alloc" => {
                 // This is a C11 function, we assume all Unixes have it.
                 // (MSVC explicitly does not support this.)
-                let [align, size] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [align, size] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let res = this.aligned_alloc(align, size)?;
                 this.write_pointer(res, dest)?;
             }
 
             // Dynamic symbol loading
             "dlsym" => {
-                let [handle, symbol] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [handle, symbol] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.read_target_usize(handle)?;
                 let symbol = this.read_pointer(symbol)?;
                 let name = this.read_c_str(symbol)?;
@@ -768,7 +768,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // Thread-local storage
             "pthread_key_create" => {
-                let [key, dtor] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [key, dtor] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let key_place = this.deref_pointer_as(key, this.libc_ty_layout("pthread_key_t"))?;
                 let dtor = this.read_pointer(dtor)?;
 
@@ -796,21 +796,21 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_null(dest)?;
             }
             "pthread_key_delete" => {
-                let [key] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [key] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let key = this.read_scalar(key)?.to_bits(key.layout.size)?;
                 this.machine.tls.delete_tls_key(key)?;
                 // Return success (0)
                 this.write_null(dest)?;
             }
             "pthread_getspecific" => {
-                let [key] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [key] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let key = this.read_scalar(key)?.to_bits(key.layout.size)?;
                 let active_thread = this.active_thread();
                 let ptr = this.machine.tls.load_tls(key, active_thread, this)?;
                 this.write_scalar(ptr, dest)?;
             }
             "pthread_setspecific" => {
-                let [key, new_ptr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [key, new_ptr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let key = this.read_scalar(key)?.to_bits(key.layout.size)?;
                 let active_thread = this.active_thread();
                 let new_data = this.read_scalar(new_ptr)?;
@@ -822,156 +822,157 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // Synchronization primitives
             "pthread_mutexattr_init" => {
-                let [attr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [attr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_mutexattr_init(attr)?;
                 this.write_null(dest)?;
             }
             "pthread_mutexattr_settype" => {
-                let [attr, kind] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [attr, kind] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.pthread_mutexattr_settype(attr, kind)?;
                 this.write_scalar(result, dest)?;
             }
             "pthread_mutexattr_destroy" => {
-                let [attr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [attr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_mutexattr_destroy(attr)?;
                 this.write_null(dest)?;
             }
             "pthread_mutex_init" => {
-                let [mutex, attr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [mutex, attr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_mutex_init(mutex, attr)?;
                 this.write_null(dest)?;
             }
             "pthread_mutex_lock" => {
-                let [mutex] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [mutex] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_mutex_lock(mutex, dest)?;
             }
             "pthread_mutex_trylock" => {
-                let [mutex] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [mutex] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.pthread_mutex_trylock(mutex)?;
                 this.write_scalar(result, dest)?;
             }
             "pthread_mutex_unlock" => {
-                let [mutex] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [mutex] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.pthread_mutex_unlock(mutex)?;
                 this.write_scalar(result, dest)?;
             }
             "pthread_mutex_destroy" => {
-                let [mutex] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [mutex] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_mutex_destroy(mutex)?;
                 this.write_int(0, dest)?;
             }
             "pthread_rwlock_rdlock" => {
-                let [rwlock] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [rwlock] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_rwlock_rdlock(rwlock, dest)?;
             }
             "pthread_rwlock_tryrdlock" => {
-                let [rwlock] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [rwlock] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.pthread_rwlock_tryrdlock(rwlock)?;
                 this.write_scalar(result, dest)?;
             }
             "pthread_rwlock_wrlock" => {
-                let [rwlock] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [rwlock] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_rwlock_wrlock(rwlock, dest)?;
             }
             "pthread_rwlock_trywrlock" => {
-                let [rwlock] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [rwlock] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.pthread_rwlock_trywrlock(rwlock)?;
                 this.write_scalar(result, dest)?;
             }
             "pthread_rwlock_unlock" => {
-                let [rwlock] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [rwlock] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_rwlock_unlock(rwlock)?;
                 this.write_null(dest)?;
             }
             "pthread_rwlock_destroy" => {
-                let [rwlock] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [rwlock] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_rwlock_destroy(rwlock)?;
                 this.write_null(dest)?;
             }
             "pthread_condattr_init" => {
-                let [attr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [attr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_condattr_init(attr)?;
                 this.write_null(dest)?;
             }
             "pthread_condattr_setclock" => {
-                let [attr, clock_id] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [attr, clock_id] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.pthread_condattr_setclock(attr, clock_id)?;
                 this.write_scalar(result, dest)?;
             }
             "pthread_condattr_getclock" => {
-                let [attr, clock_id] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [attr, clock_id] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_condattr_getclock(attr, clock_id)?;
                 this.write_null(dest)?;
             }
             "pthread_condattr_destroy" => {
-                let [attr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [attr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_condattr_destroy(attr)?;
                 this.write_null(dest)?;
             }
             "pthread_cond_init" => {
-                let [cond, attr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [cond, attr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_cond_init(cond, attr)?;
                 this.write_null(dest)?;
             }
             "pthread_cond_signal" => {
-                let [cond] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [cond] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_cond_signal(cond)?;
                 this.write_null(dest)?;
             }
             "pthread_cond_broadcast" => {
-                let [cond] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [cond] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_cond_broadcast(cond)?;
                 this.write_null(dest)?;
             }
             "pthread_cond_wait" => {
-                let [cond, mutex] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [cond, mutex] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_cond_wait(cond, mutex, dest)?;
             }
             "pthread_cond_timedwait" => {
-                let [cond, mutex, abstime] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [cond, mutex, abstime] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_cond_timedwait(cond, mutex, abstime, dest)?;
             }
             "pthread_cond_destroy" => {
-                let [cond] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [cond] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_cond_destroy(cond)?;
                 this.write_null(dest)?;
             }
 
             // Threading
             "pthread_create" => {
-                let [thread, attr, start, arg] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread, attr, start, arg] =
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.pthread_create(thread, attr, start, arg)?;
                 this.write_null(dest)?;
             }
             "pthread_join" => {
-                let [thread, retval] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread, retval] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let res = this.pthread_join(thread, retval)?;
                 this.write_scalar(res, dest)?;
             }
             "pthread_detach" => {
-                let [thread] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let res = this.pthread_detach(thread)?;
                 this.write_scalar(res, dest)?;
             }
             "pthread_self" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let res = this.pthread_self()?;
                 this.write_scalar(res, dest)?;
             }
             "sched_yield" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.sched_yield()?;
                 this.write_null(dest)?;
             }
             "nanosleep" => {
-                let [req, rem] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [req, rem] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.nanosleep(req, rem)?;
                 this.write_scalar(result, dest)?;
             }
             "sched_getaffinity" => {
                 // Currently this function does not exist on all Unixes, e.g. on macOS.
                 this.check_target_os(&["linux", "freebsd", "android"], link_name)?;
-                let [pid, cpusetsize, mask] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [pid, cpusetsize, mask] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let pid = this.read_scalar(pid)?.to_u32()?;
                 let cpusetsize = this.read_target_usize(cpusetsize)?;
                 let mask = this.read_pointer(mask)?;
@@ -1008,7 +1009,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             "sched_setaffinity" => {
                 // Currently this function does not exist on all Unixes, e.g. on macOS.
                 this.check_target_os(&["linux", "freebsd", "android"], link_name)?;
-                let [pid, cpusetsize, mask] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [pid, cpusetsize, mask] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let pid = this.read_scalar(pid)?.to_u32()?;
                 let cpusetsize = this.read_target_usize(cpusetsize)?;
                 let mask = this.read_pointer(mask)?;
@@ -1048,12 +1049,13 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // Miscellaneous
             "isatty" => {
-                let [fd] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [fd] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.isatty(fd)?;
                 this.write_scalar(result, dest)?;
             }
             "pthread_atfork" => {
-                let [prepare, parent, child] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [prepare, parent, child] =
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.read_pointer(prepare)?;
                 this.read_pointer(parent)?;
                 this.read_pointer(child)?;
@@ -1067,7 +1069,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     &["linux", "macos", "freebsd", "illumos", "solaris", "android"],
                     link_name,
                 )?;
-                let [buf, bufsize] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [buf, bufsize] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let buf = this.read_pointer(buf)?;
                 let bufsize = this.read_target_usize(bufsize)?;
 
@@ -1085,7 +1087,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
 
             "strerror_r" => {
-                let [errnum, buf, buflen] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [errnum, buf, buflen] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.strerror_r(errnum, buf, buflen)?;
                 this.write_scalar(result, dest)?;
             }
@@ -1097,7 +1099,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     &["linux", "freebsd", "illumos", "solaris", "android"],
                     link_name,
                 )?;
-                let [ptr, len, flags] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr, len, flags] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let len = this.read_target_usize(len)?;
                 let _flags = this.read_scalar(flags)?.to_i32()?;
@@ -1109,7 +1111,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 // This function is non-standard but exists with the same signature and
                 // same behavior (eg never fails) on FreeBSD and Solaris/Illumos.
                 this.check_target_os(&["freebsd", "illumos", "solaris"], link_name)?;
-                let [ptr, len] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr, len] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
                 let len = this.read_target_usize(len)?;
                 this.gen_random(ptr, len)?;
@@ -1133,12 +1135,12 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     link_name,
                 )?;
                 // This function looks and behaves excatly like miri_start_unwind.
-                let [payload] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [payload] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.handle_miri_start_unwind(payload)?;
                 return interp_ok(EmulateItemResult::NeedsUnwind);
             }
             "getuid" | "geteuid" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 // For now, just pretend we always have this fixed UID.
                 this.write_int(UID, dest)?;
             }
@@ -1146,7 +1148,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Incomplete shims that we "stub out" just to get pre-main initialization code to work.
             // These shims are enabled only when the caller is in the standard library.
             "pthread_attr_getguardsize" if this.frame_in_std() => {
-                let [_attr, guard_size] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [_attr, guard_size] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let guard_size_layout = this.machine.layouts.usize;
                 let guard_size = this.deref_pointer_as(guard_size, guard_size_layout)?;
                 this.write_scalar(
@@ -1159,11 +1161,11 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
 
             "pthread_attr_init" | "pthread_attr_destroy" if this.frame_in_std() => {
-                let [_] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [_] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.write_null(dest)?;
             }
             "pthread_attr_setstacksize" if this.frame_in_std() => {
-                let [_, _] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [_, _] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.write_null(dest)?;
             }
 
@@ -1171,7 +1173,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 // We don't support "pthread_attr_setstack", so we just pretend all stacks have the same values here.
                 // Hence we can mostly ignore the input `attr_place`.
                 let [attr_place, addr_place, size_place] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let _attr_place =
                     this.deref_pointer_as(attr_place, this.libc_ty_layout("pthread_attr_t"))?;
                 let addr_place = this.deref_pointer_as(addr_place, this.machine.layouts.usize)?;
@@ -1191,18 +1193,18 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
 
             "signal" | "sigaltstack" if this.frame_in_std() => {
-                let [_, _] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [_, _] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.write_null(dest)?;
             }
             "sigaction" | "mprotect" if this.frame_in_std() => {
-                let [_, _, _] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [_, _, _] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.write_null(dest)?;
             }
 
             "getpwuid_r" | "__posix_getpwuid_r" if this.frame_in_std() => {
                 // getpwuid_r is the standard name, __posix_getpwuid_r is used on solarish
                 let [uid, pwd, buf, buflen, result] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.check_no_isolation("`getpwuid_r`")?;
 
                 let uid = this.read_scalar(uid)?.to_u32()?;
diff --git a/src/tools/miri/src/shims/unix/freebsd/foreign_items.rs b/src/tools/miri/src/shims/unix/freebsd/foreign_items.rs
index 533a741fea3..42502d5bf09 100644
--- a/src/tools/miri/src/shims/unix/freebsd/foreign_items.rs
+++ b/src/tools/miri/src/shims/unix/freebsd/foreign_items.rs
@@ -1,6 +1,7 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use super::sync::EvalContextExt as _;
 use crate::shims::unix::*;
@@ -23,7 +24,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         match link_name.as_str() {
             // Threading
             "pthread_setname_np" => {
-                let [thread, name] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread, name] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let max_len = u64::MAX; // FreeBSD does not seem to have a limit.
                 let res = match this.pthread_setname_np(
                     this.read_scalar(thread)?,
@@ -38,7 +39,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(res, dest)?;
             }
             "pthread_getname_np" => {
-                let [thread, name, len] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread, name, len] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 // FreeBSD's pthread_getname_np uses strlcpy, which truncates the resulting value,
                 // but always adds a null terminator (except for zero-sized buffers).
                 // https://github.com/freebsd/freebsd-src/blob/c2d93a803acef634bd0eede6673aeea59e90c277/lib/libthr/thread/thr_info.c#L119-L144
@@ -59,7 +60,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             "cpuset_getaffinity" => {
                 // The "same" kind of api as `sched_getaffinity` but more fine grained control for FreeBSD specifically.
                 let [level, which, id, set_size, mask] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let level = this.read_scalar(level)?.to_i32()?;
                 let which = this.read_scalar(which)?.to_i32()?;
@@ -123,7 +124,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Synchronization primitives
             "_umtx_op" => {
                 let [obj, op, val, uaddr, uaddr2] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this._umtx_op(obj, op, val, uaddr, uaddr2, dest)?;
             }
 
@@ -131,29 +132,29 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // For those, we both intercept `func` and `call@FBSD_1.0` symbols cases
             // since freebsd 12 the former form can be expected.
             "stat" | "stat@FBSD_1.0" => {
-                let [path, buf] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [path, buf] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_solarish_stat(path, buf)?;
                 this.write_scalar(result, dest)?;
             }
             "lstat" | "lstat@FBSD_1.0" => {
-                let [path, buf] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [path, buf] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_solarish_lstat(path, buf)?;
                 this.write_scalar(result, dest)?;
             }
             "fstat" | "fstat@FBSD_1.0" => {
-                let [fd, buf] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [fd, buf] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_solarish_fstat(fd, buf)?;
                 this.write_scalar(result, dest)?;
             }
             "readdir_r" | "readdir_r@FBSD_1.0" => {
-                let [dirp, entry, result] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [dirp, entry, result] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_readdir_r(dirp, entry, result)?;
                 this.write_scalar(result, dest)?;
             }
 
             // Miscellaneous
             "__error" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let errno_place = this.last_error_place()?;
                 this.write_scalar(errno_place.to_ref(this).to_scalar(), dest)?;
             }
@@ -161,7 +162,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Incomplete shims that we "stub out" just to get pre-main initialization code to work.
             // These shims are enabled only when the caller is in the standard library.
             "pthread_attr_get_np" if this.frame_in_std() => {
-                let [_thread, _attr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [_thread, _attr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.write_null(dest)?;
             }
 
diff --git a/src/tools/miri/src/shims/unix/linux/foreign_items.rs b/src/tools/miri/src/shims/unix/linux/foreign_items.rs
index 51c2434d68a..aeaff1cb13a 100644
--- a/src/tools/miri/src/shims/unix/linux/foreign_items.rs
+++ b/src/tools/miri/src/shims/unix/linux/foreign_items.rs
@@ -1,6 +1,7 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use self::shims::unix::linux::mem::EvalContextExt as _;
 use self::shims::unix::linux_like::epoll::EvalContextExt as _;
@@ -36,47 +37,48 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         match link_name.as_str() {
             // File related shims
             "readdir64" => {
-                let [dirp] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [dirp] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.linux_solarish_readdir64("dirent64", dirp)?;
                 this.write_scalar(result, dest)?;
             }
             "sync_file_range" => {
-                let [fd, offset, nbytes, flags] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [fd, offset, nbytes, flags] =
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.sync_file_range(fd, offset, nbytes, flags)?;
                 this.write_scalar(result, dest)?;
             }
             "statx" => {
                 let [dirfd, pathname, flags, mask, statxbuf] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.linux_statx(dirfd, pathname, flags, mask, statxbuf)?;
                 this.write_scalar(result, dest)?;
             }
 
             // epoll, eventfd
             "epoll_create1" => {
-                let [flag] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [flag] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.epoll_create1(flag)?;
                 this.write_scalar(result, dest)?;
             }
             "epoll_ctl" => {
-                let [epfd, op, fd, event] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [epfd, op, fd, event] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.epoll_ctl(epfd, op, fd, event)?;
                 this.write_scalar(result, dest)?;
             }
             "epoll_wait" => {
                 let [epfd, events, maxevents, timeout] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.epoll_wait(epfd, events, maxevents, timeout, dest)?;
             }
             "eventfd" => {
-                let [val, flag] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [val, flag] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.eventfd(val, flag)?;
                 this.write_scalar(result, dest)?;
             }
 
             // Threading
             "pthread_setname_np" => {
-                let [thread, name] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread, name] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let res = match this.pthread_setname_np(
                     this.read_scalar(thread)?,
                     this.read_scalar(name)?,
@@ -91,7 +93,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(res, dest)?;
             }
             "pthread_getname_np" => {
-                let [thread, name, len] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread, name, len] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 // The function's behavior isn't portable between platforms.
                 // In case of glibc, the length of the output buffer must
                 // be not shorter than TASK_COMM_LEN.
@@ -114,7 +116,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(res, dest)?;
             }
             "gettid" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.linux_gettid()?;
                 this.write_scalar(result, dest)?;
             }
@@ -127,34 +129,34 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Miscellaneous
             "mmap64" => {
                 let [addr, length, prot, flags, fd, offset] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let offset = this.read_scalar(offset)?.to_i64()?;
                 let ptr = this.mmap(addr, length, prot, flags, fd, offset.into())?;
                 this.write_scalar(ptr, dest)?;
             }
             "mremap" => {
                 let ([old_address, old_size, new_size, flags], _) =
-                    this.check_shim_variadic(abi, Conv::C, link_name, args)?;
+                    this.check_shim_variadic(abi, CanonAbi::C, link_name, args)?;
                 let ptr = this.mremap(old_address, old_size, new_size, flags)?;
                 this.write_scalar(ptr, dest)?;
             }
             "__xpg_strerror_r" => {
-                let [errnum, buf, buflen] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [errnum, buf, buflen] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.strerror_r(errnum, buf, buflen)?;
                 this.write_scalar(result, dest)?;
             }
             "__errno_location" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let errno_place = this.last_error_place()?;
                 this.write_scalar(errno_place.to_ref(this).to_scalar(), dest)?;
             }
             "__libc_current_sigrtmin" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 this.write_int(SIGRTMIN, dest)?;
             }
             "__libc_current_sigrtmax" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 this.write_int(SIGRTMAX, dest)?;
             }
@@ -162,7 +164,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Incomplete shims that we "stub out" just to get pre-main initialization code to work.
             // These shims are enabled only when the caller is in the standard library.
             "pthread_getattr_np" if this.frame_in_std() => {
-                let [_thread, _attr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [_thread, _attr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.write_null(dest)?;
             }
 
diff --git a/src/tools/miri/src/shims/unix/linux_like/syscall.rs b/src/tools/miri/src/shims/unix/linux_like/syscall.rs
index 22c6dc97507..d42d6b9073e 100644
--- a/src/tools/miri/src/shims/unix/linux_like/syscall.rs
+++ b/src/tools/miri/src/shims/unix/linux_like/syscall.rs
@@ -1,6 +1,7 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::helpers::check_min_vararg_count;
 use crate::shims::unix::linux_like::eventfd::EvalContextExt as _;
@@ -14,7 +15,7 @@ pub fn syscall<'tcx>(
     args: &[OpTy<'tcx>],
     dest: &MPlaceTy<'tcx>,
 ) -> InterpResult<'tcx> {
-    let ([op], varargs) = ecx.check_shim_variadic(abi, Conv::C, link_name, args)?;
+    let ([op], varargs) = ecx.check_shim_variadic(abi, CanonAbi::C, link_name, args)?;
     // The syscall variadic function is legal to call with more arguments than needed,
     // extra arguments are simply ignored. The important check is that when we use an
     // argument, we have to also check all arguments *before* it to ensure that they
diff --git a/src/tools/miri/src/shims/unix/macos/foreign_items.rs b/src/tools/miri/src/shims/unix/macos/foreign_items.rs
index 0281bb9f71d..ae921a013a4 100644
--- a/src/tools/miri/src/shims/unix/macos/foreign_items.rs
+++ b/src/tools/miri/src/shims/unix/macos/foreign_items.rs
@@ -1,6 +1,7 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use super::sync::{EvalContextExt as _, MacOsFutexTimeout};
 use crate::shims::unix::*;
@@ -34,64 +35,64 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         match link_name.as_str() {
             // errno
             "__error" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let errno_place = this.last_error_place()?;
                 this.write_scalar(errno_place.to_ref(this).to_scalar(), dest)?;
             }
 
             // File related shims
             "close$NOCANCEL" => {
-                let [result] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [result] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.close(result)?;
                 this.write_scalar(result, dest)?;
             }
             "stat" | "stat64" | "stat$INODE64" => {
-                let [path, buf] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [path, buf] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_solarish_stat(path, buf)?;
                 this.write_scalar(result, dest)?;
             }
             "lstat" | "lstat64" | "lstat$INODE64" => {
-                let [path, buf] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [path, buf] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_solarish_lstat(path, buf)?;
                 this.write_scalar(result, dest)?;
             }
             "fstat" | "fstat64" | "fstat$INODE64" => {
-                let [fd, buf] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [fd, buf] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_solarish_fstat(fd, buf)?;
                 this.write_scalar(result, dest)?;
             }
             "opendir$INODE64" => {
-                let [name] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [name] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.opendir(name)?;
                 this.write_scalar(result, dest)?;
             }
             "readdir_r" | "readdir_r$INODE64" => {
-                let [dirp, entry, result] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [dirp, entry, result] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_readdir_r(dirp, entry, result)?;
                 this.write_scalar(result, dest)?;
             }
             "realpath$DARWIN_EXTSN" => {
-                let [path, resolved_path] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [path, resolved_path] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.realpath(path, resolved_path)?;
                 this.write_scalar(result, dest)?;
             }
             "ioctl" => {
                 let ([fd_num, cmd], varargs) =
-                    this.check_shim_variadic(abi, Conv::C, link_name, args)?;
+                    this.check_shim_variadic(abi, CanonAbi::C, link_name, args)?;
                 let result = this.ioctl(fd_num, cmd, varargs)?;
                 this.write_scalar(result, dest)?;
             }
 
             // Environment related shims
             "_NSGetEnviron" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let environ = this.machine.env_vars.unix().environ();
                 this.write_pointer(environ, dest)?;
             }
 
             // Random data generation
             "CCRandomGenerateBytes" => {
-                let [bytes, count] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [bytes, count] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let bytes = this.read_pointer(bytes)?;
                 let count = this.read_target_usize(count)?;
                 let success = this.eval_libc_i32("kCCSuccess");
@@ -101,28 +102,28 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // Time related shims
             "mach_absolute_time" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.mach_absolute_time()?;
                 this.write_scalar(result, dest)?;
             }
 
             "mach_timebase_info" => {
-                let [info] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [info] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.mach_timebase_info(info)?;
                 this.write_scalar(result, dest)?;
             }
 
             // Access to command-line arguments
             "_NSGetArgc" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.write_pointer(this.machine.argc.expect("machine must be initialized"), dest)?;
             }
             "_NSGetArgv" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.write_pointer(this.machine.argv.expect("machine must be initialized"), dest)?;
             }
             "_NSGetExecutablePath" => {
-                let [buf, bufsize] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [buf, bufsize] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.check_no_isolation("`_NSGetExecutablePath`")?;
 
                 let buf_ptr = this.read_pointer(buf)?;
@@ -147,7 +148,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // Thread-local storage
             "_tlv_atexit" => {
-                let [dtor, data] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [dtor, data] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let dtor = this.read_pointer(dtor)?;
                 let dtor = this.get_ptr_fn(dtor)?.as_instance()?;
                 let data = this.read_scalar(data)?;
@@ -157,13 +158,13 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // Querying system information
             "pthread_get_stackaddr_np" => {
-                let [thread] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.read_target_usize(thread)?;
                 let stack_addr = Scalar::from_uint(this.machine.stack_addr, this.pointer_size());
                 this.write_scalar(stack_addr, dest)?;
             }
             "pthread_get_stacksize_np" => {
-                let [thread] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.read_target_usize(thread)?;
                 let stack_size = Scalar::from_uint(this.machine.stack_size, this.pointer_size());
                 this.write_scalar(stack_size, dest)?;
@@ -171,7 +172,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // Threading
             "pthread_setname_np" => {
-                let [name] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [name] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 // The real implementation has logic in two places:
                 // * in userland at https://github.com/apple-oss-distributions/libpthread/blob/c032e0b076700a0a47db75528a282b8d3a06531a/src/pthread.c#L1178-L1200,
@@ -198,7 +199,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(res, dest)?;
             }
             "pthread_getname_np" => {
-                let [thread, name, len] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread, name, len] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 // The function's behavior isn't portable between platforms.
                 // In case of macOS, a truncated name (due to a too small buffer)
@@ -225,7 +226,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Synchronization primitives
             "os_sync_wait_on_address" => {
                 let [addr_op, value_op, size_op, flags_op] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.os_sync_wait_on_address(
                     addr_op,
                     value_op,
@@ -237,7 +238,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
             "os_sync_wait_on_address_with_deadline" => {
                 let [addr_op, value_op, size_op, flags_op, clock_op, timeout_op] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.os_sync_wait_on_address(
                     addr_op,
                     value_op,
@@ -249,7 +250,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
             "os_sync_wait_on_address_with_timeout" => {
                 let [addr_op, value_op, size_op, flags_op, clock_op, timeout_op] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.os_sync_wait_on_address(
                     addr_op,
                     value_op,
@@ -261,36 +262,36 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
             "os_sync_wake_by_address_any" => {
                 let [addr_op, size_op, flags_op] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.os_sync_wake_by_address(
                     addr_op, size_op, flags_op, /* all */ false, dest,
                 )?;
             }
             "os_sync_wake_by_address_all" => {
                 let [addr_op, size_op, flags_op] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.os_sync_wake_by_address(
                     addr_op, size_op, flags_op, /* all */ true, dest,
                 )?;
             }
             "os_unfair_lock_lock" => {
-                let [lock_op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [lock_op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.os_unfair_lock_lock(lock_op)?;
             }
             "os_unfair_lock_trylock" => {
-                let [lock_op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [lock_op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.os_unfair_lock_trylock(lock_op, dest)?;
             }
             "os_unfair_lock_unlock" => {
-                let [lock_op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [lock_op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.os_unfair_lock_unlock(lock_op)?;
             }
             "os_unfair_lock_assert_owner" => {
-                let [lock_op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [lock_op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.os_unfair_lock_assert_owner(lock_op)?;
             }
             "os_unfair_lock_assert_not_owner" => {
-                let [lock_op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [lock_op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.os_unfair_lock_assert_not_owner(lock_op)?;
             }
 
diff --git a/src/tools/miri/src/shims/unix/solarish/foreign_items.rs b/src/tools/miri/src/shims/unix/solarish/foreign_items.rs
index 21d4f41f485..e3d15b89be6 100644
--- a/src/tools/miri/src/shims/unix/solarish/foreign_items.rs
+++ b/src/tools/miri/src/shims/unix/solarish/foreign_items.rs
@@ -1,6 +1,7 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::shims::unix::foreign_items::EvalContextExt as _;
 use crate::shims::unix::linux_like::epoll::EvalContextExt as _;
@@ -26,32 +27,32 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // epoll, eventfd (NOT available on Solaris!)
             "epoll_create1" => {
                 this.assert_target_os("illumos", "epoll_create1");
-                let [flag] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [flag] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.epoll_create1(flag)?;
                 this.write_scalar(result, dest)?;
             }
             "epoll_ctl" => {
                 this.assert_target_os("illumos", "epoll_ctl");
-                let [epfd, op, fd, event] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [epfd, op, fd, event] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.epoll_ctl(epfd, op, fd, event)?;
                 this.write_scalar(result, dest)?;
             }
             "epoll_wait" => {
                 this.assert_target_os("illumos", "epoll_wait");
                 let [epfd, events, maxevents, timeout] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.epoll_wait(epfd, events, maxevents, timeout, dest)?;
             }
             "eventfd" => {
                 this.assert_target_os("illumos", "eventfd");
-                let [val, flag] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [val, flag] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.eventfd(val, flag)?;
                 this.write_scalar(result, dest)?;
             }
 
             // Threading
             "pthread_setname_np" => {
-                let [thread, name] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread, name] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 // THREAD_NAME_MAX allows a thread name of 31+1 length
                 // https://github.com/illumos/illumos-gate/blob/7671517e13b8123748eda4ef1ee165c6d9dba7fe/usr/src/uts/common/sys/thread.h#L613
                 let max_len = 32;
@@ -69,7 +70,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(res, dest)?;
             }
             "pthread_getname_np" => {
-                let [thread, name, len] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [thread, name, len] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 // See https://illumos.org/man/3C/pthread_getname_np for the error codes.
                 let res = match this.pthread_getname_np(
                     this.read_scalar(thread)?,
@@ -86,22 +87,22 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             // File related shims
             "stat" | "stat64" => {
-                let [path, buf] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [path, buf] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_solarish_stat(path, buf)?;
                 this.write_scalar(result, dest)?;
             }
             "lstat" | "lstat64" => {
-                let [path, buf] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [path, buf] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_solarish_lstat(path, buf)?;
                 this.write_scalar(result, dest)?;
             }
             "fstat" | "fstat64" => {
-                let [fd, buf] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [fd, buf] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.macos_fbsd_solarish_fstat(fd, buf)?;
                 this.write_scalar(result, dest)?;
             }
             "readdir" => {
-                let [dirp] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [dirp] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.linux_solarish_readdir64("dirent", dirp)?;
                 this.write_scalar(result, dest)?;
             }
@@ -109,20 +110,20 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Sockets and pipes
             "__xnet_socketpair" => {
                 let [domain, type_, protocol, sv] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.socketpair(domain, type_, protocol, sv)?;
                 this.write_scalar(result, dest)?;
             }
 
             // Miscellaneous
             "___errno" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let errno_place = this.last_error_place()?;
                 this.write_scalar(errno_place.to_ref(this).to_scalar(), dest)?;
             }
 
             "stack_getbounds" => {
-                let [stack] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [stack] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let stack = this.deref_pointer_as(stack, this.libc_ty_layout("stack_t"))?;
 
                 this.write_int_fields_named(
@@ -140,7 +141,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
 
             "pset_info" => {
-                let [pset, tpe, cpus, list] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [pset, tpe, cpus, list] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 // We do not need to handle the current process cpu mask, available_parallelism
                 // implementation pass null anyway. We only care for the number of
                 // cpus.
@@ -169,7 +170,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
 
             "__sysconf_xpg7" => {
-                let [val] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [val] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.sysconf(val)?;
                 this.write_scalar(result, dest)?;
             }
diff --git a/src/tools/miri/src/shims/wasi/foreign_items.rs b/src/tools/miri/src/shims/wasi/foreign_items.rs
index 90de62b9e57..8d92d0f3381 100644
--- a/src/tools/miri/src/shims/wasi/foreign_items.rs
+++ b/src/tools/miri/src/shims/wasi/foreign_items.rs
@@ -1,6 +1,7 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::shims::alloc::EvalContextExt as _;
 use crate::*;
@@ -22,12 +23,12 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         match link_name.as_str() {
             // Allocation
             "posix_memalign" => {
-                let [memptr, align, size] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [memptr, align, size] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let result = this.posix_memalign(memptr, align, size)?;
                 this.write_scalar(result, dest)?;
             }
             "aligned_alloc" => {
-                let [align, size] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [align, size] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let res = this.aligned_alloc(align, size)?;
                 this.write_pointer(res, dest)?;
             }
diff --git a/src/tools/miri/src/shims/windows/foreign_items.rs b/src/tools/miri/src/shims/windows/foreign_items.rs
index 98099e07b2e..10f6df67ad4 100644
--- a/src/tools/miri/src/shims/windows/foreign_items.rs
+++ b/src/tools/miri/src/shims/windows/foreign_items.rs
@@ -2,10 +2,10 @@ use std::ffi::OsStr;
 use std::path::{self, Path, PathBuf};
 use std::{io, iter, str};
 
-use rustc_abi::{Align, Size};
+use rustc_abi::{Align, CanonAbi, Size, X86Call};
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use self::shims::windows::handle::{Handle, PseudoHandle};
 use crate::shims::os_str::bytes_to_os_str;
@@ -140,7 +140,11 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         // https://github.com/rust-lang/rust/blob/fb00adbdb69266f10df95a4527b767b0ad35ea48/compiler/rustc_target/src/spec/mod.rs#L2766-L2768,
         // x86-32 Windows uses a different calling convention than other Windows targets
         // for the "system" ABI.
-        let sys_conv = if this.tcx.sess.target.arch == "x86" { Conv::X86Stdcall } else { Conv::C };
+        let sys_conv = if this.tcx.sess.target.arch == "x86" {
+            CanonAbi::X86(X86Call::Stdcall)
+        } else {
+            CanonAbi::C
+        };
 
         // See `fn emulate_foreign_item_inner` in `shims/foreign_items.rs` for the general pattern.
 
@@ -856,7 +860,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     );
                 }
                 // This function looks and behaves excatly like miri_start_unwind.
-                let [payload] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [payload] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 this.handle_miri_start_unwind(payload)?;
                 return interp_ok(EmulateItemResult::NeedsUnwind);
             }
diff --git a/src/tools/miri/src/shims/x86/aesni.rs b/src/tools/miri/src/shims/x86/aesni.rs
index c6784db67fb..7191284b5a3 100644
--- a/src/tools/miri/src/shims/x86/aesni.rs
+++ b/src/tools/miri/src/shims/x86/aesni.rs
@@ -1,7 +1,8 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_middle::ty::layout::LayoutOf as _;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::*;
 
@@ -26,7 +27,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // `state` with the corresponding 128-bit key of `key`.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_aesdec_si128
             "aesdec" | "aesdec.256" | "aesdec.512" => {
-                let [state, key] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [state, key] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 aes_round(this, state, key, dest, |state, key| {
                     let key = aes::Block::from(key.to_le_bytes());
                     let mut state = aes::Block::from(state.to_le_bytes());
@@ -42,7 +43,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // `state` with the corresponding 128-bit key of `key`.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_aesdeclast_si128
             "aesdeclast" | "aesdeclast.256" | "aesdeclast.512" => {
-                let [state, key] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [state, key] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 aes_round(this, state, key, dest, |state, key| {
                     let mut state = aes::Block::from(state.to_le_bytes());
@@ -66,7 +67,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // `state` with the corresponding 128-bit key of `key`.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_aesenc_si128
             "aesenc" | "aesenc.256" | "aesenc.512" => {
-                let [state, key] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [state, key] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 aes_round(this, state, key, dest, |state, key| {
                     let key = aes::Block::from(key.to_le_bytes());
                     let mut state = aes::Block::from(state.to_le_bytes());
@@ -82,7 +83,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // `state` with the corresponding 128-bit key of `key`.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_aesenclast_si128
             "aesenclast" | "aesenclast.256" | "aesenclast.512" => {
-                let [state, key] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [state, key] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 aes_round(this, state, key, dest, |state, key| {
                     let mut state = aes::Block::from(state.to_le_bytes());
                     // `aes::hazmat::cipher_round` does the following operations:
@@ -102,7 +103,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Used to implement the _mm_aesimc_si128 function.
             // Performs the AES InvMixColumns operation on `op`
             "aesimc" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 // Transmute to `u128`
                 let op = op.transmute(this.machine.layouts.u128, this)?;
                 let dest = dest.transmute(this.machine.layouts.u128, this)?;
diff --git a/src/tools/miri/src/shims/x86/avx.rs b/src/tools/miri/src/shims/x86/avx.rs
index 3aeb2b429da..37539fec748 100644
--- a/src/tools/miri/src/shims/x86/avx.rs
+++ b/src/tools/miri/src/shims/x86/avx.rs
@@ -1,9 +1,10 @@
+use rustc_abi::CanonAbi;
 use rustc_apfloat::ieee::{Double, Single};
 use rustc_middle::mir;
 use rustc_middle::ty::Ty;
 use rustc_middle::ty::layout::LayoutOf as _;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use super::{
     FloatBinOp, FloatUnaryOp, bin_op_simd_float_all, conditional_dot_product, convert_float_to_int,
@@ -33,7 +34,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // matches the IEEE min/max operations, while x86 has different
             // semantics.
             "min.ps.256" | "max.ps.256" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "min.ps.256" => FloatBinOp::Min,
@@ -45,7 +46,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
             // Used to implement _mm256_min_pd and _mm256_max_pd functions.
             "min.pd.256" | "max.pd.256" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "min.pd.256" => FloatBinOp::Min,
@@ -58,21 +59,21 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Used to implement the _mm256_round_ps function.
             // Rounds the elements of `op` according to `rounding`.
             "round.ps.256" => {
-                let [op, rounding] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op, rounding] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 round_all::<rustc_apfloat::ieee::Single>(this, op, rounding, dest)?;
             }
             // Used to implement the _mm256_round_pd function.
             // Rounds the elements of `op` according to `rounding`.
             "round.pd.256" => {
-                let [op, rounding] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op, rounding] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 round_all::<rustc_apfloat::ieee::Double>(this, op, rounding, dest)?;
             }
             // Used to implement _mm256_{rcp,rsqrt}_ps functions.
             // Performs the operations on all components of `op`.
             "rcp.ps.256" | "rsqrt.ps.256" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "rcp.ps.256" => FloatUnaryOp::Rcp,
@@ -84,7 +85,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
             // Used to implement the _mm256_dp_ps function.
             "dp.ps.256" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 conditional_dot_product(this, left, right, imm, dest)?;
             }
@@ -92,7 +93,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Horizontally add/subtract adjacent floating point values
             // in `left` and `right`.
             "hadd.ps.256" | "hadd.pd.256" | "hsub.ps.256" | "hsub.pd.256" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "hadd.ps.256" | "hadd.pd.256" => mir::BinOp::Add,
@@ -107,7 +108,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // and `right`. For each component, returns 0 if false or u32::MAX
             // if true.
             "cmp.ps.256" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which =
                     FloatBinOp::cmp_from_imm(this, this.read_scalar(imm)?.to_i8()?, link_name)?;
@@ -119,7 +120,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // and `right`. For each component, returns 0 if false or u64::MAX
             // if true.
             "cmp.pd.256" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which =
                     FloatBinOp::cmp_from_imm(this, this.read_scalar(imm)?.to_i8()?, link_name)?;
@@ -130,7 +131,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // and _mm256_cvttpd_epi32 functions.
             // Converts packed f32/f64 to packed i32.
             "cvt.ps2dq.256" | "cvtt.ps2dq.256" | "cvt.pd2dq.256" | "cvtt.pd2dq.256" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let rnd = match unprefixed_name {
                     // "current SSE rounding mode", assume nearest
@@ -148,7 +149,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // sequence of 4-element arrays, and we shuffle each of these arrays, where
             // `control` determines which element of the current `data` array is written.
             "vpermilvar.ps" | "vpermilvar.ps.256" => {
-                let [data, control] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [data, control] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (data, data_len) = this.project_to_simd(data)?;
                 let (control, control_len) = this.project_to_simd(control)?;
@@ -181,7 +182,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // where `right` determines which element of the current `left` array is
             // written.
             "vpermilvar.pd" | "vpermilvar.pd.256" => {
-                let [data, control] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [data, control] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (data, data_len) = this.project_to_simd(data)?;
                 let (control, control_len) = this.project_to_simd(control)?;
@@ -213,7 +214,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // For each 128-bit element of `dest`, copies one from `left`, `right` or
             // zero, according to `imm`.
             "vperm2f128.ps.256" | "vperm2f128.pd.256" | "vperm2f128.si.256" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 assert_eq!(dest.layout, left.layout);
                 assert_eq!(dest.layout, right.layout);
@@ -256,7 +257,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // is one, it is loaded from `ptr.wrapping_add(i)`, otherwise zero is
             // loaded.
             "maskload.ps" | "maskload.pd" | "maskload.ps.256" | "maskload.pd.256" => {
-                let [ptr, mask] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr, mask] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 mask_load(this, ptr, mask, dest)?;
             }
@@ -266,7 +267,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // is one, it is stored into `ptr.wapping_add(i)`.
             // Unlike SSE2's _mm_maskmoveu_si128, these are not non-temporal stores.
             "maskstore.ps" | "maskstore.pd" | "maskstore.ps.256" | "maskstore.pd.256" => {
-                let [ptr, mask, value] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr, mask, value] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 mask_store(this, ptr, mask, value)?;
             }
@@ -276,7 +277,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // the data crosses a cache line, but for Miri this is just a regular
             // unaligned read.
             "ldu.dq.256" => {
-                let [src_ptr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [src_ptr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let src_ptr = this.read_pointer(src_ptr)?;
                 let dest = dest.force_mplace(this)?;
 
@@ -288,7 +289,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Tests `op & mask == 0`, `op & mask == mask` or
             // `op & mask != 0 && op & mask != mask`
             "ptestz.256" | "ptestc.256" | "ptestnzc.256" => {
-                let [op, mask] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op, mask] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (all_zero, masked_set) = test_bits_masked(this, op, mask)?;
                 let res = match unprefixed_name {
@@ -311,7 +312,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             "vtestz.pd.256" | "vtestc.pd.256" | "vtestnzc.pd.256" | "vtestz.pd" | "vtestc.pd"
             | "vtestnzc.pd" | "vtestz.ps.256" | "vtestc.ps.256" | "vtestnzc.ps.256"
             | "vtestz.ps" | "vtestc.ps" | "vtestnzc.ps" => {
-                let [op, mask] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op, mask] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (direct, negated) = test_high_bits_masked(this, op, mask)?;
                 let res = match unprefixed_name {
@@ -333,7 +334,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 // compiler, making these functions no-ops.
 
                 // The only thing that needs to be ensured is the correct calling convention.
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
             }
             _ => return interp_ok(EmulateItemResult::NotSupported),
         }
diff --git a/src/tools/miri/src/shims/x86/avx2.rs b/src/tools/miri/src/shims/x86/avx2.rs
index c79899285cd..5dfe5cc2c54 100644
--- a/src/tools/miri/src/shims/x86/avx2.rs
+++ b/src/tools/miri/src/shims/x86/avx2.rs
@@ -1,8 +1,9 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::mir;
 use rustc_middle::ty::Ty;
 use rustc_middle::ty::layout::LayoutOf as _;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use super::{
     ShiftOp, horizontal_bin_op, int_abs, mask_load, mask_store, mpsadbw, packssdw, packsswb,
@@ -28,7 +29,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Used to implement the _mm256_abs_epi{8,16,32} functions.
             // Calculates the absolute value of packed 8/16/32-bit integers.
             "pabs.b" | "pabs.w" | "pabs.d" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 int_abs(this, op, dest)?;
             }
@@ -36,7 +37,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Horizontally add / add with saturation / subtract adjacent 16/32-bit
             // integer values in `left` and `right`.
             "phadd.w" | "phadd.sw" | "phadd.d" | "phsub.w" | "phsub.sw" | "phsub.d" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (which, saturating) = match unprefixed_name {
                     "phadd.w" | "phadd.d" => (mir::BinOp::Add, false),
@@ -57,7 +58,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             | "gather.d.pd.256" | "gather.q.pd" | "gather.q.pd.256" | "gather.d.ps"
             | "gather.d.ps.256" | "gather.q.ps" | "gather.q.ps.256" => {
                 let [src, slice, offsets, mask, scale] =
-                    this.check_shim(abi, Conv::C, link_name, args)?;
+                    this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 assert_eq!(dest.layout, src.layout);
 
@@ -114,7 +115,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // intermediate signed 32-bit integers. Horizontally add adjacent pairs of
             // intermediate 32-bit integers, and pack the results in `dest`.
             "pmadd.wd" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -150,7 +151,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // the saturating sum of the products with indices `2*i` and `2*i+1`
             // produces the output at index `i`.
             "pmadd.ub.sw" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -184,7 +185,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // is one, it is loaded from `ptr.wrapping_add(i)`, otherwise zero is
             // loaded.
             "maskload.d" | "maskload.q" | "maskload.d.256" | "maskload.q.256" => {
-                let [ptr, mask] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr, mask] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 mask_load(this, ptr, mask, dest)?;
             }
@@ -194,7 +195,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // is one, it is stored into `ptr.wapping_add(i)`.
             // Unlike SSE2's _mm_maskmoveu_si128, these are not non-temporal stores.
             "maskstore.d" | "maskstore.q" | "maskstore.d.256" | "maskstore.q.256" => {
-                let [ptr, mask, value] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [ptr, mask, value] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 mask_store(this, ptr, mask, value)?;
             }
@@ -205,7 +206,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // offsets specified in `imm`.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm256_mpsadbw_epu8
             "mpsadbw" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 mpsadbw(this, left, right, imm, dest)?;
             }
@@ -216,7 +217,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // 1 and then taking the bits `1..=16`.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm256_mulhrs_epi16
             "pmul.hr.sw" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 pmulhrsw(this, left, right, dest)?;
             }
@@ -224,7 +225,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Converts two 16-bit integer vectors to a single 8-bit integer
             // vector with signed saturation.
             "packsswb" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 packsswb(this, left, right, dest)?;
             }
@@ -232,7 +233,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Converts two 32-bit integer vectors to a single 16-bit integer
             // vector with signed saturation.
             "packssdw" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 packssdw(this, left, right, dest)?;
             }
@@ -240,7 +241,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Converts two 16-bit signed integer vectors to a single 8-bit
             // unsigned integer vector with saturation.
             "packuswb" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 packuswb(this, left, right, dest)?;
             }
@@ -248,7 +249,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Concatenates two 32-bit signed integer vectors and converts
             // the result to a 16-bit unsigned integer vector with saturation.
             "packusdw" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 packusdw(this, left, right, dest)?;
             }
@@ -257,7 +258,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Shuffles `left` using the three low bits of each element of `right`
             // as indices.
             "permd" | "permps" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -277,7 +278,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Used to implement the _mm256_permute2x128_si256 function.
             // Shuffles 128-bit blocks of `a` and `b` using `imm` as pattern.
             "vperm2i128" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 assert_eq!(left.layout.size.bits(), 256);
                 assert_eq!(right.layout.size.bits(), 256);
@@ -314,7 +315,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // in `dest`.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm256_sad_epu8
             "psad.bw" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -346,7 +347,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Shuffles bytes from `left` using `right` as pattern.
             // Each 128-bit block is shuffled independently.
             "pshuf.b" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -377,7 +378,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // is writen to the corresponding output element.
             // Basically, we multiply `left` with `right.signum()`.
             "psign.b" | "psign.w" | "psign.d" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 psign(this, left, right, dest)?;
             }
@@ -391,7 +392,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // is copied to remaining bits.
             "psll.w" | "psrl.w" | "psra.w" | "psll.d" | "psrl.d" | "psra.d" | "psll.q"
             | "psrl.q" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "psll.w" | "psll.d" | "psll.q" => ShiftOp::Left,
@@ -406,7 +407,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // (except _mm{,256}_srav_epi64, which are not available in AVX2).
             "psllv.d" | "psllv.d.256" | "psllv.q" | "psllv.q.256" | "psrlv.d" | "psrlv.d.256"
             | "psrlv.q" | "psrlv.q.256" | "psrav.d" | "psrav.d.256" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "psllv.d" | "psllv.d.256" | "psllv.q" | "psllv.q.256" => ShiftOp::Left,
diff --git a/src/tools/miri/src/shims/x86/bmi.rs b/src/tools/miri/src/shims/x86/bmi.rs
index 8af59df0a68..80b1b2e16e6 100644
--- a/src/tools/miri/src/shims/x86/bmi.rs
+++ b/src/tools/miri/src/shims/x86/bmi.rs
@@ -1,6 +1,7 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::*;
 
@@ -34,7 +35,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             return interp_ok(EmulateItemResult::NotSupported);
         }
 
-        let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+        let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
         let left = this.read_scalar(left)?;
         let right = this.read_scalar(right)?;
 
diff --git a/src/tools/miri/src/shims/x86/gfni.rs b/src/tools/miri/src/shims/x86/gfni.rs
index a91c74283fd..f83ce560c84 100644
--- a/src/tools/miri/src/shims/x86/gfni.rs
+++ b/src/tools/miri/src/shims/x86/gfni.rs
@@ -1,6 +1,7 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::*;
 
@@ -30,14 +31,14 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // See `affine_transform` for details.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=gf2p8affine_
             "vgf2p8affineqb.128" | "vgf2p8affineqb.256" | "vgf2p8affineqb.512" => {
-                let [left, right, imm8] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm8] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 affine_transform(this, left, right, imm8, dest, /* inverse */ false)?;
             }
             // Used to implement the `_mm{, 256, 512}_gf2p8affineinv_epi64_epi8` functions.
             // See `affine_transform` for details.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=gf2p8affineinv
             "vgf2p8affineinvqb.128" | "vgf2p8affineinvqb.256" | "vgf2p8affineinvqb.512" => {
-                let [left, right, imm8] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm8] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 affine_transform(this, left, right, imm8, dest, /* inverse */ true)?;
             }
             // Used to implement the `_mm{, 256, 512}_gf2p8mul_epi8` functions.
@@ -46,7 +47,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // polynomial representation with the reduction polynomial x^8 + x^4 + x^3 + x + 1.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=gf2p8mul
             "vgf2p8mulb.128" | "vgf2p8mulb.256" | "vgf2p8mulb.512" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
                 let (dest, dest_len) = this.project_to_simd(dest)?;
diff --git a/src/tools/miri/src/shims/x86/mod.rs b/src/tools/miri/src/shims/x86/mod.rs
index ac59cc2dfeb..7dee8ddd23c 100644
--- a/src/tools/miri/src/shims/x86/mod.rs
+++ b/src/tools/miri/src/shims/x86/mod.rs
@@ -1,11 +1,11 @@
-use rustc_abi::Size;
+use rustc_abi::{CanonAbi, Size};
 use rustc_apfloat::Float;
 use rustc_apfloat::ieee::Single;
 use rustc_middle::ty::Ty;
 use rustc_middle::ty::layout::LayoutOf as _;
 use rustc_middle::{mir, ty};
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use self::helpers::bool_to_simd_element;
 use crate::*;
@@ -46,7 +46,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     return interp_ok(EmulateItemResult::NotSupported);
                 }
 
-                let [cb_in, a, b] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [cb_in, a, b] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let op = if unprefixed_name.starts_with("add") {
                     mir::BinOp::AddWithOverflow
                 } else {
@@ -68,7 +68,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 if is_u64 && this.tcx.sess.target.arch != "x86_64" {
                     return interp_ok(EmulateItemResult::NotSupported);
                 }
-                let [c_in, a, b, out] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [c_in, a, b, out] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let out = this.deref_pointer_as(
                     out,
                     if is_u64 { this.machine.layouts.u64 } else { this.machine.layouts.u32 },
@@ -85,7 +85,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // the instruction behaves like a no-op, so it is always safe to call the
             // intrinsic.
             "sse2.pause" => {
-                let [] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 // Only exhibit the spin-loop hint behavior when SSE2 is enabled.
                 if this.tcx.sess.unstable_target_features.contains(&Symbol::intern("sse2")) {
                     this.yield_active_thread();
@@ -104,7 +104,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     len = 8;
                 }
 
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 pclmulqdq(this, left, right, imm, dest, len)?;
             }
diff --git a/src/tools/miri/src/shims/x86/sha.rs b/src/tools/miri/src/shims/x86/sha.rs
index 23c83553f3b..d37fad3e6c7 100644
--- a/src/tools/miri/src/shims/x86/sha.rs
+++ b/src/tools/miri/src/shims/x86/sha.rs
@@ -4,9 +4,10 @@
 //!
 //! [RustCrypto's sha256 module]: https://github.com/RustCrypto/hashes/blob/6be8466247e936c415d8aafb848697f39894a386/sha2/src/sha256/soft.rs
 
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::*;
 
@@ -52,7 +53,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         match unprefixed_name {
             // Used to implement the _mm_sha256rnds2_epu32 function.
             "256rnds2" => {
-                let [a, b, k] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [a, b, k] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (a_reg, a_len) = this.project_to_simd(a)?;
                 let (b_reg, b_len) = this.project_to_simd(b)?;
@@ -73,7 +74,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
             // Used to implement the _mm_sha256msg1_epu32 function.
             "256msg1" => {
-                let [a, b] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [a, b] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (a_reg, a_len) = this.project_to_simd(a)?;
                 let (b_reg, b_len) = this.project_to_simd(b)?;
@@ -91,7 +92,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             }
             // Used to implement the _mm_sha256msg2_epu32 function.
             "256msg2" => {
-                let [a, b] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [a, b] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (a_reg, a_len) = this.project_to_simd(a)?;
                 let (b_reg, b_len) = this.project_to_simd(b)?;
diff --git a/src/tools/miri/src/shims/x86/sse.rs b/src/tools/miri/src/shims/x86/sse.rs
index fd7aba2437a..1ec15d609c6 100644
--- a/src/tools/miri/src/shims/x86/sse.rs
+++ b/src/tools/miri/src/shims/x86/sse.rs
@@ -1,7 +1,8 @@
+use rustc_abi::CanonAbi;
 use rustc_apfloat::ieee::Single;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use super::{
     FloatBinOp, FloatUnaryOp, bin_op_simd_float_all, bin_op_simd_float_first, unary_op_ps,
@@ -33,7 +34,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Performs the operations on the first component of `left` and
             // `right` and copies the remaining components from `left`.
             "min.ss" | "max.ss" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "min.ss" => FloatBinOp::Min,
@@ -49,7 +50,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // matches the IEEE min/max operations, while x86 has different
             // semantics.
             "min.ps" | "max.ps" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "min.ps" => FloatBinOp::Min,
@@ -63,7 +64,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Performs the operations on the first component of `op` and
             // copies the remaining components from `op`.
             "rcp.ss" | "rsqrt.ss" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "rcp.ss" => FloatUnaryOp::Rcp,
@@ -76,7 +77,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Used to implement _mm_{sqrt,rcp,rsqrt}_ps functions.
             // Performs the operations on all components of `op`.
             "rcp.ps" | "rsqrt.ps" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "rcp.ps" => FloatUnaryOp::Rcp,
@@ -95,7 +96,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // _mm_cmp{eq,lt,le,gt,ge,neq,nlt,nle,ngt,nge,ord,unord}_ss are SSE functions
             // with hard-coded operations.
             "cmp.ss" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which =
                     FloatBinOp::cmp_from_imm(this, this.read_scalar(imm)?.to_i8()?, link_name)?;
@@ -111,7 +112,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // _mm_cmp{eq,lt,le,gt,ge,neq,nlt,nle,ngt,nge,ord,unord}_ps are SSE functions
             // with hard-coded operations.
             "cmp.ps" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which =
                     FloatBinOp::cmp_from_imm(this, this.read_scalar(imm)?.to_i8()?, link_name)?;
@@ -124,7 +125,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             "comieq.ss" | "comilt.ss" | "comile.ss" | "comigt.ss" | "comige.ss" | "comineq.ss"
             | "ucomieq.ss" | "ucomilt.ss" | "ucomile.ss" | "ucomigt.ss" | "ucomige.ss"
             | "ucomineq.ss" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -152,7 +153,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // _mm_cvtss_si64 and _mm_cvttss_si64 functions.
             // Converts the first component of `op` from f32 to i32/i64.
             "cvtss2si" | "cvttss2si" | "cvtss2si64" | "cvttss2si64" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let (op, _) = this.project_to_simd(op)?;
 
                 let op = this.read_immediate(&this.project_index(&op, 0)?)?;
@@ -180,7 +181,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // are copied from `left`.
             // https://www.felixcloutier.com/x86/cvtsi2ss
             "cvtsi2ss" | "cvtsi642ss" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (dest, dest_len) = this.project_to_simd(dest)?;
diff --git a/src/tools/miri/src/shims/x86/sse2.rs b/src/tools/miri/src/shims/x86/sse2.rs
index e0695b7cb7b..d6052f83077 100644
--- a/src/tools/miri/src/shims/x86/sse2.rs
+++ b/src/tools/miri/src/shims/x86/sse2.rs
@@ -1,7 +1,8 @@
+use rustc_abi::CanonAbi;
 use rustc_apfloat::ieee::Double;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use super::{
     FloatBinOp, ShiftOp, bin_op_simd_float_all, bin_op_simd_float_first, convert_float_to_int,
@@ -40,7 +41,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // intermediate signed 32-bit integers. Horizontally add adjacent pairs of
             // intermediate 32-bit integers, and pack the results in `dest`.
             "pmadd.wd" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -78,7 +79,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             //
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_sad_epu8
             "psad.bw" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -116,7 +117,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // is copied to remaining bits.
             "psll.w" | "psrl.w" | "psra.w" | "psll.d" | "psrl.d" | "psra.d" | "psll.q"
             | "psrl.q" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "psll.w" | "psll.d" | "psll.q" => ShiftOp::Left,
@@ -131,7 +132,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // and _mm_cvttpd_epi32 functions.
             // Converts packed f32/f64 to packed i32.
             "cvtps2dq" | "cvttps2dq" | "cvtpd2dq" | "cvttpd2dq" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (op_len, _) = op.layout.ty.simd_size_and_type(*this.tcx);
                 let (dest_len, _) = dest.layout.ty.simd_size_and_type(*this.tcx);
@@ -168,7 +169,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Converts two 16-bit integer vectors to a single 8-bit integer
             // vector with signed saturation.
             "packsswb.128" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 packsswb(this, left, right, dest)?;
             }
@@ -176,7 +177,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Converts two 16-bit signed integer vectors to a single 8-bit
             // unsigned integer vector with saturation.
             "packuswb.128" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 packuswb(this, left, right, dest)?;
             }
@@ -184,7 +185,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Converts two 32-bit integer vectors to a single 16-bit integer
             // vector with signed saturation.
             "packssdw.128" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 packssdw(this, left, right, dest)?;
             }
@@ -194,7 +195,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // matches the IEEE min/max operations, while x86 has different
             // semantics.
             "min.sd" | "max.sd" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "min.sd" => FloatBinOp::Min,
@@ -210,7 +211,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // matches the IEEE min/max operations, while x86 has different
             // semantics.
             "min.pd" | "max.pd" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "min.pd" => FloatBinOp::Min,
@@ -229,7 +230,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // _mm_cmp{eq,lt,le,gt,ge,neq,nlt,nle,ngt,nge,ord,unord}_sd are SSE2 functions
             // with hard-coded operations.
             "cmp.sd" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which =
                     FloatBinOp::cmp_from_imm(this, this.read_scalar(imm)?.to_i8()?, link_name)?;
@@ -245,7 +246,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // _mm_cmp{eq,lt,le,gt,ge,neq,nlt,nle,ngt,nge,ord,unord}_pd are SSE2 functions
             // with hard-coded operations.
             "cmp.pd" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which =
                     FloatBinOp::cmp_from_imm(this, this.read_scalar(imm)?.to_i8()?, link_name)?;
@@ -258,7 +259,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             "comieq.sd" | "comilt.sd" | "comile.sd" | "comigt.sd" | "comige.sd" | "comineq.sd"
             | "ucomieq.sd" | "ucomilt.sd" | "ucomile.sd" | "ucomigt.sd" | "ucomige.sd"
             | "ucomineq.sd" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -286,7 +287,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // _mm_cvtsd_si64 and _mm_cvttsd_si64 functions.
             // Converts the first component of `op` from f64 to i32/i64.
             "cvtsd2si" | "cvttsd2si" | "cvtsd2si64" | "cvttsd2si64" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let (op, _) = this.project_to_simd(op)?;
 
                 let op = this.read_immediate(&this.project_index(&op, 0)?)?;
@@ -312,7 +313,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Converts the first f64/f32 from `right` to f32/f64 and copies
             // the remaining elements from `left`
             "cvtsd2ss" | "cvtss2sd" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, _) = this.project_to_simd(right)?;
diff --git a/src/tools/miri/src/shims/x86/sse3.rs b/src/tools/miri/src/shims/x86/sse3.rs
index 60b7764a01e..ebf3cb5c3ee 100644
--- a/src/tools/miri/src/shims/x86/sse3.rs
+++ b/src/tools/miri/src/shims/x86/sse3.rs
@@ -1,7 +1,8 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::mir;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use super::horizontal_bin_op;
 use crate::*;
@@ -25,7 +26,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Horizontally add/subtract adjacent floating point values
             // in `left` and `right`.
             "hadd.ps" | "hadd.pd" | "hsub.ps" | "hsub.pd" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let which = match unprefixed_name {
                     "hadd.ps" | "hadd.pd" => mir::BinOp::Add,
@@ -41,7 +42,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // the data crosses a cache line, but for Miri this is just a regular
             // unaligned read.
             "ldu.dq" => {
-                let [src_ptr] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [src_ptr] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let src_ptr = this.read_pointer(src_ptr)?;
                 let dest = dest.force_mplace(this)?;
 
diff --git a/src/tools/miri/src/shims/x86/sse41.rs b/src/tools/miri/src/shims/x86/sse41.rs
index 93d689a3044..6797039cf56 100644
--- a/src/tools/miri/src/shims/x86/sse41.rs
+++ b/src/tools/miri/src/shims/x86/sse41.rs
@@ -1,6 +1,7 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use super::{conditional_dot_product, mpsadbw, packusdw, round_all, round_first, test_bits_masked};
 use crate::*;
@@ -27,7 +28,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // bits `4..=5` if `imm`, and `i`th bit specifies whether element
             // `i` is zeroed.
             "insertps" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -62,7 +63,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Concatenates two 32-bit signed integer vectors and converts
             // the result to a 16-bit unsigned integer vector with saturation.
             "packusdw" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 packusdw(this, left, right, dest)?;
             }
@@ -72,7 +73,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // products, and conditionally stores the sum in `dest` using the low
             // 4 bits of `imm`.
             "dpps" | "dppd" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 conditional_dot_product(this, left, right, imm, dest)?;
             }
@@ -80,14 +81,14 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // functions. Rounds the first element of `right` according to `rounding`
             // and copies the remaining elements from `left`.
             "round.ss" => {
-                let [left, right, rounding] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, rounding] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 round_first::<rustc_apfloat::ieee::Single>(this, left, right, rounding, dest)?;
             }
             // Used to implement the _mm_floor_ps, _mm_ceil_ps and _mm_round_ps
             // functions. Rounds the elements of `op` according to `rounding`.
             "round.ps" => {
-                let [op, rounding] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op, rounding] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 round_all::<rustc_apfloat::ieee::Single>(this, op, rounding, dest)?;
             }
@@ -95,14 +96,14 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // functions. Rounds the first element of `right` according to `rounding`
             // and copies the remaining elements from `left`.
             "round.sd" => {
-                let [left, right, rounding] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, rounding] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 round_first::<rustc_apfloat::ieee::Double>(this, left, right, rounding, dest)?;
             }
             // Used to implement the _mm_floor_pd, _mm_ceil_pd and _mm_round_pd
             // functions. Rounds the elements of `op` according to `rounding`.
             "round.pd" => {
-                let [op, rounding] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op, rounding] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 round_all::<rustc_apfloat::ieee::Double>(this, op, rounding, dest)?;
             }
@@ -110,7 +111,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Find the minimum unsinged 16-bit integer in `op` and
             // returns its value and position.
             "phminposuw" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (op, op_len) = this.project_to_simd(op)?;
                 let (dest, dest_len) = this.project_to_simd(dest)?;
@@ -144,7 +145,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // offsets specified in `imm`.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_mpsadbw_epu8
             "mpsadbw" => {
-                let [left, right, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 mpsadbw(this, left, right, imm, dest)?;
             }
@@ -153,7 +154,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Tests `(op & mask) == 0`, `(op & mask) == mask` or
             // `(op & mask) != 0 && (op & mask) != mask`
             "ptestz" | "ptestc" | "ptestnzc" => {
-                let [op, mask] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op, mask] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (all_zero, masked_set) = test_bits_masked(this, op, mask)?;
                 let res = match unprefixed_name {
diff --git a/src/tools/miri/src/shims/x86/sse42.rs b/src/tools/miri/src/shims/x86/sse42.rs
index 66bff328626..830513f0291 100644
--- a/src/tools/miri/src/shims/x86/sse42.rs
+++ b/src/tools/miri/src/shims/x86/sse42.rs
@@ -1,9 +1,9 @@
-use rustc_abi::Size;
+use rustc_abi::{CanonAbi, Size};
 use rustc_middle::mir;
 use rustc_middle::ty::Ty;
 use rustc_middle::ty::layout::LayoutOf as _;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use crate::*;
 
@@ -223,7 +223,7 @@ fn deconstruct_args<'tcx>(
     };
 
     if is_explicit {
-        let [str1, len1, str2, len2, imm] = ecx.check_shim(abi, Conv::C, link_name, args)?;
+        let [str1, len1, str2, len2, imm] = ecx.check_shim(abi, CanonAbi::C, link_name, args)?;
         let imm = ecx.read_scalar(imm)?.to_u8()?;
 
         let default_len = default_len::<u32>(imm);
@@ -236,7 +236,7 @@ fn deconstruct_args<'tcx>(
 
         interp_ok((str1, str2, Some((len1, len2)), imm))
     } else {
-        let [str1, str2, imm] = ecx.check_shim(abi, Conv::C, link_name, args)?;
+        let [str1, str2, imm] = ecx.check_shim(abi, CanonAbi::C, link_name, args)?;
         let imm = ecx.read_scalar(imm)?.to_u8()?;
 
         let array_layout = array_layout_fn(ecx, imm)?;
@@ -386,7 +386,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // search for a null terminator (see `deconstruct_args` for more details).
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#ig_expand=924,925
             "pcmpistriz128" | "pcmpistris128" => {
-                let [str1, str2, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [str1, str2, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let imm = this.read_scalar(imm)?.to_u8()?;
 
                 let str = if unprefixed_name == "pcmpistris128" { str1 } else { str2 };
@@ -406,7 +406,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // than 16 for byte-sized operands or 8 for word-sized operands.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#ig_expand=1046,1047
             "pcmpestriz128" | "pcmpestris128" => {
-                let [_, len1, _, len2, imm] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [_, len1, _, len2, imm] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let len = if unprefixed_name == "pcmpestris128" { len1 } else { len2 };
                 let len = this.read_scalar(len)?.to_i32()?;
                 let imm = this.read_scalar(imm)?.to_u8()?;
@@ -433,7 +433,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     return interp_ok(EmulateItemResult::NotSupported);
                 }
 
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
                 let left = this.read_scalar(left)?;
                 let right = this.read_scalar(right)?;
 
diff --git a/src/tools/miri/src/shims/x86/ssse3.rs b/src/tools/miri/src/shims/x86/ssse3.rs
index f3e9ac0e5dc..310d6b8f765 100644
--- a/src/tools/miri/src/shims/x86/ssse3.rs
+++ b/src/tools/miri/src/shims/x86/ssse3.rs
@@ -1,7 +1,8 @@
+use rustc_abi::CanonAbi;
 use rustc_middle::mir;
 use rustc_middle::ty::Ty;
 use rustc_span::Symbol;
-use rustc_target::callconv::{Conv, FnAbi};
+use rustc_target::callconv::FnAbi;
 
 use super::{horizontal_bin_op, int_abs, pmulhrsw, psign};
 use crate::*;
@@ -24,7 +25,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Used to implement the _mm_abs_epi{8,16,32} functions.
             // Calculates the absolute value of packed 8/16/32-bit integers.
             "pabs.b.128" | "pabs.w.128" | "pabs.d.128" => {
-                let [op] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [op] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 int_abs(this, op, dest)?;
             }
@@ -32,7 +33,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // Shuffles bytes from `left` using `right` as pattern.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_shuffle_epi8
             "pshuf.b.128" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -61,7 +62,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // integer values in `left` and `right`.
             "phadd.w.128" | "phadd.sw.128" | "phadd.d.128" | "phsub.w.128" | "phsub.sw.128"
             | "phsub.d.128" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (which, saturating) = match unprefixed_name {
                     "phadd.w.128" | "phadd.d.128" => (mir::BinOp::Add, false),
@@ -80,7 +81,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // produces the output at index `i`.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_maddubs_epi16
             "pmadd.ub.sw.128" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 let (left, left_len) = this.project_to_simd(left)?;
                 let (right, right_len) = this.project_to_simd(right)?;
@@ -115,7 +116,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // 1 and then taking the bits `1..=16`.
             // https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_mulhrs_epi16
             "pmul.hr.sw.128" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 pmulhrsw(this, left, right, dest)?;
             }
@@ -125,7 +126,7 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             // is writen to the corresponding output element.
             // Basically, we multiply `left` with `right.signum()`.
             "psign.b.128" | "psign.w.128" | "psign.d.128" => {
-                let [left, right] = this.check_shim(abi, Conv::C, link_name, args)?;
+                let [left, right] = this.check_shim(abi, CanonAbi::C, link_name, args)?;
 
                 psign(this, left, right, dest)?;
             }
diff --git a/src/tools/miri/tests/fail/const-ub-checks.rs b/src/tools/miri/tests/fail/const-ub-checks.rs
index 9cc8b91ff50..004bbe9f5ea 100644
--- a/src/tools/miri/tests/fail/const-ub-checks.rs
+++ b/src/tools/miri/tests/fail/const-ub-checks.rs
@@ -1,7 +1,7 @@
 const UNALIGNED_READ: () = unsafe {
     let x = &[0u8; 4];
     let ptr = x.as_ptr().cast::<u32>();
-    ptr.read(); //~ERROR: evaluation of constant value failed
+    ptr.read(); //~ERROR: accessing memory based on pointer with alignment 1, but alignment 4 is required
 };
 
 fn main() {
diff --git a/src/tools/miri/tests/fail/const-ub-checks.stderr b/src/tools/miri/tests/fail/const-ub-checks.stderr
index e6b302dd28c..9bac524bd45 100644
--- a/src/tools/miri/tests/fail/const-ub-checks.stderr
+++ b/src/tools/miri/tests/fail/const-ub-checks.stderr
@@ -1,8 +1,8 @@
-error[E0080]: evaluation of constant value failed
+error[E0080]: accessing memory based on pointer with alignment ALIGN, but alignment ALIGN is required
   --> tests/fail/const-ub-checks.rs:LL:CC
    |
 LL |     ptr.read();
-   |     ^^^^^^^^^^ accessing memory based on pointer with alignment ALIGN, but alignment ALIGN is required
+   |     ^^^^^^^^^^ evaluation of constant value failed here
 
 note: erroneous constant encountered
   --> tests/fail/const-ub-checks.rs:LL:CC
diff --git a/src/tools/miri/tests/fail/erroneous_const.rs b/src/tools/miri/tests/fail/erroneous_const.rs
index 65f7aafc3cc..6e126ed701f 100644
--- a/src/tools/miri/tests/fail/erroneous_const.rs
+++ b/src/tools/miri/tests/fail/erroneous_const.rs
@@ -4,7 +4,7 @@
 
 struct PrintName<T>(T);
 impl<T> PrintName<T> {
-    const VOID: ! = panic!(); //~ERROR: evaluation of `PrintName::<i32>::VOID` failed
+    const VOID: ! = panic!(); //~ERROR: explicit panic
 }
 
 fn no_codegen<T>() {
diff --git a/src/tools/miri/tests/fail/erroneous_const.stderr b/src/tools/miri/tests/fail/erroneous_const.stderr
index 6f1e3529ccc..1aa87dd7188 100644
--- a/src/tools/miri/tests/fail/erroneous_const.stderr
+++ b/src/tools/miri/tests/fail/erroneous_const.stderr
@@ -1,8 +1,8 @@
-error[E0080]: evaluation of `PrintName::<i32>::VOID` failed
+error[E0080]: evaluation panicked: explicit panic
   --> tests/fail/erroneous_const.rs:LL:CC
    |
 LL |     const VOID: ! = panic!();
-   |                     ^^^^^^^^ evaluation panicked: explicit panic
+   |                     ^^^^^^^^ evaluation of `PrintName::<i32>::VOID` failed here
 
 note: erroneous constant encountered
   --> tests/fail/erroneous_const.rs:LL:CC
diff --git a/src/tools/miri/tests/fail/erroneous_const2.rs b/src/tools/miri/tests/fail/erroneous_const2.rs
index 9a1a970778f..ea98b64ad81 100644
--- a/src/tools/miri/tests/fail/erroneous_const2.rs
+++ b/src/tools/miri/tests/fail/erroneous_const2.rs
@@ -1,7 +1,7 @@
 const X: u32 = 5;
 const Y: u32 = 6;
 const FOO: u32 = [X - Y, Y - X][(X < Y) as usize];
-//~^ERROR: evaluation of constant value failed
+//~^ERROR: overflow
 
 #[rustfmt::skip] // rustfmt bug: https://github.com/rust-lang/rustfmt/issues/5391
 fn main() {
diff --git a/src/tools/miri/tests/fail/erroneous_const2.stderr b/src/tools/miri/tests/fail/erroneous_const2.stderr
index 76f8cbcd289..9d3f1b13bee 100644
--- a/src/tools/miri/tests/fail/erroneous_const2.stderr
+++ b/src/tools/miri/tests/fail/erroneous_const2.stderr
@@ -1,8 +1,8 @@
-error[E0080]: evaluation of constant value failed
+error[E0080]: attempt to compute `5_u32 - 6_u32`, which would overflow
   --> tests/fail/erroneous_const2.rs:LL:CC
    |
 LL | const FOO: u32 = [X - Y, Y - X][(X < Y) as usize];
-   |                   ^^^^^ attempt to compute `5_u32 - 6_u32`, which would overflow
+   |                   ^^^^^ evaluation of constant value failed here
 
 note: erroneous constant encountered
   --> tests/fail/erroneous_const2.rs:LL:CC
diff --git a/src/tools/miri/tests/pass/iter_macro.rs b/src/tools/miri/tests/pass/iter_macro.rs
new file mode 100644
index 00000000000..367c13f9969
--- /dev/null
+++ b/src/tools/miri/tests/pass/iter_macro.rs
@@ -0,0 +1,22 @@
+#![feature(iter_macro, yield_expr)]
+
+use std::iter::iter;
+
+fn main() {
+    let i = iter! { || {
+        yield 0;
+        for x in 5..10 {
+            yield x * 2;
+        }
+    } };
+    let mut i = i();
+    assert_eq!(i.next(), Some(0));
+    assert_eq!(i.next(), Some(10));
+    assert_eq!(i.next(), Some(12));
+    assert_eq!(i.next(), Some(14));
+    assert_eq!(i.next(), Some(16));
+    assert_eq!(i.next(), Some(18));
+    assert_eq!(i.next(), None);
+    assert_eq!(i.next(), None);
+    assert_eq!(i.next(), None);
+}
diff --git a/src/tools/rust-analyzer/crates/hir-expand/src/files.rs b/src/tools/rust-analyzer/crates/hir-expand/src/files.rs
index 321ee8feb9a..8024823cbc5 100644
--- a/src/tools/rust-analyzer/crates/hir-expand/src/files.rs
+++ b/src/tools/rust-analyzer/crates/hir-expand/src/files.rs
@@ -42,6 +42,49 @@ impl FilePosition {
         FilePositionWrapper { file_id: self.file_id.file_id(db), offset: self.offset }
     }
 }
+
+impl From<FileRange> for HirFileRange {
+    fn from(value: FileRange) -> Self {
+        HirFileRange { file_id: value.file_id.into(), range: value.range }
+    }
+}
+
+impl From<FilePosition> for HirFilePosition {
+    fn from(value: FilePosition) -> Self {
+        HirFilePosition { file_id: value.file_id.into(), offset: value.offset }
+    }
+}
+
+impl FilePositionWrapper<span::FileId> {
+    pub fn with_edition(self, db: &dyn ExpandDatabase, edition: span::Edition) -> FilePosition {
+        FilePositionWrapper {
+            file_id: EditionedFileId::new(db, self.file_id, edition),
+            offset: self.offset,
+        }
+    }
+}
+
+impl FileRangeWrapper<span::FileId> {
+    pub fn with_edition(self, db: &dyn ExpandDatabase, edition: span::Edition) -> FileRange {
+        FileRangeWrapper {
+            file_id: EditionedFileId::new(db, self.file_id, edition),
+            range: self.range,
+        }
+    }
+}
+
+impl<T> InFileWrapper<span::FileId, T> {
+    pub fn with_edition(self, db: &dyn ExpandDatabase, edition: span::Edition) -> InRealFile<T> {
+        InRealFile { file_id: EditionedFileId::new(db, self.file_id, edition), value: self.value }
+    }
+}
+
+impl HirFileRange {
+    pub fn file_range(self) -> Option<FileRange> {
+        Some(FileRange { file_id: self.file_id.file_id()?, range: self.range })
+    }
+}
+
 #[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
 pub struct FileRangeWrapper<FileKind> {
     pub file_id: FileKind,
@@ -194,6 +237,9 @@ impl<FileId: Copy, N: AstNode> InFileWrapper<FileId, N> {
     pub fn syntax(&self) -> InFileWrapper<FileId, &SyntaxNode> {
         self.with_value(self.value.syntax())
     }
+    pub fn node_file_range(&self) -> FileRangeWrapper<FileId> {
+        FileRangeWrapper { file_id: self.file_id, range: self.value.syntax().text_range() }
+    }
 }
 
 impl<FileId: Copy, N: AstNode> InFileWrapper<FileId, &N> {
@@ -204,9 +250,9 @@ impl<FileId: Copy, N: AstNode> InFileWrapper<FileId, &N> {
 }
 
 // region:specific impls
-impl<SN: Borrow<SyntaxNode>> InRealFile<SN> {
-    pub fn file_range(&self) -> FileRange {
-        FileRange { file_id: self.file_id, range: self.value.borrow().text_range() }
+impl<FileId: Copy, SN: Borrow<SyntaxNode>> InFileWrapper<FileId, SN> {
+    pub fn file_range(&self) -> FileRangeWrapper<FileId> {
+        FileRangeWrapper { file_id: self.file_id, range: self.value.borrow().text_range() }
     }
 }
 
diff --git a/src/tools/rust-analyzer/crates/hir-expand/src/lib.rs b/src/tools/rust-analyzer/crates/hir-expand/src/lib.rs
index d844d8f41ee..6ecac1463f5 100644
--- a/src/tools/rust-analyzer/crates/hir-expand/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/hir-expand/src/lib.rs
@@ -392,6 +392,10 @@ impl HirFileId {
         }
     }
 
+    pub fn call_node(self, db: &dyn ExpandDatabase) -> Option<InFile<SyntaxNode>> {
+        Some(db.lookup_intern_macro_call(self.macro_file()?).to_node(db))
+    }
+
     pub fn as_builtin_derive_attr_node(
         &self,
         db: &dyn ExpandDatabase,
@@ -848,7 +852,10 @@ impl ExpansionInfo {
         map_node_range_up(db, &self.exp_map, range)
     }
 
-    /// Maps up the text range out of the expansion into is macro call.
+    /// Maps up the text range out of the expansion into its macro call.
+    ///
+    /// Note that this may return multiple ranges as we lose the precise association between input to output
+    /// and as such we may consider inputs that are unrelated.
     pub fn map_range_up_once(
         &self,
         db: &dyn ExpandDatabase,
@@ -864,11 +871,10 @@ impl ExpansionInfo {
                 InFile { file_id, value: smallvec::smallvec![span.range + anchor_offset] }
             }
             SpanMap::ExpansionSpanMap(arg_map) => {
-                let arg_range = self
-                    .arg
-                    .value
-                    .as_ref()
-                    .map_or_else(|| TextRange::empty(TextSize::from(0)), |it| it.text_range());
+                let Some(arg_node) = &self.arg.value else {
+                    return InFile::new(self.arg.file_id, smallvec::smallvec![]);
+                };
+                let arg_range = arg_node.text_range();
                 InFile::new(
                     self.arg.file_id,
                     arg_map
diff --git a/src/tools/rust-analyzer/crates/hir-expand/src/prettify_macro_expansion_.rs b/src/tools/rust-analyzer/crates/hir-expand/src/prettify_macro_expansion_.rs
index 11cc434c2d8..6134c3a36b9 100644
--- a/src/tools/rust-analyzer/crates/hir-expand/src/prettify_macro_expansion_.rs
+++ b/src/tools/rust-analyzer/crates/hir-expand/src/prettify_macro_expansion_.rs
@@ -20,42 +20,46 @@ pub fn prettify_macro_expansion(
     let span_offset = syn.text_range().start();
     let target_crate = target_crate_id.data(db);
     let mut syntax_ctx_id_to_dollar_crate_replacement = FxHashMap::default();
-    syntax_bridge::prettify_macro_expansion::prettify_macro_expansion(syn, &mut |dollar_crate| {
-        let ctx = span_map.span_at(dollar_crate.text_range().start() + span_offset).ctx;
-        let replacement =
-            syntax_ctx_id_to_dollar_crate_replacement.entry(ctx).or_insert_with(|| {
-                let macro_call_id =
-                    ctx.outer_expn(db).expect("`$crate` cannot come from `SyntaxContextId::ROOT`");
-                let macro_call = db.lookup_intern_macro_call(macro_call_id.into());
-                let macro_def_crate = macro_call.def.krate;
-                // First, if this is the same crate as the macro, nothing will work but `crate`.
-                // If not, if the target trait has the macro's crate as a dependency, using the dependency name
-                // will work in inserted code and match the user's expectation.
-                // If not, the crate's display name is what the dependency name is likely to be once such dependency
-                // is inserted, and also understandable to the user.
-                // Lastly, if nothing else found, resort to leaving `$crate`.
-                if target_crate_id == macro_def_crate {
-                    make::tokens::crate_kw()
-                } else if let Some(dep) =
-                    target_crate.dependencies.iter().find(|dep| dep.crate_id == macro_def_crate)
-                {
-                    make::tokens::ident(dep.name.as_str())
-                } else if let Some(crate_name) = &macro_def_crate.extra_data(db).display_name {
-                    make::tokens::ident(crate_name.crate_name().as_str())
-                } else {
-                    return dollar_crate.clone();
-                }
-            });
-        if replacement.text() == "$crate" {
-            // The parent may have many children, and looking for the token may yield incorrect results.
-            return dollar_crate.clone();
-        }
-        // We need to `clone_subtree()` but rowan doesn't provide such operation for tokens.
-        let parent = replacement.parent().unwrap().clone_subtree().clone_for_update();
-        parent
-            .children_with_tokens()
-            .filter_map(NodeOrToken::into_token)
-            .find(|it| it.kind() == replacement.kind())
-            .unwrap()
-    })
+    syntax_bridge::prettify_macro_expansion::prettify_macro_expansion(
+        syn,
+        &mut |dollar_crate| {
+            let ctx = span_map.span_at(dollar_crate.text_range().start() + span_offset).ctx;
+            let replacement =
+                syntax_ctx_id_to_dollar_crate_replacement.entry(ctx).or_insert_with(|| {
+                    let macro_call_id = ctx
+                        .outer_expn(db)
+                        .expect("`$crate` cannot come from `SyntaxContextId::ROOT`");
+                    let macro_call = db.lookup_intern_macro_call(macro_call_id.into());
+                    let macro_def_crate = macro_call.def.krate;
+                    // First, if this is the same crate as the macro, nothing will work but `crate`.
+                    // If not, if the target trait has the macro's crate as a dependency, using the dependency name
+                    // will work in inserted code and match the user's expectation.
+                    // If not, the crate's display name is what the dependency name is likely to be once such dependency
+                    // is inserted, and also understandable to the user.
+                    // Lastly, if nothing else found, resort to leaving `$crate`.
+                    if target_crate_id == macro_def_crate {
+                        make::tokens::crate_kw()
+                    } else if let Some(dep) =
+                        target_crate.dependencies.iter().find(|dep| dep.crate_id == macro_def_crate)
+                    {
+                        make::tokens::ident(dep.name.as_str())
+                    } else if let Some(crate_name) = &macro_def_crate.extra_data(db).display_name {
+                        make::tokens::ident(crate_name.crate_name().as_str())
+                    } else {
+                        return dollar_crate.clone();
+                    }
+                });
+            if replacement.text() == "$crate" {
+                // The parent may have many children, and looking for the token may yield incorrect results.
+                return None;
+            }
+            // We need to `clone_subtree()` but rowan doesn't provide such operation for tokens.
+            let parent = replacement.parent().unwrap().clone_subtree().clone_for_update();
+            parent
+                .children_with_tokens()
+                .filter_map(NodeOrToken::into_token)
+                .find(|it| it.kind() == replacement.kind())
+        },
+        |_| (),
+    )
 }
diff --git a/src/tools/rust-analyzer/crates/hir/src/semantics.rs b/src/tools/rust-analyzer/crates/hir/src/semantics.rs
index aea22545ed5..e01774650b1 100644
--- a/src/tools/rust-analyzer/crates/hir/src/semantics.rs
+++ b/src/tools/rust-analyzer/crates/hir/src/semantics.rs
@@ -24,7 +24,7 @@ use hir_expand::{
     attrs::collect_attrs,
     builtin::{BuiltinFnLikeExpander, EagerExpander},
     db::ExpandDatabase,
-    files::{FileRangeWrapper, InRealFile},
+    files::{FileRangeWrapper, HirFileRange, InRealFile},
     inert_attr_macro::find_builtin_attr_idx,
     mod_path::{ModPath, PathKind},
     name::AsName,
@@ -262,6 +262,17 @@ impl<DB: HirDatabase> Semantics<'_, DB> {
         self.imp.file_to_module_defs(file.into())
     }
 
+    pub fn hir_file_to_module_def(&self, file: impl Into<HirFileId>) -> Option<Module> {
+        self.imp.hir_file_to_module_defs(file.into()).next()
+    }
+
+    pub fn hir_file_to_module_defs(
+        &self,
+        file: impl Into<HirFileId>,
+    ) -> impl Iterator<Item = Module> {
+        self.imp.hir_file_to_module_defs(file.into())
+    }
+
     pub fn to_adt_def(&self, a: &ast::Adt) -> Option<Adt> {
         self.imp.to_def(a)
     }
@@ -357,6 +368,15 @@ impl<'db> SemanticsImpl<'db> {
         tree
     }
 
+    pub fn adjust_edition(&self, file_id: HirFileId) -> HirFileId {
+        if let Some(editioned_file_id) = file_id.file_id() {
+            self.attach_first_edition(editioned_file_id.file_id(self.db))
+                .map_or(file_id, Into::into)
+        } else {
+            file_id
+        }
+    }
+
     pub fn find_parent_file(&self, file_id: HirFileId) -> Option<InFile<SyntaxNode>> {
         match file_id {
             HirFileId::FileId(file_id) => {
@@ -653,7 +673,7 @@ impl<'db> SemanticsImpl<'db> {
         string: &ast::String,
     ) -> Option<Vec<(TextRange, Option<Either<PathResolution, InlineAsmOperand>>)>> {
         let string_start = string.syntax().text_range().start();
-        let token = self.wrap_token_infile(string.syntax().clone()).into_real_file().ok()?;
+        let token = self.wrap_token_infile(string.syntax().clone());
         self.descend_into_macros_breakable(token, |token, _| {
             (|| {
                 let token = token.value;
@@ -693,50 +713,95 @@ impl<'db> SemanticsImpl<'db> {
     }
 
     /// Retrieves the formatting part of the format_args! template string at the given offset.
+    ///
+    // FIXME: Type the return type
+    /// Returns the range (pre-expansion) in the string literal corresponding to the resolution,
+    /// absolute file range (post-expansion)
+    /// of the part in the format string, the corresponding string token and the resolution if it
+    /// exists.
+    // FIXME: Remove this in favor of `check_for_format_args_template_with_file`
     pub fn check_for_format_args_template(
         &self,
         original_token: SyntaxToken,
         offset: TextSize,
-    ) -> Option<(TextRange, Option<Either<PathResolution, InlineAsmOperand>>)> {
-        let string_start = original_token.text_range().start();
-        let original_token = self.wrap_token_infile(original_token).into_real_file().ok()?;
-        self.descend_into_macros_breakable(original_token, |token, _| {
-            (|| {
-                let token = token.value;
-                self.resolve_offset_in_format_args(
-                    ast::String::cast(token)?,
-                    offset.checked_sub(string_start)?,
-                )
-                .map(|(range, res)| (range + string_start, res))
-            })()
-            .map_or(ControlFlow::Continue(()), ControlFlow::Break)
-        })
+    ) -> Option<(
+        TextRange,
+        HirFileRange,
+        ast::String,
+        Option<Either<PathResolution, InlineAsmOperand>>,
+    )> {
+        let original_token =
+            self.wrap_token_infile(original_token).map(ast::String::cast).transpose()?;
+        self.check_for_format_args_template_with_file(original_token, offset)
+    }
+
+    /// Retrieves the formatting part of the format_args! template string at the given offset.
+    ///
+    // FIXME: Type the return type
+    /// Returns the range (pre-expansion) in the string literal corresponding to the resolution,
+    /// absolute file range (post-expansion)
+    /// of the part in the format string, the corresponding string token and the resolution if it
+    /// exists.
+    pub fn check_for_format_args_template_with_file(
+        &self,
+        original_token: InFile<ast::String>,
+        offset: TextSize,
+    ) -> Option<(
+        TextRange,
+        HirFileRange,
+        ast::String,
+        Option<Either<PathResolution, InlineAsmOperand>>,
+    )> {
+        let relative_offset =
+            offset.checked_sub(original_token.value.syntax().text_range().start())?;
+        self.descend_into_macros_breakable(
+            original_token.as_ref().map(|it| it.syntax().clone()),
+            |token, _| {
+                (|| {
+                    let token = token.map(ast::String::cast).transpose()?;
+                    self.resolve_offset_in_format_args(token.as_ref(), relative_offset).map(
+                        |(range, res)| {
+                            (
+                                range + original_token.value.syntax().text_range().start(),
+                                HirFileRange {
+                                    file_id: token.file_id,
+                                    range: range + token.value.syntax().text_range().start(),
+                                },
+                                token.value,
+                                res,
+                            )
+                        },
+                    )
+                })()
+                .map_or(ControlFlow::Continue(()), ControlFlow::Break)
+            },
+        )
     }
 
     fn resolve_offset_in_format_args(
         &self,
-        string: ast::String,
+        InFile { value: string, file_id }: InFile<&ast::String>,
         offset: TextSize,
     ) -> Option<(TextRange, Option<Either<PathResolution, InlineAsmOperand>>)> {
         debug_assert!(offset <= string.syntax().text_range().len());
         let literal = string.syntax().parent().filter(|it| it.kind() == SyntaxKind::LITERAL)?;
         let parent = literal.parent()?;
         if let Some(format_args) = ast::FormatArgsExpr::cast(parent.clone()) {
-            let source_analyzer = &self.analyze_no_infer(format_args.syntax())?;
-            let format_args = self.wrap_node_infile(format_args);
+            let source_analyzer =
+                &self.analyze_impl(InFile::new(file_id, format_args.syntax()), None, false)?;
             source_analyzer
-                .resolve_offset_in_format_args(self.db, format_args.as_ref(), offset)
+                .resolve_offset_in_format_args(self.db, InFile::new(file_id, &format_args), offset)
                 .map(|(range, res)| (range, res.map(Either::Left)))
         } else {
             let asm = ast::AsmExpr::cast(parent)?;
-            let source_analyzer = &self.analyze_no_infer(asm.syntax())?;
+            let source_analyzer =
+                self.analyze_impl(InFile::new(file_id, asm.syntax()), None, false)?;
             let line = asm.template().position(|it| *it.syntax() == literal)?;
-            let asm = self.wrap_node_infile(asm);
-            source_analyzer.resolve_offset_in_asm_template(asm.as_ref(), line, offset).map(
-                |(owner, (expr, range, index))| {
+            source_analyzer
+                .resolve_offset_in_asm_template(InFile::new(file_id, &asm), line, offset)
+                .map(|(owner, (expr, range, index))| {
                     (range, Some(Either::Right(InlineAsmOperand { owner, expr, index })))
-                },
-            )
+                })
         }
     }
 
@@ -809,14 +874,11 @@ impl<'db> SemanticsImpl<'db> {
             None => return res,
         };
         let file = self.find_file(node.syntax());
-        let Some(file_id) = file.file_id.file_id() else {
-            return res;
-        };
 
         if first == last {
             // node is just the token, so descend the token
             self.descend_into_macros_impl(
-                InRealFile::new(file_id, first),
+                InFile::new(file.file_id, first),
                 &mut |InFile { value, .. }, _ctx| {
                     if let Some(node) = value
                         .parent_ancestors()
@@ -831,14 +893,14 @@ impl<'db> SemanticsImpl<'db> {
         } else {
             // Descend first and last token, then zip them to look for the node they belong to
             let mut scratch: SmallVec<[_; 1]> = smallvec![];
-            self.descend_into_macros_impl(InRealFile::new(file_id, first), &mut |token, _ctx| {
+            self.descend_into_macros_impl(InFile::new(file.file_id, first), &mut |token, _ctx| {
                 scratch.push(token);
                 CONTINUE_NO_BREAKS
             });
 
             let mut scratch = scratch.into_iter();
             self.descend_into_macros_impl(
-                InRealFile::new(file_id, last),
+                InFile::new(file.file_id, last),
                 &mut |InFile { value: last, file_id: last_fid }, _ctx| {
                     if let Some(InFile { value: first, file_id: first_fid }) = scratch.next() {
                         if first_fid == last_fid {
@@ -900,22 +962,18 @@ impl<'db> SemanticsImpl<'db> {
         token: SyntaxToken,
         mut cb: impl FnMut(InFile<SyntaxToken>, SyntaxContext),
     ) {
-        if let Ok(token) = self.wrap_token_infile(token).into_real_file() {
-            self.descend_into_macros_impl(token, &mut |t, ctx| {
-                cb(t, ctx);
-                CONTINUE_NO_BREAKS
-            });
-        }
+        self.descend_into_macros_impl(self.wrap_token_infile(token), &mut |t, ctx| {
+            cb(t, ctx);
+            CONTINUE_NO_BREAKS
+        });
     }
 
     pub fn descend_into_macros(&self, token: SyntaxToken) -> SmallVec<[SyntaxToken; 1]> {
         let mut res = smallvec![];
-        if let Ok(token) = self.wrap_token_infile(token.clone()).into_real_file() {
-            self.descend_into_macros_impl(token, &mut |t, _ctx| {
-                res.push(t.value);
-                CONTINUE_NO_BREAKS
-            });
-        }
+        self.descend_into_macros_impl(self.wrap_token_infile(token.clone()), &mut |t, _ctx| {
+            res.push(t.value);
+            CONTINUE_NO_BREAKS
+        });
         if res.is_empty() {
             res.push(token);
         }
@@ -928,15 +986,13 @@ impl<'db> SemanticsImpl<'db> {
     ) -> SmallVec<[InFile<SyntaxToken>; 1]> {
         let mut res = smallvec![];
         let token = self.wrap_token_infile(token);
-        if let Ok(token) = token.clone().into_real_file() {
-            self.descend_into_macros_impl(token, &mut |t, ctx| {
-                if !ctx.is_opaque(self.db) {
-                    // Don't descend into opaque contexts
-                    res.push(t);
-                }
-                CONTINUE_NO_BREAKS
-            });
-        }
+        self.descend_into_macros_impl(token.clone(), &mut |t, ctx| {
+            if !ctx.is_opaque(self.db) {
+                // Don't descend into opaque contexts
+                res.push(t);
+            }
+            CONTINUE_NO_BREAKS
+        });
         if res.is_empty() {
             res.push(token);
         }
@@ -945,7 +1001,7 @@ impl<'db> SemanticsImpl<'db> {
 
     pub fn descend_into_macros_breakable<T>(
         &self,
-        token: InRealFile<SyntaxToken>,
+        token: InFile<SyntaxToken>,
         mut cb: impl FnMut(InFile<SyntaxToken>, SyntaxContext) -> ControlFlow<T>,
     ) -> Option<T> {
         self.descend_into_macros_impl(token, &mut cb)
@@ -974,33 +1030,58 @@ impl<'db> SemanticsImpl<'db> {
         r
     }
 
+    /// Descends the token into expansions, returning the tokens that matches the input
+    /// token's [`SyntaxKind`] and text.
+    pub fn descend_into_macros_exact_with_file(
+        &self,
+        token: SyntaxToken,
+    ) -> SmallVec<[InFile<SyntaxToken>; 1]> {
+        let mut r = smallvec![];
+        let text = token.text();
+        let kind = token.kind();
+
+        self.descend_into_macros_cb(token.clone(), |InFile { value, file_id }, ctx| {
+            let mapped_kind = value.kind();
+            let any_ident_match = || kind.is_any_identifier() && value.kind().is_any_identifier();
+            let matches = (kind == mapped_kind || any_ident_match())
+                && text == value.text()
+                && !ctx.is_opaque(self.db);
+            if matches {
+                r.push(InFile { value, file_id });
+            }
+        });
+        if r.is_empty() {
+            r.push(self.wrap_token_infile(token));
+        }
+        r
+    }
+
     /// Descends the token into expansions, returning the first token that matches the input
     /// token's [`SyntaxKind`] and text.
     pub fn descend_into_macros_single_exact(&self, token: SyntaxToken) -> SyntaxToken {
         let text = token.text();
         let kind = token.kind();
-        if let Ok(token) = self.wrap_token_infile(token.clone()).into_real_file() {
-            self.descend_into_macros_breakable(token, |InFile { value, file_id: _ }, _ctx| {
+        self.descend_into_macros_breakable(
+            self.wrap_token_infile(token.clone()),
+            |InFile { value, file_id: _ }, _ctx| {
                 let mapped_kind = value.kind();
                 let any_ident_match =
                     || kind.is_any_identifier() && value.kind().is_any_identifier();
                 let matches = (kind == mapped_kind || any_ident_match()) && text == value.text();
                 if matches { ControlFlow::Break(value) } else { ControlFlow::Continue(()) }
-            })
-        } else {
-            None
-        }
+            },
+        )
         .unwrap_or(token)
     }
 
     fn descend_into_macros_impl<T>(
         &self,
-        InRealFile { value: token, file_id }: InRealFile<SyntaxToken>,
+        InFile { value: token, file_id }: InFile<SyntaxToken>,
         f: &mut dyn FnMut(InFile<SyntaxToken>, SyntaxContext) -> ControlFlow<T>,
     ) -> Option<T> {
         let _p = tracing::info_span!("descend_into_macros_impl").entered();
 
-        let span = self.db.real_span_map(file_id).span_for_range(token.text_range());
+        let span = self.db.span_map(file_id).span_for_range(token.text_range());
 
         // Process the expansion of a call, pushing all tokens with our span in the expansion back onto our stack
         let process_expansion_for_token = |stack: &mut Vec<_>, macro_file| {
@@ -1024,17 +1105,16 @@ impl<'db> SemanticsImpl<'db> {
         // the tokens themselves aren't that interesting as the span that is being used to map
         // things down never changes.
         let mut stack: Vec<(_, SmallVec<[_; 2]>)> = vec![];
-        let include = self.s2d_cache.borrow_mut().get_or_insert_include_for(self.db, file_id);
+        let include = file_id.file_id().and_then(|file_id| {
+            self.s2d_cache.borrow_mut().get_or_insert_include_for(self.db, file_id)
+        });
         match include {
             Some(include) => {
                 // include! inputs are always from real files, so they only need to be handled once upfront
                 process_expansion_for_token(&mut stack, include)?;
             }
             None => {
-                stack.push((
-                    file_id.into(),
-                    smallvec![(token, SyntaxContext::root(file_id.edition(self.db)))],
-                ));
+                stack.push((file_id, smallvec![(token, span.ctx)]));
             }
         }
 
@@ -1678,6 +1758,11 @@ impl<'db> SemanticsImpl<'db> {
         self.with_ctx(|ctx| ctx.file_to_def(file).to_owned()).into_iter().map(Module::from)
     }
 
+    fn hir_file_to_module_defs(&self, file: HirFileId) -> impl Iterator<Item = Module> {
+        // FIXME: Do we need to care about inline modules for macro expansions?
+        self.file_to_module_defs(file.original_file_respecting_includes(self.db).file_id(self.db))
+    }
+
     pub fn scope(&self, node: &SyntaxNode) -> Option<SemanticsScope<'db>> {
         self.analyze_no_infer(node).map(|SourceAnalyzer { file_id, resolver, .. }| SemanticsScope {
             db: self.db,
diff --git a/src/tools/rust-analyzer/crates/hir/src/source_analyzer.rs b/src/tools/rust-analyzer/crates/hir/src/source_analyzer.rs
index d22812d3c69..ec2ccf8cba0 100644
--- a/src/tools/rust-analyzer/crates/hir/src/source_analyzer.rs
+++ b/src/tools/rust-analyzer/crates/hir/src/source_analyzer.rs
@@ -1303,6 +1303,7 @@ impl<'db> SourceAnalyzer<'db> {
         false
     }
 
+    /// Returns the range of the implicit template argument and its resolution at the given `offset`
     pub(crate) fn resolve_offset_in_format_args(
         &self,
         db: &'db dyn HirDatabase,
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/auto_import.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/auto_import.rs
index d310e11011b..f3243d369a0 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/auto_import.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/auto_import.rs
@@ -128,11 +128,7 @@ pub(crate) fn auto_import(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<
             format!("Import `{import_name}`"),
             range,
             |builder| {
-                let scope = match scope.clone() {
-                    ImportScope::File(it) => ImportScope::File(builder.make_mut(it)),
-                    ImportScope::Module(it) => ImportScope::Module(builder.make_mut(it)),
-                    ImportScope::Block(it) => ImportScope::Block(builder.make_mut(it)),
-                };
+                let scope = builder.make_import_scope_mut(scope.clone());
                 insert_use(&scope, mod_path_to_ast(&import_path, edition), &ctx.config.insert_use);
             },
         );
@@ -153,11 +149,7 @@ pub(crate) fn auto_import(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<
                     format!("Import `{import_name} as _`"),
                     range,
                     |builder| {
-                        let scope = match scope.clone() {
-                            ImportScope::File(it) => ImportScope::File(builder.make_mut(it)),
-                            ImportScope::Module(it) => ImportScope::Module(builder.make_mut(it)),
-                            ImportScope::Block(it) => ImportScope::Block(builder.make_mut(it)),
-                        };
+                        let scope = builder.make_import_scope_mut(scope.clone());
                         insert_use_as_alias(
                             &scope,
                             mod_path_to_ast(&import_path, edition),
@@ -1877,4 +1869,30 @@ fn main() {
 ",
         );
     }
+
+    #[test]
+    fn carries_cfg_attr() {
+        check_assist(
+            auto_import,
+            r#"
+mod m {
+    pub struct S;
+}
+
+#[cfg(test)]
+fn foo(_: S$0) {}
+"#,
+            r#"
+#[cfg(test)]
+use m::S;
+
+mod m {
+    pub struct S;
+}
+
+#[cfg(test)]
+fn foo(_: S) {}
+"#,
+        );
+    }
 }
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_bool_to_enum.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_bool_to_enum.rs
index 00e9fdf124d..f73b8c4fd0f 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_bool_to_enum.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_bool_to_enum.rs
@@ -312,12 +312,8 @@ fn replace_usages(
                 }
 
                 // add imports across modules where needed
-                if let Some((import_scope, path)) = import_data {
-                    let scope = match import_scope {
-                        ImportScope::File(it) => ImportScope::File(edit.make_mut(it)),
-                        ImportScope::Module(it) => ImportScope::Module(edit.make_mut(it)),
-                        ImportScope::Block(it) => ImportScope::Block(edit.make_mut(it)),
-                    };
+                if let Some((scope, path)) = import_data {
+                    let scope = edit.make_import_scope_mut(scope);
                     delayed_mutations.push((scope, path));
                 }
             },
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_named_struct_to_tuple_struct.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_named_struct_to_tuple_struct.rs
index ed8aad7b2c6..5d75e445861 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_named_struct_to_tuple_struct.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_named_struct_to_tuple_struct.rs
@@ -996,7 +996,8 @@ pub struct $0Foo {
 }
 "#,
             r#"
-pub struct Foo(#[my_custom_attr] u32);
+pub struct Foo(#[my_custom_attr]
+u32);
 "#,
         );
     }
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_tuple_struct_to_named_struct.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_tuple_struct_to_named_struct.rs
index 777e366da95..0c0b93bcfbc 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_tuple_struct_to_named_struct.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_tuple_struct_to_named_struct.rs
@@ -923,7 +923,8 @@ where
 pub struct $0Foo(#[my_custom_attr] u32);
 "#,
             r#"
-pub struct Foo { #[my_custom_attr] field1: u32 }
+pub struct Foo { #[my_custom_attr]
+field1: u32 }
 "#,
         );
     }
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/extract_function.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/extract_function.rs
index e977798c4fd..cf45ea0a30d 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/extract_function.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/extract_function.rs
@@ -204,12 +204,7 @@ pub(crate) fn extract_function(acc: &mut Assists, ctx: &AssistContext<'_>) -> Op
                 .kind
                 .is_some_and(|kind| matches!(kind, FlowKind::Break(_, _) | FlowKind::Continue(_)))
             {
-                let scope = match scope {
-                    ImportScope::File(it) => ImportScope::File(builder.make_mut(it)),
-                    ImportScope::Module(it) => ImportScope::Module(builder.make_mut(it)),
-                    ImportScope::Block(it) => ImportScope::Block(builder.make_mut(it)),
-                };
-
+                let scope = builder.make_import_scope_mut(scope);
                 let control_flow_enum =
                     FamousDefs(&ctx.sema, module.krate()).core_ops_ControlFlow();
 
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/replace_qualified_name_with_use.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/replace_qualified_name_with_use.rs
index c067747bc1b..fa005a411d3 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/replace_qualified_name_with_use.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/replace_qualified_name_with_use.rs
@@ -81,11 +81,7 @@ pub(crate) fn replace_qualified_name_with_use(
         |builder| {
             // Now that we've brought the name into scope, re-qualify all paths that could be
             // affected (that is, all paths inside the node we added the `use` to).
-            let scope = match scope {
-                ImportScope::File(it) => ImportScope::File(builder.make_mut(it)),
-                ImportScope::Module(it) => ImportScope::Module(builder.make_mut(it)),
-                ImportScope::Block(it) => ImportScope::Block(builder.make_mut(it)),
-            };
+            let scope = builder.make_import_scope_mut(scope);
             shorten_paths(scope.as_syntax_node(), &original_path);
             let path = drop_generic_args(&original_path);
             let edition = ctx
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/unqualify_method_call.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/unqualify_method_call.rs
index ebb8ef99100..1f89a3d5f17 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/unqualify_method_call.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/unqualify_method_call.rs
@@ -1,4 +1,3 @@
-use ide_db::imports::insert_use::ImportScope;
 use syntax::{
     TextRange,
     ast::{self, AstNode, HasArgList, prec::ExprPrecedence},
@@ -114,11 +113,7 @@ fn add_import(
         );
 
         if let Some(scope) = scope {
-            let scope = match scope {
-                ImportScope::File(it) => ImportScope::File(edit.make_mut(it)),
-                ImportScope::Module(it) => ImportScope::Module(edit.make_mut(it)),
-                ImportScope::Block(it) => ImportScope::Block(edit.make_mut(it)),
-            };
+            let scope = edit.make_import_scope_mut(scope);
             ide_db::imports::insert_use::insert_use(&scope, import, &ctx.config.insert_use);
         }
     }
diff --git a/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use.rs b/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use.rs
index d26e5d62ced..813f38380f6 100644
--- a/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use.rs
+++ b/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use.rs
@@ -60,107 +60,87 @@ pub struct InsertUseConfig {
 }
 
 #[derive(Debug, Clone)]
-pub enum ImportScope {
+pub struct ImportScope {
+    pub kind: ImportScopeKind,
+    pub required_cfgs: Vec<ast::Attr>,
+}
+
+#[derive(Debug, Clone)]
+pub enum ImportScopeKind {
     File(ast::SourceFile),
     Module(ast::ItemList),
     Block(ast::StmtList),
 }
 
 impl ImportScope {
-    // FIXME: Remove this?
-    #[cfg(test)]
-    fn from(syntax: SyntaxNode) -> Option<Self> {
-        use syntax::match_ast;
-        fn contains_cfg_attr(attrs: &dyn HasAttrs) -> bool {
-            attrs.attrs().any(|attr| attr.as_simple_call().is_some_and(|(ident, _)| ident == "cfg"))
-        }
-        match_ast! {
-            match syntax {
-                ast::Module(module) => module.item_list().map(ImportScope::Module),
-                ast::SourceFile(file) => Some(ImportScope::File(file)),
-                ast::Fn(func) => contains_cfg_attr(&func).then(|| func.body().and_then(|it| it.stmt_list().map(ImportScope::Block))).flatten(),
-                ast::Const(konst) => contains_cfg_attr(&konst).then(|| match konst.body()? {
-                    ast::Expr::BlockExpr(block) => Some(block),
-                    _ => None,
-                }).flatten().and_then(|it| it.stmt_list().map(ImportScope::Block)),
-                ast::Static(statik) => contains_cfg_attr(&statik).then(|| match statik.body()? {
-                    ast::Expr::BlockExpr(block) => Some(block),
-                    _ => None,
-                }).flatten().and_then(|it| it.stmt_list().map(ImportScope::Block)),
-                _ => None,
-
-            }
-        }
-    }
-
     /// Determines the containing syntax node in which to insert a `use` statement affecting `position`.
     /// Returns the original source node inside attributes.
     pub fn find_insert_use_container(
         position: &SyntaxNode,
         sema: &Semantics<'_, RootDatabase>,
     ) -> Option<Self> {
-        fn contains_cfg_attr(attrs: &dyn HasAttrs) -> bool {
-            attrs.attrs().any(|attr| attr.as_simple_call().is_some_and(|(ident, _)| ident == "cfg"))
-        }
-
+        // The closest block expression ancestor
+        let mut block = None;
+        let mut required_cfgs = Vec::new();
         // Walk up the ancestor tree searching for a suitable node to do insertions on
         // with special handling on cfg-gated items, in which case we want to insert imports locally
         // or FIXME: annotate inserted imports with the same cfg
         for syntax in sema.ancestors_with_macros(position.clone()) {
             if let Some(file) = ast::SourceFile::cast(syntax.clone()) {
-                return Some(ImportScope::File(file));
-            } else if let Some(item) = ast::Item::cast(syntax) {
-                return match item {
-                    ast::Item::Const(konst) if contains_cfg_attr(&konst) => {
-                        // FIXME: Instead of bailing out with None, we should note down that
-                        // this import needs an attribute added
-                        match sema.original_ast_node(konst)?.body()? {
-                            ast::Expr::BlockExpr(block) => block,
-                            _ => return None,
+                return Some(ImportScope { kind: ImportScopeKind::File(file), required_cfgs });
+            } else if let Some(module) = ast::Module::cast(syntax.clone()) {
+                // early return is important here, if we can't find the original module
+                // in the input there is no way for us to insert an import anywhere.
+                return sema
+                    .original_ast_node(module)?
+                    .item_list()
+                    .map(ImportScopeKind::Module)
+                    .map(|kind| ImportScope { kind, required_cfgs });
+            } else if let Some(has_attrs) = ast::AnyHasAttrs::cast(syntax) {
+                if block.is_none() {
+                    if let Some(b) = ast::BlockExpr::cast(has_attrs.syntax().clone()) {
+                        if let Some(b) = sema.original_ast_node(b) {
+                            block = b.stmt_list();
                         }
-                        .stmt_list()
-                        .map(ImportScope::Block)
                     }
-                    ast::Item::Fn(func) if contains_cfg_attr(&func) => {
-                        // FIXME: Instead of bailing out with None, we should note down that
-                        // this import needs an attribute added
-                        sema.original_ast_node(func)?.body()?.stmt_list().map(ImportScope::Block)
-                    }
-                    ast::Item::Static(statik) if contains_cfg_attr(&statik) => {
-                        // FIXME: Instead of bailing out with None, we should note down that
-                        // this import needs an attribute added
-                        match sema.original_ast_node(statik)?.body()? {
-                            ast::Expr::BlockExpr(block) => block,
-                            _ => return None,
-                        }
-                        .stmt_list()
-                        .map(ImportScope::Block)
-                    }
-                    ast::Item::Module(module) => {
-                        // early return is important here, if we can't find the original module
-                        // in the input there is no way for us to insert an import anywhere.
-                        sema.original_ast_node(module)?.item_list().map(ImportScope::Module)
+                }
+                if has_attrs
+                    .attrs()
+                    .any(|attr| attr.as_simple_call().is_some_and(|(ident, _)| ident == "cfg"))
+                {
+                    if let Some(b) = block {
+                        return Some(ImportScope {
+                            kind: ImportScopeKind::Block(b),
+                            required_cfgs,
+                        });
                     }
-                    _ => continue,
-                };
+                    required_cfgs.extend(has_attrs.attrs().filter(|attr| {
+                        attr.as_simple_call().is_some_and(|(ident, _)| ident == "cfg")
+                    }));
+                }
             }
         }
         None
     }
 
     pub fn as_syntax_node(&self) -> &SyntaxNode {
-        match self {
-            ImportScope::File(file) => file.syntax(),
-            ImportScope::Module(item_list) => item_list.syntax(),
-            ImportScope::Block(block) => block.syntax(),
+        match &self.kind {
+            ImportScopeKind::File(file) => file.syntax(),
+            ImportScopeKind::Module(item_list) => item_list.syntax(),
+            ImportScopeKind::Block(block) => block.syntax(),
         }
     }
 
     pub fn clone_for_update(&self) -> Self {
-        match self {
-            ImportScope::File(file) => ImportScope::File(file.clone_for_update()),
-            ImportScope::Module(item_list) => ImportScope::Module(item_list.clone_for_update()),
-            ImportScope::Block(block) => ImportScope::Block(block.clone_for_update()),
+        Self {
+            kind: match &self.kind {
+                ImportScopeKind::File(file) => ImportScopeKind::File(file.clone_for_update()),
+                ImportScopeKind::Module(item_list) => {
+                    ImportScopeKind::Module(item_list.clone_for_update())
+                }
+                ImportScopeKind::Block(block) => ImportScopeKind::Block(block.clone_for_update()),
+            },
+            required_cfgs: self.required_cfgs.iter().map(|attr| attr.clone_for_update()).collect(),
         }
     }
 }
@@ -216,6 +196,11 @@ fn insert_use_with_alias_option(
         use_tree.wrap_in_tree_list();
     }
     let use_item = make::use_(None, use_tree).clone_for_update();
+    for attr in
+        scope.required_cfgs.iter().map(|attr| attr.syntax().clone_subtree().clone_for_update())
+    {
+        ted::insert(ted::Position::first_child_of(use_item.syntax()), attr);
+    }
 
     // merge into existing imports if possible
     if let Some(mb) = mb {
@@ -229,7 +214,6 @@ fn insert_use_with_alias_option(
             }
         }
     }
-
     // either we weren't allowed to merge or there is no import that fits the merge conditions
     // so look for the place we have to insert to
     insert_use_(scope, use_item, cfg.group);
@@ -316,10 +300,10 @@ fn guess_granularity_from_scope(scope: &ImportScope) -> ImportGranularityGuess {
         }
         _ => None,
     };
-    let mut use_stmts = match scope {
-        ImportScope::File(f) => f.items(),
-        ImportScope::Module(m) => m.items(),
-        ImportScope::Block(b) => b.items(),
+    let mut use_stmts = match &scope.kind {
+        ImportScopeKind::File(f) => f.items(),
+        ImportScopeKind::Module(m) => m.items(),
+        ImportScopeKind::Block(b) => b.items(),
     }
     .filter_map(use_stmt);
     let mut res = ImportGranularityGuess::Unknown;
@@ -463,12 +447,12 @@ fn insert_use_(scope: &ImportScope, use_item: ast::Use, group_imports: bool) {
         }
     }
 
-    let l_curly = match scope {
-        ImportScope::File(_) => None,
+    let l_curly = match &scope.kind {
+        ImportScopeKind::File(_) => None,
         // don't insert the imports before the item list/block expr's opening curly brace
-        ImportScope::Module(item_list) => item_list.l_curly_token(),
+        ImportScopeKind::Module(item_list) => item_list.l_curly_token(),
         // don't insert the imports before the item list's opening curly brace
-        ImportScope::Block(block) => block.l_curly_token(),
+        ImportScopeKind::Block(block) => block.l_curly_token(),
     };
     // there are no imports in this file at all
     // so put the import after all inner module attributes and possible license header comments
diff --git a/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use/tests.rs b/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use/tests.rs
index 428ba1d5118..4a00854f01a 100644
--- a/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use/tests.rs
+++ b/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use/tests.rs
@@ -23,7 +23,7 @@ struct Struct;
 }
 
 #[test]
-fn respects_cfg_attr_fn() {
+fn respects_cfg_attr_fn_body() {
     check(
         r"bar::Bar",
         r#"
@@ -41,6 +41,25 @@ fn foo() {
 }
 
 #[test]
+fn respects_cfg_attr_fn_sig() {
+    check(
+        r"bar::Bar",
+        r#"
+#[cfg(test)]
+fn foo($0) {}
+"#,
+        r#"
+#[cfg(test)]
+use bar::Bar;
+
+#[cfg(test)]
+fn foo() {}
+"#,
+        ImportGranularity::Crate,
+    );
+}
+
+#[test]
 fn respects_cfg_attr_const() {
     check(
         r"bar::Bar",
@@ -59,6 +78,51 @@ const FOO: Bar = {
 }
 
 #[test]
+fn respects_cfg_attr_impl() {
+    check(
+        r"bar::Bar",
+        r#"
+#[cfg(test)]
+impl () {$0}
+"#,
+        r#"
+#[cfg(test)]
+use bar::Bar;
+
+#[cfg(test)]
+impl () {}
+"#,
+        ImportGranularity::Crate,
+    );
+}
+
+#[test]
+fn respects_cfg_attr_multiple_layers() {
+    check(
+        r"bar::Bar",
+        r#"
+#[cfg(test)]
+impl () {
+    #[cfg(test2)]
+    fn f($0) {}
+}
+"#,
+        r#"
+#[cfg(test)]
+#[cfg(test2)]
+use bar::Bar;
+
+#[cfg(test)]
+impl () {
+    #[cfg(test2)]
+    fn f() {}
+}
+"#,
+        ImportGranularity::Crate,
+    );
+}
+
+#[test]
 fn insert_skips_lone_glob_imports() {
     check(
         "use foo::baz::A",
@@ -813,7 +877,7 @@ use {std::io};",
 }
 
 #[test]
-fn merge_groups_skip_attributed() {
+fn merge_groups_cfg_vs_no_cfg() {
     check_crate(
         "std::io",
         r#"
@@ -837,6 +901,25 @@ use {std::io};
 }
 
 #[test]
+fn merge_groups_cfg_matching() {
+    check_crate(
+        "std::io",
+        r#"
+#[cfg(feature = "gated")] use std::fmt::{Result, Display};
+
+#[cfg(feature = "gated")]
+fn f($0) {}
+"#,
+        r#"
+#[cfg(feature = "gated")] use std::{fmt::{Display, Result}, io};
+
+#[cfg(feature = "gated")]
+fn f() {}
+"#,
+    );
+}
+
+#[test]
 fn split_out_merge() {
     // FIXME: This is suboptimal, we want to get `use std::fmt::{self, Result}`
     // instead.
@@ -1259,12 +1342,14 @@ fn check_with_config(
     };
     let sema = &Semantics::new(&db);
     let source_file = sema.parse(file_id);
-    let syntax = source_file.syntax().clone_for_update();
     let file = pos
-        .and_then(|pos| syntax.token_at_offset(pos.expect_offset()).next()?.parent())
+        .and_then(|pos| source_file.syntax().token_at_offset(pos.expect_offset()).next()?.parent())
         .and_then(|it| ImportScope::find_insert_use_container(&it, sema))
-        .or_else(|| ImportScope::from(syntax))
-        .unwrap();
+        .unwrap_or_else(|| ImportScope {
+            kind: ImportScopeKind::File(source_file),
+            required_cfgs: vec![],
+        })
+        .clone_for_update();
     let path = ast::SourceFile::parse(&format!("use {path};"), span::Edition::CURRENT)
         .tree()
         .syntax()
@@ -1349,7 +1434,7 @@ fn check_merge_only_fail(ra_fixture0: &str, ra_fixture1: &str, mb: MergeBehavior
 }
 
 fn check_guess(#[rust_analyzer::rust_fixture] ra_fixture: &str, expected: ImportGranularityGuess) {
-    let syntax = ast::SourceFile::parse(ra_fixture, span::Edition::CURRENT).tree().syntax().clone();
-    let file = ImportScope::from(syntax).unwrap();
+    let syntax = ast::SourceFile::parse(ra_fixture, span::Edition::CURRENT).tree();
+    let file = ImportScope { kind: ImportScopeKind::File(syntax), required_cfgs: vec![] };
     assert_eq!(super::guess_granularity_from_scope(&file), expected);
 }
diff --git a/src/tools/rust-analyzer/crates/ide-db/src/search.rs b/src/tools/rust-analyzer/crates/ide-db/src/search.rs
index d4ab7592927..c5ad64ed594 100644
--- a/src/tools/rust-analyzer/crates/ide-db/src/search.rs
+++ b/src/tools/rust-analyzer/crates/ide-db/src/search.rs
@@ -961,12 +961,16 @@ impl<'a> FindUsages<'a> {
             // Search for occurrences of the items name
             for offset in Self::match_indices(&text, finder, search_range) {
                 let ret = tree.token_at_offset(offset).any(|token| {
-                    let Some(str_token) = ast::String::cast(token.clone()) else { return false };
-                    if let Some((range, Some(nameres))) =
-                        sema.check_for_format_args_template(token, offset)
+                    if let Some((range, _frange, string_token, Some(nameres))) =
+                        sema.check_for_format_args_template(token.clone(), offset)
                     {
-                        return self
-                            .found_format_args_ref(file_id, range, str_token, nameres, sink);
+                        return self.found_format_args_ref(
+                            file_id,
+                            range,
+                            string_token,
+                            nameres,
+                            sink,
+                        );
                     }
                     false
                 });
diff --git a/src/tools/rust-analyzer/crates/ide-db/src/source_change.rs b/src/tools/rust-analyzer/crates/ide-db/src/source_change.rs
index b1b58d6568c..16c0d8d97a7 100644
--- a/src/tools/rust-analyzer/crates/ide-db/src/source_change.rs
+++ b/src/tools/rust-analyzer/crates/ide-db/src/source_change.rs
@@ -5,6 +5,7 @@
 
 use std::{collections::hash_map::Entry, fmt, iter, mem};
 
+use crate::imports::insert_use::{ImportScope, ImportScopeKind};
 use crate::text_edit::{TextEdit, TextEditBuilder};
 use crate::{SnippetCap, assists::Command, syntax_helpers::tree_diff::diff};
 use base_db::AnchoredPathBuf;
@@ -367,6 +368,17 @@ impl SourceChangeBuilder {
     pub fn make_mut<N: AstNode>(&mut self, node: N) -> N {
         self.mutated_tree.get_or_insert_with(|| TreeMutator::new(node.syntax())).make_mut(&node)
     }
+
+    pub fn make_import_scope_mut(&mut self, scope: ImportScope) -> ImportScope {
+        ImportScope {
+            kind: match scope.kind.clone() {
+                ImportScopeKind::File(it) => ImportScopeKind::File(self.make_mut(it)),
+                ImportScopeKind::Module(it) => ImportScopeKind::Module(self.make_mut(it)),
+                ImportScopeKind::Block(it) => ImportScopeKind::Block(self.make_mut(it)),
+            },
+            required_cfgs: scope.required_cfgs.iter().map(|it| self.make_mut(it.clone())).collect(),
+        }
+    }
     /// Returns a copy of the `node`, suitable for mutation.
     ///
     /// Syntax trees in rust-analyzer are typically immutable, and mutating
diff --git a/src/tools/rust-analyzer/crates/ide-diagnostics/src/handlers/json_is_not_rust.rs b/src/tools/rust-analyzer/crates/ide-diagnostics/src/handlers/json_is_not_rust.rs
index ac1b599c49e..87c9397fb77 100644
--- a/src/tools/rust-analyzer/crates/ide-diagnostics/src/handlers/json_is_not_rust.rs
+++ b/src/tools/rust-analyzer/crates/ide-diagnostics/src/handlers/json_is_not_rust.rs
@@ -137,11 +137,7 @@ pub(crate) fn json_in_items(
                     )
                     .with_fixes(Some(vec![{
                         let mut scb = SourceChangeBuilder::new(vfs_file_id);
-                        let scope = match import_scope {
-                            ImportScope::File(it) => ImportScope::File(scb.make_mut(it)),
-                            ImportScope::Module(it) => ImportScope::Module(scb.make_mut(it)),
-                            ImportScope::Block(it) => ImportScope::Block(scb.make_mut(it)),
-                        };
+                        let scope = scb.make_import_scope_mut(import_scope);
                         let current_module = semantics_scope.module();
 
                         let cfg = ImportPathConfig {
diff --git a/src/tools/rust-analyzer/crates/ide/src/goto_definition.rs b/src/tools/rust-analyzer/crates/ide/src/goto_definition.rs
index c60ca3562f6..7917aab8bf7 100644
--- a/src/tools/rust-analyzer/crates/ide/src/goto_definition.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/goto_definition.rs
@@ -67,7 +67,7 @@ pub(crate) fn goto_definition(
         });
     }
 
-    if let Some((range, resolution)) =
+    if let Some((range, _, _, resolution)) =
         sema.check_for_format_args_template(original_token.clone(), offset)
     {
         return Some(RangeInfo::new(
diff --git a/src/tools/rust-analyzer/crates/ide/src/goto_type_definition.rs b/src/tools/rust-analyzer/crates/ide/src/goto_type_definition.rs
index a78f5cdc9d0..a6c7ea29b09 100644
--- a/src/tools/rust-analyzer/crates/ide/src/goto_type_definition.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/goto_type_definition.rs
@@ -53,7 +53,9 @@ pub(crate) fn goto_type_definition(
             }
         });
     };
-    if let Some((range, resolution)) = sema.check_for_format_args_template(token.clone(), offset) {
+    if let Some((range, _, _, resolution)) =
+        sema.check_for_format_args_template(token.clone(), offset)
+    {
         if let Some(ty) = resolution.and_then(|res| match Definition::from(res) {
             Definition::Const(it) => Some(it.ty(db)),
             Definition::Static(it) => Some(it.ty(db)),
diff --git a/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs b/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs
index 520ba39a238..aa947921a9b 100644
--- a/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs
@@ -11,7 +11,6 @@ use ide_db::{
         preorder_expr_with_ctx_checker,
     },
 };
-use span::FileId;
 use syntax::{
     AstNode,
     SyntaxKind::{self, IDENT, INT_NUMBER},
@@ -61,13 +60,12 @@ pub(crate) fn highlight_related(
     let file_id = sema
         .attach_first_edition(file_id)
         .unwrap_or_else(|| EditionedFileId::current_edition(sema.db, file_id));
-    let span_file_id = file_id.editioned_file_id(sema.db);
     let syntax = sema.parse(file_id).syntax().clone();
 
     let token = pick_best_token(syntax.token_at_offset(offset), |kind| match kind {
         T![?] => 4, // prefer `?` when the cursor is sandwiched like in `await$0?`
         T![->] => 4,
-        kind if kind.is_keyword(span_file_id.edition()) => 3,
+        kind if kind.is_keyword(file_id.edition(sema.db)) => 3,
         IDENT | INT_NUMBER => 2,
         T![|] => 1,
         _ => 0,
@@ -92,18 +90,11 @@ pub(crate) fn highlight_related(
         T![unsafe] if token.parent().and_then(ast::BlockExpr::cast).is_some() => {
             highlight_unsafe_points(sema, token).remove(&file_id)
         }
-        T![|] if config.closure_captures => {
-            highlight_closure_captures(sema, token, file_id, span_file_id.file_id())
+        T![|] if config.closure_captures => highlight_closure_captures(sema, token, file_id),
+        T![move] if config.closure_captures => highlight_closure_captures(sema, token, file_id),
+        _ if config.references => {
+            highlight_references(sema, token, FilePosition { file_id, offset })
         }
-        T![move] if config.closure_captures => {
-            highlight_closure_captures(sema, token, file_id, span_file_id.file_id())
-        }
-        _ if config.references => highlight_references(
-            sema,
-            token,
-            FilePosition { file_id, offset },
-            span_file_id.file_id(),
-        ),
         _ => None,
     }
 }
@@ -112,7 +103,6 @@ fn highlight_closure_captures(
     sema: &Semantics<'_, RootDatabase>,
     token: SyntaxToken,
     file_id: EditionedFileId,
-    vfs_file_id: FileId,
 ) -> Option<Vec<HighlightedRange>> {
     let closure = token.parent_ancestors().take(2).find_map(ast::ClosureExpr::cast)?;
     let search_range = closure.body()?.syntax().text_range();
@@ -145,7 +135,7 @@ fn highlight_closure_captures(
                     .sources(sema.db)
                     .into_iter()
                     .flat_map(|x| x.to_nav(sema.db))
-                    .filter(|decl| decl.file_id == vfs_file_id)
+                    .filter(|decl| decl.file_id == file_id.file_id(sema.db))
                     .filter_map(|decl| decl.focus_range)
                     .map(move |range| HighlightedRange { range, category })
                     .chain(usages)
@@ -158,9 +148,8 @@ fn highlight_references(
     sema: &Semantics<'_, RootDatabase>,
     token: SyntaxToken,
     FilePosition { file_id, offset }: FilePosition,
-    vfs_file_id: FileId,
 ) -> Option<Vec<HighlightedRange>> {
-    let defs = if let Some((range, resolution)) =
+    let defs = if let Some((range, _, _, resolution)) =
         sema.check_for_format_args_template(token.clone(), offset)
     {
         match resolution.map(Definition::from) {
@@ -270,7 +259,7 @@ fn highlight_references(
                     .sources(sema.db)
                     .into_iter()
                     .flat_map(|x| x.to_nav(sema.db))
-                    .filter(|decl| decl.file_id == vfs_file_id)
+                    .filter(|decl| decl.file_id == file_id.file_id(sema.db))
                     .filter_map(|decl| decl.focus_range)
                     .map(|range| HighlightedRange { range, category })
                     .for_each(|x| {
@@ -288,7 +277,7 @@ fn highlight_references(
                     },
                 };
                 for nav in navs {
-                    if nav.file_id != vfs_file_id {
+                    if nav.file_id != file_id.file_id(sema.db) {
                         continue;
                     }
                     let hl_range = nav.focus_range.map(|range| {
diff --git a/src/tools/rust-analyzer/crates/ide/src/hover.rs b/src/tools/rust-analyzer/crates/ide/src/hover.rs
index 8bb1c708e25..5404a9dc2ce 100644
--- a/src/tools/rust-analyzer/crates/ide/src/hover.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/hover.rs
@@ -200,7 +200,7 @@ fn hover_offset(
         });
     }
 
-    if let Some((range, resolution)) =
+    if let Some((range, _, _, resolution)) =
         sema.check_for_format_args_template(original_token.clone(), offset)
     {
         let res = hover_for_definition(
diff --git a/src/tools/rust-analyzer/crates/ide/src/lib.rs b/src/tools/rust-analyzer/crates/ide/src/lib.rs
index d649dffbd90..82dbcde4c06 100644
--- a/src/tools/rust-analyzer/crates/ide/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/lib.rs
@@ -514,7 +514,6 @@ impl Analysis {
         self.with_db(|db| goto_type_definition::goto_type_definition(db, position))
     }
 
-    /// Finds all usages of the reference at point.
     pub fn find_all_refs(
         &self,
         position: FilePosition,
diff --git a/src/tools/rust-analyzer/crates/ide/src/references.rs b/src/tools/rust-analyzer/crates/ide/src/references.rs
index 4fa116444b7..c6a323d4081 100644
--- a/src/tools/rust-analyzer/crates/ide/src/references.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/references.rs
@@ -8,6 +8,14 @@
 //! for text occurrences of the identifier. If there's an `ast::NameRef`
 //! at the index that the match starts at and its tree parent is
 //! resolved to the search element definition, we get a reference.
+//!
+//! Special handling for constructors/initializations:
+//! When searching for references to a struct/enum/variant, if the cursor is positioned on:
+//! - `{` after a struct/enum/variant definition
+//! - `(` for tuple structs/variants
+//! - `;` for unit structs
+//! - The type name in a struct/enum/variant definition
+//!   Then only constructor/initialization usages will be shown, filtering out other references.
 
 use hir::{PathResolution, Semantics};
 use ide_db::{
@@ -28,27 +36,76 @@ use syntax::{
 
 use crate::{FilePosition, HighlightedRange, NavigationTarget, TryToNav, highlight_related};
 
+/// Result of a reference search operation.
 #[derive(Debug, Clone)]
 pub struct ReferenceSearchResult {
+    /// Information about the declaration site of the searched item.
+    /// For ADTs (structs/enums), this points to the type definition.
+    /// May be None for primitives or items without clear declaration sites.
     pub declaration: Option<Declaration>,
+    /// All references found, grouped by file.
+    /// For ADTs when searching from a constructor position (e.g. on '{', '(', ';'),
+    /// this only includes constructor/initialization usages.
+    /// The map key is the file ID, and the value is a vector of (range, category) pairs.
+    /// - range: The text range of the reference in the file
+    /// - category: Metadata about how the reference is used (read/write/etc)
     pub references: IntMap<FileId, Vec<(TextRange, ReferenceCategory)>>,
 }
 
+/// Information about the declaration site of a searched item.
 #[derive(Debug, Clone)]
 pub struct Declaration {
+    /// Navigation information to jump to the declaration
     pub nav: NavigationTarget,
+    /// Whether the declared item is mutable (relevant for variables)
     pub is_mut: bool,
 }
 
 // Feature: Find All References
 //
-// Shows all references of the item at the cursor location
+// Shows all references of the item at the cursor location. This includes:
+// - Direct references to variables, functions, types, etc.
+// - Constructor/initialization references when cursor is on struct/enum definition tokens
+// - References in patterns and type contexts
+// - References through dereferencing and borrowing
+// - References in macro expansions
+//
+// Special handling for constructors:
+// - When the cursor is on `{`, `(`, or `;` in a struct/enum definition
+// - When the cursor is on the type name in a struct/enum definition
+// These cases will show only constructor/initialization usages of the type
 //
 // | Editor  | Shortcut |
 // |---------|----------|
 // | VS Code | <kbd>Shift+Alt+F12</kbd> |
 //
 // ![Find All References](https://user-images.githubusercontent.com/48062697/113020670-b7c34f00-917a-11eb-8003-370ac5f2b3cb.gif)
+
+/// Find all references to the item at the given position.
+///
+/// # Arguments
+/// * `sema` - Semantic analysis context
+/// * `position` - Position in the file where to look for the item
+/// * `search_scope` - Optional scope to limit the search (e.g. current crate only)
+///
+/// # Returns
+/// Returns `None` if no valid item is found at the position.
+/// Otherwise returns a vector of `ReferenceSearchResult`, usually with one element.
+/// Multiple results can occur in case of ambiguity or when searching for trait items.
+///
+/// # Special cases
+/// - Control flow keywords (break, continue, etc): Shows all related jump points
+/// - Constructor search: When on struct/enum definition tokens (`{`, `(`, `;`), shows only initialization sites
+/// - Format string arguments: Shows template parameter usages
+/// - Lifetime parameters: Shows lifetime constraint usages
+///
+/// # Constructor search
+/// When the cursor is on specific tokens in a struct/enum definition:
+/// - `{` after struct/enum/variant: Shows record literal initializations
+/// - `(` after tuple struct/variant: Shows tuple literal initializations
+/// - `;` after unit struct: Shows unit literal initializations
+/// - Type name in definition: Shows all initialization usages
+///   In these cases, other kinds of references (like type references) are filtered out.
 pub(crate) fn find_all_refs(
     sema: &Semantics<'_, RootDatabase>,
     position: FilePosition,
@@ -143,7 +200,7 @@ pub(crate) fn find_defs(
         )
     })?;
 
-    if let Some((_, resolution)) = sema.check_for_format_args_template(token.clone(), offset) {
+    if let Some((.., resolution)) = sema.check_for_format_args_template(token.clone(), offset) {
         return resolution.map(Definition::from).map(|it| vec![it]);
     }
 
@@ -219,7 +276,19 @@ fn retain_adt_literal_usages(
     }
 }
 
-/// Returns `Some` if the cursor is at a position for an item to search for all its constructor/literal usages
+/// Returns `Some` if the cursor is at a position where we should search for constructor/initialization usages.
+/// This is used to implement the special constructor search behavior when the cursor is on specific tokens
+/// in a struct/enum/variant definition.
+///
+/// # Returns
+/// - `Some(name)` if the cursor is on:
+///   - `{` after a struct/enum/variant definition
+///   - `(` for tuple structs/variants
+///   - `;` for unit structs
+///   - The type name in a struct/enum/variant definition
+/// - `None` otherwise
+///
+/// The returned name is the name of the type whose constructor usages should be searched for.
 fn name_for_constructor_search(syntax: &SyntaxNode, position: FilePosition) -> Option<ast::Name> {
     let token = syntax.token_at_offset(position.offset).right_biased()?;
     let token_parent = token.parent()?;
@@ -257,6 +326,16 @@ fn name_for_constructor_search(syntax: &SyntaxNode, position: FilePosition) -> O
     }
 }
 
+/// Checks if a name reference is part of an enum variant literal expression.
+/// Used to filter references when searching for enum variant constructors.
+///
+/// # Arguments
+/// * `sema` - Semantic analysis context
+/// * `enum_` - The enum type to check against
+/// * `name_ref` - The name reference to check
+///
+/// # Returns
+/// `true` if the name reference is used as part of constructing a variant of the given enum.
 fn is_enum_lit_name_ref(
     sema: &Semantics<'_, RootDatabase>,
     enum_: hir::Enum,
@@ -284,12 +363,19 @@ fn is_enum_lit_name_ref(
         .unwrap_or(false)
 }
 
+/// Checks if a path ends with the given name reference.
+/// Helper function for checking constructor usage patterns.
 fn path_ends_with(path: Option<ast::Path>, name_ref: &ast::NameRef) -> bool {
     path.and_then(|path| path.segment())
         .and_then(|segment| segment.name_ref())
         .map_or(false, |segment| segment == *name_ref)
 }
 
+/// Checks if a name reference is used in a literal (constructor) context.
+/// Used to filter references when searching for struct/variant constructors.
+///
+/// # Returns
+/// `true` if the name reference is used as part of a struct/variant literal expression.
 fn is_lit_name_ref(name_ref: &ast::NameRef) -> bool {
     name_ref.syntax().ancestors().find_map(|ancestor| {
         match_ast! {
diff --git a/src/tools/rust-analyzer/crates/ide/src/rename.rs b/src/tools/rust-analyzer/crates/ide/src/rename.rs
index e6cda60cd95..0423e3da2c8 100644
--- a/src/tools/rust-analyzer/crates/ide/src/rename.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/rename.rs
@@ -203,7 +203,7 @@ fn find_definitions(
 ) -> RenameResult<impl Iterator<Item = (FileRange, SyntaxKind, Definition)>> {
     let token = syntax.token_at_offset(offset).find(|t| matches!(t.kind(), SyntaxKind::STRING));
 
-    if let Some((range, Some(resolution))) =
+    if let Some((range, _, _, Some(resolution))) =
         token.and_then(|token| sema.check_for_format_args_template(token, offset))
     {
         return Ok(vec![(
diff --git a/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting.rs b/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting.rs
index e1bc76318f8..3ca172977cb 100644
--- a/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting.rs
@@ -542,7 +542,7 @@ fn descend_token(
 
     let mut t = None;
     let mut r = 0;
-    sema.descend_into_macros_breakable(token.clone(), |tok, _ctx| {
+    sema.descend_into_macros_breakable(token.clone().into(), |tok, _ctx| {
         // FIXME: Consider checking ctx transparency for being opaque?
         let my_rank = ranker.rank_token(&tok.value);
 
diff --git a/src/tools/rust-analyzer/crates/mbe/src/tests.rs b/src/tools/rust-analyzer/crates/mbe/src/tests.rs
index 3369dfff281..769455faac0 100644
--- a/src/tools/rust-analyzer/crates/mbe/src/tests.rs
+++ b/src/tools/rust-analyzer/crates/mbe/src/tests.rs
@@ -74,7 +74,8 @@ fn check_(
         "{}",
         syntax_bridge::prettify_macro_expansion::prettify_macro_expansion(
             node.syntax_node(),
-            &mut |it| it.clone()
+            &mut |_| None,
+            |_| ()
         )
     );
     expect.assert_eq(&expect_res);
diff --git a/src/tools/rust-analyzer/crates/rust-analyzer/src/handlers/dispatch.rs b/src/tools/rust-analyzer/crates/rust-analyzer/src/handlers/dispatch.rs
index f04ada38893..40d05567fcc 100644
--- a/src/tools/rust-analyzer/crates/rust-analyzer/src/handlers/dispatch.rs
+++ b/src/tools/rust-analyzer/crates/rust-analyzer/src/handlers/dispatch.rs
@@ -6,7 +6,7 @@ use std::{
 
 use ide_db::base_db::{
     DbPanicContext,
-    salsa::{self, Cancelled},
+    salsa::{self, Cancelled, UnexpectedCycle},
 };
 use lsp_server::{ExtractError, Response, ResponseError};
 use serde::{Serialize, de::DeserializeOwned};
@@ -349,11 +349,14 @@ where
             let mut message = "request handler panicked".to_owned();
             if let Some(panic_message) = panic_message {
                 message.push_str(": ");
-                message.push_str(panic_message)
+                message.push_str(panic_message);
+            } else if let Some(cycle) = panic.downcast_ref::<UnexpectedCycle>() {
+                tracing::error!("{cycle}");
+                message.push_str(": unexpected cycle");
             } else if let Ok(cancelled) = panic.downcast::<Cancelled>() {
                 tracing::error!("Cancellation propagated out of salsa! This is a bug");
                 return Err(HandlerCancelledError::Inner(*cancelled));
-            }
+            };
 
             Ok(lsp_server::Response::new_err(
                 id,
diff --git a/src/tools/rust-analyzer/crates/rust-analyzer/src/lsp/from_proto.rs b/src/tools/rust-analyzer/crates/rust-analyzer/src/lsp/from_proto.rs
index fb8a9838290..02757616d4f 100644
--- a/src/tools/rust-analyzer/crates/rust-analyzer/src/lsp/from_proto.rs
+++ b/src/tools/rust-analyzer/crates/rust-analyzer/src/lsp/from_proto.rs
@@ -103,6 +103,7 @@ pub(crate) fn file_range_uri(
 
 pub(crate) fn assist_kind(kind: lsp_types::CodeActionKind) -> Option<AssistKind> {
     let assist_kind = match &kind {
+        k if k == &lsp_types::CodeActionKind::EMPTY => AssistKind::Generate,
         k if k == &lsp_types::CodeActionKind::QUICKFIX => AssistKind::QuickFix,
         k if k == &lsp_types::CodeActionKind::REFACTOR => AssistKind::Refactor,
         k if k == &lsp_types::CodeActionKind::REFACTOR_EXTRACT => AssistKind::RefactorExtract,
diff --git a/src/tools/rust-analyzer/crates/span/src/lib.rs b/src/tools/rust-analyzer/crates/span/src/lib.rs
index 54f90908f36..f81648ac42c 100644
--- a/src/tools/rust-analyzer/crates/span/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/span/src/lib.rs
@@ -112,7 +112,10 @@ pub struct EditionedFileId(u32);
 
 impl fmt::Debug for EditionedFileId {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_tuple("EditionedFileId").field(&self.file_id()).field(&self.edition()).finish()
+        f.debug_tuple("EditionedFileId")
+            .field(&self.file_id().index())
+            .field(&self.edition())
+            .finish()
     }
 }
 
diff --git a/src/tools/rust-analyzer/crates/syntax-bridge/src/prettify_macro_expansion.rs b/src/tools/rust-analyzer/crates/syntax-bridge/src/prettify_macro_expansion.rs
index e815e07d80a..0a5c8df0d0a 100644
--- a/src/tools/rust-analyzer/crates/syntax-bridge/src/prettify_macro_expansion.rs
+++ b/src/tools/rust-analyzer/crates/syntax-bridge/src/prettify_macro_expansion.rs
@@ -7,6 +7,13 @@ use syntax::{
     ted::{self, Position},
 };
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum PrettifyWsKind {
+    Space,
+    Indent(usize),
+    Newline,
+}
+
 /// Renders a [`SyntaxNode`] with whitespace inserted between tokens that require them.
 ///
 /// This is an internal API that is only exported because `mbe` needs it for tests and cannot depend
@@ -15,7 +22,8 @@ use syntax::{
 #[deprecated = "use `hir_expand::prettify_macro_expansion()` instead"]
 pub fn prettify_macro_expansion(
     syn: SyntaxNode,
-    dollar_crate_replacement: &mut dyn FnMut(&SyntaxToken) -> SyntaxToken,
+    dollar_crate_replacement: &mut dyn FnMut(&SyntaxToken) -> Option<SyntaxToken>,
+    inspect_mods: impl FnOnce(&[(Position, PrettifyWsKind)]),
 ) -> SyntaxNode {
     let mut indent = 0;
     let mut last: Option<SyntaxKind> = None;
@@ -27,14 +35,12 @@ pub fn prettify_macro_expansion(
     let after = Position::after;
 
     let do_indent = |pos: fn(_) -> Position, token: &SyntaxToken, indent| {
-        (pos(token.clone()), make::tokens::whitespace(&" ".repeat(4 * indent)))
-    };
-    let do_ws = |pos: fn(_) -> Position, token: &SyntaxToken| {
-        (pos(token.clone()), make::tokens::single_space())
-    };
-    let do_nl = |pos: fn(_) -> Position, token: &SyntaxToken| {
-        (pos(token.clone()), make::tokens::single_newline())
+        (pos(token.clone()), PrettifyWsKind::Indent(indent))
     };
+    let do_ws =
+        |pos: fn(_) -> Position, token: &SyntaxToken| (pos(token.clone()), PrettifyWsKind::Space);
+    let do_nl =
+        |pos: fn(_) -> Position, token: &SyntaxToken| (pos(token.clone()), PrettifyWsKind::Newline);
 
     for event in syn.preorder_with_tokens() {
         let token = match event {
@@ -46,20 +52,19 @@ pub fn prettify_macro_expansion(
                 ) =>
             {
                 if indent > 0 {
-                    mods.push((
-                        Position::after(node.clone()),
-                        make::tokens::whitespace(&" ".repeat(4 * indent)),
-                    ));
+                    mods.push((Position::after(node.clone()), PrettifyWsKind::Indent(indent)));
                 }
                 if node.parent().is_some() {
-                    mods.push((Position::after(node), make::tokens::single_newline()));
+                    mods.push((Position::after(node), PrettifyWsKind::Newline));
                 }
                 continue;
             }
             _ => continue,
         };
         if token.kind() == SyntaxKind::IDENT && token.text() == "$crate" {
-            dollar_crate_replacements.push((token.clone(), dollar_crate_replacement(&token)));
+            if let Some(replacement) = dollar_crate_replacement(&token) {
+                dollar_crate_replacements.push((token.clone(), replacement));
+            }
         }
         let tok = &token;
 
@@ -129,8 +134,16 @@ pub fn prettify_macro_expansion(
         last = Some(tok.kind());
     }
 
+    inspect_mods(&mods);
     for (pos, insert) in mods {
-        ted::insert(pos, insert);
+        ted::insert_raw(
+            pos,
+            match insert {
+                PrettifyWsKind::Space => make::tokens::single_space(),
+                PrettifyWsKind::Indent(indent) => make::tokens::whitespace(&" ".repeat(4 * indent)),
+                PrettifyWsKind::Newline => make::tokens::single_newline(),
+            },
+        );
     }
     for (old, new) in dollar_crate_replacements {
         ted::replace(old, new);
diff --git a/src/tools/rust-analyzer/crates/syntax/src/ted.rs b/src/tools/rust-analyzer/crates/syntax/src/ted.rs
index 64d5ea084c1..6fcbdd006c2 100644
--- a/src/tools/rust-analyzer/crates/syntax/src/ted.rs
+++ b/src/tools/rust-analyzer/crates/syntax/src/ted.rs
@@ -5,6 +5,7 @@
 use std::{mem, ops::RangeInclusive};
 
 use parser::T;
+use rowan::TextSize;
 
 use crate::{
     SyntaxElement, SyntaxKind, SyntaxNode, SyntaxToken,
@@ -74,6 +75,12 @@ impl Position {
         };
         Position { repr }
     }
+    pub fn offset(&self) -> TextSize {
+        match &self.repr {
+            PositionRepr::FirstChild(node) => node.text_range().start(),
+            PositionRepr::After(elem) => elem.text_range().end(),
+        }
+    }
 }
 
 pub fn insert(position: Position, elem: impl Element) {
@@ -207,5 +214,12 @@ fn ws_between(left: &SyntaxElement, right: &SyntaxElement) -> Option<SyntaxToken
         }
         return Some(make::tokens::whitespace(&format!("\n{indent}")));
     }
+    if left.kind() == SyntaxKind::ATTR {
+        let mut indent = IndentLevel::from_element(right);
+        if right.kind() == SyntaxKind::ATTR {
+            indent.0 = IndentLevel::from_element(left).0.max(indent.0);
+        }
+        return Some(make::tokens::whitespace(&format!("\n{indent}")));
+    }
     Some(make::tokens::single_space())
 }
diff --git a/src/tools/rust-analyzer/crates/vfs/src/vfs_path.rs b/src/tools/rust-analyzer/crates/vfs/src/vfs_path.rs
index c35b7f229f6..7e2c787afc7 100644
--- a/src/tools/rust-analyzer/crates/vfs/src/vfs_path.rs
+++ b/src/tools/rust-analyzer/crates/vfs/src/vfs_path.rs
@@ -39,6 +39,13 @@ impl VfsPath {
         }
     }
 
+    pub fn into_abs_path(self) -> Option<AbsPathBuf> {
+        match self.0 {
+            VfsPathRepr::PathBuf(it) => Some(it),
+            VfsPathRepr::VirtualPath(_) => None,
+        }
+    }
+
     /// Creates a new `VfsPath` with `path` adjoined to `self`.
     pub fn join(&self, path: &str) -> Option<VfsPath> {
         match &self.0 {
diff --git a/src/tools/rust-analyzer/xtask/src/codegen.rs b/src/tools/rust-analyzer/xtask/src/codegen.rs
index bba7ad73f38..19ca62e8a32 100644
--- a/src/tools/rust-analyzer/xtask/src/codegen.rs
+++ b/src/tools/rust-analyzer/xtask/src/codegen.rs
@@ -24,8 +24,8 @@ impl flags::Codegen {
                 grammar::generate(self.check);
                 assists_doc_tests::generate(self.check);
                 parser_inline_tests::generate(self.check);
-                feature_docs::generate(self.check)
-                // diagnostics_docs::generate(self.check) doesn't generate any tests
+                feature_docs::generate(self.check);
+                diagnostics_docs::generate(self.check);
                 // lints::generate(self.check) Updating clones the rust repo, so don't run it unless
                 // explicitly asked for
             }
diff --git a/src/tools/test-float-parse/Cargo.lock b/src/tools/test-float-parse/Cargo.lock
new file mode 100644
index 00000000000..3f60423fed3
--- /dev/null
+++ b/src/tools/test-float-parse/Cargo.lock
@@ -0,0 +1,75 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "getrandom"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.147"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "test-float-parse"
+version = "0.1.0"
+dependencies = [
+ "rand",
+]
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
diff --git a/src/tools/test-float-parse/Cargo.toml b/src/tools/test-float-parse/Cargo.toml
new file mode 100644
index 00000000000..e407e322f9e
--- /dev/null
+++ b/src/tools/test-float-parse/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "test-float-parse"
+version = "0.1.0"
+edition = "2024"
+publish = false
+
+[dependencies]
+indicatif = { version = "0.17.8", default-features = false }
+num = "0.4.3"
+rand = "0.9.0"
+rand_chacha = "0.9.0"
+rayon = "1"
+
+[lib]
+name = "test_float_parse"
+
+[lints.rust.unexpected_cfgs]
+level = "warn"
+check-cfg = [
+    # Internal features aren't marked known config by default
+    'cfg(target_has_reliable_f16)',
+]
diff --git a/src/tools/test-float-parse/README.md b/src/tools/test-float-parse/README.md
new file mode 100644
index 00000000000..5e2c43d1cad
--- /dev/null
+++ b/src/tools/test-float-parse/README.md
@@ -0,0 +1,55 @@
+# Float Parsing Tests
+
+These are tests designed to test decimal to float conversions (`dec2flt`) used
+by the standard library.
+
+It consists of a collection of test generators that each generate a set of
+patterns intended to test a specific property. In addition, there are exhaustive
+tests (for <= `f32`) and fuzzers (for anything that can't be run exhaustively).
+
+The generators work as follows:
+
+- Each generator is a struct that lives somewhere in the `gen` module. Usually
+  it is generic over a float type.
+- These generators must implement `Iterator`, which should return a context type
+  that can be used to construct a test string (but usually not the string
+  itself).
+- They must also implement the `Generator` trait, which provides a method to
+  write test context to a string as a test case, as well as some extra metadata.
+
+  The split between context generation and string construction is so that we can
+  reuse string allocations.
+- Each generator gets registered once for each float type. Each of these
+  generators then get their iterator called, and each test case checked against
+  the float type's parse implementation.
+
+Some generators produce decimal strings, others create bit patterns that need to
+be bitcasted to the float type, which then uses its `Display` implementation to
+write to a string. For these, float to decimal (`flt2dec`) conversions also get
+tested, if unintentionally.
+
+For each test case, the following is done:
+
+- The test string is parsed to the float type using the standard library's
+  implementation.
+- The test string is parsed separately to a `BigRational`, which acts as a
+  representation with infinite precision.
+- The rational value then gets checked that it is within the float's
+  representable values (absolute value greater than the smallest number to round
+  to zero, but less less than the first value to round to infinity). If these
+  limits are exceeded, check that the parsed float reflects that.
+- For real nonzero numbers, the parsed float is converted into a rational using
+  `significand * 2^exponent`. It is then checked against the actual rational
+  value, and verified to be within half a bit's precision of the parsed value.
+  Also it is checked that ties round to even.
+
+This is all highly parallelized with `rayon`; test generators can run in
+parallel, and their tests get chunked and run in parallel.
+
+There is a simple command line that allows filtering which tests are run,
+setting the number of iterations for fuzzing tests, limiting failures, setting
+timeouts, etc. See `main.rs` or run with `--help` for options.
+
+Note that when running via `./x`, only tests that take less than a few minutes
+are run by default. Navigate to the crate (or pass `-C` to Cargo) and run it
+directly to run all tests or pass specific arguments.
diff --git a/src/tools/test-float-parse/src/gen_/exhaustive.rs b/src/tools/test-float-parse/src/gen_/exhaustive.rs
new file mode 100644
index 00000000000..01458fb0b60
--- /dev/null
+++ b/src/tools/test-float-parse/src/gen_/exhaustive.rs
@@ -0,0 +1,42 @@
+use std::fmt::Write;
+use std::ops::RangeInclusive;
+
+use crate::{Float, Generator, Int};
+
+/// Test every possible bit pattern. This is infeasible to run on any float types larger than
+/// `f32` (which takes about an hour).
+pub struct Exhaustive<F: Float> {
+    iter: RangeInclusive<F::Int>,
+}
+
+impl<F: Float> Generator<F> for Exhaustive<F>
+where
+    RangeInclusive<F::Int>: Iterator<Item = F::Int>,
+{
+    const SHORT_NAME: &'static str = "exhaustive";
+
+    type WriteCtx = F;
+
+    fn total_tests() -> u64 {
+        1u64.checked_shl(F::Int::BITS).expect("More than u64::MAX tests")
+    }
+
+    fn new() -> Self {
+        Self { iter: F::Int::ZERO..=F::Int::MAX }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        write!(s, "{ctx:e}").unwrap();
+    }
+}
+
+impl<F: Float> Iterator for Exhaustive<F>
+where
+    RangeInclusive<F::Int>: Iterator<Item = F::Int>,
+{
+    type Item = F;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        Some(F::from_bits(self.iter.next()?))
+    }
+}
diff --git a/src/tools/test-float-parse/src/gen_/exponents.rs b/src/tools/test-float-parse/src/gen_/exponents.rs
new file mode 100644
index 00000000000..3748e9d380c
--- /dev/null
+++ b/src/tools/test-float-parse/src/gen_/exponents.rs
@@ -0,0 +1,95 @@
+use std::fmt::Write;
+use std::ops::RangeInclusive;
+
+use crate::traits::BoxGenIter;
+use crate::{Float, Generator};
+
+const SMALL_COEFF_MAX: i32 = 10_000;
+const SMALL_EXP_MAX: i32 = 300;
+
+const SMALL_COEFF_RANGE: RangeInclusive<i32> = (-SMALL_COEFF_MAX)..=SMALL_COEFF_MAX;
+const SMALL_EXP_RANGE: RangeInclusive<i32> = (-SMALL_EXP_MAX)..=SMALL_EXP_MAX;
+
+const LARGE_COEFF_RANGE: RangeInclusive<u32> = 0..=100_000;
+const LARGE_EXP_RANGE: RangeInclusive<u32> = 300..=350;
+
+/// Check exponential values around zero.
+pub struct SmallExponents<F: Float> {
+    iter: BoxGenIter<Self, F>,
+}
+
+impl<F: Float> Generator<F> for SmallExponents<F> {
+    const NAME: &'static str = "small exponents";
+    const SHORT_NAME: &'static str = "small exp";
+
+    /// `(coefficient, exponent)`
+    type WriteCtx = (i32, i32);
+
+    fn total_tests() -> u64 {
+        ((1 + SMALL_COEFF_RANGE.end() - SMALL_COEFF_RANGE.start())
+            * (1 + SMALL_EXP_RANGE.end() - SMALL_EXP_RANGE.start()))
+        .try_into()
+        .unwrap()
+    }
+
+    fn new() -> Self {
+        let iter = SMALL_EXP_RANGE.flat_map(|exp| SMALL_COEFF_RANGE.map(move |coeff| (coeff, exp)));
+
+        Self { iter: Box::new(iter) }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        let (coeff, exp) = ctx;
+        write!(s, "{coeff}e{exp}").unwrap();
+    }
+}
+
+impl<F: Float> Iterator for SmallExponents<F> {
+    type Item = (i32, i32);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next()
+    }
+}
+
+/// Check exponential values further from zero.
+pub struct LargeExponents<F: Float> {
+    iter: BoxGenIter<Self, F>,
+}
+
+impl<F: Float> Generator<F> for LargeExponents<F> {
+    const NAME: &'static str = "large positive exponents";
+    const SHORT_NAME: &'static str = "large exp";
+
+    /// `(coefficient, exponent, is_positive)`
+    type WriteCtx = (u32, u32, bool);
+
+    fn total_tests() -> u64 {
+        ((1 + LARGE_EXP_RANGE.end() - LARGE_EXP_RANGE.start())
+            * (1 + LARGE_COEFF_RANGE.end() - LARGE_COEFF_RANGE.start())
+            * 2)
+        .into()
+    }
+
+    fn new() -> Self {
+        let iter = LARGE_EXP_RANGE
+            .flat_map(|exp| LARGE_COEFF_RANGE.map(move |coeff| (coeff, exp)))
+            .flat_map(|(coeff, exp)| [(coeff, exp, false), (coeff, exp, true)]);
+
+        Self { iter: Box::new(iter) }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        let (coeff, exp, is_positive) = ctx;
+        let sign = if is_positive { "" } else { "-" };
+        write!(s, "{sign}{coeff}e{exp}").unwrap();
+    }
+}
+
+impl<F: Float> Iterator for LargeExponents<F> {
+    type Item = (u32, u32, bool);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next()
+    }
+}
diff --git a/src/tools/test-float-parse/src/gen_/fuzz.rs b/src/tools/test-float-parse/src/gen_/fuzz.rs
new file mode 100644
index 00000000000..1d6c5562a14
--- /dev/null
+++ b/src/tools/test-float-parse/src/gen_/fuzz.rs
@@ -0,0 +1,87 @@
+use std::any::{TypeId, type_name};
+use std::collections::BTreeMap;
+use std::fmt::Write;
+use std::marker::PhantomData;
+use std::ops::Range;
+use std::sync::Mutex;
+
+use rand::Rng;
+use rand::distr::{Distribution, StandardUniform};
+use rand_chacha::ChaCha8Rng;
+use rand_chacha::rand_core::SeedableRng;
+
+use crate::{Float, Generator, Int, SEED};
+
+/// Mapping of float types to the number of iterations that should be run.
+///
+/// We could probably make `Generator::new` take an argument instead of the global state,
+/// but we only load this once so it works.
+static FUZZ_COUNTS: Mutex<BTreeMap<TypeId, u64>> = Mutex::new(BTreeMap::new());
+
+/// Generic fuzzer; just tests deterministic random bit patterns N times.
+pub struct Fuzz<F> {
+    iter: Range<u64>,
+    rng: ChaCha8Rng,
+    /// Allow us to use generics in `Iterator`.
+    marker: PhantomData<F>,
+}
+
+impl<F: Float> Fuzz<F> {
+    /// Register how many iterations the fuzzer should run for a type. Uses some logic by
+    /// default, but if `from_cfg` is `Some`, that will be used instead.
+    pub fn set_iterations(from_cfg: Option<u64>) {
+        let count = if let Some(cfg_count) = from_cfg {
+            cfg_count
+        } else if F::BITS <= crate::MAX_BITS_FOR_EXHAUUSTIVE {
+            // If we run exhaustively, still fuzz but only do half as many bits. The only goal here is
+            // to catch failures from e.g. high bit patterns before exhaustive tests would get to them.
+            (F::Int::MAX >> (F::BITS / 2)).try_into().unwrap()
+        } else {
+            // Eveything bigger gets a fuzz test with as many iterations as `f32` exhaustive.
+            u32::MAX.into()
+        };
+
+        let _ = FUZZ_COUNTS.lock().unwrap().insert(TypeId::of::<F>(), count);
+    }
+}
+
+impl<F: Float> Generator<F> for Fuzz<F>
+where
+    StandardUniform: Distribution<<F as Float>::Int>,
+{
+    const SHORT_NAME: &'static str = "fuzz";
+
+    type WriteCtx = F;
+
+    fn total_tests() -> u64 {
+        *FUZZ_COUNTS
+            .lock()
+            .unwrap()
+            .get(&TypeId::of::<F>())
+            .unwrap_or_else(|| panic!("missing fuzz count for {}", type_name::<F>()))
+    }
+
+    fn new() -> Self {
+        let rng = ChaCha8Rng::from_seed(SEED);
+
+        Self { iter: 0..Self::total_tests(), rng, marker: PhantomData }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        write!(s, "{ctx:e}").unwrap();
+    }
+}
+
+impl<F: Float> Iterator for Fuzz<F>
+where
+    StandardUniform: Distribution<<F as Float>::Int>,
+{
+    type Item = <Self as Generator<F>>::WriteCtx;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let _ = self.iter.next()?;
+        let i: F::Int = self.rng.random();
+
+        Some(F::from_bits(i))
+    }
+}
diff --git a/src/tools/test-float-parse/src/gen_/integers.rs b/src/tools/test-float-parse/src/gen_/integers.rs
new file mode 100644
index 00000000000..070d188e88c
--- /dev/null
+++ b/src/tools/test-float-parse/src/gen_/integers.rs
@@ -0,0 +1,104 @@
+use std::fmt::Write;
+use std::ops::{Range, RangeInclusive};
+
+use crate::traits::BoxGenIter;
+use crate::{Float, Generator};
+
+const SMALL_MAX_POW2: u32 = 19;
+
+/// All values up to the max power of two
+const SMALL_VALUES: RangeInclusive<i32> = {
+    let max = 1i32 << SMALL_MAX_POW2;
+    (-max)..=max
+};
+
+/// Large values only get tested around powers of two
+const LARGE_POWERS: Range<u32> = SMALL_MAX_POW2..128;
+
+/// We perturbe each large value around these ranges
+const LARGE_PERTURBATIONS: RangeInclusive<i128> = -256..=256;
+
+/// Test all integers up to `2 ^ MAX_POW2`
+pub struct SmallInt {
+    iter: RangeInclusive<i32>,
+}
+
+impl<F: Float> Generator<F> for SmallInt {
+    const NAME: &'static str = "small integer values";
+    const SHORT_NAME: &'static str = "int small";
+
+    type WriteCtx = i32;
+
+    fn total_tests() -> u64 {
+        (SMALL_VALUES.end() + 1 - SMALL_VALUES.start()).try_into().unwrap()
+    }
+
+    fn new() -> Self {
+        Self { iter: SMALL_VALUES }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        write!(s, "{ctx}").unwrap();
+    }
+}
+
+impl Iterator for SmallInt {
+    type Item = i32;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next()
+    }
+}
+
+/// Test much bigger integers than [`SmallInt`].
+pub struct LargeInt<F: Float> {
+    iter: BoxGenIter<Self, F>,
+}
+
+impl<F: Float> LargeInt<F> {
+    const EDGE_CASES: [i128; 7] = [
+        i32::MIN as i128,
+        i32::MAX as i128,
+        i64::MIN as i128,
+        i64::MAX as i128,
+        u64::MAX as i128,
+        i128::MIN,
+        i128::MAX,
+    ];
+}
+
+impl<F: Float> Generator<F> for LargeInt<F> {
+    const NAME: &'static str = "large integer values";
+    const SHORT_NAME: &'static str = "int large";
+
+    type WriteCtx = i128;
+
+    fn total_tests() -> u64 {
+        u64::try_from(
+            (i128::from(LARGE_POWERS.end - LARGE_POWERS.start)
+                + i128::try_from(Self::EDGE_CASES.len()).unwrap())
+                * (LARGE_PERTURBATIONS.end() + 1 - LARGE_PERTURBATIONS.start()),
+        )
+        .unwrap()
+    }
+
+    fn new() -> Self {
+        let iter = LARGE_POWERS
+            .map(|pow| 1i128 << pow)
+            .chain(Self::EDGE_CASES)
+            .flat_map(|base| LARGE_PERTURBATIONS.map(move |perturb| base.saturating_add(perturb)));
+
+        Self { iter: Box::new(iter) }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        write!(s, "{ctx}").unwrap();
+    }
+}
+impl<F: Float> Iterator for LargeInt<F> {
+    type Item = i128;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next()
+    }
+}
diff --git a/src/tools/test-float-parse/src/gen_/long_fractions.rs b/src/tools/test-float-parse/src/gen_/long_fractions.rs
new file mode 100644
index 00000000000..b75148b779c
--- /dev/null
+++ b/src/tools/test-float-parse/src/gen_/long_fractions.rs
@@ -0,0 +1,58 @@
+use std::char;
+use std::fmt::Write;
+
+use crate::{Float, Generator};
+
+/// Number of decimal digits to check (all of them).
+const MAX_DIGIT: u32 = 9;
+/// Test with this many decimals in the string.
+const MAX_DECIMALS: usize = 410;
+const PREFIX: &str = "0.";
+
+/// Test e.g. `0.1`, `0.11`, `0.111`, `0.1111`, ..., `0.2`, `0.22`, ...
+pub struct RepeatingDecimal {
+    digit: u32,
+    buf: String,
+}
+
+impl<F: Float> Generator<F> for RepeatingDecimal {
+    const NAME: &'static str = "repeating decimal";
+    const SHORT_NAME: &'static str = "dec rep";
+
+    type WriteCtx = String;
+
+    fn total_tests() -> u64 {
+        u64::from(MAX_DIGIT + 1) * u64::try_from(MAX_DECIMALS + 1).unwrap() + 1
+    }
+
+    fn new() -> Self {
+        Self { digit: 0, buf: PREFIX.to_owned() }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        *s = ctx;
+    }
+}
+
+impl Iterator for RepeatingDecimal {
+    type Item = String;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.digit > MAX_DIGIT {
+            return None;
+        }
+
+        let digit = self.digit;
+        let inc_digit = self.buf.len() - PREFIX.len() > MAX_DECIMALS;
+
+        if inc_digit {
+            // Reset the string
+            self.buf.clear();
+            self.digit += 1;
+            self.buf.write_str(PREFIX).unwrap();
+        }
+
+        self.buf.push(char::from_digit(digit, 10).unwrap());
+        Some(self.buf.clone())
+    }
+}
diff --git a/src/tools/test-float-parse/src/gen_/many_digits.rs b/src/tools/test-float-parse/src/gen_/many_digits.rs
new file mode 100644
index 00000000000..741e11437fe
--- /dev/null
+++ b/src/tools/test-float-parse/src/gen_/many_digits.rs
@@ -0,0 +1,84 @@
+use std::char;
+use std::fmt::Write;
+use std::marker::PhantomData;
+use std::ops::{Range, RangeInclusive};
+
+use rand::distr::{Distribution, Uniform};
+use rand::{Rng, SeedableRng};
+use rand_chacha::ChaCha8Rng;
+
+use crate::{Float, Generator, SEED};
+
+/// Total iterations
+const ITERATIONS: u64 = 5_000_000;
+
+/// Possible lengths of the string, excluding decimals and exponents
+const POSSIBLE_NUM_DIGITS: RangeInclusive<usize> = 100..=400;
+
+/// Range of possible exponents
+const EXP_RANGE: Range<i32> = -4500..4500;
+
+/// Try strings of random digits.
+pub struct RandDigits<F> {
+    rng: ChaCha8Rng,
+    iter: Range<u64>,
+    uniform: Uniform<u32>,
+    /// Allow us to use generics in `Iterator`.
+    marker: PhantomData<F>,
+}
+
+impl<F: Float> Generator<F> for RandDigits<F> {
+    const NAME: &'static str = "random digits";
+
+    const SHORT_NAME: &'static str = "rand digits";
+
+    type WriteCtx = String;
+
+    fn total_tests() -> u64 {
+        ITERATIONS
+    }
+
+    fn new() -> Self {
+        let rng = ChaCha8Rng::from_seed(SEED);
+        let range = Uniform::try_from(0..10).unwrap();
+
+        Self { rng, iter: 0..ITERATIONS, uniform: range, marker: PhantomData }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        *s = ctx;
+    }
+}
+
+impl<F: Float> Iterator for RandDigits<F> {
+    type Item = String;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let _ = self.iter.next()?;
+        let num_digits = self.rng.random_range(POSSIBLE_NUM_DIGITS);
+        let has_decimal = self.rng.random_bool(0.2);
+        let has_exp = self.rng.random_bool(0.2);
+
+        let dec_pos = if has_decimal { Some(self.rng.random_range(0..num_digits)) } else { None };
+
+        let mut s = String::with_capacity(num_digits);
+
+        for pos in 0..num_digits {
+            let digit = char::from_digit(self.uniform.sample(&mut self.rng), 10).unwrap();
+            s.push(digit);
+
+            if let Some(dec_pos) = dec_pos {
+                if pos == dec_pos {
+                    s.push('.');
+                }
+            }
+        }
+
+        if has_exp {
+            let exp = self.rng.random_range(EXP_RANGE);
+            write!(s, "e{exp}").unwrap();
+        }
+
+        Some(s)
+    }
+}
diff --git a/src/tools/test-float-parse/src/gen_/sparse.rs b/src/tools/test-float-parse/src/gen_/sparse.rs
new file mode 100644
index 00000000000..72b65d4ce7f
--- /dev/null
+++ b/src/tools/test-float-parse/src/gen_/sparse.rs
@@ -0,0 +1,99 @@
+use std::fmt::Write;
+
+use crate::traits::BoxGenIter;
+use crate::{Float, Generator};
+
+const POWERS_OF_TWO: [u128; 128] = make_powers_of_two();
+
+const fn make_powers_of_two() -> [u128; 128] {
+    let mut ret = [0; 128];
+    let mut i = 0;
+    while i < 128 {
+        ret[i] = 1 << i;
+        i += 1;
+    }
+
+    ret
+}
+
+/// Can't clone this result because of lifetime errors, just use a macro.
+macro_rules! pow_iter {
+    () => {
+        (0..F::BITS).map(|i| F::Int::try_from(POWERS_OF_TWO[i as usize]).unwrap())
+    };
+}
+
+/// Test all numbers that include three 1s in the binary representation as integers.
+pub struct FewOnesInt<F: Float>
+where
+    FewOnesInt<F>: Generator<F>,
+{
+    iter: BoxGenIter<Self, F>,
+}
+
+impl<F: Float> Generator<F> for FewOnesInt<F>
+where
+    <F::Int as TryFrom<u128>>::Error: std::fmt::Debug,
+{
+    const SHORT_NAME: &'static str = "few ones int";
+
+    type WriteCtx = F::Int;
+
+    fn total_tests() -> u64 {
+        u64::from(F::BITS).pow(3)
+    }
+
+    fn new() -> Self {
+        let iter = pow_iter!()
+            .flat_map(move |a| pow_iter!().map(move |b| (a, b)))
+            .flat_map(move |(a, b)| pow_iter!().map(move |c| (a, b, c)))
+            .map(|(a, b, c)| a | b | c);
+
+        Self { iter: Box::new(iter) }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        write!(s, "{ctx}").unwrap();
+    }
+}
+
+impl<F: Float> Iterator for FewOnesInt<F> {
+    type Item = F::Int;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next()
+    }
+}
+
+/// Similar to `FewOnesInt` except test those bit patterns as a float.
+pub struct FewOnesFloat<F: Float>(FewOnesInt<F>);
+
+impl<F: Float> Generator<F> for FewOnesFloat<F>
+where
+    <F::Int as TryFrom<u128>>::Error: std::fmt::Debug,
+{
+    const NAME: &'static str = "few ones float";
+    const SHORT_NAME: &'static str = "few ones float";
+
+    type WriteCtx = F;
+
+    fn total_tests() -> u64 {
+        FewOnesInt::<F>::total_tests()
+    }
+
+    fn new() -> Self {
+        Self(FewOnesInt::new())
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        write!(s, "{ctx:e}").unwrap();
+    }
+}
+
+impl<F: Float> Iterator for FewOnesFloat<F> {
+    type Item = F;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.0.next().map(|i| F::from_bits(i))
+    }
+}
diff --git a/src/tools/test-float-parse/src/gen_/spot_checks.rs b/src/tools/test-float-parse/src/gen_/spot_checks.rs
new file mode 100644
index 00000000000..18691f9d6cf
--- /dev/null
+++ b/src/tools/test-float-parse/src/gen_/spot_checks.rs
@@ -0,0 +1,101 @@
+use std::fmt::Write;
+
+use crate::traits::{Float, Generator};
+
+const SPECIAL: &[&str] = &[
+    "inf", "Inf", "iNf", "INF", "-inf", "-Inf", "-iNf", "-INF", "+inf", "+Inf", "+iNf", "+INF",
+    "nan", "NaN", "NAN", "nAn", "-nan", "-NaN", "-NAN", "-nAn", "+nan", "+NaN", "+NAN", "+nAn",
+    "1", "-1", "+1", "1e1", "-1e1", "+1e1", "1e-1", "-1e-1", "+1e-1", "1e+1", "-1e+1", "+1e+1",
+    "1E1", "-1E1", "+1E1", "1E-1", "-1E-1", "+1E-1", "1E+1", "-1E+1", "+1E+1", "0", "-0", "+0",
+];
+
+/// Check various non-numeric special strings.
+pub struct Special {
+    iter: std::slice::Iter<'static, &'static str>,
+}
+
+impl<F: Float> Generator<F> for Special {
+    const NAME: &'static str = "special values";
+
+    const SHORT_NAME: &'static str = "special";
+
+    type WriteCtx = &'static str;
+
+    fn total_tests() -> u64 {
+        SPECIAL.len().try_into().unwrap()
+    }
+
+    fn new() -> Self {
+        Self { iter: SPECIAL.iter() }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        s.write_str(ctx).unwrap();
+    }
+}
+
+impl Iterator for Special {
+    type Item = &'static str;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().copied()
+    }
+}
+
+/// Strings that we know have failed in the past
+const REGRESSIONS: &[&str] = &[
+    // From <https://github.com/rust-lang/rust/issues/31407>
+    "1234567890123456789012345678901234567890e-340",
+    "2.225073858507201136057409796709131975934819546351645648023426109724822222021076945516529523908135087914149158913039621106870086438694594645527657207407820621743379988141063267329253552286881372149012981122451451889849057222307285255133155755015914397476397983411801999323962548289017107081850690630666655994938275772572015763062690663332647565300009245888316433037779791869612049497390377829704905051080609940730262937128958950003583799967207254304360284078895771796150945516748243471030702609144621572289880258182545180325707018860872113128079512233426288368622321503775666622503982534335974568884423900265498198385487948292206894721689831099698365846814022854243330660339850886445804001034933970427567186443383770486037861622771738545623065874679014086723327636718749999999999999999999999999999999999999e-308",
+    "2.22507385850720113605740979670913197593481954635164564802342610972482222202107694551652952390813508791414915891303962110687008643869459464552765720740782062174337998814106326732925355228688137214901298112245145188984905722230728525513315575501591439747639798341180199932396254828901710708185069063066665599493827577257201576306269066333264756530000924588831643303777979186961204949739037782970490505108060994073026293712895895000358379996720725430436028407889577179615094551674824347103070260914462157228988025818254518032570701886087211312807951223342628836862232150377566662250398253433597456888442390026549819838548794829220689472168983109969836584681402285424333066033985088644580400103493397042756718644338377048603786162277173854562306587467901408672332763671875e-308",
+    "0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000222507385850720138309023271733240406421921598046233183055332741688720443481391819585428315901251102056406733973103581100515243416155346010885601238537771882113077799353200233047961014744258363607192156504694250373420837525080665061665815894872049117996859163964850063590877011830487479978088775374994945158045160505091539985658247081864511353793580499211598108576605199243335211435239014879569960959128889160299264151106346631339366347758651302937176204732563178148566435087212282863764204484681140761391147706280168985324411002416144742161856716615054015428508471675290190316132277889672970737312333408698898317506783884692609277397797285865965494109136909540613646756870239867831529068098461721092462539672851562500000000000000001",
+    "179769313486231580793728971405303415079934132710037826936173778980444968292764750946649017977587207096330286416692887910946555547851940402630657488671505820681908902000708383676273854845817711531764475730270069855571366959622842914819860834936475292719074168444365510704342711559699508093042880177904174497791.9999999999999999999999999999999999999999999999999999999999999999999999",
+    "2.47032822920623272e-324",
+    "6.631236871469758276785396630275967243399099947355303144249971758736286630139265439618068200788048744105960420552601852889715006376325666595539603330361800519107591783233358492337208057849499360899425128640718856616503093444922854759159988160304439909868291973931426625698663157749836252274523485312442358651207051292453083278116143932569727918709786004497872322193856150225415211997283078496319412124640111777216148110752815101775295719811974338451936095907419622417538473679495148632480391435931767981122396703443803335529756003353209830071832230689201383015598792184172909927924176339315507402234836120730914783168400715462440053817592702766213559042115986763819482654128770595766806872783349146967171293949598850675682115696218943412532098591327667236328125E-316",
+    "3.237883913302901289588352412501532174863037669423108059901297049552301970670676565786835742587799557860615776559838283435514391084153169252689190564396459577394618038928365305143463955100356696665629202017331344031730044369360205258345803431471660032699580731300954848363975548690010751530018881758184174569652173110473696022749934638425380623369774736560008997404060967498028389191878963968575439222206416981462690113342524002724385941651051293552601421155333430225237291523843322331326138431477823591142408800030775170625915670728657003151953664260769822494937951845801530895238439819708403389937873241463484205608000027270531106827387907791444918534771598750162812548862768493201518991668028251730299953143924168545708663913273994694463908672332763671875E-319",
+    "6.953355807847677105972805215521891690222119817145950754416205607980030131549636688806115726399441880065386399864028691275539539414652831584795668560082999889551357784961446896042113198284213107935110217162654939802416034676213829409720583759540476786936413816541621287843248433202369209916612249676005573022703244799714622116542188837770376022371172079559125853382801396219552418839469770514904192657627060319372847562301074140442660237844114174497210955449896389180395827191602886654488182452409583981389442783377001505462015745017848754574668342161759496661766020028752888783387074850773192997102997936619876226688096314989645766000479009083731736585750335262099860150896718774401964796827166283225641992040747894382698751809812609536720628966577351093292236328125E-310",
+    "3.339068557571188581835713701280943911923401916998521771655656997328440314559615318168849149074662609099998113009465566426808170378434065722991659642619467706034884424989741080790766778456332168200464651593995817371782125010668346652995912233993254584461125868481633343674905074271064409763090708017856584019776878812425312008812326260363035474811532236853359905334625575404216060622858633280744301892470300555678734689978476870369853549413277156622170245846166991655321535529623870646888786637528995592800436177901746286272273374471701452991433047257863864601424252024791567368195056077320885329384322332391564645264143400798619665040608077549162173963649264049738362290606875883456826586710961041737908872035803481241600376705491726170293986797332763671875E-319",
+    "2.4703282292062327208828439643411068618252990130716238221279284125033775363510437593264991818081799618989828234772285886546332835517796989819938739800539093906315035659515570226392290858392449105184435931802849936536152500319370457678249219365623669863658480757001585769269903706311928279558551332927834338409351978015531246597263579574622766465272827220056374006485499977096599470454020828166226237857393450736339007967761930577506740176324673600968951340535537458516661134223766678604162159680461914467291840300530057530849048765391711386591646239524912623653881879636239373280423891018672348497668235089863388587925628302755995657524455507255189313690836254779186948667994968324049705821028513185451396213837722826145437693412532098591327667236328124999e-324",
+    "2.4703282292062327208828439643411068618252990130716238221279284125033775363510437593264991818081799618989828234772285886546332835517796989819938739800539093906315035659515570226392290858392449105184435931802849936536152500319370457678249219365623669863658480757001585769269903706311928279558551332927834338409351978015531246597263579574622766465272827220056374006485499977096599470454020828166226237857393450736339007967761930577506740176324673600968951340535537458516661134223766678604162159680461914467291840300530057530849048765391711386591646239524912623653881879636239373280423891018672348497668235089863388587925628302755995657524455507255189313690836254779186948667994968324049705821028513185451396213837722826145437693412532098591327667236328125e-324",
+    "2.4703282292062327208828439643411068618252990130716238221279284125033775363510437593264991818081799618989828234772285886546332835517796989819938739800539093906315035659515570226392290858392449105184435931802849936536152500319370457678249219365623669863658480757001585769269903706311928279558551332927834338409351978015531246597263579574622766465272827220056374006485499977096599470454020828166226237857393450736339007967761930577506740176324673600968951340535537458516661134223766678604162159680461914467291840300530057530849048765391711386591646239524912623653881879636239373280423891018672348497668235089863388587925628302755995657524455507255189313690836254779186948667994968324049705821028513185451396213837722826145437693412532098591327667236328125001e-324",
+    "7.4109846876186981626485318930233205854758970392148714663837852375101326090531312779794975454245398856969484704316857659638998506553390969459816219401617281718945106978546710679176872575177347315553307795408549809608457500958111373034747658096871009590975442271004757307809711118935784838675653998783503015228055934046593739791790738723868299395818481660169122019456499931289798411362062484498678713572180352209017023903285791732520220528974020802906854021606612375549983402671300035812486479041385743401875520901590172592547146296175134159774938718574737870961645638908718119841271673056017045493004705269590165763776884908267986972573366521765567941072508764337560846003984904972149117463085539556354188641513168478436313080237596295773983001708984374999e-324",
+    "7.4109846876186981626485318930233205854758970392148714663837852375101326090531312779794975454245398856969484704316857659638998506553390969459816219401617281718945106978546710679176872575177347315553307795408549809608457500958111373034747658096871009590975442271004757307809711118935784838675653998783503015228055934046593739791790738723868299395818481660169122019456499931289798411362062484498678713572180352209017023903285791732520220528974020802906854021606612375549983402671300035812486479041385743401875520901590172592547146296175134159774938718574737870961645638908718119841271673056017045493004705269590165763776884908267986972573366521765567941072508764337560846003984904972149117463085539556354188641513168478436313080237596295773983001708984375e-324",
+    "7.4109846876186981626485318930233205854758970392148714663837852375101326090531312779794975454245398856969484704316857659638998506553390969459816219401617281718945106978546710679176872575177347315553307795408549809608457500958111373034747658096871009590975442271004757307809711118935784838675653998783503015228055934046593739791790738723868299395818481660169122019456499931289798411362062484498678713572180352209017023903285791732520220528974020802906854021606612375549983402671300035812486479041385743401875520901590172592547146296175134159774938718574737870961645638908718119841271673056017045493004705269590165763776884908267986972573366521765567941072508764337560846003984904972149117463085539556354188641513168478436313080237596295773983001708984375001e-324",
+    "94393431193180696942841837085033647913224148539854e-358",
+    "104308485241983990666713401708072175773165034278685682646111762292409330928739751702404658197872319129036519947435319418387839758990478549477777586673075945844895981012024387992135617064532141489278815239849108105951619997829153633535314849999674266169258928940692239684771590065027025835804863585454872499320500023126142553932654370362024104462255244034053203998964360882487378334860197725139151265590832887433736189468858614521708567646743455601905935595381852723723645799866672558576993978025033590728687206296379801363024094048327273913079612469982585674824156000783167963081616214710691759864332339239688734656548790656486646106983450809073750535624894296242072010195710276073042036425579852459556183541199012652571123898996574563824424330960027873516082763671875e-1075",
+    "0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000247032822920623272088284396434110686182529901307162382212792841250337753635104375932649918180817996189898282347722858865463328355177969898199387398005390939063150356595155702263922908583924491051844359318028499365361525003193704576782492193656236698636584807570015857692699037063119282795585513329278343384093519780155312465972635795746227664652728272200563740064854999770965994704540208281662262378573934507363390079677619305775067401763246736009689513405355374585166611342237666786041621596804619144672918403005300575308490487653917113865916462395249126236538818796362393732804238910186723484976682350898633885879256283027559956575244555072551893136908362547791869486679949683240497058210285131854513962138377228261454376934125320985913276672363281249",
+    "0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000247032822920623272088284396434110686182529901307162382212792841250337753635104375932649918180817996189898282347722858865463328355177969898199387398005390939063150356595155702263922908583924491051844359318028499365361525003193704576782492193656236698636584807570015857692699037063119282795585513329278343384093519780155312465972635795746227664652728272200563740064854999770965994704540208281662262378573934507363390079677619305775067401763246736009689513405355374585166611342237666786041621596804619144672918403005300575308490487653917113865916462395249126236538818796362393732804238910186723484976682350898633885879256283027559956575244555072551893136908362547791869486679949683240497058210285131854513962138377228261454376934125320985913276672363281251",
+];
+
+/// Check items that failed in the past.
+pub struct RegressionCheck {
+    iter: std::slice::Iter<'static, &'static str>,
+}
+
+impl<F: Float> Generator<F> for RegressionCheck {
+    const NAME: &'static str = "regression check";
+
+    const SHORT_NAME: &'static str = "regression";
+
+    type WriteCtx = &'static str;
+
+    fn total_tests() -> u64 {
+        REGRESSIONS.len().try_into().unwrap()
+    }
+
+    fn new() -> Self {
+        Self { iter: REGRESSIONS.iter() }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        s.write_str(ctx).unwrap();
+    }
+}
+
+impl Iterator for RegressionCheck {
+    type Item = &'static str;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().copied()
+    }
+}
diff --git a/src/tools/test-float-parse/src/gen_/subnorm.rs b/src/tools/test-float-parse/src/gen_/subnorm.rs
new file mode 100644
index 00000000000..654f324b9b0
--- /dev/null
+++ b/src/tools/test-float-parse/src/gen_/subnorm.rs
@@ -0,0 +1,108 @@
+use std::fmt::Write;
+use std::ops::RangeInclusive;
+
+use crate::{Float, Generator, Int};
+
+/// Spot check some edge cases for subnormals.
+pub struct SubnormEdgeCases<F: Float> {
+    cases: [F::Int; 6],
+    index: usize,
+}
+
+impl<F: Float> SubnormEdgeCases<F> {
+    /// Shorthand
+    const I1: F::Int = F::Int::ONE;
+
+    fn edge_cases() -> [F::Int; 6] {
+        // Comments use an 8-bit mantissa as a demo
+        [
+            // 0b00000001
+            Self::I1,
+            // 0b10000000
+            Self::I1 << (F::MAN_BITS - 1),
+            // 0b00001000
+            Self::I1 << ((F::MAN_BITS / 2) - 1),
+            // 0b00001111
+            Self::I1 << ((F::MAN_BITS / 2) - 1),
+            // 0b00001111
+            Self::I1 << ((F::MAN_BITS / 2) - 1),
+            // 0b11111111
+            F::MAN_MASK,
+        ]
+    }
+}
+
+impl<F: Float> Generator<F> for SubnormEdgeCases<F> {
+    const NAME: &'static str = "subnormal edge cases";
+    const SHORT_NAME: &'static str = "subnorm edge";
+
+    type WriteCtx = F;
+
+    fn new() -> Self {
+        Self { cases: Self::edge_cases(), index: 0 }
+    }
+
+    fn total_tests() -> u64 {
+        Self::edge_cases().len().try_into().unwrap()
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        write!(s, "{ctx:e}").unwrap();
+    }
+}
+
+impl<F: Float> Iterator for SubnormEdgeCases<F> {
+    type Item = F;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let i = self.cases.get(self.index)?;
+        self.index += 1;
+
+        Some(F::from_bits(*i))
+    }
+}
+
+/// Test all subnormals up to `1 << 22`.
+pub struct SubnormComplete<F: Float> {
+    iter: RangeInclusive<F::Int>,
+}
+
+impl<F: Float> Generator<F> for SubnormComplete<F>
+where
+    RangeInclusive<F::Int>: Iterator<Item = F::Int>,
+{
+    const NAME: &'static str = "subnormal";
+    const SHORT_NAME: &'static str = "subnorm ";
+
+    type WriteCtx = F;
+
+    fn total_tests() -> u64 {
+        let iter = Self::new().iter;
+        (F::Int::ONE + *iter.end() - *iter.start()).try_into().unwrap()
+    }
+
+    fn new() -> Self {
+        let upper_lim = if F::MAN_BITS >= 22 {
+            F::Int::ONE << 22
+        } else {
+            (F::Int::ONE << F::MAN_BITS) - F::Int::ONE
+        };
+
+        Self { iter: F::Int::ZERO..=upper_lim }
+    }
+
+    fn write_string(s: &mut String, ctx: Self::WriteCtx) {
+        write!(s, "{ctx:e}").unwrap();
+    }
+}
+
+impl<F: Float> Iterator for SubnormComplete<F>
+where
+    RangeInclusive<F::Int>: Iterator<Item = F::Int>,
+{
+    type Item = F;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        Some(F::from_bits(self.iter.next()?))
+    }
+}
diff --git a/src/tools/test-float-parse/src/lib.rs b/src/tools/test-float-parse/src/lib.rs
new file mode 100644
index 00000000000..f590149523b
--- /dev/null
+++ b/src/tools/test-float-parse/src/lib.rs
@@ -0,0 +1,419 @@
+#![feature(f16)]
+#![feature(cfg_target_has_reliable_f16_f128)]
+#![expect(internal_features)] // reliable_f16_f128
+
+mod traits;
+mod ui;
+mod validate;
+
+use std::any::type_name;
+use std::cmp::min;
+use std::ops::RangeInclusive;
+use std::process::ExitCode;
+use std::sync::OnceLock;
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::{fmt, time};
+
+use rand::distr::{Distribution, StandardUniform};
+use rayon::prelude::*;
+use time::{Duration, Instant};
+use traits::{Float, Generator, Int};
+use validate::CheckError;
+
+/// Test generators.
+mod gen_ {
+    pub mod exhaustive;
+    pub mod exponents;
+    pub mod fuzz;
+    pub mod integers;
+    pub mod long_fractions;
+    pub mod many_digits;
+    pub mod sparse;
+    pub mod spot_checks;
+    pub mod subnorm;
+}
+
+/// How many failures to exit after if unspecified.
+const DEFAULT_MAX_FAILURES: u64 = 20;
+
+/// Register exhaustive tests only for <= 32 bits. No more because it would take years.
+const MAX_BITS_FOR_EXHAUUSTIVE: u32 = 32;
+
+/// If there are more tests than this threshold, the test will be deferred until after all
+/// others run (so as to avoid thread pool starvation). They also can be excluded with
+/// `--skip-huge`.
+const HUGE_TEST_CUTOFF: u64 = 5_000_000;
+
+/// Seed for tests that use a deterministic RNG.
+const SEED: [u8; 32] = *b"3.141592653589793238462643383279";
+
+/// Global configuration.
+#[derive(Debug)]
+pub struct Config {
+    pub timeout: Duration,
+    /// Failures per test
+    pub max_failures: u64,
+    pub disable_max_failures: bool,
+    /// If `None`, the default will be used
+    pub fuzz_count: Option<u64>,
+    pub skip_huge: bool,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            timeout: Duration::from_secs(60 * 60 * 3),
+            max_failures: DEFAULT_MAX_FAILURES,
+            disable_max_failures: false,
+            fuzz_count: None,
+            skip_huge: false,
+        }
+    }
+}
+
+/// Collect, filter, and launch all tests.
+pub fn run(cfg: Config, include: &[String], exclude: &[String]) -> ExitCode {
+    // With default parallelism, the CPU doesn't saturate. We don't need to be nice to
+    // other processes, so do 1.5x to make sure we use all available resources.
+    let threads = std::thread::available_parallelism().map(Into::into).unwrap_or(0) * 3 / 2;
+    rayon::ThreadPoolBuilder::new().num_threads(threads).build_global().unwrap();
+
+    let mut tests = register_tests(&cfg);
+    println!("registered");
+    let initial_tests: Vec<_> = tests.iter().map(|t| t.name.clone()).collect();
+
+    let unmatched: Vec<_> = include
+        .iter()
+        .chain(exclude.iter())
+        .filter(|filt| !tests.iter().any(|t| t.matches(filt)))
+        .collect();
+
+    assert!(
+        unmatched.is_empty(),
+        "filters were provided that have no matching tests: {unmatched:#?}"
+    );
+
+    tests.retain(|test| !exclude.iter().any(|exc| test.matches(exc)));
+
+    if cfg.skip_huge {
+        tests.retain(|test| !test.is_huge_test());
+    }
+
+    if !include.is_empty() {
+        tests.retain(|test| include.iter().any(|inc| test.matches(inc)));
+    }
+
+    for exc in initial_tests.iter().filter(|orig_name| !tests.iter().any(|t| t.name == **orig_name))
+    {
+        println!("Skipping test '{exc}'");
+    }
+
+    println!("Launching all");
+    let elapsed = launch_tests(&mut tests, &cfg);
+    ui::finish_all(&tests, elapsed, &cfg)
+}
+
+/// Enumerate tests to run but don't actually run them.
+pub fn register_tests(cfg: &Config) -> Vec<TestInfo> {
+    let mut tests = Vec::new();
+
+    // Register normal generators for all floats.
+
+    #[cfg(not(bootstrap))]
+    #[cfg(target_has_reliable_f16)]
+    register_float::<f16>(&mut tests, cfg);
+    register_float::<f32>(&mut tests, cfg);
+    register_float::<f64>(&mut tests, cfg);
+
+    tests.sort_unstable_by_key(|t| (t.float_name, t.gen_name));
+    for i in 0..(tests.len() - 1) {
+        if tests[i].gen_name == tests[i + 1].gen_name {
+            panic!("duplicate test name {}", tests[i].gen_name);
+        }
+    }
+
+    tests
+}
+
+/// Register all generators for a single float.
+fn register_float<F: Float>(tests: &mut Vec<TestInfo>, cfg: &Config)
+where
+    RangeInclusive<F::Int>: Iterator<Item = F::Int>,
+    <F::Int as TryFrom<u128>>::Error: std::fmt::Debug,
+    StandardUniform: Distribution<<F as traits::Float>::Int>,
+{
+    if F::BITS <= MAX_BITS_FOR_EXHAUUSTIVE {
+        // Only run exhaustive tests if there is a chance of completion.
+        TestInfo::register::<F, gen_::exhaustive::Exhaustive<F>>(tests);
+    }
+
+    gen_::fuzz::Fuzz::<F>::set_iterations(cfg.fuzz_count);
+
+    TestInfo::register::<F, gen_::exponents::LargeExponents<F>>(tests);
+    TestInfo::register::<F, gen_::exponents::SmallExponents<F>>(tests);
+    TestInfo::register::<F, gen_::fuzz::Fuzz<F>>(tests);
+    TestInfo::register::<F, gen_::integers::LargeInt<F>>(tests);
+    TestInfo::register::<F, gen_::integers::SmallInt>(tests);
+    TestInfo::register::<F, gen_::long_fractions::RepeatingDecimal>(tests);
+    TestInfo::register::<F, gen_::many_digits::RandDigits<F>>(tests);
+    TestInfo::register::<F, gen_::sparse::FewOnesFloat<F>>(tests);
+    TestInfo::register::<F, gen_::sparse::FewOnesInt<F>>(tests);
+    TestInfo::register::<F, gen_::spot_checks::RegressionCheck>(tests);
+    TestInfo::register::<F, gen_::spot_checks::Special>(tests);
+    TestInfo::register::<F, gen_::subnorm::SubnormComplete<F>>(tests);
+    TestInfo::register::<F, gen_::subnorm::SubnormEdgeCases<F>>(tests);
+}
+
+/// Configuration for a single test.
+#[derive(Debug)]
+pub struct TestInfo {
+    pub name: String,
+    float_name: &'static str,
+    float_bits: u32,
+    gen_name: &'static str,
+    /// Name for display in the progress bar.
+    short_name: String,
+    /// Pad the short name to a common width for progress bar use.
+    short_name_padded: String,
+    total_tests: u64,
+    /// Function to launch this test.
+    launch: fn(&TestInfo, &Config),
+    /// Progress bar to be updated.
+    progress: Option<ui::Progress>,
+    /// Once completed, this will be set.
+    completed: OnceLock<Completed>,
+}
+
+impl TestInfo {
+    /// Check if either the name or short name is a match, for filtering.
+    fn matches(&self, pat: &str) -> bool {
+        self.short_name.contains(pat) || self.name.contains(pat)
+    }
+
+    /// Create a `TestInfo` for a given float and generator, then add it to a list.
+    fn register<F: Float, G: Generator<F>>(v: &mut Vec<Self>) {
+        let f_name = type_name::<F>();
+        let gen_name = G::NAME;
+        let gen_short_name = G::SHORT_NAME;
+        let name = format!("{f_name} {gen_name}");
+        let short_name = format!("{f_name} {gen_short_name}");
+        let short_name_padded = format!("{short_name:18}");
+
+        let info = TestInfo {
+            float_name: f_name,
+            float_bits: F::BITS,
+            gen_name,
+            progress: None,
+            name,
+            short_name_padded,
+            short_name,
+            launch: test_runner::<F, G>,
+            total_tests: G::total_tests(),
+            completed: OnceLock::new(),
+        };
+        v.push(info);
+    }
+
+    /// True if this should be run after all others.
+    fn is_huge_test(&self) -> bool {
+        self.total_tests >= HUGE_TEST_CUTOFF
+    }
+
+    /// When the test is finished, update progress bar messages and finalize.
+    fn complete(&self, c: Completed) {
+        self.progress.as_ref().unwrap().complete(&c, 0);
+        self.completed.set(c).unwrap();
+    }
+}
+
+/// Result of an input did not parsing successfully.
+#[derive(Clone, Debug)]
+enum CheckFailure {
+    /// Above the zero cutoff but got rounded to zero.
+    UnexpectedZero,
+    /// Below the infinity cutoff but got rounded to infinity.
+    UnexpectedInf,
+    /// Above the negative infinity cutoff but got rounded to negative infinity.
+    UnexpectedNegInf,
+    /// Got a `NaN` when none was expected.
+    UnexpectedNan,
+    /// Expected `NaN`, got none.
+    ExpectedNan,
+    /// Expected infinity, got finite.
+    ExpectedInf,
+    /// Expected negative infinity, got finite.
+    ExpectedNegInf,
+    /// The value exceeded its error tolerance.
+    InvalidReal {
+        /// Error from the expected value, as a float.
+        error_float: Option<f64>,
+        /// Error as a rational string (since it can't always be represented as a float).
+        error_str: Box<str>,
+        /// True if the error was caused by not rounding to even at the midpoint between
+        /// two representable values.
+        incorrect_midpoint_rounding: bool,
+    },
+    /// String did not parse successfully.
+    ParsingFailed(Box<str>),
+    /// A panic was caught.
+    Panic(Box<str>),
+}
+
+impl fmt::Display for CheckFailure {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            CheckFailure::UnexpectedZero => {
+                write!(f, "incorrectly rounded to 0 (expected nonzero)")
+            }
+            CheckFailure::UnexpectedInf => {
+                write!(f, "incorrectly rounded to +inf (expected finite)")
+            }
+            CheckFailure::UnexpectedNegInf => {
+                write!(f, "incorrectly rounded to -inf (expected finite)")
+            }
+            CheckFailure::UnexpectedNan => write!(f, "got a NaN where none was expected"),
+            CheckFailure::ExpectedNan => write!(f, "expected a NaN but did not get it"),
+            CheckFailure::ExpectedInf => write!(f, "expected +inf but did not get it"),
+            CheckFailure::ExpectedNegInf => write!(f, "expected -inf but did not get it"),
+            CheckFailure::InvalidReal { error_float, error_str, incorrect_midpoint_rounding } => {
+                if *incorrect_midpoint_rounding {
+                    write!(
+                        f,
+                        "midpoint between two representable values did not correctly \
+                        round to even; error: {error_str}"
+                    )?;
+                } else {
+                    write!(f, "real number did not parse correctly; error: {error_str}")?;
+                }
+
+                if let Some(float) = error_float {
+                    write!(f, " ({float})")?;
+                }
+                Ok(())
+            }
+            CheckFailure::ParsingFailed(e) => write!(f, "parsing failed: {e}"),
+            CheckFailure::Panic(e) => write!(f, "function panicked: {e}"),
+        }
+    }
+}
+
+/// Information about a completed test generator.
+#[derive(Clone, Debug)]
+struct Completed {
+    /// Finished tests (both successful and failed).
+    executed: u64,
+    /// Failed tests.
+    failures: u64,
+    /// Extra exit information if unsuccessful.
+    result: Result<FinishedAll, EarlyExit>,
+    /// If there is something to warn about (e.g bad estimate), leave it here.
+    warning: Option<Box<str>>,
+    /// Total time to run the test.
+    elapsed: Duration,
+}
+
+/// Marker for completing all tests (used in `Result` types).
+#[derive(Clone, Debug)]
+struct FinishedAll;
+
+/// Reasons for exiting early.
+#[derive(Clone, Debug)]
+enum EarlyExit {
+    Timeout,
+    MaxFailures,
+}
+
+/// Run all tests in `tests`.
+///
+/// This launches a main thread that receives messages and handlees UI updates, and uses the
+/// rest of the thread pool to execute the tests.
+fn launch_tests(tests: &mut [TestInfo], cfg: &Config) -> Duration {
+    // Run shorter tests and smaller float types first.
+    tests.sort_unstable_by_key(|test| (test.total_tests, test.float_bits));
+
+    for test in tests.iter() {
+        println!("Launching test '{}'", test.name);
+    }
+
+    let mut all_progress_bars = Vec::new();
+    let start = Instant::now();
+
+    for test in tests.iter_mut() {
+        test.progress = Some(ui::Progress::new(test, &mut all_progress_bars));
+        ui::set_panic_hook(&all_progress_bars);
+        ((test.launch)(test, cfg));
+    }
+
+    start.elapsed()
+}
+
+/// Test runer for a single generator.
+///
+/// This calls the generator's iterator multiple times (in parallel) and validates each output.
+fn test_runner<F: Float, G: Generator<F>>(test: &TestInfo, cfg: &Config) {
+    let gen_ = G::new();
+    let executed = AtomicU64::new(0);
+    let failures = AtomicU64::new(0);
+
+    let checks_per_update = min(test.total_tests, 1000);
+    let started = Instant::now();
+
+    // Function to execute for a single test iteration.
+    let check_one = |buf: &mut String, ctx: G::WriteCtx| {
+        let executed = executed.fetch_add(1, Ordering::Relaxed);
+        buf.clear();
+        G::write_string(buf, ctx);
+
+        match validate::validate::<F>(buf) {
+            Ok(()) => (),
+            Err(e) => {
+                let CheckError { fail, input, float_res } = e;
+                test.progress.as_ref().unwrap().println(&format!(
+                    "Failure in '{}': {fail}. parsing '{input}'. Parsed as: {float_res}",
+                    test.name
+                ));
+
+                let f = failures.fetch_add(1, Ordering::Relaxed);
+                // End early if the limit is exceeded.
+                if f >= cfg.max_failures {
+                    return Err(EarlyExit::MaxFailures);
+                }
+            }
+        };
+
+        // Send periodic updates
+        if executed % checks_per_update == 0 {
+            let failures = failures.load(Ordering::Relaxed);
+            test.progress.as_ref().unwrap().update(executed, failures);
+            if started.elapsed() > cfg.timeout {
+                return Err(EarlyExit::Timeout);
+            }
+        }
+
+        Ok(())
+    };
+
+    // Run the test iterations in parallel. Each thread gets a string buffer to write
+    // its check values to.
+    let res = gen_.par_bridge().try_for_each_init(String::new, check_one);
+
+    let elapsed = started.elapsed();
+    let executed = executed.into_inner();
+    let failures = failures.into_inner();
+
+    // Warn about bad estimates if relevant.
+    let warning = if executed != test.total_tests && res.is_ok() {
+        let msg = format!(
+            "executed tests != estimated ({executed} != {}) for {}",
+            test.total_tests,
+            G::NAME
+        );
+
+        Some(msg.into())
+    } else {
+        None
+    };
+
+    let result = res.map(|()| FinishedAll);
+    test.complete(Completed { executed, failures, result, warning, elapsed });
+}
diff --git a/src/tools/test-float-parse/src/main.rs b/src/tools/test-float-parse/src/main.rs
new file mode 100644
index 00000000000..9c6cad7324f
--- /dev/null
+++ b/src/tools/test-float-parse/src/main.rs
@@ -0,0 +1,129 @@
+use std::process::ExitCode;
+use std::time::Duration;
+
+use test_float_parse as tfp;
+
+static HELP: &str = r#"Usage:
+
+  ./test-float-parse [--timeout x] [--exclude x] [--max-failures x] [INCLUDE ...]
+  ./test-float-parse [--fuzz-count x] [INCLUDE ...]
+  ./test-float-parse [--skip-huge] [INCLUDE ...]
+  ./test-float-parse --list
+
+Args:
+
+  INCLUDE                  Include only tests with names containing these
+                           strings. If this argument is not specified, all tests
+                           are run.
+  --timeout N              Exit after this amount of time (in seconds).
+  --exclude FILTER         Skip tests containing this string. May be specified
+                           more than once.
+  --list                   List available tests.
+  --max-failures N         Limit to N failures per test. Defaults to 20. Pass
+                           "--max-failures none" to remove this limit.
+  --fuzz-count N           Run the fuzzer with N iterations. Only has an effect
+                           if fuzz tests are enabled. Pass `--fuzz-count none`
+                           to remove this limit.
+  --skip-huge              Skip tests that run for a long time.
+  --all                    Reset previous `--exclude`, `--skip-huge`, and
+                           `INCLUDE` arguments (useful for running all tests
+                           via `./x`).
+"#;
+
+enum ArgMode {
+    Any,
+    Timeout,
+    Exclude,
+    FuzzCount,
+    MaxFailures,
+}
+
+fn main() -> ExitCode {
+    if cfg!(debug_assertions) {
+        println!(
+            "WARNING: running in debug mode. Release mode is recommended to reduce test duration."
+        );
+        std::thread::sleep(Duration::from_secs(2));
+    }
+
+    let args: Vec<_> = std::env::args().skip(1).collect();
+    if args.iter().any(|arg| arg == "--help" || arg == "-h") {
+        println!("{HELP}");
+        return ExitCode::SUCCESS;
+    }
+
+    if args.iter().any(|arg| arg == "--list") {
+        let tests = tfp::register_tests(&tfp::Config::default());
+        println!("Available tests:");
+        for t in tests {
+            println!("{}", t.name);
+        }
+
+        return ExitCode::SUCCESS;
+    }
+
+    let (cfg, include, exclude) = parse_args(args);
+
+    tfp::run(cfg, &include, &exclude)
+}
+
+/// Simple command argument parser
+fn parse_args(args: Vec<String>) -> (tfp::Config, Vec<String>, Vec<String>) {
+    let mut cfg = tfp::Config::default();
+
+    let mut mode = ArgMode::Any;
+    let mut include = Vec::new();
+    let mut exclude = Vec::new();
+
+    for arg in args {
+        mode = match mode {
+            ArgMode::Any if arg == "--timeout" => ArgMode::Timeout,
+            ArgMode::Any if arg == "--exclude" => ArgMode::Exclude,
+            ArgMode::Any if arg == "--max-failures" => ArgMode::MaxFailures,
+            ArgMode::Any if arg == "--fuzz-count" => ArgMode::FuzzCount,
+            ArgMode::Any if arg == "--skip-huge" => {
+                cfg.skip_huge = true;
+                ArgMode::Any
+            }
+            ArgMode::Any if arg == "--all" => {
+                cfg.skip_huge = false;
+                include.clear();
+                exclude.clear();
+                ArgMode::Any
+            }
+            ArgMode::Any if arg.starts_with('-') => {
+                panic!("Unknown argument {arg}. Usage:\n{HELP}")
+            }
+            ArgMode::Any => {
+                include.push(arg);
+                ArgMode::Any
+            }
+            ArgMode::Timeout => {
+                cfg.timeout = Duration::from_secs(arg.parse().unwrap());
+                ArgMode::Any
+            }
+            ArgMode::MaxFailures => {
+                if arg == "none" {
+                    cfg.disable_max_failures = true;
+                } else {
+                    cfg.max_failures = arg.parse().unwrap();
+                }
+                ArgMode::Any
+            }
+            ArgMode::FuzzCount => {
+                if arg == "none" {
+                    cfg.fuzz_count = Some(u64::MAX);
+                } else {
+                    cfg.fuzz_count = Some(arg.parse().unwrap());
+                }
+                ArgMode::Any
+            }
+            ArgMode::Exclude => {
+                exclude.push(arg);
+                ArgMode::Any
+            }
+        }
+    }
+
+    (cfg, include, exclude)
+}
diff --git a/src/tools/test-float-parse/src/traits.rs b/src/tools/test-float-parse/src/traits.rs
new file mode 100644
index 00000000000..16484f8fe2c
--- /dev/null
+++ b/src/tools/test-float-parse/src/traits.rs
@@ -0,0 +1,206 @@
+//! Interfaces used throughout this crate.
+
+use std::str::FromStr;
+use std::{fmt, ops};
+
+use num::Integer;
+use num::bigint::ToBigInt;
+
+use crate::validate::Constants;
+
+/// Integer types.
+#[allow(dead_code)] // Some functions only used for testing
+pub trait Int:
+    Clone
+    + Copy
+    + fmt::Debug
+    + fmt::Display
+    + fmt::LowerHex
+    + ops::Add<Output = Self>
+    + ops::Sub<Output = Self>
+    + ops::Shl<u32, Output = Self>
+    + ops::Shr<u32, Output = Self>
+    + ops::BitAnd<Output = Self>
+    + ops::BitOr<Output = Self>
+    + ops::Not<Output = Self>
+    + ops::AddAssign
+    + ops::BitAndAssign
+    + ops::BitOrAssign
+    + From<u8>
+    + TryFrom<i8>
+    + TryFrom<u32, Error: fmt::Debug>
+    + TryFrom<u64, Error: fmt::Debug>
+    + TryFrom<u128, Error: fmt::Debug>
+    + TryInto<u64, Error: fmt::Debug>
+    + TryInto<u32, Error: fmt::Debug>
+    + ToBigInt
+    + PartialOrd
+    + Integer
+    + Send
+    + 'static
+{
+    type Signed: Int;
+    type Bytes: Default + AsMut<[u8]>;
+
+    const BITS: u32;
+    const ZERO: Self;
+    const ONE: Self;
+    const MAX: Self;
+
+    fn to_signed(self) -> Self::Signed;
+    fn wrapping_neg(self) -> Self;
+    fn trailing_zeros(self) -> u32;
+
+    fn hex(self) -> String {
+        format!("{self:x}")
+    }
+}
+
+macro_rules! impl_int {
+    ($($uty:ty, $sty:ty);+) => {
+        $(
+            impl Int for $uty {
+                type Signed = $sty;
+                type Bytes = [u8; Self::BITS as usize / 8];
+                const BITS: u32 = Self::BITS;
+                const ZERO: Self = 0;
+                const ONE: Self = 1;
+                const MAX: Self = Self::MAX;
+                fn to_signed(self) -> Self::Signed {
+                    self.try_into().unwrap()
+                }
+                fn wrapping_neg(self) -> Self {
+                    self.wrapping_neg()
+                }
+                fn trailing_zeros(self) -> u32 {
+                    self.trailing_zeros()
+                }
+            }
+
+            impl Int for $sty {
+                type Signed = Self;
+                type Bytes = [u8; Self::BITS as usize / 8];
+                const BITS: u32 = Self::BITS;
+                const ZERO: Self = 0;
+                const ONE: Self = 1;
+                const MAX: Self = Self::MAX;
+                fn to_signed(self) -> Self::Signed {
+                    self
+                }
+                fn wrapping_neg(self) -> Self {
+                    self.wrapping_neg()
+                }
+                fn trailing_zeros(self) -> u32 {
+                    self.trailing_zeros()
+                }
+            }
+        )+
+    }
+}
+
+impl_int!(u16, i16; u32, i32; u64, i64);
+
+/// Floating point types.
+pub trait Float:
+    Copy + fmt::Debug + fmt::LowerExp + FromStr<Err: fmt::Display> + Sized + Send + 'static
+{
+    /// Unsigned integer of same width
+    type Int: Int<Signed = Self::SInt>;
+    type SInt: Int;
+
+    /// Total bits
+    const BITS: u32;
+
+    /// (Stored) bits in the mantissa)
+    const MAN_BITS: u32;
+
+    /// Bits in the exponent
+    const EXP_BITS: u32 = Self::BITS - Self::MAN_BITS - 1;
+
+    /// A saturated exponent (all ones)
+    const EXP_SAT: u32 = (1 << Self::EXP_BITS) - 1;
+
+    /// The exponent bias, also its maximum value
+    const EXP_BIAS: u32 = Self::EXP_SAT >> 1;
+
+    const MAN_MASK: Self::Int;
+    const SIGN_MASK: Self::Int;
+
+    fn from_bits(i: Self::Int) -> Self;
+    fn to_bits(self) -> Self::Int;
+
+    /// Rational constants associated with this float type.
+    fn constants() -> &'static Constants;
+
+    fn is_sign_negative(self) -> bool {
+        (self.to_bits() & Self::SIGN_MASK) > Self::Int::ZERO
+    }
+
+    /// Exponent without adjustment for bias.
+    fn exponent(self) -> u32 {
+        ((self.to_bits() >> Self::MAN_BITS) & Self::EXP_SAT.try_into().unwrap()).try_into().unwrap()
+    }
+
+    fn mantissa(self) -> Self::Int {
+        self.to_bits() & Self::MAN_MASK
+    }
+}
+
+macro_rules! impl_float {
+    ($($fty:ty, $ity:ty);+) => {
+        $(
+            impl Float for $fty {
+                type Int = $ity;
+                type SInt = <Self::Int as Int>::Signed;
+                const BITS: u32 = <$ity>::BITS;
+                const MAN_BITS: u32 = Self::MANTISSA_DIGITS - 1;
+                const MAN_MASK: Self::Int = (Self::Int::ONE << Self::MAN_BITS) - Self::Int::ONE;
+                const SIGN_MASK: Self::Int = Self::Int::ONE << (Self::BITS-1);
+                fn from_bits(i: Self::Int) -> Self { Self::from_bits(i) }
+                fn to_bits(self) -> Self::Int { self.to_bits() }
+                fn constants() -> &'static Constants {
+                    use std::sync::LazyLock;
+                    static CONSTANTS: LazyLock<Constants> = LazyLock::new(Constants::new::<$fty>);
+                    &CONSTANTS
+                }
+            }
+        )+
+    }
+}
+
+impl_float!(f32, u32; f64, u64);
+
+#[cfg(not(bootstrap))]
+#[cfg(target_has_reliable_f16)]
+impl_float!(f16, u16);
+
+/// A test generator. Should provide an iterator that produces unique patterns to parse.
+///
+/// The iterator needs to provide a `WriteCtx` (could be anything), which is then used to
+/// write the string at a later step. This is done separately so that we can reuse string
+/// allocations (which otherwise turn out to be a pretty expensive part of these tests).
+pub trait Generator<F: Float>: Iterator<Item = Self::WriteCtx> + Send + 'static {
+    /// Full display and filtering name
+    const NAME: &'static str = Self::SHORT_NAME;
+
+    /// Name for display with the progress bar
+    const SHORT_NAME: &'static str;
+
+    /// The context needed to create a test string.
+    type WriteCtx: Send;
+
+    /// Number of tests that will be run.
+    fn total_tests() -> u64;
+
+    /// Constructor for this test generator.
+    fn new() -> Self;
+
+    /// Create a test string given write context, which was produced as a step from the iterator.
+    ///
+    /// `s` will be provided empty.
+    fn write_string(s: &mut String, ctx: Self::WriteCtx);
+}
+
+/// For tests that use iterator combinators, it is easier to just to box the iterator than trying
+/// to specify its type. This is a shorthand for the usual type.
+pub type BoxGenIter<This, F> = Box<dyn Iterator<Item = <This as Generator<F>>::WriteCtx> + Send>;
diff --git a/src/tools/test-float-parse/src/ui.rs b/src/tools/test-float-parse/src/ui.rs
new file mode 100644
index 00000000000..73473eef0bf
--- /dev/null
+++ b/src/tools/test-float-parse/src/ui.rs
@@ -0,0 +1,168 @@
+//! Progress bars and such.
+
+use std::any::type_name;
+use std::fmt;
+use std::io::{self, Write};
+use std::process::ExitCode;
+use std::time::Duration;
+
+use indicatif::{ProgressBar, ProgressStyle};
+
+use crate::{Completed, Config, EarlyExit, FinishedAll, TestInfo};
+
+/// Templates for progress bars.
+const PB_TEMPLATE: &str = "[{elapsed:3} {percent:3}%] {bar:20.cyan/blue} NAME \
+        {human_pos:>8}/{human_len:8} {msg} f {per_sec:14} eta {eta:8}";
+const PB_TEMPLATE_FINAL: &str = "[{elapsed:3} {percent:3}%] {bar:20.cyan/blue} NAME \
+        {human_pos:>8}/{human_len:8} {msg:.COLOR} {per_sec:18} {elapsed_precise}";
+
+/// Thin abstraction over our usage of a `ProgressBar`.
+#[derive(Debug)]
+pub struct Progress {
+    pb: ProgressBar,
+    make_final_style: NoDebug<Box<dyn Fn(&'static str) -> ProgressStyle + Sync>>,
+}
+
+impl Progress {
+    /// Create a new progress bar within a multiprogress bar.
+    pub fn new(test: &TestInfo, all_bars: &mut Vec<ProgressBar>) -> Self {
+        let initial_template = PB_TEMPLATE.replace("NAME", &test.short_name_padded);
+        let final_template = PB_TEMPLATE_FINAL.replace("NAME", &test.short_name_padded);
+        let initial_style =
+            ProgressStyle::with_template(&initial_template).unwrap().progress_chars("##-");
+        let make_final_style = move |color| {
+            ProgressStyle::with_template(&final_template.replace("COLOR", color))
+                .unwrap()
+                .progress_chars("##-")
+        };
+
+        let pb = ProgressBar::new(test.total_tests);
+        pb.set_style(initial_style);
+        pb.set_length(test.total_tests);
+        pb.set_message("0");
+        all_bars.push(pb.clone());
+
+        Progress { pb, make_final_style: NoDebug(Box::new(make_final_style)) }
+    }
+
+    /// Completed a out of b tests.
+    pub fn update(&self, completed: u64, failures: u64) {
+        // Infrequently update the progress bar.
+        if completed % 5_000 == 0 || failures > 0 {
+            self.pb.set_position(completed);
+        }
+
+        if failures > 0 {
+            self.pb.set_message(format! {"{failures}"});
+        }
+    }
+
+    /// Finalize the progress bar.
+    pub fn complete(&self, c: &Completed, real_total: u64) {
+        let f = c.failures;
+        let (color, msg, finish_fn): (&str, String, fn(&ProgressBar)) = match &c.result {
+            Ok(FinishedAll) if f > 0 => {
+                ("red", format!("{f} f (completed with errors)",), ProgressBar::finish)
+            }
+            Ok(FinishedAll) => {
+                ("green", format!("{f} f (completed successfully)",), ProgressBar::finish)
+            }
+            Err(EarlyExit::Timeout) => ("red", format!("{f} f (timed out)"), ProgressBar::abandon),
+            Err(EarlyExit::MaxFailures) => {
+                ("red", format!("{f} f (failure limit)"), ProgressBar::abandon)
+            }
+        };
+
+        self.pb.set_position(real_total);
+        self.pb.set_style(self.make_final_style.0(color));
+        self.pb.set_message(msg);
+        finish_fn(&self.pb);
+    }
+
+    /// Print a message to stdout above the current progress bar.
+    pub fn println(&self, msg: &str) {
+        self.pb.suspend(|| println!("{msg}"));
+    }
+}
+
+/// Print final messages after all tests are complete.
+pub fn finish_all(tests: &[TestInfo], total_elapsed: Duration, cfg: &Config) -> ExitCode {
+    println!("\n\nResults:");
+
+    let mut failed_generators = 0;
+    let mut stopped_generators = 0;
+
+    for t in tests {
+        let Completed { executed, failures, elapsed, warning, result } = t.completed.get().unwrap();
+
+        let stat = if result.is_err() {
+            stopped_generators += 1;
+            "STOPPED"
+        } else if *failures > 0 {
+            failed_generators += 1;
+            "FAILURE"
+        } else {
+            "SUCCESS"
+        };
+
+        println!(
+            "    {stat} for generator '{name}'. {passed}/{executed} passed in {elapsed:?}",
+            name = t.name,
+            passed = executed - failures,
+        );
+
+        if let Some(warning) = warning {
+            println!("      warning: {warning}");
+        }
+
+        match result {
+            Ok(FinishedAll) => (),
+            Err(EarlyExit::Timeout) => {
+                println!("      exited early; exceded {:?} timeout", cfg.timeout)
+            }
+            Err(EarlyExit::MaxFailures) => {
+                println!("      exited early; exceeded {:?} max failures", cfg.max_failures)
+            }
+        }
+    }
+
+    println!(
+        "{passed}/{} tests succeeded in {total_elapsed:?} ({passed} passed, {} failed, {} stopped)",
+        tests.len(),
+        failed_generators,
+        stopped_generators,
+        passed = tests.len() - failed_generators - stopped_generators,
+    );
+
+    if failed_generators > 0 || stopped_generators > 0 {
+        ExitCode::FAILURE
+    } else {
+        ExitCode::SUCCESS
+    }
+}
+
+/// indicatif likes to eat panic messages. This workaround isn't ideal, but it improves things.
+/// <https://github.com/console-rs/indicatif/issues/121>.
+pub fn set_panic_hook(drop_bars: &[ProgressBar]) {
+    let hook = std::panic::take_hook();
+    let drop_bars = drop_bars.to_owned();
+    std::panic::set_hook(Box::new(move |info| {
+        for bar in &drop_bars {
+            bar.abandon();
+            println!();
+            io::stdout().flush().unwrap();
+            io::stderr().flush().unwrap();
+        }
+        hook(info);
+    }));
+}
+
+/// Allow non-Debug items in a `derive(Debug)` struct.
+#[derive(Clone)]
+struct NoDebug<T>(T);
+
+impl<T> fmt::Debug for NoDebug<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(type_name::<Self>())
+    }
+}
diff --git a/src/tools/test-float-parse/src/validate.rs b/src/tools/test-float-parse/src/validate.rs
new file mode 100644
index 00000000000..40dda274e3b
--- /dev/null
+++ b/src/tools/test-float-parse/src/validate.rs
@@ -0,0 +1,394 @@
+//! Everything related to verifying that parsed outputs are correct.
+
+use std::any::{Any, type_name};
+use std::collections::BTreeMap;
+use std::ops::RangeInclusive;
+use std::str::FromStr;
+use std::sync::LazyLock;
+
+use num::bigint::ToBigInt;
+use num::{BigInt, BigRational, FromPrimitive, Signed, ToPrimitive};
+
+use crate::{CheckFailure, Float, Int};
+
+/// Powers of two that we store for constants. Account for binary128 which has a 15-bit exponent.
+const POWERS_OF_TWO_RANGE: RangeInclusive<i32> = (-(2 << 15))..=(2 << 15);
+
+/// Powers of ten that we cache. Account for binary128, which can fit +4932/-4931
+const POWERS_OF_TEN_RANGE: RangeInclusive<i32> = -5_000..=5_000;
+
+/// Cached powers of 10 so we can look them up rather than recreating.
+static POWERS_OF_TEN: LazyLock<BTreeMap<i32, BigRational>> = LazyLock::new(|| {
+    POWERS_OF_TEN_RANGE.map(|exp| (exp, BigRational::from_u32(10).unwrap().pow(exp))).collect()
+});
+
+/// Rational property-related constants for a specific float type.
+#[allow(dead_code)]
+#[derive(Debug)]
+pub struct Constants {
+    /// The minimum positive value (a subnormal).
+    min_subnormal: BigRational,
+    /// The maximum possible finite value.
+    max: BigRational,
+    /// Cutoff between rounding to zero and rounding to the minimum value (min subnormal).
+    zero_cutoff: BigRational,
+    /// Cutoff between rounding to the max value and rounding to infinity.
+    inf_cutoff: BigRational,
+    /// Opposite of `inf_cutoff`
+    neg_inf_cutoff: BigRational,
+    /// The powers of two for all relevant integers.
+    powers_of_two: BTreeMap<i32, BigRational>,
+    /// Half of each power of two. ULP = "unit in last position".
+    ///
+    /// This is a mapping from integers to half the precision available at that exponent. In other
+    /// words, `0.5 * 2^n` = `2^(n-1)`, which is half the distance between `m * 2^n` and
+    /// `(m + 1) * 2^n`, m ∈ ℤ.
+    ///
+    /// So, this is the maximum error from a real number to its floating point representation,
+    /// assuming the float type can represent the exponent.
+    half_ulp: BTreeMap<i32, BigRational>,
+    /// Handy to have around so we don't need to reallocate for it
+    two: BigInt,
+}
+
+impl Constants {
+    pub fn new<F: Float>() -> Self {
+        let two_int = &BigInt::from_u32(2).unwrap();
+        let two = &BigRational::from_integer(2.into());
+
+        // The minimum subnormal (aka minimum positive) value. Most negative power of two is the
+        // minimum exponent (bias - 1) plus the extra from shifting within the mantissa bits.
+        let min_subnormal = two.pow(-(F::EXP_BIAS + F::MAN_BITS - 1).to_signed());
+
+        // The maximum value is the maximum exponent with a fully saturated mantissa. This
+        // is easiest to calculate by evaluating what the next value up would be if representable
+        // (zeroed mantissa, exponent increments by one, i.e. `2^(bias + 1)`), and subtracting
+        // a single LSB (`2 ^ (-mantissa_bits)`).
+        let max = (two - two.pow(-F::MAN_BITS.to_signed())) * (two.pow(F::EXP_BIAS.to_signed()));
+        let zero_cutoff = &min_subnormal / two_int;
+
+        let inf_cutoff = &max + two_int.pow(F::EXP_BIAS - F::MAN_BITS - 1);
+        let neg_inf_cutoff = -&inf_cutoff;
+
+        let powers_of_two: BTreeMap<i32, _> =
+            (POWERS_OF_TWO_RANGE).map(|n| (n, two.pow(n))).collect();
+        let mut half_ulp = powers_of_two.clone();
+        half_ulp.iter_mut().for_each(|(_k, v)| *v = &*v / two_int);
+
+        Self {
+            min_subnormal,
+            max,
+            zero_cutoff,
+            inf_cutoff,
+            neg_inf_cutoff,
+            powers_of_two,
+            half_ulp,
+            two: two_int.clone(),
+        }
+    }
+}
+
+/// Validate that a string parses correctly
+pub fn validate<F: Float>(input: &str) -> Result<(), CheckError> {
+    // Catch panics in case debug assertions within `std` fail.
+    let parsed = std::panic::catch_unwind(|| {
+        input.parse::<F>().map_err(|e| CheckError {
+            fail: CheckFailure::ParsingFailed(e.to_string().into()),
+            input: input.into(),
+            float_res: "none".into(),
+        })
+    })
+    .map_err(|e| convert_panic_error(&e, input))??;
+
+    // Parsed float, decoded into significand and exponent
+    let decoded = decode(parsed);
+
+    // Float parsed separately into a rational
+    let rational = Rational::parse(input);
+
+    // Verify that the values match
+    decoded.check(rational, input)
+}
+
+/// Turn panics into concrete error types.
+fn convert_panic_error(e: &dyn Any, input: &str) -> CheckError {
+    let msg = e
+        .downcast_ref::<String>()
+        .map(|s| s.as_str())
+        .or_else(|| e.downcast_ref::<&str>().copied())
+        .unwrap_or("(no contents)");
+
+    CheckError {
+        fail: CheckFailure::Panic(msg.into()),
+        input: input.into(),
+        float_res: "none".into(),
+    }
+}
+
+/// The result of parsing a string to a float type.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum FloatRes<F: Float> {
+    Inf,
+    NegInf,
+    Zero,
+    Nan,
+    /// A real number with significand and exponent. Value is `sig * 2 ^ exp`.
+    Real {
+        sig: F::SInt,
+        exp: i32,
+    },
+}
+
+#[derive(Clone, Debug)]
+pub struct CheckError {
+    pub fail: CheckFailure,
+    /// String for which parsing was attempted.
+    pub input: Box<str>,
+    /// The parsed & decomposed `FloatRes`, already stringified so we don't need generics here.
+    pub float_res: Box<str>,
+}
+
+impl<F: Float> FloatRes<F> {
+    /// Given a known exact rational, check that this representation is accurate within the
+    /// limits of the float representation. If not, construct a failure `Update` to send.
+    fn check(self, expected: Rational, input: &str) -> Result<(), CheckError> {
+        let consts = F::constants();
+        // let bool_helper = |cond: bool, err| cond.then_some(()).ok_or(err);
+
+        let res = match (expected, self) {
+            // Easy correct cases
+            (Rational::Inf, FloatRes::Inf)
+            | (Rational::NegInf, FloatRes::NegInf)
+            | (Rational::Nan, FloatRes::Nan) => Ok(()),
+
+            // Easy incorrect cases
+            (
+                Rational::Inf,
+                FloatRes::NegInf | FloatRes::Zero | FloatRes::Nan | FloatRes::Real { .. },
+            ) => Err(CheckFailure::ExpectedInf),
+            (
+                Rational::NegInf,
+                FloatRes::Inf | FloatRes::Zero | FloatRes::Nan | FloatRes::Real { .. },
+            ) => Err(CheckFailure::ExpectedNegInf),
+            (
+                Rational::Nan,
+                FloatRes::Inf | FloatRes::NegInf | FloatRes::Zero | FloatRes::Real { .. },
+            ) => Err(CheckFailure::ExpectedNan),
+            (Rational::Finite(_), FloatRes::Nan) => Err(CheckFailure::UnexpectedNan),
+
+            // Cases near limits
+            (Rational::Finite(r), FloatRes::Zero) => {
+                if r <= consts.zero_cutoff {
+                    Ok(())
+                } else {
+                    Err(CheckFailure::UnexpectedZero)
+                }
+            }
+            (Rational::Finite(r), FloatRes::Inf) => {
+                if r >= consts.inf_cutoff {
+                    Ok(())
+                } else {
+                    Err(CheckFailure::UnexpectedInf)
+                }
+            }
+            (Rational::Finite(r), FloatRes::NegInf) => {
+                if r <= consts.neg_inf_cutoff {
+                    Ok(())
+                } else {
+                    Err(CheckFailure::UnexpectedNegInf)
+                }
+            }
+
+            // Actual numbers
+            (Rational::Finite(r), FloatRes::Real { sig, exp }) => Self::validate_real(r, sig, exp),
+        };
+
+        res.map_err(|fail| CheckError {
+            fail,
+            input: input.into(),
+            float_res: format!("{self:?}").into(),
+        })
+    }
+
+    /// Check that `sig * 2^exp` is the same as `rational`, within the float's error margin.
+    fn validate_real(rational: BigRational, sig: F::SInt, exp: i32) -> Result<(), CheckFailure> {
+        let consts = F::constants();
+
+        // `2^exp`. Use cached powers of two to be faster.
+        let two_exp = consts
+            .powers_of_two
+            .get(&exp)
+            .unwrap_or_else(|| panic!("missing exponent {exp} for {}", type_name::<F>()));
+
+        // Rational from the parsed value, `sig * 2^exp`
+        let parsed_rational = two_exp * sig.to_bigint().unwrap();
+        let error = (parsed_rational - &rational).abs();
+
+        // Determine acceptable error at this exponent, which is halfway between this value
+        // (`sig * 2^exp`) and the next value up (`(sig+1) * 2^exp`).
+        let half_ulp = consts.half_ulp.get(&exp).unwrap();
+
+        // If we are within one error value (but not equal) then we rounded correctly.
+        if &error < half_ulp {
+            return Ok(());
+        }
+
+        // For values where we are exactly between two representable values, meaning that the error
+        // is exactly one half of the precision at that exponent, we need to round to an even
+        // binary value (i.e. mantissa ends in 0).
+        let incorrect_midpoint_rounding = if &error == half_ulp {
+            if sig & F::SInt::ONE == F::SInt::ZERO {
+                return Ok(());
+            }
+
+            // We rounded to odd rather than even; failing based on midpoint rounding.
+            true
+        } else {
+            // We are out of spec for some other reason.
+            false
+        };
+
+        let one_ulp = consts.half_ulp.get(&(exp + 1)).unwrap();
+        assert_eq!(one_ulp, &(half_ulp * &consts.two), "ULP values are incorrect");
+
+        let relative_error = error / one_ulp;
+
+        Err(CheckFailure::InvalidReal {
+            error_float: relative_error.to_f64(),
+            error_str: relative_error.to_string().into(),
+            incorrect_midpoint_rounding,
+        })
+    }
+
+    /// Remove trailing zeros in the significand and adjust the exponent
+    #[cfg(test)]
+    fn normalize(self) -> Self {
+        use std::cmp::min;
+
+        match self {
+            Self::Real { sig, exp } => {
+                // If there are trailing zeroes, remove them and increment the exponent instead
+                let shift = min(sig.trailing_zeros(), exp.wrapping_neg().try_into().unwrap());
+                Self::Real { sig: sig >> shift, exp: exp + i32::try_from(shift).unwrap() }
+            }
+            _ => self,
+        }
+    }
+}
+
+/// Decompose a float into its integral components. This includes the implicit bit.
+///
+/// If `allow_nan` is `false`, panic if `NaN` values are reached.
+fn decode<F: Float>(f: F) -> FloatRes<F> {
+    let ione = F::SInt::ONE;
+    let izero = F::SInt::ZERO;
+
+    let mut exponent_biased = f.exponent();
+    let mut mantissa = f.mantissa().to_signed();
+
+    if exponent_biased == 0 {
+        if mantissa == izero {
+            return FloatRes::Zero;
+        }
+
+        exponent_biased += 1;
+    } else if exponent_biased == F::EXP_SAT {
+        if mantissa != izero {
+            return FloatRes::Nan;
+        }
+
+        if f.is_sign_negative() {
+            return FloatRes::NegInf;
+        }
+
+        return FloatRes::Inf;
+    } else {
+        // Set implicit bit
+        mantissa |= ione << F::MAN_BITS;
+    }
+
+    let mut exponent = i32::try_from(exponent_biased).unwrap();
+
+    // Adjust for bias and the rnage of the mantissa
+    exponent -= i32::try_from(F::EXP_BIAS + F::MAN_BITS).unwrap();
+
+    if f.is_sign_negative() {
+        mantissa = mantissa.wrapping_neg();
+    }
+
+    FloatRes::Real { sig: mantissa, exp: exponent }
+}
+
+/// A rational or its unrepresentable values.
+#[derive(Clone, Debug, PartialEq)]
+enum Rational {
+    Inf,
+    NegInf,
+    Nan,
+    Finite(BigRational),
+}
+
+impl Rational {
+    /// Turn a string into a rational. `None` if `NaN`.
+    fn parse(s: &str) -> Rational {
+        let mut s = s; // lifetime rules
+
+        if s.strip_prefix('+').unwrap_or(s).eq_ignore_ascii_case("nan")
+            || s.eq_ignore_ascii_case("-nan")
+        {
+            return Rational::Nan;
+        }
+
+        if s.strip_prefix('+').unwrap_or(s).eq_ignore_ascii_case("inf") {
+            return Rational::Inf;
+        }
+
+        if s.eq_ignore_ascii_case("-inf") {
+            return Rational::NegInf;
+        }
+
+        // Fast path; no decimals or exponents ot parse
+        if s.bytes().all(|b| b.is_ascii_digit() || b == b'-') {
+            return Rational::Finite(BigRational::from_str(s).unwrap());
+        }
+
+        let mut ten_exp: i32 = 0;
+
+        // Remove and handle e.g. `e-4`, `e+10`, `e5` suffixes
+        if let Some(pos) = s.bytes().position(|b| b == b'e' || b == b'E') {
+            let (dec, exp) = s.split_at(pos);
+            s = dec;
+            ten_exp = exp[1..].parse().unwrap();
+        }
+
+        // Remove the decimal and instead change our exponent
+        // E.g. "12.3456" becomes "123456 * 10^-4"
+        let mut s_owned;
+        if let Some(pos) = s.bytes().position(|b| b == b'.') {
+            ten_exp = ten_exp.checked_sub((s.len() - pos - 1).try_into().unwrap()).unwrap();
+            s_owned = s.to_owned();
+            s_owned.remove(pos);
+            s = &s_owned;
+        }
+
+        // let pow = BigRational::from_u32(10).unwrap().pow(ten_exp);
+        let pow =
+            POWERS_OF_TEN.get(&ten_exp).unwrap_or_else(|| panic!("missing power of ten {ten_exp}"));
+        let r = pow
+            * BigInt::from_str(s)
+                .unwrap_or_else(|e| panic!("`BigInt::from_str(\"{s}\")` failed with {e}"));
+        Rational::Finite(r)
+    }
+
+    #[cfg(test)]
+    fn expect_finite(self) -> BigRational {
+        let Self::Finite(r) = self else {
+            panic!("got non rational: {self:?}");
+        };
+
+        r
+    }
+}
+
+#[cfg(test)]
+mod tests;
diff --git a/src/tools/test-float-parse/src/validate/tests.rs b/src/tools/test-float-parse/src/validate/tests.rs
new file mode 100644
index 00000000000..ab0e7d8a7ba
--- /dev/null
+++ b/src/tools/test-float-parse/src/validate/tests.rs
@@ -0,0 +1,149 @@
+use num::ToPrimitive;
+
+use super::*;
+
+#[test]
+fn test_parse_rational() {
+    assert_eq!(Rational::parse("1234").expect_finite(), BigRational::new(1234.into(), 1.into()));
+    assert_eq!(
+        Rational::parse("-1234").expect_finite(),
+        BigRational::new((-1234).into(), 1.into())
+    );
+    assert_eq!(Rational::parse("1e+6").expect_finite(), BigRational::new(1000000.into(), 1.into()));
+    assert_eq!(Rational::parse("1e-6").expect_finite(), BigRational::new(1.into(), 1000000.into()));
+    assert_eq!(
+        Rational::parse("10.4e6").expect_finite(),
+        BigRational::new(10400000.into(), 1.into())
+    );
+    assert_eq!(
+        Rational::parse("10.4e+6").expect_finite(),
+        BigRational::new(10400000.into(), 1.into())
+    );
+    assert_eq!(
+        Rational::parse("10.4e-6").expect_finite(),
+        BigRational::new(13.into(), 1250000.into())
+    );
+    assert_eq!(
+        Rational::parse("10.4243566462342456234124").expect_finite(),
+        BigRational::new(104243566462342456234124_i128.into(), 10000000000000000000000_i128.into())
+    );
+    assert_eq!(Rational::parse("inf"), Rational::Inf);
+    assert_eq!(Rational::parse("+inf"), Rational::Inf);
+    assert_eq!(Rational::parse("-inf"), Rational::NegInf);
+    assert_eq!(Rational::parse("NaN"), Rational::Nan);
+}
+
+#[test]
+fn test_decode() {
+    assert_eq!(decode(0f32), FloatRes::Zero);
+    assert_eq!(decode(f32::INFINITY), FloatRes::Inf);
+    assert_eq!(decode(f32::NEG_INFINITY), FloatRes::NegInf);
+    assert_eq!(decode(1.0f32).normalize(), FloatRes::Real { sig: 1, exp: 0 });
+    assert_eq!(decode(-1.0f32).normalize(), FloatRes::Real { sig: -1, exp: 0 });
+    assert_eq!(decode(100.0f32).normalize(), FloatRes::Real { sig: 100, exp: 0 });
+    assert_eq!(decode(100.5f32).normalize(), FloatRes::Real { sig: 201, exp: -1 });
+    assert_eq!(decode(-4.004f32).normalize(), FloatRes::Real { sig: -8396997, exp: -21 });
+    assert_eq!(decode(0.0004f32).normalize(), FloatRes::Real { sig: 13743895, exp: -35 });
+    assert_eq!(decode(f32::from_bits(0x1)).normalize(), FloatRes::Real { sig: 1, exp: -149 });
+}
+
+#[test]
+fn test_validate() {
+    validate::<f32>("0").unwrap();
+    validate::<f32>("-0").unwrap();
+    validate::<f32>("1").unwrap();
+    validate::<f32>("-1").unwrap();
+    validate::<f32>("1.1").unwrap();
+    validate::<f32>("-1.1").unwrap();
+    validate::<f32>("1e10").unwrap();
+    validate::<f32>("1e1000").unwrap();
+    validate::<f32>("-1e1000").unwrap();
+    validate::<f32>("1e-1000").unwrap();
+    validate::<f32>("-1e-1000").unwrap();
+}
+
+#[test]
+fn test_validate_real() {
+    // Most of the arbitrary values come from checking against <http://weitz.de/ieee/>.
+    let r = &BigRational::from_float(10.0).unwrap();
+    FloatRes::<f32>::validate_real(r.clone(), 10, 0).unwrap();
+    FloatRes::<f32>::validate_real(r.clone(), 10, -1).unwrap_err();
+    FloatRes::<f32>::validate_real(r.clone(), 10, 1).unwrap_err();
+
+    let r = &BigRational::from_float(0.25).unwrap();
+    FloatRes::<f32>::validate_real(r.clone(), 1, -2).unwrap();
+    FloatRes::<f32>::validate_real(r.clone(), 2, -2).unwrap_err();
+
+    let r = &BigRational::from_float(1234.5678).unwrap();
+    FloatRes::<f32>::validate_real(r.clone(), 0b100110100101001000101011, -13).unwrap();
+    FloatRes::<f32>::validate_real(r.clone(), 0b100110100101001000101010, -13).unwrap_err();
+    FloatRes::<f32>::validate_real(r.clone(), 0b100110100101001000101100, -13).unwrap_err();
+
+    let r = &BigRational::from_float(-1234.5678).unwrap();
+    FloatRes::<f32>::validate_real(r.clone(), -0b100110100101001000101011, -13).unwrap();
+    FloatRes::<f32>::validate_real(r.clone(), -0b100110100101001000101010, -13).unwrap_err();
+    FloatRes::<f32>::validate_real(r.clone(), -0b100110100101001000101100, -13).unwrap_err();
+}
+
+#[test]
+#[allow(unused)]
+fn test_validate_real_rounding() {
+    // Check that we catch when values don't round to even.
+
+    // For f32, the cutoff between 1.0 and the next value up (1.0000001) is
+    // 1.000000059604644775390625. Anything below it should round down, anything above it should
+    // round up, and the value itself should round _down_ because `1.0` has an even significand but
+    // 1.0000001 is odd.
+    let v1_low_down = Rational::parse("1.00000005960464477539062499999").expect_finite();
+    let v1_mid_down = Rational::parse("1.000000059604644775390625").expect_finite();
+    let v1_high_up = Rational::parse("1.00000005960464477539062500001").expect_finite();
+
+    let exp = -(f32::MAN_BITS as i32);
+    let v1_down_sig = 1 << f32::MAN_BITS;
+    let v1_up_sig = (1 << f32::MAN_BITS) | 0b1;
+
+    FloatRes::<f32>::validate_real(v1_low_down.clone(), v1_down_sig, exp).unwrap();
+    FloatRes::<f32>::validate_real(v1_mid_down.clone(), v1_down_sig, exp).unwrap();
+    FloatRes::<f32>::validate_real(v1_high_up.clone(), v1_up_sig, exp).unwrap();
+    FloatRes::<f32>::validate_real(-v1_low_down.clone(), -v1_down_sig, exp).unwrap();
+    FloatRes::<f32>::validate_real(-v1_mid_down.clone(), -v1_down_sig, exp).unwrap();
+    FloatRes::<f32>::validate_real(-v1_high_up.clone(), -v1_up_sig, exp).unwrap();
+
+    // 1.000000178813934326171875 is between 1.0000001 and the next value up, 1.0000002. The middle
+    // value here should round _up_ since 1.0000002 has an even mantissa.
+    let v2_low_down = Rational::parse("1.00000017881393432617187499999").expect_finite();
+    let v2_mid_up = Rational::parse("1.000000178813934326171875").expect_finite();
+    let v2_high_up = Rational::parse("1.00000017881393432617187500001").expect_finite();
+
+    let v2_down_sig = v1_up_sig;
+    let v2_up_sig = (1 << f32::MAN_BITS) | 0b10;
+
+    FloatRes::<f32>::validate_real(v2_low_down.clone(), v2_down_sig, exp).unwrap();
+    FloatRes::<f32>::validate_real(v2_mid_up.clone(), v2_up_sig, exp).unwrap();
+    FloatRes::<f32>::validate_real(v2_high_up.clone(), v2_up_sig, exp).unwrap();
+    FloatRes::<f32>::validate_real(-v2_low_down.clone(), -v2_down_sig, exp).unwrap();
+    FloatRes::<f32>::validate_real(-v2_mid_up.clone(), -v2_up_sig, exp).unwrap();
+    FloatRes::<f32>::validate_real(-v2_high_up.clone(), -v2_up_sig, exp).unwrap();
+
+    // Rounding the wrong direction should error
+    for res in [
+        FloatRes::<f32>::validate_real(v1_mid_down.clone(), v1_up_sig, exp),
+        FloatRes::<f32>::validate_real(v2_mid_up.clone(), v2_down_sig, exp),
+        FloatRes::<f32>::validate_real(-v1_mid_down.clone(), -v1_up_sig, exp),
+        FloatRes::<f32>::validate_real(-v2_mid_up.clone(), -v2_down_sig, exp),
+    ] {
+        let e = res.unwrap_err();
+        let CheckFailure::InvalidReal { incorrect_midpoint_rounding: true, .. } = e else {
+            panic!("{e:?}");
+        };
+    }
+}
+
+/// Just a quick check that the constants are what we expect.
+#[test]
+fn check_constants() {
+    assert_eq!(f32::constants().max.to_f32().unwrap(), f32::MAX);
+    assert_eq!(f32::constants().min_subnormal.to_f32().unwrap(), f32::from_bits(0x1));
+    assert_eq!(f64::constants().max.to_f64().unwrap(), f64::MAX);
+    assert_eq!(f64::constants().min_subnormal.to_f64().unwrap(), f64::from_bits(0x1));
+}
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 9f333cc43cf..fdca7a7a40e 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -74,13 +74,13 @@ pub(crate) const WORKSPACES: &[(&str, ExceptionList, Option<(&[&str], &[&str])>,
     ("compiler/rustc_codegen_gcc", EXCEPTIONS_GCC, None, &[]),
     ("src/bootstrap", EXCEPTIONS_BOOTSTRAP, None, &[]),
     ("src/ci/docker/host-x86_64/test-various/uefi_qemu_test", EXCEPTIONS_UEFI_QEMU_TEST, None, &[]),
-    ("src/etc/test-float-parse", EXCEPTIONS, None, &[]),
     ("src/tools/cargo", EXCEPTIONS_CARGO, None, &["src/tools/cargo"]),
     //("src/tools/miri/test-cargo-miri", &[], None), // FIXME uncomment once all deps are vendored
     //("src/tools/miri/test_dependencies", &[], None), // FIXME uncomment once all deps are vendored
     ("src/tools/rust-analyzer", EXCEPTIONS_RUST_ANALYZER, None, &[]),
     ("src/tools/rustbook", EXCEPTIONS_RUSTBOOK, None, &["src/doc/book", "src/doc/reference"]),
     ("src/tools/rustc-perf", EXCEPTIONS_RUSTC_PERF, None, &["src/tools/rustc-perf"]),
+    ("src/tools/test-float-parse", EXCEPTIONS, None, &[]),
     // tidy-alphabetical-end
 ];
 
diff --git a/src/tools/tidy/src/pal.rs b/src/tools/tidy/src/pal.rs
index c708ff7150c..9b915e0f737 100644
--- a/src/tools/tidy/src/pal.rs
+++ b/src/tools/tidy/src/pal.rs
@@ -36,6 +36,7 @@ use crate::walk::{filter_dirs, walk};
 
 // Paths that may contain platform-specific code.
 const EXCEPTION_PATHS: &[&str] = &[
+    "library/compiler-builtins",
     "library/windows_targets",
     "library/panic_abort",
     "library/panic_unwind",
diff --git a/src/tools/tidy/src/walk.rs b/src/tools/tidy/src/walk.rs
index 08ee5c16c12..c2c9eb8d250 100644
--- a/src/tools/tidy/src/walk.rs
+++ b/src/tools/tidy/src/walk.rs
@@ -14,6 +14,7 @@ pub fn filter_dirs(path: &Path) -> bool {
         "compiler/rustc_codegen_gcc",
         "src/llvm-project",
         "library/backtrace",
+        "library/compiler-builtins",
         "library/portable-simd",
         "library/stdarch",
         "src/tools/cargo",