Auto merge of #125645 - RalfJung:unclear_local_imports, r=nnethercote

add unqualified_local_imports lint

This lint helps deal with https://github.com/rust-lang/rustfmt/issues/4709 by having the compiler detect imports of local items that are not syntactically distinguishable from imports from other cates. Making them  syntactically distinguishable ensures rustfmt can consistently apply the desired import grouping.

3 files changed, 11 insertions, 8 deletions

diff --git a/compiler/rustc_const_eval/src/const_eval/mod.rs b/compiler/rustc_const_eval/src/const_eval/mod.rs
index 284eb912c20..48aeee2e6f0 100644
--- a/compiler/rustc_const_eval/src/const_eval/mod.rs
+++ b/compiler/rustc_const_eval/src/const_eval/mod.rs
@@ -16,12 +16,12 @@ mod fn_queries;
 mod machine;
 mod valtrees;
 
-pub use dummy_machine::*;
-pub use error::*;
-pub use eval_queries::*;
-pub use fn_queries::*;
-pub use machine::*;
-pub(crate) use valtrees::{eval_to_valtree, valtree_to_const_value};
+pub use self::dummy_machine::*;
+pub use self::error::*;
+pub use self::eval_queries::*;
+pub use self::fn_queries::*;
+pub use self::machine::*;
+pub(crate) use self::valtrees::{eval_to_valtree, valtree_to_const_value};
 
 // We forbid type-level constants that contain more than `VALTREE_MAX_NODES` nodes.
 const VALTREE_MAX_NODES: usize = 100000;
diff --git a/compiler/rustc_const_eval/src/interpret/mod.rs b/compiler/rustc_const_eval/src/interpret/mod.rs
index 669f5a597f8..5e84626f77e 100644
--- a/compiler/rustc_const_eval/src/interpret/mod.rs
+++ b/compiler/rustc_const_eval/src/interpret/mod.rs
@@ -19,12 +19,12 @@ mod util;
 mod validity;
 mod visitor;
 
-use eval_context::{from_known_layout, mir_assign_valid_types};
 #[doc(no_inline)]
 pub use rustc_middle::mir::interpret::*; // have all the `interpret` symbols in one place: here
 
 pub use self::call::FnArg;
 pub use self::eval_context::{InterpCx, format_interp_error};
+use self::eval_context::{from_known_layout, mir_assign_valid_types};
 pub use self::intern::{
     HasStaticRootDefId, InternKind, InternResult, intern_const_alloc_for_constprop,
     intern_const_alloc_recursive,
diff --git a/compiler/rustc_const_eval/src/lib.rs b/compiler/rustc_const_eval/src/lib.rs
index 73dda81bd29..cbe8a043fba 100644
--- a/compiler/rustc_const_eval/src/lib.rs
+++ b/compiler/rustc_const_eval/src/lib.rs
@@ -1,6 +1,8 @@
 // tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
+#![cfg_attr(not(bootstrap), feature(unqualified_local_imports))]
+#![cfg_attr(not(bootstrap), warn(unqualified_local_imports))]
 #![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
@@ -25,10 +27,11 @@ pub mod util;
 
 use std::sync::atomic::AtomicBool;
 
-pub use errors::ReportErrorExt;
 use rustc_middle::ty;
 use rustc_middle::util::Providers;
 
+pub use self::errors::ReportErrorExt;
+
 rustc_fluent_macro::fluent_messages! { "../messages.ftl" }
 
 pub fn provide(providers: &mut Providers) {