Rollup merge of #136847 - nnethercote:simplify-intra-crate-quals, r=oli-obk

Simplify intra-crate qualifiers.

The following is a weird pattern for a file within `rustc_middle`:
```
use rustc_middle::aaa;
use crate::bbb;
```
More sensible and standard would be this:
```
use crate::{aaa, bbb};
```
I.e. we generally prefer using `crate::` to using a crate's own name. (Exceptions are things like in macros where `crate::` doesn't work because the macro is used in multiple crates.)

This commit fixes a bunch of these weird qualifiers.

r? `@jieyouxu`

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_errors/src/diagnostic_impls.rs b/compiler/rustc_errors/src/diagnostic_impls.rs
index d179396398f..14baf7554bc 100644
--- a/compiler/rustc_errors/src/diagnostic_impls.rs
+++ b/compiler/rustc_errors/src/diagnostic_impls.rs
@@ -108,13 +108,13 @@ impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::ExistentialTrait
 }
 
 impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::UnevaluatedConst<I> {
-    fn into_diag_arg(self) -> rustc_errors::DiagArgValue {
+    fn into_diag_arg(self) -> DiagArgValue {
         format!("{self:?}").into_diag_arg()
     }
 }
 
 impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::FnSig<I> {
-    fn into_diag_arg(self) -> rustc_errors::DiagArgValue {
+    fn into_diag_arg(self) -> DiagArgValue {
         format!("{self:?}").into_diag_arg()
     }
 }