Rollup merge of #127888 - estebank:type-param-sugg, r=compiler-errors

More accurate span for type parameter suggestion

After:

```
error[E0229]: associated item constraints are not allowed here
  --> $DIR/impl-block-params-declared-in-wrong-spot-issue-113073.rs:3:10
   |
LL | impl Foo<T: Default> for String {}
   |          ^^^^^^^^^^ associated item constraint not allowed here
   |
help: declare the type parameter right after the `impl` keyword
   |
LL - impl Foo<T: Default> for String {}
LL + impl<T: Default> Foo<T> for String {}
   |
```

Before:

```
error[E0229]: associated item constraints are not allowed here
  --> $DIR/impl-block-params-declared-in-wrong-spot-issue-113073.rs:3:10
   |
LL | impl Foo<T: Default> for String {}
   |          ^^^^^^^^^^ associated item constraint not allowed here
   |
help: declare the type parameter right after the `impl` keyword
   |
LL | impl<T: Default> Foo<T> for String {}
   |     ++++++++++++     ~
```

1 files changed, 5 insertions, 3 deletions

diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs
index cd0451b4165..968f38cf05d 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs
@@ -1338,11 +1338,13 @@ pub fn prohibit_assoc_item_constraint(
                                 format!("<{lifetimes}{type_with_constraints}>"),
                             )
                         };
-                        let suggestions =
-                            vec![param_decl, (constraint.span, format!("{}", matching_param.name))];
+                        let suggestions = vec![
+                            param_decl,
+                            (constraint.span.with_lo(constraint.ident.span.hi()), String::new()),
+                        ];
 
                         err.multipart_suggestion_verbose(
-                            format!("declare the type parameter right after the `impl` keyword"),
+                            "declare the type parameter right after the `impl` keyword",
                             suggestions,
                             Applicability::MaybeIncorrect,
                         );