Rollup merge of #125795 - lucasscharenbroch:undescore-prefix-suggestion, r=compiler-errors

Improve renaming suggestion for names with leading underscores

Fixes #125650

Before:
```
error[E0425]: cannot find value `p` in this scope
 --> test.rs:2:13
  |
2 |     let _ = p;
  |             ^
  |
help: a local variable with a similar name exists, consider renaming `_p` into `p`
  |
1 | fn a(p: i32) {
  |      ~
```

After:
```
error[E0425]: cannot find value `p` in this scope
 --> test.rs:2:13
  |
1 | fn a(_p: i32) {
  |      -- `_p` defined here
2 |     let _ = p;
  |             ^
  |
help: the leading underscore in `_p` marks it as unused, consider renaming it to `p`
  |
1 | fn a(p: i32) {
  |      ~
```

This change doesn't exactly conform to what was proposed in the issue:

1. I've kept the suggested code instead of solely replacing it with the label
2. I've removed the "...similar name exists..." message instead of relocating to the usage span
3. You could argue that it still isn't completely clear that the change is referring to the definition (not the usage), but I'm not sure how to do this without playing down the fact that the error was caused by the usage of an undefined name.

1 files changed, 24 insertions, 14 deletions

diff --git a/compiler/rustc_resolve/src/diagnostics.rs b/compiler/rustc_resolve/src/diagnostics.rs
index 856cfbc01e8..d1541527cf5 100644
--- a/compiler/rustc_resolve/src/diagnostics.rs
+++ b/compiler/rustc_resolve/src/diagnostics.rs
@@ -1562,6 +1562,9 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             Some(suggestion) if suggestion.candidate == kw::Underscore => return false,
             Some(suggestion) => suggestion,
         };
+
+        let mut did_label_def_span = false;
+
         if let Some(def_span) = suggestion.res.opt_def_id().map(|def_id| self.def_span(def_id)) {
             if span.overlaps(def_span) {
                 // Don't suggest typo suggestion for itself like in the following:
@@ -1595,31 +1598,38 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                     errors::DefinedHere::SingleItem { span, candidate_descr, candidate }
                 }
             };
+            did_label_def_span = true;
             err.subdiagnostic(self.tcx.dcx(), label);
         }
 
-        let (span, sugg, post) = if let SuggestionTarget::SimilarlyNamed = suggestion.target
+        let (span, msg, sugg) = if let SuggestionTarget::SimilarlyNamed = suggestion.target
             && let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(span)
             && let Some(span) = suggestion.span
             && let Some(candidate) = suggestion.candidate.as_str().strip_prefix('_')
             && snippet == candidate
         {
+            let candidate = suggestion.candidate;
             // When the suggested binding change would be from `x` to `_x`, suggest changing the
             // original binding definition instead. (#60164)
-            let post = format!(", consider renaming `{}` into `{snippet}`", suggestion.candidate);
-            (span, snippet, post)
-        } else {
-            (span, suggestion.candidate.to_ident_string(), String::new())
-        };
-        let msg = match suggestion.target {
-            SuggestionTarget::SimilarlyNamed => format!(
-                "{} {} with a similar name exists{post}",
-                suggestion.res.article(),
-                suggestion.res.descr()
-            ),
-            SuggestionTarget::SingleItem => {
-                format!("maybe you meant this {}", suggestion.res.descr())
+            let msg = format!(
+                "the leading underscore in `{candidate}` marks it as unused, consider renaming it to `{snippet}`"
+            );
+            if !did_label_def_span {
+                err.span_label(span, format!("`{candidate}` defined here"));
             }
+            (span, msg, snippet)
+        } else {
+            let msg = match suggestion.target {
+                SuggestionTarget::SimilarlyNamed => format!(
+                    "{} {} with a similar name exists",
+                    suggestion.res.article(),
+                    suggestion.res.descr()
+                ),
+                SuggestionTarget::SingleItem => {
+                    format!("maybe you meant this {}", suggestion.res.descr())
+                }
+            };
+            (span, msg, suggestion.candidate.to_ident_string())
         };
         err.span_suggestion(span, msg, sugg, Applicability::MaybeIncorrect);
         true