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Rollup merge of #127557 - linyihai:issue-126694, r=compiler-errors

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Add a label to point to the lacking macro name definition

Fixes https://github.com/rust-lang/rust/issues/126694, but adopts the suggestion from https://github.com/rust-lang/rust/issues/118295

```
 --> src/main.rs:1:14
  |
1 | macro_rules! {
  |            ^ put a macro name here
```
This commit is contained in:
Trevor Gross 2024-07-26 02:20:30 -04:00 • committed by GitHub
commit c5788d618e
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6 changed files with 30 additions and 8 deletions
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5
compiler/rustc_resolve/src/diagnostics.rs
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@ -1448,7 +1448,10 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
);
if macro_kind == MacroKind::Bang && ident.name == sym::macro_rules {
err.subdiagnostic(MaybeMissingMacroRulesName { span: ident.span });
let label_span = ident.span.shrink_to_hi();
let mut spans = MultiSpan::from_span(label_span);
spans.push_span_label(label_span, "put a macro name here");
err.subdiagnostic(MaybeMissingMacroRulesName { spans: spans });
return;
}