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Tweak invalid RTN errors

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Make suggestions verbose.

When encountering `method(type)` bound, suggest `method(..)` instead of `method()`.

```
error: argument types not allowed with return type notation
  --> $DIR/bad-inputs-and-output.rs:9:23
   |
LL | fn foo<T: Trait<method(i32): Send>>() {}
   |                       ^^^^^
   |
help: remove the input types
   |
LL - fn foo<T: Trait<method(i32): Send>>() {}
LL + fn foo<T: Trait<method(..): Send>>() {}
   |
```

When encountering both return type and arg list that isn't `..`, suggest replacing both.

```
error: return type not allowed with return type notation
  --> $DIR/bad-inputs-and-output.rs:12:25
   |
LL | fn bar<T: Trait<method() -> (): Send>>() {}
   |                         ^^^^^^
   |
help: use the right argument notation and remove the return type
   |
LL - fn bar<T: Trait<method() -> (): Send>>() {}
LL + fn bar<T: Trait<method(..): Send>>() {}
   |
```

When encountering a return type, suggest removing it including the leading whitespace.

```
error: return type not allowed with return type notation
  --> $DIR/bad-inputs-and-output.rs:24:45
   |
LL | fn bay_path<T: Trait>() where T::method(..) -> (): Send {}
   |                                             ^^^^^
   |
help: remove the return type
   |
LL - fn bay_path<T: Trait>() where T::method(..) -> (): Send {}
LL + fn bay_path<T: Trait>() where T::method(..): Send {}
   |
```
This commit is contained in:
Esteban Küber
2025-02-28 20:05:43 +00:00
parent f45d4acf1b
commit adb5ecabdb
9 changed files with 133 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
compiler/rustc_parse/src/errors.rs
View File

@@ -2922,8 +2922,9 @@ pub(crate) struct AddBoxNew {
#[diag(parse_bad_return_type_notation_output)]
pub(crate) struct BadReturnTypeNotationOutput {
#[primary_span]
#[suggestion(code = "", applicability = "maybe-incorrect", style = "verbose")]
pub span: Span,
#[suggestion(code = "", applicability = "maybe-incorrect", style = "verbose")]
pub suggestion: Span,
}
#[derive(Diagnostic)]

5
compiler/rustc_parse/src/parser/path.rs
View File

@@ -378,11 +378,14 @@ impl<'a> Parser<'a> {
self.psess.gated_spans.gate(sym::return_type_notation, span);
let prev_lo = self.prev_token.span.shrink_to_hi();
if self.eat_noexpect(&token::RArrow) {
let lo = self.prev_token.span;
let ty = self.parse_ty()?;
let span = lo.to(ty.span);
let suggestion = prev_lo.to(ty.span);
self.dcx()
.emit_err(errors::BadReturnTypeNotationOutput { span: lo.to(ty.span) });
.emit_err(errors::BadReturnTypeNotationOutput { span, suggestion });
}
P(ast::GenericArgs::ParenthesizedElided(span))