bjoernager/rust
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Fix "missing match arm body" suggestion involving !

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Include the match arm guard in the gated span, so that the suggestion to add a body is correct instead of inserting the body before the guard.

Make the suggestion verbose.

```
error: `match` arm with no body
  --> $DIR/feature-gate-never_patterns.rs:43:9
   |
LL |         Some(_) if false,
   |         ^^^^^^^^^^^^^^^^
   |
help: add a body after the pattern
   |
LL |         Some(_) if false => { todo!() },
   |                          ++++++++++++++
```
This commit is contained in:
Esteban Küber 2025-02-22 18:29:12 +00:00
parent dc37ff82e8
commit a8f8b8de66
5 changed files with 94 additions and 16 deletions
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3
compiler/rustc_parse/src/parser/expr.rs
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@ -3125,10 +3125,11 @@ impl<'a> Parser<'a> {
let mut result = if armless {
// A pattern without a body, allowed for never patterns.
arm_body = None;
let span = lo.to(this.prev_token.span);
this.expect_one_of(&[exp!(Comma)], &[exp!(CloseBrace)]).map(|x| {
// Don't gate twice
if !pat.contains_never_pattern() {
this.psess.gated_spans.gate(sym::never_patterns, pat.span);
this.psess.gated_spans.gate(sym::never_patterns, span);
}
x
})