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Try to recover from a => -> = or -> typo in a match arm

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This commit is contained in:
Fabian Wolff 2021-10-03 14:14:35 +02:00
parent edebf77e00
commit cf19131cb3
4 changed files with 67 additions and 1 deletions
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16
compiler/rustc_parse/src/parser/expr.rs
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@ -2322,7 +2322,21 @@ impl<'a> Parser<'a> {
None
};
let arrow_span = this.token.span;
this.expect(&token::FatArrow)?;
if let Err(mut err) = this.expect(&token::FatArrow) {
// We might have a `=>` -> `=` or `->` typo (issue #89396).
if let token::Eq | token::RArrow = this.token.kind {
err.span_suggestion(
this.token.span,
"try using a fat arrow here",
"=>".to_string(),
Applicability::MaybeIncorrect,
);
err.emit();
this.bump();
} else {
return Err(err);
}
}
let arm_start_span = this.token.span;
let expr = this.parse_expr_res(Restrictions::STMT_EXPR, None).map_err(|mut err| {