bjoernager/rust
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Suggest 1-tuple parentheses, without existing parens

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This commit is contained in:
Rob Pilling 2021-12-04 17:33:59 +00:00
parent 427eba2f0b
commit 4738ce463e
3 changed files with 18 additions and 10 deletions
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20
compiler/rustc_infer/src/infer/error_reporting/mod.rs
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@ -2046,16 +2046,16 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
// build a tuple (issue #86100)
(ty::Tuple(_), _) if expected.tuple_fields().count() == 1 => {
if let Ok(code) = self.tcx.sess().source_map().span_to_snippet(span) {
if let Some(code) =
code.strip_prefix('(').and_then(|s| s.strip_suffix(')'))
{
err.span_suggestion(
span,
"use a trailing comma to create a tuple with one element",
format!("({},)", code),
Applicability::MaybeIncorrect,
);
}
let code_stripped = code
.strip_prefix('(')
.and_then(|s| s.strip_suffix(')'))
.unwrap_or(&code);
err.span_suggestion(
span,
"use a trailing comma to create a tuple with one element",
format!("({},)", code_stripped),
Applicability::MaybeIncorrect,
);
}
}
// If a character was expected and the found expression is a string literal