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Improve error message for missing trait in trait impl

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This commit is contained in:
Fabian Wolff 2021-09-12 22:05:52 +02:00
parent c7dbe7a830
commit 3f0e695919
4 changed files with 52 additions and 1 deletions
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15
compiler/rustc_parse/src/parser/item.rs
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@ -493,7 +493,20 @@ impl<'a> Parser<'a> {
let ty_first = if self.token.is_keyword(kw::For) && self.look_ahead(1, |t| t != &token::Lt)
{
let span = self.prev_token.span.between(self.token.span);
self.struct_span_err(span, "missing trait in a trait impl").emit();
self.struct_span_err(span, "missing trait in a trait impl")
.span_suggestion(
span,
"add a trait here",
" Trait ".into(),
Applicability::HasPlaceholders,
)
.span_suggestion(
span.to(self.token.span),
"for an inherent impl, drop this `for`",
"".into(),
Applicability::MaybeIncorrect,
)
.emit();
P(Ty {
kind: TyKind::Path(None, err_path(span)),
span,