diff options
Diffstat (limited to 'compiler/rustc_parse/src')
| -rw-r--r-- | compiler/rustc_parse/src/errors.rs | 8 | ||||
| -rw-r--r-- | compiler/rustc_parse/src/parser/path.rs | 25 |
2 files changed, 24 insertions, 9 deletions
diff --git a/compiler/rustc_parse/src/errors.rs b/compiler/rustc_parse/src/errors.rs index aead216b61c..069217165fa 100644 --- a/compiler/rustc_parse/src/errors.rs +++ b/compiler/rustc_parse/src/errors.rs @@ -2324,3 +2324,11 @@ pub(crate) struct BadReturnTypeNotationOutput { #[suggestion(code = "", applicability = "maybe-incorrect")] pub span: Span, } + +#[derive(Diagnostic)] +#[diag(parse_bad_return_type_notation_dotdot)] +pub(crate) struct BadReturnTypeNotationDotDot { + #[primary_span] + #[suggestion(code = "", applicability = "maybe-incorrect")] + pub span: Span, +} diff --git a/compiler/rustc_parse/src/parser/path.rs b/compiler/rustc_parse/src/parser/path.rs index f1c9f0109f8..c25c23d849f 100644 --- a/compiler/rustc_parse/src/parser/path.rs +++ b/compiler/rustc_parse/src/parser/path.rs @@ -290,16 +290,17 @@ impl<'a> Parser<'a> { })?; let span = lo.to(self.prev_token.span); AngleBracketedArgs { args, span }.into() - } else if self.token.kind == token::OpenDelim(Delimiter::Parenthesis) + } else if self.may_recover() + && self.token.kind == token::OpenDelim(Delimiter::Parenthesis) // FIXME(return_type_notation): Could also recover `...` here. && self.look_ahead(1, |tok| tok.kind == token::DotDot) { - let lo = self.token.span; self.bump(); + self.sess + .emit_err(errors::BadReturnTypeNotationDotDot { span: self.token.span }); self.bump(); self.expect(&token::CloseDelim(Delimiter::Parenthesis))?; let span = lo.to(self.prev_token.span); - self.sess.gated_spans.gate(sym::return_type_notation, span); if self.eat_noexpect(&token::RArrow) { let lo = self.prev_token.span; @@ -308,7 +309,13 @@ impl<'a> Parser<'a> { .emit_err(errors::BadReturnTypeNotationOutput { span: lo.to(ty.span) }); } - P(GenericArgs::ReturnTypeNotation(span)) + ParenthesizedArgs { + span, + inputs: ThinVec::new(), + inputs_span: span, + output: ast::FnRetTy::Default(self.prev_token.span.shrink_to_hi()), + } + .into() } else { // `(T, U) -> R` let (inputs, _) = self.parse_paren_comma_seq(|p| p.parse_ty())?; @@ -566,13 +573,13 @@ impl<'a> Parser<'a> { }; let span = lo.to(self.prev_token.span); - // Gate associated type bounds, e.g., `Iterator<Item: Ord>`. if let AssocConstraintKind::Bound { .. } = kind { - if gen_args.as_ref().map_or(false, |args| { - matches!(args, GenericArgs::ReturnTypeNotation(..)) - }) { - // This is already gated in `parse_path_segment` + if let Some(ast::GenericArgs::Parenthesized(args)) = &gen_args + && args.inputs.is_empty() + && matches!(args.output, ast::FnRetTy::Default(..)) + { + self.sess.gated_spans.gate(sym::return_type_notation, span); } else { self.sess.gated_spans.gate(sym::associated_type_bounds, span); } |