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Auto merge of #77524 - Patryk27:fixes/66228, r=estebank

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Rework diagnostics for wrong number of generic args (fixes #66228 and #71924)

This PR reworks the `wrong number of {} arguments` message, so that it provides more details and contextual hints.
This commit is contained in:
bors 2021-01-13 20:35:58 +00:00
commit a62a76047e
121 changed files with 2787 additions and 766 deletions
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3
compiler/rustc_parse/src/parser/path.rs
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@ -230,10 +230,11 @@ impl<'a> Parser<'a> {
} else {
// `(T, U) -> R`
let (inputs, _) = self.parse_paren_comma_seq(|p| p.parse_ty())?;
let inputs_span = lo.to(self.prev_token.span);
let span = ident.span.to(self.prev_token.span);
let output =
self.parse_ret_ty(AllowPlus::No, RecoverQPath::No, RecoverReturnSign::No)?;
ParenthesizedArgs { inputs, output, span }.into()
ParenthesizedArgs { span, inputs, inputs_span, output }.into()
};
PathSegment { ident, args, id: ast::DUMMY_NODE_ID }