bjoernager/rust
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Suggest async {} for async || {}

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Fixes #76011

This adds support for adding help diagnostics to the feature gating checks and
then uses it for the async_closure gate to add the extra bit of help
information as described in the issue.
This commit is contained in:
Andy Weiss 2020-09-09 15:16:34 -07:00
parent 25b2f48612
commit 5b475a4618
5 changed files with 34 additions and 17 deletions
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9
compiler/rustc_parse/src/parser/expr.rs
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@ -1554,10 +1554,6 @@ impl<'a> Parser<'a> {
} else {
Async::No
};
if let Async::Yes { span, .. } = asyncness {
// Feature-gate `async ||` closures.
self.sess.gated_spans.gate(sym::async_closure, span);
}
let capture_clause = self.parse_capture_clause();
let decl = self.parse_fn_block_decl()?;
@ -1574,6 +1570,11 @@ impl<'a> Parser<'a> {
}
};
if let Async::Yes { span, .. } = asyncness {
// Feature-gate `async ||` closures.
self.sess.gated_spans.gate(sym::async_closure, span);
}
Ok(self.mk_expr(
lo.to(body.span),
ExprKind::Closure(capture_clause, asyncness, movability, decl, body, lo.to(decl_hi)),