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Rollup merge of #132612 - compiler-errors:async-trait-bounds, r=lcnr

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Gate async fn trait bound modifier on `async_trait_bounds`

This PR moves `async Fn()` trait bounds into a new feature gate: `feature(async_trait_bounds)`. The general vibe is that we will most likely stabilize the `feature(async_closure)` *without* the `async Fn()` trait bound modifier, so we need to gate that separately.

We're trying to work on the general vision of `async` trait bound modifier general in: https://github.com/rust-lang/rfcs/pull/3710, however that RFC still needs more time for consensus to converge, and we've decided that the value that users get from calling the bound `async Fn()` is *not really* worth blocking landing async closures in general.
This commit is contained in:
Matthias Krüger 2024-12-03 17:27:05 +01:00 • committed by GitHub
commit c179a15f7a
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64 changed files with 147 additions and 106 deletions
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4
compiler/rustc_parse/src/parser/ty.rs
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@ -940,7 +940,7 @@ impl<'a> Parser<'a> {
let asyncness = if self.token.uninterpolated_span().at_least_rust_2018()
&& self.eat_keyword(kw::Async)
{
self.psess.gated_spans.gate(sym::async_closure, self.prev_token.span);
self.psess.gated_spans.gate(sym::async_trait_bounds, self.prev_token.span);
BoundAsyncness::Async(self.prev_token.span)
} else if self.may_recover()
&& self.token.uninterpolated_span().is_rust_2015()
@ -951,7 +951,7 @@ impl<'a> Parser<'a> {
span: self.prev_token.span,
help: HelpUseLatestEdition::new(),
});
self.psess.gated_spans.gate(sym::async_closure, self.prev_token.span);
self.psess.gated_spans.gate(sym::async_trait_bounds, self.prev_token.span);
BoundAsyncness::Async(self.prev_token.span)
} else {
BoundAsyncness::Normal