mirror of https://github.com/rust-lang/rust
38 lines
725 B
Rust
38 lines
725 B
Rust
#![feature(type_alias_impl_trait)]
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//@ edition:2021
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//@ check-pass
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//@ revisions: tait rpit
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struct Pending {}
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struct CantOpen {}
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trait AsyncRead {}
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impl AsyncRead for i32 {}
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type PendingReader<'a> = impl AsyncRead + 'a;
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#[cfg(tait)]
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type OpeningReadFuture<'a> = impl std::future::Future<Output = Result<PendingReader<'a>, CantOpen>>;
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impl Pending {
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async fn read(&mut self) -> Result<impl AsyncRead + '_, CantOpen> {
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Ok(42)
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}
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#[cfg(tait)]
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fn read_fut(&mut self) -> OpeningReadFuture<'_> {
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self.read()
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}
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#[cfg(rpit)]
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fn read_fut(
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&mut self,
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) -> impl std::future::Future<Output = Result<PendingReader<'_>, CantOpen>> {
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self.read()
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}
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}
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fn main() {}
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