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29 lines
510 B
Rust
29 lines
510 B
Rust
#![feature(type_alias_impl_trait)]
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// edition:2021
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// check-pass
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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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type OpeningReadFuture<'a> =
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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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fn read_fut(&mut self) -> OpeningReadFuture<'_> {
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self.read()
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}
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}
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fn main() {}
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