38 lines
749 B
Rust
38 lines
749 B
Rust
// check-pass
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// edition: 2021
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#![feature(async_fn_in_trait)]
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#![feature(return_position_impl_trait_in_trait)]
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#![allow(incomplete_features)]
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use std::future::Future;
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use std::pin::Pin;
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use std::task::Poll;
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trait MyTrait {
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async fn foo(&self) -> i32;
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}
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#[derive(Clone)]
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struct MyFuture(i32);
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impl Future for MyFuture {
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type Output = i32;
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fn poll(
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self: Pin<&mut Self>,
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_: &mut std::task::Context<'_>,
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) -> Poll<<Self as Future>::Output> {
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Poll::Ready(self.0)
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}
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}
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impl MyTrait for i32 {
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// FIXME: this should eventually require `#[refine]` to compile, because it also provides
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// `Clone`.
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fn foo(&self) -> impl Future<Output = i32> + Clone {
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MyFuture(*self)
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}
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}
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fn main() {}
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