30 lines
569 B
Rust
30 lines
569 B
Rust
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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::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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struct MyFuture;
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impl Future for MyFuture {
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type Output = i32;
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fn poll(self: std::pin::Pin<&mut Self>, _: &mut std::task::Context<'_>) -> Poll<Self::Output> {
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Poll::Ready(0)
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}
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}
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impl MyTrait for u32 {
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fn foo(&self) -> MyFuture {
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//~^ ERROR method `foo` should be async
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MyFuture
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}
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}
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fn main() {}
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