mirror of https://github.com/rust-lang/rust.git
43 lines
1.0 KiB
Rust
43 lines
1.0 KiB
Rust
//! This test checks that we can resolve the `boxed` method call to `FutureExt`,
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//! because we know that the anonymous future does not implement `StreamExt`.
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//@ edition: 2021
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//@ check-pass
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use std::future::Future;
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use std::pin::Pin;
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trait FutureExt: Future + Sized + Send + 'static {
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fn boxed(self) -> Pin<Box<dyn Future<Output = Self::Output> + Send + 'static>> {
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Box::pin(self)
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}
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}
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trait StreamExt: Future + Sized + Send + 'static {
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fn boxed(self) -> Pin<Box<dyn Future<Output = Self::Output> + Send + 'static>> {
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Box::pin(self)
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}
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}
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impl<T: Future + Sized + Send + 'static> FutureExt for T {}
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fn go(i: usize) -> impl Future<Output = ()> + Send + 'static {
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async move {
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if i != 0 {
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spawn(async move {
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let fut = go(i - 1).boxed();
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fut.await;
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})
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.await;
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}
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}
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}
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pub fn spawn<T: Send>(
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_: impl Future<Output = T> + Send + 'static,
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) -> impl Future<Output = ()> + Send + 'static {
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async move { todo!() }
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}
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fn main() {}
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