mirror of https://github.com/rust-lang/rust
26 lines
618 B
Rust
26 lines
618 B
Rust
//@ aux-build:block-on.rs
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//@ edition:2021
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//@ build-pass
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//@ revisions: current next
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[next] compile-flags: -Znext-solver
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#![feature(async_closure)]
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use std::future::Future;
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extern crate block_on;
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// Check that closures that don't capture any state may implement `Fn`.
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fn main() {
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block_on::block_on(async {
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async fn call_once<F: Future>(x: impl FnOnce(&'static str) -> F) -> F::Output {
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x("hello, world").await
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}
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call_once(async |x: &'static str| {
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println!("hello, {x}");
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}).await
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});
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}
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