33 lines
557 B
Rust
33 lines
557 B
Rust
//@ aux-build:block-on.rs
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//@ edition:2021
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//@ run-pass
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extern crate block_on;
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pub trait Trait {
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fn callback(&mut self);
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}
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impl Trait for (i32,) {
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fn callback(&mut self) {
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println!("hi {}", self.0);
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self.0 += 1;
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}
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}
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async fn call_once(f: impl AsyncFnOnce()) {
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f().await;
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}
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async fn run(mut loader: Box<dyn Trait>) {
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let f = async move || {
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loader.callback();
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loader.callback();
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};
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call_once(f).await;
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}
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fn main() {
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block_on::block_on(async {
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run(Box::new((42,))).await;
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});
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}
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