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#![feature(async_fn_traits)]
#![allow(unused)]
use std::future::Future;
use std::ops::{AsyncFn, AsyncFnMut, AsyncFnOnce};
use std::pin::pin;
use std::task::*;
pub fn block_on<T>(fut: impl Future<Output = T>) -> T {
let mut fut = pin!(fut);
let ctx = &mut Context::from_waker(Waker::noop());
loop {
match fut.as_mut().poll(ctx) {
Poll::Pending => {}
Poll::Ready(t) => break t,
}
}
}
async fn call(f: &mut impl AsyncFn(i32)) {
f(0).await;
}
async fn call_mut(f: &mut impl AsyncFnMut(i32)) {
f(0).await;
}
async fn call_once(f: impl AsyncFnOnce(i32)) {
f(1).await;
}
async fn call_normal<F: Future<Output = ()>>(f: &impl Fn(i32) -> F) {
f(1).await;
}
async fn call_normal_mut<F: Future<Output = ()>>(f: &mut impl FnMut(i32) -> F) {
f(1).await;
}
pub fn main() {
block_on(async {
let b = 2i32;
let mut async_closure = async move |a: i32| {
println!("{a} {b}");
};
call(&mut async_closure).await;
call_mut(&mut async_closure).await;
call_once(async_closure).await;
let b = 2i32;
let mut async_closure = async |a: i32| {
println!("{a} {b}");
};
call_normal(&async_closure).await;
call_normal_mut(&mut async_closure).await;
call_once(async_closure).await;
});
}
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