38 lines
769 B
Rust
38 lines
769 B
Rust
//@ check-pass
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//@ edition:2021
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use std::fmt::{self, Display};
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use std::future::Future;
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use std::io;
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use std::pin::Pin;
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use std::task::{Context, Poll};
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struct AsyncStdout;
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impl AsyncStdout {
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fn write_fmt<'a>(&'a mut self, _args: fmt::Arguments) -> WriteFmtFuture<'a, Self>
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where
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Self: Unpin,
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{
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WriteFmtFuture(self)
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}
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}
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struct WriteFmtFuture<'a, T>(&'a mut T);
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impl<'a, T> Future for WriteFmtFuture<'a, T> {
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type Output = io::Result<()>;
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fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
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unimplemented!()
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}
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}
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async fn async_main() {
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let _write = write!(&mut AsyncStdout, "...").await;
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let _writeln = writeln!(&mut AsyncStdout, "...").await;
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}
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fn main() {
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let _ = async_main;
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}
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