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This adds an `iter!` macro that can be used to create movable generators. This also adds a yield_expr feature so the `yield` keyword can be used within iter! macro bodies. This was needed because several unstable features each need `yield` expressions, so this allows us to stabilize them separately from any individual feature. Co-authored-by: Oli Scherer <github35764891676564198441@oli-obk.de> Co-authored-by: Jieyou Xu <jieyouxu@outlook.com> Co-authored-by: Travis Cross <tc@traviscross.com>
33 lines
787 B
Rust
33 lines
787 B
Rust
// This test ensures iterators created with the `iter!` macro are not
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// accidentally async closures.
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//
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//@ edition: 2024
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//@ remap-src-base
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#![feature(yield_expr, iter_macro)]
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use std::task::{Waker, Context};
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use std::iter::iter;
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use std::pin::pin;
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use std::future::Future;
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async fn call_async_once(f: impl AsyncFnOnce()) {
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f().await
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}
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fn main() {
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let f = iter! { move || {
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for i in 0..10 {
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yield i;
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}
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}};
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let x = pin!(call_async_once(f));
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//~^ ERROR AsyncFnOnce()` is not satisfied
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//~^^ ERROR AsyncFnOnce()` is not satisfied
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//~^^^ ERROR AsyncFnOnce()` is not satisfied
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//~^^^^ ERROR AsyncFnOnce()` is not satisfied
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x.poll(&mut Context::from_waker(Waker::noop()));
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//~^ ERROR AsyncFnOnce()` is not satisfied
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}
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