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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>
30 lines
805 B
Rust
30 lines
805 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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// We test this both in a `narrow` and `wide` configuration because
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// the way that the diagnostic is emitted varies depending on the
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// diagnostic width. If it's too narrow to fit the explanation, that
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// explanation is moved to the `help` instead of the span label.
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//
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//@ edition: 2024
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//@ revisions: narrow wide
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//@[narrow] compile-flags: --diagnostic-width=20
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//@[wide] compile-flags: --diagnostic-width=300
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#![feature(yield_expr, iter_macro)]
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use std::iter::iter;
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fn call_async_once(_: impl AsyncFnOnce()) {}
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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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call_async_once(f);
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//~^ ERROR AsyncFnOnce()` is not satisfied
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}
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