28 lines
646 B
Rust
28 lines
646 B
Rust
//@ build-pass
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//@ edition: 2021
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// Demonstrates that an async closure may implement `FnMut` (not just `async FnMut`!)
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// if it has no self-borrows. In this case, `&Ty` is not borrowed from the closure env,
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// since it's fine to reborrow it with its original lifetime. See the doc comment on
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// `should_reborrow_from_env_of_parent_coroutine_closure` for more detail for when we
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// must borrow from the closure env.
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#![feature(async_closure)]
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fn main() {
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hello(&Ty);
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}
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fn needs_fn_mut<T>(mut x: impl FnMut() -> T) {
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x();
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}
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fn hello(x: &Ty) {
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needs_fn_mut(async || { x.hello(); });
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}
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struct Ty;
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impl Ty {
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fn hello(&self) {}
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}
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