24 lines
518 B
Rust
24 lines
518 B
Rust
//@ edition:2021
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#![feature(async_closure)]
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fn needs_async_fn(_: impl async Fn()) {}
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fn a() {
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let mut x = 1;
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needs_async_fn(async || {
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//~^ ERROR cannot borrow `x` as mutable, as it is a captured variable in a `Fn` closure
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x += 1;
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});
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}
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fn b() {
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let x = String::new();
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needs_async_fn(move || async move {
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//~^ ERROR expected a closure that implements the `async Fn` trait, but this closure only implements `async FnOnce`
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println!("{x}");
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});
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}
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fn main() {}
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