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#![feature(async_closure)]
// edition:2021
fn foo<X>(x: impl FnOnce() -> Box<X>) {}
// just to make sure async closures can still be suggested for boxing.
fn bar<X>(x: Box<dyn FnOnce() -> X>) {}
fn main() {
foo(async move || {}); //~ ERROR mismatched types
bar(async move || {}); //~ ERROR mismatched types
}
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