mirror of https://github.com/rust-lang/rust
59 lines
1.3 KiB
Rust
59 lines
1.3 KiB
Rust
//@ edition:2024
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//@ compile-flags: -Zunstable-options
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//@ revisions: current next
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//@[next] compile-flags: -Znext-solver
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//@ check-pass
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// Makes sure that we support closure/coroutine goals where the signature of
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// the item references higher-ranked lifetimes from the *predicate* binder,
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// not its own internal signature binder.
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//
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// This was fixed in <https://github.com/rust-lang/rust/pull/122267>.
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#![feature(unboxed_closures, gen_blocks)]
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trait Dispatch {
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fn dispatch(self);
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}
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struct Fut<T>(T);
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impl<T: for<'a> Fn<(&'a (),)>> Dispatch for Fut<T>
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where
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for<'a> <T as FnOnce<(&'a (),)>>::Output: Future,
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{
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fn dispatch(self) {
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(self.0)(&());
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}
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}
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struct Gen<T>(T);
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impl<T: for<'a> Fn<(&'a (),)>> Dispatch for Gen<T>
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where
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for<'a> <T as FnOnce<(&'a (),)>>::Output: Iterator,
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{
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fn dispatch(self) {
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(self.0)(&());
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}
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}
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struct Closure<T>(T);
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impl<T: for<'a> Fn<(&'a (),)>> Dispatch for Closure<T>
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where
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for<'a> <T as FnOnce<(&'a (),)>>::Output: Fn<(&'a (),)>,
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{
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fn dispatch(self) {
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(self.0)(&())(&());
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}
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}
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fn main() {
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async fn foo(_: &()) {}
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Fut(foo).dispatch();
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gen fn bar(_: &()) {}
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Gen(bar).dispatch();
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fn uwu<'a>(x: &'a ()) -> impl Fn(&'a ()) { |_| {} }
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Closure(uwu).dispatch();
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}
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