File: sized-ret-with-binder.rs

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rustc 1.88.0%2Bdfsg1-2
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//@ check-pass

#![feature(unboxed_closures)]

fn is_fn<T: for<'a> Fn<(&'a (),)>>() {}
fn is_fn2<T: for<'a, 'b> Fn<(&'a &'b (),)>>() {}

struct Outlives<'a, 'b>(std::marker::PhantomData<&'a &'b ()>);

fn main() {
    is_fn::<for<'a> fn(&'a ()) -> &'a ()>();
    is_fn::<for<'a> fn(&'a ()) -> &'a dyn std::fmt::Debug>();
    is_fn2::<for<'a, 'b> fn(&'a &'b ()) -> Outlives<'a, 'b>>();
    is_fn2::<for<'a, 'b> fn(&'a &'b ()) -> (&'a (), &'a ())>();
}