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#![feature(type_alias_impl_trait)]
// build-pass
trait T { type Item; }
type Alias<'a> = impl T<Item = &'a ()>;
struct S;
impl<'a> T for &'a S {
type Item = &'a ();
}
fn filter_positive<'a>() -> Alias<'a> {
&S
}
fn with_positive(fun: impl Fn(Alias<'_>)) {
fun(filter_positive());
}
fn main() {
with_positive(|_| ());
}
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