[rustc.git] / src / test / ui / impl-trait / issues / issue-89312.rs

#![feature(type_alias_impl_trait)]

// check-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(|_| ());
}
Commit	Line	Data
ee023bcb FG	1	#![feature(type_alias_impl_trait)]
	2
	3	// check-pass
	4
	5	trait T { type Item; }
	6
	7	type Alias<'a> = impl T<Item = &'a ()>;
	8
	9	struct S;
	10	impl<'a> T for &'a S {
	11	type Item = &'a ();
	12	}
	13
	14	fn filter_positive<'a>() -> Alias<'a> {
	15	&S
	16	}
	17
	18	fn with_positive(fun: impl Fn(Alias<'_>)) {
	19	fun(filter_positive());
	20	}
	21
	22	fn main() {
	23	with_positive(\|_\| ());
	24	}