File: variance_constraints.rs

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//@ check-pass
// issue #69184

trait A {
    type B<'a> where Self: 'a;

    fn make_b<'a>(&'a self) -> Self::B<'a>;
}

struct S {}
impl A for S {
    type B<'a> = &'a S;
    fn make_b<'a>(&'a self) -> &'a Self {
        self
    }
}

enum E<'a> {
    S(<S as A>::B<'a>),
}

fn main() {}