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pub trait MakeRef<'a> {
type Ref;
}
impl<'a, T: 'a> MakeRef<'a> for T {
type Ref = &'a T;
}
pub trait MakeRef2 {
type Ref2;
}
impl<'a, T: 'a> MakeRef2 for T {
//~^ ERROR the lifetime parameter `'a` is not constrained
type Ref2 = <T as MakeRef<'a>>::Ref;
}
fn foo() -> <String as MakeRef2>::Ref2 { &String::from("foo") }
fn main() {
println!("{}", foo());
}
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