File: issue-27281.rs

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//@ check-pass
pub trait Trait<'a> {
    type T;
    type U;
    fn foo(&self, s: &'a ()) -> &'a ();
}

impl<'a> Trait<'a> for () {
    type T = &'a ();
    type U = Self::T;

    fn foo(&self, s: &'a ()) -> &'a () {
        let t: Self::T = s; t
    }
}

fn main() {}