trait Test<'a> {
    fn get<'b: 'a>(&'b self) -> &'a i32;
}

struct TestStruct<'a> {
    t: Test<'a>,
}

struct Foo(i32);
impl<'a> Test<'a> for Foo {
    fn get<'b: 'a>(&'b self) -> &'a i32 {
        return &self.0;
    }
}

fn main() {
    let ts = TestStruct {t: Foo(0)};
}