struct Foo<'a> {
    f: &'a u32,
}

struct Bar<'a, 'b> {
    a: &'a (),
    b: &'b (),
}

trait Test {
    fn test(&mut self);
}

// works
impl Test for Foo<'static> {
    fn test(&mut self) {

    }
}

// doesn't work
impl Drop for Foo<'static> {
    fn drop(&mut self) {

    }
}

// works
impl<'a, 'b: 'a> Test for Bar<'a, 'b> {
    fn test(&mut self) {

    }
}

// doesn't work
impl<'a, 'b: 'a> Drop for Bar<'a, 'b> {
    fn drop(&mut self) {

    }
}