`impl Drop` return type results in `impl Sized`

```rs

fn impl_drop() -> impl Drop {
    let rec = impl_drop(); // incorrectly renders `impl Sized` in the hint
}

fn impl_sized() -> impl Sized {
    let rec = impl_sized(); // correctly renders `impl Sized` in the hint
}

fn impl_copy() -> impl Copy {
    let rec = impl_copy(); // correctly renders `impl Copy` in the hint
}

``````