impl Drop return type results in impl Sized

[Veykril]

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
}

[flodiebold]

I think we have some hack to ignore Drop bounds, this might be a side effect.

[ShoyuVanilla]

This is the side-effect of #11936 and I wonder whether that workaround is still needed since rustc removed impl ~const in rust-lang/rust/issues/110395