4 #![cfg_attr(full, feature(adt_const_params))]
5 #![cfg_attr(full, allow(incomplete_features))]
9 impl<const H: feature> Foo {
10 //~^ ERROR: expected type, found built-in attribute `feature`
11 //~^^ ERROR: the const parameter `H` is not constrained by the impl trait, self type, or predicates