1 #![feature(impl_trait_in_fn_trait_return)]
4 fn a<'a>() -> impl Fn(&'a u8) -> (impl Debug + '_) {
5 //~^ ERROR cannot resolve opaque type
8 //~^ ERROR concrete type differs from previous defining opaque type use
11 fn _b<'a>() -> impl Fn(&'a u8) -> (impl Debug + 'a) {