1 error: concrete type differs from previous defining opaque type use
2 --> $DIR/impl-fn-predefined-lifetimes.rs:7:9
5 | ^ expected `impl Debug + '_`, got `&u8`
7 note: previous use here
8 --> $DIR/impl-fn-predefined-lifetimes.rs:7:5
13 error[E0720]: cannot resolve opaque type
14 --> $DIR/impl-fn-predefined-lifetimes.rs:4:35
16 LL | fn a<'a>() -> impl Fn(&'a u8) -> (impl Debug + '_) {
17 | ^^^^^^^^^^^^^^^ cannot resolve opaque type
19 error: aborting due to 2 previous errors
21 For more information about this error, try `rustc --explain E0720`.