error[E0401]: can't reference `Self` constructor from outer item
  --> $DIR/do-not-ice-on-note_and_explain.rs:6:13
   |
LL | impl<B> A<B> {
   | ------------ the inner item doesn't inherit generics from this impl, so `Self` is invalid to reference
...
LL |             Self(1)
   |             ^^^^ help: replace `Self` with the actual type: `A`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0401`.