error: Can't resolve trait reference.

       Please check that referenced trait also has #[mocked] attribute:

           #[mocked] // <- Parent trait must have this
           trait A {}

           #[mocked(refs = "A => ::A")]
           trait B : A {}

 --> $DIR/unresolved_parent_ref.rs:6:11
  |
6 | trait B : A {}
  |           ^