rebase fallout

Author: RalfJung

src/test/ui/union/union-move.stderr

@@ -27,7 +27,7 @@ LL |         move_out(x.f1_nocopy);
    |                  ^^^^^^^^^^^
    |                  |
    |                  cannot move out of here
-   |                  move occurs because `x.f1_nocopy` has type `std::cell::RefCell<i32>`, which does not implement the `Copy` trait
+   |                  move occurs because `x.f1_nocopy` has type `RefCell<i32>`, which does not implement the `Copy` trait
 
 error: aborting due to 3 previous errors