tests/ui/union/union-copy.stderr

   1 error[E0204]: the trait `Copy` may not be implemented for this type
   2   --> $DIR/union-copy.rs:12:15
   3    |
   4 LL |     a: std::mem::ManuallyDrop<String>
   5    |     --------------------------------- this field does not implement `Copy`
   6 ...
   7 LL | impl Copy for W {}
   8    |               ^
   9    |
  10 note: the `Copy` impl for `ManuallyDrop<String>` requires that `String: Copy`
  11   --> $DIR/union-copy.rs:8:8
  12    |
  13 LL |     a: std::mem::ManuallyDrop<String>
  14    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  15
  16 error: aborting due to previous error
  17
  18 For more information about this error, try `rustc --explain E0204`.