src/test/ui/union/issue-41073.stderr

   1 error[E0740]: unions cannot contain fields that may need dropping
   2   --> $DIR/issue-41073.rs:4:5
   3    |
   4 LL |     a: A,
   5    |     ^^^^
   6    |
   7    = note: a type is guaranteed not to need dropping when it implements `Copy`, or when it is the special `ManuallyDrop<_>` type
   8 help: when the type does not implement `Copy`, wrap it inside a `ManuallyDrop<_>` and ensure it is manually dropped
   9    |
  10 LL |     a: std::mem::ManuallyDrop<A>,
  11    |        +++++++++++++++++++++++ +
  12
  13 error: aborting due to previous error
  14
  15 For more information about this error, try `rustc --explain E0740`.