error[E0740]: unions may not contain fields that need dropping
  --> $DIR/union-with-drop-fields.rs:9:5
   |
LL |     a: String,
   |     ^^^^^^^^^
   |
note: `std::mem::ManuallyDrop` can be used to wrap the type
  --> $DIR/union-with-drop-fields.rs:9:5
   |
LL |     a: String,
   |     ^^^^^^^^^

error[E0740]: unions may not contain fields that need dropping
  --> $DIR/union-with-drop-fields.rs:17:5
   |
LL |     a: S,
   |     ^^^^
   |
note: `std::mem::ManuallyDrop` can be used to wrap the type
  --> $DIR/union-with-drop-fields.rs:17:5
   |
LL |     a: S,
   |     ^^^^

error[E0740]: unions may not contain fields that need dropping
  --> $DIR/union-with-drop-fields.rs:22:5
   |
LL |     a: T,
   |     ^^^^
   |
note: `std::mem::ManuallyDrop` can be used to wrap the type
  --> $DIR/union-with-drop-fields.rs:22:5
   |
LL |     a: T,
   |     ^^^^

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0740`.