error[E0204]: the trait `Copy` may not be implemented for this type | |
--> $DIR/union-copy.rs:24:6 | |
| | |
LL | a: String | |
| --------- this field does not implement `Copy` | |
... | |
LL | impl Copy for W {} //~ ERROR the trait `Copy` may not be implemented for this type | |
| ^^^^ | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0204`. |