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error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
--> $DIR/issue-41073.rs:2:5
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LL | a: A,
| ^^^^
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= note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
help: wrap the field type in `ManuallyDrop<...>`
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LL | a: std::mem::ManuallyDrop<A>,
| +++++++++++++++++++++++ +
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0740`.
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