| error[E0658]: unions with non-`Copy` fields other than `ManuallyDrop<T>` are unstable |
| --> $DIR/feature-gate-untagged_unions.rs:20:5 |
| | |
| LL | a: std::cell::RefCell<i32>, |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| | |
| = note: see issue #55149 <https://github.com/rust-lang/rust/issues/55149> for more information |
| = help: add `#![feature(untagged_unions)]` to the crate attributes to enable |
| |
| error[E0740]: unions may not contain fields that need dropping |
| --> $DIR/feature-gate-untagged_unions.rs:16:5 |
| | |
| LL | a: String, |
| | ^^^^^^^^^ |
| | |
| note: `std::mem::ManuallyDrop` can be used to wrap the type |
| --> $DIR/feature-gate-untagged_unions.rs:16:5 |
| | |
| LL | a: String, |
| | ^^^^^^^^^ |
| |
| error[E0740]: unions may not contain fields that need dropping |
| --> $DIR/feature-gate-untagged_unions.rs:24:5 |
| | |
| LL | a: T, |
| | ^^^^ |
| | |
| note: `std::mem::ManuallyDrop` can be used to wrap the type |
| --> $DIR/feature-gate-untagged_unions.rs:24:5 |
| | |
| LL | a: T, |
| | ^^^^ |
| |
| error: aborting due to 3 previous errors |
| |
| Some errors have detailed explanations: E0658, E0740. |
| For more information about an error, try `rustc --explain E0658`. |
