1 error[E0277]: the type `std::cell::UnsafeCell<i32>` may contain interior mutability and a reference may not be safely transferrable across a catch_unwind boundary
2 --> $DIR/interior-mutability.rs:15:5
4 LL | catch_unwind(|| { x.set(23); });
5 | ^^^^^^^^^^^^ `std::cell::UnsafeCell<i32>` may contain interior mutability and a reference may not be safely transferrable across a catch_unwind boundary
7 = help: within `std::cell::Cell<i32>`, the trait `std::panic::RefUnwindSafe` is not implemented for `std::cell::UnsafeCell<i32>`
8 = note: required because it appears within the type `std::cell::Cell<i32>`
9 = note: required because of the requirements on the impl of `std::panic::UnwindSafe` for `&std::cell::Cell<i32>`
10 = note: required because it appears within the type `[closure@$DIR/interior-mutability.rs:15:18: 15:35 x:&std::cell::Cell<i32>]`
11 = note: required by `std::panic::catch_unwind`
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0277`.