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