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
  --> $DIR/not-panic-safe-5.rs:9:5
   |
LL | fn assert<T: UnwindSafe + ?Sized>() {}
   |              ---------- required by this bound in `assert`
...
LL |     assert::<*const UnsafeCell<i32>>();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `std::cell::UnsafeCell<i32>` may contain interior mutability and a reference may not be safely transferrable across a catch_unwind boundary
   |
   = help: the trait `std::panic::RefUnwindSafe` is not implemented for `std::cell::UnsafeCell<i32>`
   = note: required because of the requirements on the impl of `std::panic::UnwindSafe` for `*const std::cell::UnsafeCell<i32>`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.