src/test/ui/not-panic/not-panic-safe-4.stderr

   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/not-panic-safe-4.rs:9:5
   3    |
   4 LL | fn assert<T: UnwindSafe + ?Sized>() {}
   5    |              ---------- required by this bound in `assert`
   6 ...
   7 LL |     assert::<&RefCell<i32>>();
   8    |     ^^^^^^^^^^^^^^^^^^^^^^^ `std::cell::UnsafeCell<i32>` may contain interior mutability and a reference may not be safely transferrable across a catch_unwind boundary
   9    |
  10    = help: within `std::cell::RefCell<i32>`, the trait `std::panic::RefUnwindSafe` is not implemented for `std::cell::UnsafeCell<i32>`
  11    = note: required because it appears within the type `std::cell::RefCell<i32>`
  12    = note: required because of the requirements on the impl of `std::panic::UnwindSafe` for `&std::cell::RefCell<i32>`
  13
  14 error[E0277]: the type `std::cell::UnsafeCell<isize>` may contain interior mutability and a reference may not be safely transferrable across a catch_unwind boundary
  15   --> $DIR/not-panic-safe-4.rs:9:5
  16    |
  17 LL | fn assert<T: UnwindSafe + ?Sized>() {}
  18    |              ---------- required by this bound in `assert`
  19 ...
  20 LL |     assert::<&RefCell<i32>>();
  21    |     ^^^^^^^^^^^^^^^^^^^^^^^ `std::cell::UnsafeCell<isize>` may contain interior mutability and a reference may not be safely transferrable across a catch_unwind boundary
  22    |
  23    = help: within `std::cell::RefCell<i32>`, the trait `std::panic::RefUnwindSafe` is not implemented for `std::cell::UnsafeCell<isize>`
  24    = note: required because it appears within the type `std::cell::Cell<isize>`
  25    = note: required because it appears within the type `std::cell::RefCell<i32>`
  26    = note: required because of the requirements on the impl of `std::panic::UnwindSafe` for `&std::cell::RefCell<i32>`
  27
  28 error: aborting due to 2 previous errors
  29
  30 For more information about this error, try `rustc --explain E0277`.