message: test mutating a non-mut static with interior mutability
diff: +use std::sync::atomic::{Ordering, AtomicUsize};
  +
  static mut X: usize = 5;
  +static Y: AtomicUsize = AtomicUsize::new(5);
  fn main() {
  unsafe {
  X = 6;
  assert_eq!(X, 6);
  }
  +
  + Y.store(6, Ordering::Relaxed);
  + assert_eq!(Y.load(Ordering::Relaxed), 6);
  }
  