message: add FIXME test for coercing &mut to *const
diff: @@ -9,6 +9,7 @@ fn main() {
  mut_raw_mut();
  partially_invalidate_mut();
  drop_after_sharing();
  + direct_mut_to_const_raw();
  }
  // Deref a raw ptr to access a field of a large struct, where the field
  @@ -112,3 +113,13 @@ fn drop_after_sharing() {
  let x = String::from("hello!");
  let _len = x.len();
  }
  +
  +// Make sure that coercing &mut T to *const T produces a writeable pointer.
  +fn direct_mut_to_const_raw() {
  + // FIXME: This is currently disabled, waiting on a fix for <https://github.com/rust-lang/rust/issues/56604>
  + /*let x = &mut 0;
  + let y: *const i32 = x;
  + unsafe { *(y as *mut i32) = 1; }
  + assert_eq!(*x, 1);
  + */
  +}
  