message: restrict cur_frame visibility
diff: @@ -268,7 +268,7 @@ pub struct Memory<'a, 'tcx, M: Machine<'tcx>> {
  writes_are_aligned: Cell<bool>,
  /// The current stack frame. Used to check accesses against locks.
  - pub cur_frame: usize,
  + pub(super) cur_frame: usize,
  }
  impl<'a, 'tcx, M: Machine<'tcx>> Memory<'a, 'tcx, M> {
  