message: Pointer constructor assertions
  Summary: Documentation assertions.
diff: @@ -88,10 +88,12 @@ impl<'p, P> Pointer<'p, P> {
  }
  pub fn new_unfrozen_usize(x: usize) -> Self {
  + debug_assert!((x & TAG_BITS) == 0);
  Self::new(x | TAG_UNFROZEN)
  }
  pub fn new_frozen_usize(x: usize) -> Self {
  + debug_assert!((x & TAG_BITS) == 0);
  Self::new(x)
  }
  