/// # Safety
///
/// If any other `Rc` or [`Weak`] pointers to the same allocation exist, then
- /// they must be must not be dereferenced or have active borrows for the duration
+ /// they must not be dereferenced or have active borrows for the duration
/// of the returned borrow, and their inner type must be exactly the same as the
/// inner type of this Rc (including lifetimes). This is trivially the case if no
/// such pointers exist, for example immediately after `Rc::new`.
// This is a `NonNull` to allow optimizing the size of this type in enums,
// but it is not necessarily a valid pointer.
// `Weak::new` sets this to `usize::MAX` so that it doesn’t need
- // to allocate space on the heap. That's not a value a real pointer
+ // to allocate space on the heap. That's not a value a real pointer
// will ever have because RcBox has alignment at least 2.
// This is only possible when `T: Sized`; unsized `T` never dangle.
ptr: NonNull<RcBox<T>>,