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Can Pin>> violate the pin gurantee?
Since RefCell<T> allows for interior mutability, then obtaining a mut &T using RefCell::borrow_mut(), we can do a move via mem::replace(), and that too in (apparently) safe code; whereas documentation for Pin<T> states, that it isn't possible for safe code to obtain a reference to &mut T.
Intutively, it appears that it violates the pin gurantee; or, am I wrong here?
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