Remove unsafe qualifier from RefCell::as_unsafe_cell
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This method is no longer unsafe because the field of `UnsafeCell` is no longer public.
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Remove `unsafe` qualifier from `RefCell::as_unsafe_cell` This method is no longer unsafe because the field of `UnsafeCell` is no longer public.
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This method is no longer unsafe because the field of
UnsafeCellis nolonger public.