Tries to grow the current allocation in-place. If that isn't possible, this function is a no-op. # Safety `ptr` must point to a valid allocation of `old_size` blocks. Also, `new_size > old_size`. # Errors Will return `AllocError` if the grow was unsuccessful, in which case this function was a no-op.
( &self, ptr: NonNull<u8>, old_size: usize, new_size: usize, )
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