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std::ptr::copy_nonoverlapping(page_ptr.add(8), next_page_ptr.add(8), PAGE_SIZE - 8);
// Iff n_roots == 1 when creating the environment, the two pointers are equal.
if page_ptr != next_page_ptr {
std::ptr::copy_nonoverlapping(page_ptr.add(8), next_page_ptr.add(8), PAGE_SIZE - 8);
}