use std::ptr::NonNull;
pub fn nonnull_bytes_overlap(a: NonNull<[u8]>, b: NonNull<[u8]>) -> bool {
let a_start = a.as_ptr() as *const u8 as usize;
let b_start = b.as_ptr() as *const u8 as usize;
let a_end = a_start + a.len();
let b_end = b_start + b.len();
a_start < b_end && b_start < a_end
}