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fn main() { let mut dst: Vec<u8> = vec![b'a', b'b', b'c', b'd', b'e']; let src: Vec<u8> = vec![b'A', b'B', b'C']; let dst_sl = dst.as_mut_slice(); let src_sl = src.as_slice(); let _ = memx::memcpy(dst_sl, src_sl); }