const THING: [u8; 4] = [0x61, 0x62, 0x63, 0x64];

// replace ^^^ with a bytestring
// const THING: [u8; 4] = b"abcd"[..4];

fn main() {
  // NO COPYING ALLOWED HERE PLZTKS
  i_need_a_four_byte_array(THING)
}

// CAN'T CHANGE THIS
fn i_need_a_four_byte_array(thing: [u8; 4]) {
  println!("{:?}", thing);
}