ref: e616d7aac9fff2d65bde4c6f8dcfc8d1222dc803
parent: 68f9fae973e2ffb6c0b9ed1e0761d3a0768455ad
author: Ben Harris <bjh21@bjh21.me.uk>
date: Sat Jan 7 15:33:42 EST 2023
Mosaic: fault out-of-bounds moves in execute_move() Returning NULL in this case is better than dereferencing it.