View/Edit #3838:wall_ahead wall_behind

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1: if ((t = this:has_tick(player)) != 0)
2:   d = t.dir
3:   e = t.dir = verb[6] == "a" ? d | (d + 1) % 4 + 1
4:   w = !(this:exit_ahead() || this:enter_ahead())
5:   t.dir = d
6:   return index(args[1], t.wall[e]) && w
7: endif

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