@verb #3838:"wall_ahead wall_behind" this none this rxdo #3135
@program #3838:"wall_ahead wall_behind" this none this
if ((t = this:has_tick(player)) != 0)
  d = t.dir
  e = t.dir = verb[6] == "a" ? d | (d + 1) % 4 + 1
  w = !(this:exit_ahead() || this:enter_ahead())
  t.dir = d
  return index(args[1], t.wall[e]) && w
endif
.