IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a stone
(0, 1, D:1)
  a stone
(0, 2, D:1)
  a stone
(0, 3, D:1)
  a stone (still there?)
  a +0 club (still there?)
  a goblin corpse (still there?)
(4, -3, D:1)
  a +0 ring mail
(12, 3, D:1)
  a rat corpse
(12, 9, D:1)
  a +0 club
  a kobold corpse
(14, -1, D:1)
  a rat corpse
(14, 5, D:1)
  a +2 mace of distortion {!w}
(16, -4, D:1)
  a rat corpse
(18, -13, D:1)
  a rat corpse
(19, -13, D:1)
  a hobgoblin corpse
(20, 11, D:1)
  a gnoll corpse