IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a scroll of identify
(8, -5, D:1)
  a bat corpse
(11, 0, D:1)
  a potion of curing
(40, 3, D:1)
  a potion of haste
(42, 5, D:1)
  a scroll of identify
(44, 10, D:1)
  a +0 ring mail
(47, 8, D:1)
  a potion of haste