The Fountain Code Has Been Tightened Slightly So You Can No Longer Dip Objects Into A Fountain Or Drink From One While You Are Floating In Mid-air Due To Levitation.

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The fountain code has been tightened slightly so you can no longer dip
objects into a fountain or drink from one while you are floating in mid-air
due to levitation.
Teleporting to hell via a teleportation trap will no longer occur
if the character does not have fire resistance.
-- README file from the NetHack game

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