From a bug report, but
just received: if you choked while eating a cockatrice egg and survived,
the turn-to-stone sequence wouldn't be initiated. For such eggs, turning
to stone starts when the food is finished rather than when it's started,
and fpostfx() wasn't called for food that triggered choking so the egg
went away without actually being finished. Fortune cookies, lumps of
royal jelly, and a few other things suffered from the same situation.
projects / nethack / commit