Inventory traversal can be disrupted when items being traversed are
able to change inventory. I've lost track of how many times this
sort of thing has been discovered.
Report claimed that boiled potion of polymorph caused transformation
which resulted in dropped weapon and dropped or destroyed worn armor.
That was evidently a guess; potionbreathe() for that potion only
abuses constitution. The traceback showed 'you_were()' was involved.
Boiled potion of unholy water triggers human-to-beast transformation
of hero inflicted with lycanthropy, yielding similar situation.
I didn't notice anything unusual when reproducing this but inventory
was definitely vulnerable. My 'one line' fixes entries are steadily
getting to be more verbose; I may have to go back to 'fix bug'. :-}
e9624f2583