Reported for nethack.alt.org where impossible events in to-be-3.6.1 trigger a panic instead of just a warning, being polymorphed into a vampire and draining something to 0 HP (rather than killing it with the bite attack) didn't properly kill off the victim unless it was also being drained from level 0 to level -1, resulting in impossible "dmonsfree: 1 removed doesn't match 0 pending". If the hero got another move before dead monsters were purged, applying a stethscope to the victim could trigger an actual crash rather than an impossible escalated to a panic. Other actions such as attacking again probably could too. A followup included a diagnosis and one-line patch. I expanded the adjacent comment when manually putting the patch into place.
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41 KiB