"It was hidden under a green mold corpse! It bites!"
Never seen corpse from a never seen monster can be
revealed by the hider.
-problem is that the corpse of the monster is
always created with dknown set to 1 when make_corpse() finishes,
even in the case where you never knew what it was while alive.
some with "or a splash of venom" after having looked at a '.' item
martial arts kick that knocks a monster into a trap would result in warning
"dmonsfree: 1 removed doesn't match 2 pending" if the trap was fatal
+if you can't see or sense a monster when it dies, don't set dknown on corpse
Platform- and/or Interface-Specific Fixes
if (mtmp->mnamelth)
obj = oname(obj, NAME(mtmp));
+ /* Avoid "It was hidden under a green mold corpse!"
+ * during Blind combat. An unseen monster referred to as "it"
+ * could be killed and leave a corpse. If a hider then hid
+ * underneath it, you could be told the corpse type of a
+ * monster that you never knew was there without this.
+ */
+ if (Blind && !sensemon(mtmp)) obj->dknown = 0;
+
#ifdef INVISIBLE_OBJECTS
/* Invisible monster ==> invisible corpse */
obj->oinvis = mtmp->minvis;