I don't think it is legal for REMPROP to be equivalent to (SETF (GET
SYMBOL PROP) NIL), which seemed to be one of the possibilities mentioned
in the original mail. Doesn't GET return a second value indicating
whether the indicator was found or not, so that a value of NIL can be
distinguished from a NIL used to indicate failer? Or is it only the
hashing functions that do this?
barmar