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Right you are. I was assuming too much. Just because something may
have horrible consequences doesn't necessarily make it illegal.
Modifying constants in compiled code has the same legal status as
modifying the SYMBOL-NAME string of a symbol. ``It is an extremely
bad idea to modify'' a constant in compiled code. ``Such a
modification may tremendously confuse'' any function which contains a
constant EQUAL to the one being modified. For similar reasons, it is
a bad idea to modify any object which is used as a key in an EQUAL
hash table (this problem is unfortunately not mentioned in CLtL).