+ * bug fix: redefining a class with different superclasses now correctly
+ removes it from the direct-subclasses of its previous superclasses.
+ (reported by David Morse)
+ * bug fix: (SETF FIND-CLASS) using a FORWARD-REFERENCED-CLASS as the
+ new value now works. (reported by Bruno Haible)
+ * bug fix: correct canonicalization of multiple non-standard slot
+ options in DEFCLASS as per AMOP 5.4.2. (reported by Bruno Haible)
+ * bug fix: SB-MOP:CLASS-PROTOTYPE now signals an error if the class
+ is not yet finalized, as required by AMOP. (reported by Bruno Haible)
+ * bug fix: SB-MOP:ALLOCATE-INSTANCE method for instances of BUILT-IN-CLASS
+ now exists, an signals an error.
+ * bug fix: duplicate LOOP variable bindings now signal PROGRAM-ERROR
+ during macroexpansion for non-iteration variables as well. (reported
+ by Bruno Haible for CMUCL)