Comment 0 for bug 309072

    (reported by Bruno Haible)
  The MOP says about slot-definition initialization:
  "The :NAME argument is a slot name. An ERROR is SIGNALled if this argument
   is not a symbol which can be used as a variable name. An ERROR is SIGNALled
   if this argument is not supplied."
  Test case:
   (make-instance (find-class 'sb-pcl:standard-direct-slot-definition))
  Expected: ERROR
  Got: #<SB-MOP:STANDARD-DIRECT-SLOT-DEFINITION NIL>