Running the gcl ansi-tests on ecl cvs, I get a catastrophic failure (seg fault) in the defclass tests. The problem appears to be with SLOT-EXISTS-P, which is returning some weird object: > (defclass foo () ()) #<The STANDARD-CLASS FOO> > (slot-exists-p (make-instance 'foo) 'b) #<OBJNULL> > (it should return NIL.) Paul