The below warning about the meta-class seems spurious... - Willem CMU Common Lisp 20b-pre2 (20B Unicode), running on framboos With core: /home/willem/lisp/cmucl-20b-pre2/lib/cmucl/lib/lisp-sse2.core Dumped on: Mon, 2010-09-06 19:12:52+02:00 on lorien2 See <http://www.cons.org/cmucl/> for support information. Loaded subsystems: Unicode 1.8 with Unicode version 5.1.0 Python 1.1, target Intel x86/sse2 CLOS based on Gerd's PCL 2010-03-19 15:19:03 * (defclass foo (standard-generic-function) () (:metaclass pcl:funcallable-standard-class)) Warning: Changing meta-class of FOO from KERNEL::STANDARD-CLASS to KERNEL:RANDOM-PCL-CLASS. #<FUNCALLABLE-STANDARD-CLASS FOO {581A5515}> *