Commit [417910] Maximize Restore History

Make the printing of a slot-unbound error more error tolerant.

Especially against errors coming from custom PRINT-OBJECT methods, in which
case only print the TYPE-OF the instance. Also, print fully qualified
symbol names.

Slightly modified by Paul Khuong.

Attila Lendvai Attila Lendvai 2011-01-02

Paul Khuong Paul Khuong 2013-06-28

changed src/pcl/slots.lisp
src/pcl/slots.lisp Diff Switch to side-by-side view