Wed Feb  3 09:56:58 UTC 2010  pix@kepibu.org
  * Make condition printable, for easier manually stepping through tests.
hunk ./test/unification-tests.lisp 206
-(define-condition inner-error (unification-failure) ())
+(define-condition inner-error (unification-failure) ()
+  (:default-initargs :format-control "Inner error."))