0.8.3.74:

[sbcl.git] / src / pcl / braid.lisp

diff --git a/src/pcl/braid.lisp b/src/pcl/braid.lisp
index 066e6c4..82f1563 100644 (file)
--- a/src/pcl/braid.lisp
+++ b/src/pcl/braid.lisp
@@ -720,3 +720,20 @@
          ~I~_when called with arguments ~2I~_~S.~:>"
         generic-function
         args))
+
+(defmethod invalid-qualifiers ((gf generic-function)
+                              combin
+                              method)
+  (let ((qualifiers (method-qualifiers method)))
+    (let ((why (cond
+                ((cdr qualifiers) "has too many qualifiers")
+                (t (aver (not (member (car qualifiers)
+                                      '(:around :before :after))))
+                   "has an invalid qualifier"))))
+      (invalid-method-error
+       method
+       "The method ~S on ~S ~A.~%~
+        Standard method combination requires all methods to have one~%~
+        of the single qualifiers :AROUND, :BEFORE and :AFTER or to~%~
+        have no qualifier at all."
+       method gf why))))