Unattached methods have slot generic-function set to nil

src/CHANGELOG

@@ -116,6 +116,9 @@ ECL 0.9i
    defined, so that the compiler no longer issues warnings when they are
    referenced.
 
+ - The slot GENERIC-FUNCTION of a method is initially set to NIL instead of
+   left unbound.
+
 * Documentation:
 
  - The HTML manuals now use CSS for a more appealing look.

src/clos/kernel.lsp

@@ -119,7 +119,7 @@
 
 (eval-when (compile eval)
   (defparameter +standard-method-slots+
-    '((generic-function :initarg :generic-function
+    '((generic-function :initarg :generic-function :initform nil
        :accessor method-generic-function)
       (lambda-list :initarg :lambda-list
        :accessor method-lambda-list)