Here's a revision to the cl-defgeneric Edebug spec, because I missed
this case:

(cl-defgeneric (setf foo) (v args))

which isn't documented but lets you create a generalized variable.

Also, the Edebug spec for cl-lambda-list isn't necessarily loaded and
isn't correct for cl-defgeneric anyway. Since there isn't any code for
Edebug to instrument inside the argument list, it can just be matched
with listp.

To reproduce these problems, start with emacs -Q and load
test/lisp/emacs-lisp/cl-generic-tests.el, then use edebug-all-defs and
eval-buffer.