diff --git a/lisp/progmodes/peg.el b/lisp/progmodes/peg.el
index 4518d82cc37..15372555ab5 100644
--- a/lisp/progmodes/peg.el
+++ b/lisp/progmodes/peg.el
@@ -897,8 +897,8 @@ input.  PATH is the list of rules that we have visited so far."
 (defun peg-merge-error (exp merged)
   (apply #'peg--merge-error merged exp))
 
-(cl-defgeneric peg--merge-error (_merged head &rest args)
-  (error "No merge-error method for: %S" (cons head args)))
+(cl-defgeneric peg--merge-error (merged head &rest args)
+  (cl-adjoin (cons head args) merged :test #'equal))
 
 (cl-defmethod peg--merge-error (merged (_ (eql or)) e1 e2)
   (peg-merge-error e2 (peg-merge-error e1 merged)))
@@ -911,36 +911,24 @@ input.  PATH is the list of rules that we have visited so far."
   ;;(add-to-list 'merged str)
   (cl-adjoin str merged :test #'equal))
 
-(cl-defmethod peg--merge-error (merged (_ (eql call)) rule)
-  ;; (add-to-list 'merged rule)
-  (cl-adjoin rule merged :test #'equal))
+(cl-defmethod peg--merge-error (merged (_ (eql call)) rule &rest args)
+  (cl-adjoin (if args (cons rule args) rule) merged :test #'equal))
 
 (cl-defmethod peg--merge-error (merged (_ (eql char)) char)
-  ;; (add-to-list 'merged (string char))
   (cl-adjoin (string char) merged :test #'equal))
 
 (cl-defmethod peg--merge-error (merged (_ (eql set)) r c k)
-  ;; (add-to-list 'merged (peg-make-charset-regexp r c k))
   (cl-adjoin (peg-make-charset-regexp r c k) merged :test #'equal))
 
 (cl-defmethod peg--merge-error (merged (_ (eql range)) from to)
-  ;; (add-to-list 'merged (format "[%c-%c]" from to))
   (cl-adjoin (format "[%c-%c]" from to) merged :test #'equal))
 
 (cl-defmethod peg--merge-error (merged (_ (eql *)) exp)
   (peg-merge-error exp merged))
 
-(cl-defmethod peg--merge-error (merged (_ (eql any)))
-  ;; (add-to-list 'merged '(any))
-  (cl-adjoin '(any) merged :test #'equal))
-
-(cl-defmethod peg--merge-error (merged (_ (eql not)) x)
-  ;; (add-to-list 'merged `(not ,x))
-  (cl-adjoin `(not ,x) merged :test #'equal))
-
 (cl-defmethod peg--merge-error (merged (_ (eql action)) _action) merged)
 (cl-defmethod peg--merge-error (merged (_ (eql guard)) e)
-  (if (eq e t) merged (cl-adjoin `(guard ,e) merged :test #'equal)))
+  (if (eq e t) merged (cl-call-next-method)))
 
 (provide 'peg)
 (require 'peg)