diff --git a/lisp/emacs-lisp/cl-extra.el b/lisp/emacs-lisp/cl-extra.el
index 78484fcfa3f..7d530deae5b 100644
--- a/lisp/emacs-lisp/cl-extra.el
+++ b/lisp/emacs-lisp/cl-extra.el
@@ -482,7 +482,7 @@ Optional second arg STATE is a random-state object."
 If STATE is t, return a new state object seeded from the time of day."
   (unless state (setq state cl--random-state))
   (if (cl-random-state-p state)
-      (copy-tree state t)
+      (copy-sequence state)
     (cl--make-random-state (if (integerp state) state (cl--random-time)))))
 
 ;; Implementation limits.
diff --git a/lisp/progmodes/cc-fonts.el b/lisp/progmodes/cc-fonts.el
index 2e85924f7be..e91e54df9ca 100644
--- a/lisp/progmodes/cc-fonts.el
+++ b/lisp/progmodes/cc-fonts.el
@@ -1255,8 +1255,8 @@ casts and declarations are fontified.  Used on level 2 and higher."
 		(save-excursion
 		  (goto-char match-pos)
 		  (while
-		      (progn (c-backward-token-2)
-			     (eq (char-after) ?\()))
+		      (and (zerop (c-backward-token-2))
+			   (eq (char-after) ?\()))
 		  (looking-at c-arithmetic-op-regexp)))
 	   (cons nil nil))
 	  ;; In a C++ member initialization list.
diff --git a/test/lisp/emacs-lisp/cl-extra-tests.el b/test/lisp/emacs-lisp/cl-extra-tests.el
index baad8eb8e67..fe59703530f 100644
--- a/test/lisp/emacs-lisp/cl-extra-tests.el
+++ b/test/lisp/emacs-lisp/cl-extra-tests.el
@@ -94,4 +94,9 @@
     (should (equal (list lst3 (cdr lst3) (cddr lst3))
                    (cl-maplist fn3 lst lst2 lst3)))))
 
+(ert-deftest cl-extra-test-cl-make-random-state ()
+  (let ((s (cl-make-random-state)))
+    ;; Test for Bug#33731.
+    (should-not (eq s (cl-make-random-state s)))))
+
 ;;; cl-extra-tests.el ends here