1 files changed, 8 insertions, 2 deletions

diff --git a/lisp/emacs-lisp/testcover.el b/lisp/emacs-lisp/testcover.el
index 433ad38a147..17891fd6096 100644
--- a/lisp/emacs-lisp/testcover.el
+++ b/lisp/emacs-lisp/testcover.el
@@ -463,7 +463,10 @@ binding `testcover-vector' to the code-coverage vector for TESTCOVER-SYM
   (cond
    ((eq (aref testcover-vector idx) 'unknown)
     (aset testcover-vector idx val))
-   ((not (equal (aref testcover-vector idx) val))
+   ((not (condition-case ()
+             (equal (aref testcover-vector idx) val)
+           ;; TODO: Actually check circular lists for equality.
+           (circular-list nil)))
     (aset testcover-vector idx 'ok-coverage)))
   val)
 
@@ -475,7 +478,10 @@ same value during coverage testing."
    ((eq (aref testcover-vector idx) '1value)
     (aset testcover-vector idx (cons '1value val)))
    ((not (and (eq (car-safe (aref testcover-vector idx)) '1value)
-              (equal (cdr (aref testcover-vector idx)) val)))
+              (condition-case ()
+                  (equal (cdr (aref testcover-vector idx)) val)
+                ;; TODO: Actually check circular lists for equality.
+                (circular-list nil))))
     (error "Value of form marked with `1value' does vary: %s" val)))
   val)