From: Richard M. Stallman <rms@gnu.org>
Date: Fri, 14 May 1993 03:57:45 +0000 (+0000)
Subject: (vc-revert-buffer1): Don't assume that compilation-error-list
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(vc-revert-buffer1): Don't assume that compilation-error-list
is a list; it might be t.
---

diff --git a/lisp/vc.el b/lisp/vc.el
index 2b7df01e99a..7f17c3cb007 100644
--- a/lisp/vc.el
+++ b/lisp/vc.el
@@ -289,7 +289,7 @@ the master name of FILE; this is appended to an optional list of FLAGS."
 						   compilation-old-error-list
 						   compilation-error-list))
 					  (buffer-error-marked-p nil))
-				      (while (and errors
+				      (while (and (consp errors)
 						  (not buffer-error-marked-p))
 					(and (markerp (cdr (car errors)))
 					     (eq buffer