diff -r 07a5de79ec30 -r ac5057d5fc37 mercurial/verify.py
--- a/mercurial/verify.py	Mon Feb 01 15:41:43 2016 +0000
+++ b/mercurial/verify.py	Sun Jan 31 00:31:55 2016 -0800
@@ -149,6 +149,7 @@
         filenodes = self._verifymanifest(mflinkrevs)
 
         self._crosscheckfiles(mflinkrevs, filelinkrevs, filenodes)
+        del mflinkrevs
 
         totalfiles, filerevisions = self._verifyfiles(filenodes, filelinkrevs)
 
@@ -249,7 +250,6 @@
                 ui.progress(_('crosschecking'), count, total=total)
                 self.err(c, _("changeset refers to unknown manifest %s") %
                          short(m))
-            mflinkrevs = None # del is bad here due to scope issues
 
             for f in sorted(filelinkrevs):
                 count += 1