diff -r a26d33749bd8 -r 496ae1ea4698 mercurial/hbisect.py
--- a/mercurial/hbisect.py	Wed Apr 22 02:01:22 2009 +0200
+++ b/mercurial/hbisect.py	Wed Apr 22 02:01:22 2009 +0200
@@ -140,5 +140,5 @@
                 f.write("%s %s\n" % (kind, hex(node)))
         f.rename()
     finally:
-        del wlock
+        wlock.release()