--- a/mercurial/patch.py	Mon Jul 02 10:59:16 2007 -0700
+++ b/mercurial/patch.py	Mon Jul 02 13:26:12 2007 -0700
@@ -91,6 +91,7 @@
                         # drop earlier commit message content
                         cfp.seek(0)
                         cfp.truncate()
+                        subject = None
                     elif hgpatch:
                         if line.startswith('# User '):
                             user = line[7:]