diff -r 998fc8f62539 -r e617f2e99e61 mercurial/patch.py
--- a/mercurial/patch.py	Wed Jan 28 20:06:59 2009 -0600
+++ b/mercurial/patch.py	Thu Feb 12 12:35:48 2009 +0100
@@ -1201,9 +1201,6 @@
     if node1 is None, use first dirstate parent instead.
     if node2 is None, compare node1 with working directory.'''
 
-    if not match:
-        match = cmdutil.matchall(repo)
-
     if opts is None:
         opts = mdiff.defaultopts