diff -r b333ca94403d -r c1f5ef76d1c2 mercurial/crecord.py
--- a/mercurial/crecord.py	Sun Apr 26 18:13:48 2015 +0900
+++ b/mercurial/crecord.py	Wed May 27 15:49:24 2015 -0700
@@ -425,7 +425,7 @@
     def __repr__(self):
         return '<hunk %r@%d>' % (self.filename(), self.fromline)
 
-def filterpatch(ui, chunks, chunkselector):
+def filterpatch(ui, chunks, chunkselector, operation=None):
     """interactively filter patch chunks into applied-only chunks"""
 
     chunks = list(chunks)