diff -r 6e3a6774d998 -r 52c7060b707a mercurial/changegroup.py
--- a/mercurial/changegroup.py	Wed Jun 21 14:42:04 2017 -0700
+++ b/mercurial/changegroup.py	Thu Jun 22 13:58:20 2017 -0700
@@ -60,25 +60,6 @@
     """return a changegroup chunk header (string) for a zero-length chunk"""
     return struct.pack(">l", 0)
 
-def combineresults(results):
-    """logic to combine 0 or more addchangegroup results into one"""
-    changedheads = 0
-    result = 1
-    for ret in results:
-        # If any changegroup result is 0, return 0
-        if ret == 0:
-            result = 0
-            break
-        if ret < -1:
-            changedheads += ret + 1
-        elif ret > 1:
-            changedheads += ret - 1
-    if changedheads > 0:
-        result = 1 + changedheads
-    elif changedheads < 0:
-        result = -1 + changedheads
-    return result
-
 def writechunks(ui, chunks, filename, vfs=None):
     """Write chunks to a file and return its filename.