diff -r cf24f678adda -r 4455e5d4d59c contrib/synthrepo.py
--- a/contrib/synthrepo.py	Sun Jul 01 01:00:39 2018 +0530
+++ b/contrib/synthrepo.py	Tue May 22 15:02:52 2018 +0200
@@ -193,7 +193,8 @@
             if lastctx.rev() != nullrev:
                 timedelta = ctx.date()[0] - lastctx.date()[0]
                 interarrival[roundto(timedelta, 300)] += 1
-            diff = sum((d.splitlines() for d in ctx.diff(pctx, git=True)), [])
+            diff = sum((d.splitlines()
+                       for d in ctx.diff(pctx, opts={'git': True})), [])
             fileadds, diradds, fileremoves, filechanges = 0, 0, 0, 0
             for filename, mar, lineadd, lineremove, isbin in parsegitdiff(diff):
                 if isbin: