--- a/tests/autodiff.py	Sat Mar 31 23:58:08 2018 -0400
+++ b/tests/autodiff.py	Sat Mar 31 23:37:25 2018 -0700
@@ -40,7 +40,7 @@
     else:
         raise error.Abort(b'--git must be yes, no or auto')
 
-    node1, node2 = scmutil.revpair(repo, [])
+    node1, node2 = scmutil.revpairnodes(repo, [])
     m = scmutil.match(repo[node2], pats, opts)
     it = patch.diff(repo, node1, node2, match=m, opts=diffopts,
                     losedatafn=losedatafn)