--- a/tests/test-context.py	Tue Apr 03 08:55:49 2018 -0700
+++ b/tests/test-context.py	Tue Apr 03 09:12:15 2018 -0700
@@ -52,7 +52,7 @@
         data += 'bar\n'
     return context.memfilectx(repo, memctx, f, data, 'l' in flags, 'x' in flags)
 
-ctxa = repo.changectx(0)
+ctxa = repo[0]
 ctxb = context.memctx(repo, [ctxa.node(), None], "test diff", ["foo"],
                       getfilectx, ctxa.user(), ctxa.date())