diff -r dd000a958364 -r a9454beb9dd8 mercurial/context.py
--- a/mercurial/context.py	Sat Nov 18 13:00:47 2017 +0800
+++ b/mercurial/context.py	Sat Nov 18 11:58:57 2017 +0800
@@ -819,6 +819,8 @@
         return self._changectx.phase()
     def phasestr(self):
         return self._changectx.phasestr()
+    def obsolete(self):
+        return self._changectx.obsolete()
     def manifest(self):
         return self._changectx.manifest()
     def changectx(self):