--- a/mercurial/context.py	Sun Nov 19 04:11:21 2017 +0100
+++ b/mercurial/context.py	Sun Nov 19 13:18:54 2017 +0800
@@ -821,6 +821,8 @@
         return self._changectx.phasestr()
     def obsolete(self):
         return self._changectx.obsolete()
+    def instabilities(self):
+        return self._changectx.instabilities()
     def manifest(self):
         return self._changectx.manifest()
     def changectx(self):