diff --git a/mercurial/context.py b/mercurial/context.py
--- a/mercurial/context.py
+++ b/mercurial/context.py
@@ -50,6 +50,9 @@ class basectx(object):
         except AttributeError:
             return False
 
+    def __ne__(self, other):
+        return not (self == other)
+
     def rev(self):
         return self._rev
     def node(self):
@@ -168,9 +171,6 @@ class changectx(basectx):
         except AttributeError:
             return id(self)
 
-    def __ne__(self, other):
-        return not (self == other)
-
     def __nonzero__(self):
         return self._rev != nullrev