--- a/mercurial/merge.py	Thu Oct 15 00:49:07 2015 -0700
+++ b/mercurial/merge.py	Thu Oct 15 00:57:56 2015 -0700
@@ -329,6 +329,9 @@
         self._state[dfile][0] = state
         self._dirty = True
 
+    def mdstate(self):
+        return self._mdstate
+
     def unresolved(self):
         """Obtain the paths of unresolved files."""