326         return self._state.keys()

   326         return self._state.keys()

   327 

   327 

   328     def mark(self, dfile, state):

   328     def mark(self, dfile, state):

   329         self._state[dfile][0] = state

   329         self._state[dfile][0] = state

   330         self._dirty = True

   330         self._dirty = True

   331 

   334 

   332     def unresolved(self):

   335     def unresolved(self):

   333         """Obtain the paths of unresolved files."""

   336         """Obtain the paths of unresolved files."""

   334 

   337 

   335         for f, entry in self._state.items():

   338         for f, entry in self._state.items():