Fixed log message using nonexistent variables as input

CHANGES

@@ -3,6 +3,7 @@
 
 - Dropped Python 2.5 and 3.1 support
 - Removed the deprecated "futures" top level package
+- Applied patch for issue 15015 (accessing an non-existing attribute)
 - Applied patch for issue 16284 (memory leak)
 
 

concurrent/futures/_base.py

@@ -490,8 +490,8 @@ class Future(object):
                 return True
             else:
                 LOGGER.critical('Future %s in unexpected state: %s',
-                                id(self.future),
-                                self.future._state)
+                                id(self),
+                                self._state)
                 raise RuntimeError('Future in unexpected state')
 
     def set_result(self, result):