code clean up

theano/gof/tests/test_destroyhandler.py

@@ -8,7 +8,7 @@ from theano.gof.op import Op
 from theano.gof.opt import *
 
 from theano.gof import destroyhandler
-from theano.gof.fg import FunctionGraph as Env, InconsistencyError
+from theano.gof.fg import FunctionGraph, InconsistencyError
 from theano.gof.toolbox import ReplaceValidate
 
 from copy import copy
@@ -91,9 +91,9 @@ def inputs():
     z = MyVariable('z')
     return x, y, z
 
-_Env = Env
+
 def Env(inputs, outputs, validate=True):
-    e = _Env(inputs, outputs)
+    e = FunctionGraph(inputs, outputs)
     e.attach_feature(destroyhandler.DestroyHandler())
     e.attach_feature(ReplaceValidate())
     if validate: