fixed feature class versus instance issue

theano/compile/debugmode.py

@@ -686,7 +686,7 @@ def _optcheck_fgraph(input_specs, output_specs, accept_inplace=False):
                                                    and fgraph.destroyers(input)))))
 
     for feature in std_fgraph.features:
-        fgraph.extend(feature)
+        fgraph.extend(feature())
 
     return fgraph, map(SymbolicOutput, updates), equivalence_tracker
 

theano/compile/function_module.py

@@ -148,7 +148,7 @@ def std_fgraph(input_specs, output_specs, accept_inplace = False):
     return fgraph, map(SymbolicOutput, updates)
 
 
-std_fgraph.features = [gof.toolbox.PreserveNames()]
+std_fgraph.features = [gof.toolbox.PreserveNames]
 
 class UncomputableFeature(gof.Feature):
     """A feature that ensures the graph never contains any
@@ -165,7 +165,7 @@ class UncomputableFeature(gof.Feature):
     def on_import(self, fgraph, node):
         gof.op.raise_if_uncomputable(node)
 
-std_fgraph.features.append(UncomputableFeature())
+std_fgraph.features.append(UncomputableFeature)
 
 
 class AliasedMemoryError(Exception):