got rid of UncomputableFeature

theano/compile/function_module.py

@@ -150,24 +150,6 @@ def std_fgraph(input_specs, output_specs, accept_inplace = False):
 
 std_fgraph.features = [gof.toolbox.PreserveNames]
 
-class UncomputableFeature(gof.Feature):
-    """A feature that ensures the graph never contains any
-    uncomputable nodes. This check must be made at compile time
-    rather than runtime in order to make sure that NaN nodes are
-    not optimized out. It must be done as a Feature so that
-    the fgraph will continually check that optimizations have
-    not introduce any uncomputable nodes."""
-
-    def on_attach(self, fgraph):
-        for node in fgraph.nodes:
-            return self.on_import(fgraph, node)
-
-    def on_import(self, fgraph, node):
-        gof.op.raise_if_uncomputable(node)
-
-std_fgraph.features.append(UncomputableFeature)
-
-
 class AliasedMemoryError(Exception):
     """Memory is aliased that should not be"""
     pass