make a check more strict. This is usefull as AdvancedSubtensor give better message error.

theano/tensor/basic.py

@@ -1169,7 +1169,9 @@ class _tensor_py_operators:
                 break
 
         if advanced:
-            if len(args) == 1:
+            if len(args) == 1 and isinstance(args[0],
+                                             (list, TensorVariable,
+                                              theano.tensor.sharedvar.TensorSharedVariable)):
                 return advanced_subtensor1(self, *args)
             else:
                 return AdvancedSubtensor(args)(self, *args)