fix casting in advanced subtensor.

theano/sandbox/cuda/basic_ops.py

@@ -2567,7 +2567,8 @@ class GpuAdvancedSubtensor1(tensor.AdvancedSubtensor1, GpuOp):
         # c code suppose it is int64
         if x.ndim in [2, 3] and ilist_.dtype in [
             'int8', 'int16', 'int32', 'uint8', 'uint16', 'uint32']:
-            ilist_ = ilist_.cast('int64')
+            ilist_ = tensor.cast(ilist_, 'int64')
+
         bcast = (ilist_.broadcastable[0],) + x_.broadcastable[1:]
         return Apply(self, [x_, ilist_],
                      [CudaNdarrayType(dtype=x.dtype,