fix tests in FAST_COMPILE mode.

theano/tensor/tests/test_opt.py

@@ -3317,12 +3317,16 @@ class T_local_sum(unittest.TestCase):
         optimizer.optimize(g)
         order = g.toposort()
         assert 1 == sum([isinstance(node.op, T.CAReduce) for node in order])
-        op = order[-2].op
+        if config.mode == 'FAST_COMPILE':
+            node = order[-1]
+        else:
+            node = order[-2]
+        op = node.op
         assert isinstance(op, T.CAReduce)
         # -- the leading broadcastable dimension has been dropped
         #   by the local_sum_broadcastable optimization
         #   now summation is over the original x's dimension 1.
-        assert order[-2].inputs[0].ndim == 2, order[-2]
+        assert node.inputs[0].ndim == 2, node
         assert op.axis == (0,), op.axis
 
     def test_local_sum_broadcast_some_1(self):