message: add parentheses because this test is failing in my current CL
diff: @@ -1537,7 +1537,7 @@ class ControlDependenciesTest(test_util.TensorFlowTestCase):
  self.assertEqual(future.calls, 1)
  else:
  a = constant_op.constant(1.0)
  - b = future
  + b = future()
  with ops.control_dependencies([a, b]):
  c = constant_op.constant(3.0)
  self.assertEqual(future.calls, 1)
  