message: fix back variabe name
diff: @@ -673,7 +673,7 @@ class PartitionedVariableTest(test.TestCase):
  v0._set_save_slice_info(
  variables.Variable.SaveSliceInfo(v0.name, [2], [0], [1]))
  v1._set_save_slice_info(
  - variables.Variable.SaveSliceInfo(v1.name, [2], [1], [1]))
  + variables.Variable.SaveSliceInfo(v0.name, [2], [1], [1]))
  partitions = [2]
  variables.PartitionedVariable(
  