message: unusued ==> unused
diff: @@ -183,7 +183,7 @@ def _copy_non_source(op, graph, op_map):
  # a placeholder for now and return information about the required post-hoc
  # mutation.
  copied_input = array_ops.placeholder(
  - name="unusued_control_flow_input",
  + name="unused_control_flow_input",
  shape=original_input.shape,
  dtype=original_input.dtype)
  input_mutations.append(
  