*input = {oper, 0};
  return true;
}

// Copies `src_graph` into `dst_graph`. Any node in `src_graph` with input
// `src_inputs[i]` will have that input replaced with `dst_inputs[i]`.  `prefix`
// will be prepended to copied node names. `control_deps` are nodes in
// `dst_graph` that the copied `src_graph` nodes will have control dependencies
// on. `return_nodes` are nodes in `src_graph`, and the new corresponding nodes

trying to box her own ears for having cheated herself in a game
of croquet she was playing against herself, for this curious
child was very fond of pretending to be two people.  `But it's no
use now,' thought poor Alice, `to pretend to be two people!  Why,
there's hardly enough of me left to make ONE respectable
person!'

  Soon her eye fell on a little glass box that was lying under
the table:  she opened it, and found in it a very small cake, on

trying to box her own ears for having cheated herself in a game
of croquet she was playing against herself, for this curious
child was very fond of pretending to be two people.  `But it's no
use now,' thought poor Alice, `to pretend to be two people!  Why,
there's hardly enough of me left to make ONE respectable
person!'

  Soon her eye fell on a little glass box that was lying under
the table:  she opened it, and found in it a very small cake, on