@Test(expected = RuntimeRecognitionException.class)
public void testLetInWrongPlace() throws RecognitionException {

  String badsink = "{ deco1 => { let letvar := test in deco2 =>   [ < sink1 ? sink2> , sink3, { deco3 => sink4}  ]  } } ";
  CommonTree parse = FlumeBuilder.parseSink(badsink);
  LOG.info(parse.toStringTree());
}