code: func (t *StandardTokenizerImpl) zzScanError(errorCode int) {
  	var msg string
  	if errorCode >= 0 && errorCode < len(ZZ_ERROR_MSG) {
  		msg = ZZ_ERROR_MSG[errorCode]
  	} else {
  		msg = ZZ_ERROR_MSG[ZZ_UNKNOWN_ERROR]
  	}
  	panic(msg)
  }
docs: /*
  Reports an error that occurred while scanning.
  
  In a wellcormed scanner (no or only correct usage of yypushack(int)
  and a match-all fallback rule) this method will only be called with
  things that "can't possibly happen". If thismethod is called,
  something is seriously wrong (e.g. a JFlex bug producing a faulty
  scanner etc.).
  
  Usual syntax/scanner level error handling should be done in error
  fallback rules.
  */