code: static boolean isBreakStructure(Node n, boolean labeled) {
      switch (n.getToken()) {
        case FOR:
        case FOR_IN:
        case FOR_OF:
        case FOR_AWAIT_OF:
        case DO:
        case WHILE:
        case SWITCH:
          return true;
        case BLOCK:
        case ROOT:
        case IF:
        case TRY:
          return labeled;
        default:
          return false;
      }
    }
docs: Determines whether the given node can be terminated with a BREAK node.