code: @Test public void defaultSeparatorOutsideOfAVariable() throws ScanException {
    Tokenizer tokenizer=new Tokenizer("{a:-b}");
    Parser parser=new Parser(tokenizer.tokenize());
    Node node=parser.parse();
    dump(node);
    Node witness=new Node(Node.Type.LITERAL,"{");
    Node t=witness.next=new Node(Node.Type.LITERAL,"a");
    t.next=new Node(Node.Type.LITERAL,":-");
    t=t.next;
    t.next=new Node(Node.Type.LITERAL,"b");
    t=t.next;
    t.next=new Node(Node.Type.LITERAL,"}");
    assertEquals(witness,node);
  }
  