Dumping nodes to stdout with Nodewrap

  $ cat test.rb
  def foo
    1+1
  end

  $ ruby -rnwdump test.rb
  NODE_NEWLINE at test.rb:1
  |-nth = 1
  +-next = NODE_DEFN at test.rb:1
    |-defn = NODE_SCOPE at test.rb:3
    | |-rval = false
    | |-tbl = nil
    | +-next = NODE_BLOCK at test.rb:1
    |   |-next = NODE_BLOCK at test.rb:3
    |   | |-next = false
    |   | +-head = NODE_NEWLINE at test.rb:2
    |   |   |-nth = 2
    |   |   +-next = NODE_CALL at test.rb:2
    |   |     |-recv = NODE_LIT at test.rb:2
    |   |     | +-lit = 1
    |   |     |-args = NODE_ARRAY at test.rb:2
    |   |     | |-alen = 1
    |   |     | |-head = NODE_LIT at test.rb:2
    |   |     | | +-lit = 1
    |   |     | +-next = false
    |   |     +-mid = :+
    |   +-head = NODE_ARGS at test.rb:1
    |     |-cnt = 0
    |     |-rest = -1
    |     +-opt = false
    |-mid = :foo
    +-noex = PRIVATE