data = Psych.parser.parse("---\nfoo: \n  bar: baz\n  qux: quux")
#<Psych::Parser:0x007fd84089fa60
  @handler=#<Psych::TreeBuilder:0x007fd84089fab0
  @stack=[],
  @last=nil,
  @root=#<Psych::Nodes::Stream:0x007fd84089f9e8 @children=[
    #<Psych::Nodes::Document:0x007fd84089f948 @children=[
      #<Psych::Nodes::Mapping:0x007fd84089f8f8 @children=[
      #<Psych::Nodes::Scalar:0x007fd84089f880 @value="foo", @anchor=nil, @tag=nil, @plain=true, @quoted=false, @style=1>,
      #<Psych::Nodes::Mapping:0x007fd84089f858 @children=[
        #<Psych::Nodes::Scalar:0x007fd84089f7e0 @value="bar", @anchor=nil, @tag=nil, @plain=true, @quoted=false, @style=1>,
        #<Psych::Nodes::Scalar:0x007fd84089f790 @value="baz", @anchor=nil, @tag=nil, @plain=true, @quoted=false, @style=1>,
        #<Psych::Nodes::Scalar:0x007fd84089f740 @value="qux", @anchor=nil, @tag=nil, @plain=true, @quoted=false, @style=1>,
        #<Psych::Nodes::Scalar:0x007fd84089f6f0 @value="quux", @anchor=nil, @tag=nil, @plain=true, @quoted=false, @style=1>
      ], @anchor=nil, @tag=nil, @implicit=true, @style=1>], @anchor=nil, @tag=nil, @implicit=true, @style=1>
    ], @version=[], @tag_directives=[], @implicit=false, @implicit_end=true>
  ], @encoding=1>>, @external_encoding=0>