logstash-core/lib/logstash/config/config_ast.rb [563:588]:
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class Treetop::Runtime::SyntaxNode
  def _inspect(indent = "")
    em = extension_modules
    interesting_methods = methods - [em.last ? em.last.methods : nil] - self.class.instance_methods
    im = interesting_methods.size > 0 ? " (#{interesting_methods.join(",")})" : ""
    tv = text_value
    tv = "...#{tv[-20..-1]}" if tv.size > 20

    indent +
    self.class.to_s.sub(/.*:/, '') +
      em.map {|m| "+" + m.to_s.sub(/.*:/, '')} * "" +
      " offset=#{interval.first}" +
      ", #{tv.inspect}" +
      im +
      (elements && elements.size > 0 ?
        ":" +
          (elements.select { |e| !e.is_a?(LogStash::Config::AST::Whitespace) && e.elements && e.elements.size > 0 } || []).map {|e|
      begin
        "\n" + e.inspect(indent + "  ")
      rescue  # Defend against inspect not taking a parameter
        "\n" + indent + " " + e.inspect
      end
          }.join("") :
        ""
      )
  end
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logstash-core/lib/logstash/compiler/treetop_monkeypatches.rb [86:111]:
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  # any Whitespace or SyntaxNodes with no children.
  def _inspect(indent = "")
    em = extension_modules
    interesting_methods = methods - [em.last ? em.last.methods : nil] - self.class.instance_methods
    im = interesting_methods.size > 0 ? " (#{interesting_methods.join(",")})" : ""
    tv = text_value
    tv = "...#{tv[-20..-1]}" if tv.size > 20

    indent +
    self.class.to_s.sub(/.*:/, '') +
      em.map {|m| "+" + m.to_s.sub(/.*:/, '')} * "" +
      " offset=#{interval.first}" +
      ", #{tv.inspect}" +
      im +
      (elements && elements.size > 0 ?
        ":" +
          (elements.select { |e| !e.is_a?(LogStash::Config::AST::Whitespace) && e.elements && e.elements.size > 0 } || []).map {|e|
      begin
        "\n" + e.inspect(indent + "  ")
      rescue  # Defend against inspect not taking a parameter
        "\n" + indent + " " + e.inspect
      end
          }.join("") :
        ""
      )
  end
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