logstash-core/lib/logstash/config/grammar.rb [3160:3177]:
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  def _nt_method
    start_index = index
    if node_cache[:method].has_key?(index)
      cached = node_cache[:method][index]
      if cached
        node_cache[:method][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    r0 = _nt_bareword

    node_cache[:method][start_index] = r0

    r0
  end
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logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [3136:3153]:
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  def _nt_method
    start_index = index
    if node_cache[:method].has_key?(index)
      cached = node_cache[:method][index]
      if cached
        node_cache[:method][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    r0 = _nt_bareword

    node_cache[:method][start_index] = r0

    r0
  end
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