logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [242:282]:
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    end

    node_cache[:comment][start_index] = r0

    r0
  end

  def _nt_cs
    start_index = index
    if node_cache[:cs].has_key?(index)
      cached = node_cache[:cs][index]
      if cached
        node_cache[:cs][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    s0, i0 = [], index
    loop do
      i1 = index
      r2 = _nt_comment
      if r2
        r2 = SyntaxNode.new(input, (index-1)...index) if r2 == true
        r1 = r2
      else
        r3 = _nt_whitespace
        if r3
          r3 = SyntaxNode.new(input, (index-1)...index) if r3 == true
          r1 = r3
        else
          @index = i1
          r1 = nil
        end
      end
      if r1
        s0 << r1
      else
        break
      end
    end
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logstash-core/lib/logstash/config/grammar.rb [266:306]:
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    end

    node_cache[:comment][start_index] = r0

    r0
  end

  def _nt_cs
    start_index = index
    if node_cache[:cs].has_key?(index)
      cached = node_cache[:cs][index]
      if cached
        node_cache[:cs][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    s0, i0 = [], index
    loop do
      i1 = index
      r2 = _nt_comment
      if r2
        r2 = SyntaxNode.new(input, (index-1)...index) if r2 == true
        r1 = r2
      else
        r3 = _nt_whitespace
        if r3
          r3 = SyntaxNode.new(input, (index-1)...index) if r3 == true
          r1 = r3
        else
          @index = i1
          r1 = nil
        end
      end
      if r1
        s0 << r1
      else
        break
      end
    end
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