logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [3499:3535]:
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          else
            @index = i0
            r0 = nil
          end
        end
      end
    end

    node_cache[:boolean_operator][start_index] = r0

    r0
  end

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

    s0, i0 = [], index
    loop do
      r1 = _nt_selector_element
      if r1
        s0 << r1
      else
        break
      end
    end
    if s0.empty?
      @index = i0
      r0 = nil
    else
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logstash-core/lib/logstash/config/grammar.rb [3523:3559]:
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          else
            @index = i0
            r0 = nil
          end
        end
      end
    end

    node_cache[:boolean_operator][start_index] = r0

    r0
  end

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

    s0, i0 = [], index
    loop do
      r1 = _nt_selector_element
      if r1
        s0 << r1
      else
        break
      end
    end
    if s0.empty?
      @index = i0
      r0 = nil
    else
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