logstash-core/lib/logstash/config/grammar.rb [2869:2892]:
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  def _nt_in_operator
    start_index = index
    if node_cache[:in_operator].has_key?(index)
      cached = node_cache[:in_operator][index]
      if cached
        node_cache[:in_operator][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    if (match_len = has_terminal?("in", false, index))
      r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
      @index += match_len
    else
      terminal_parse_failure('"in"')
      r0 = nil
    end

    node_cache[:in_operator][start_index] = r0

    r0
  end
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logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [2845:2868]:
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  def _nt_in_operator
    start_index = index
    if node_cache[:in_operator].has_key?(index)
      cached = node_cache[:in_operator][index]
      if cached
        node_cache[:in_operator][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    if (match_len = has_terminal?("in", false, index))
      r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
      @index += match_len
    else
      terminal_parse_failure('"in"')
      r0 = nil
    end

    node_cache[:in_operator][start_index] = r0

    r0
  end
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