[#26FAA8F2D2242274E5EC299CBAE00123C28AB75E]

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        <h2><a href="#">optional_rule_t</a>::
value_type</h2>
        
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        <h3>Synopsis</h3>
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            <code>
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        <pre class="source-code cpp">
            using value_type = optional<Rule::value_type>;
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