[#D5E705CC1202FD256D389B27967A11C3F2F63B19]

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        <h2>Function variant_rule</h2>
        
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        <h3>Synopsis</h3>
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            <code>
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        <pre class="source-code cpp">
            template<
    class R0,
    class... Rn>
constexpr
variant_rule_t<R0, Rn...>
variant_rule(
    R0 const& r0,
    Rn const&... rn) noexcept;
        </pre>
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