[#FEFD73EAB578C47CDFA48BA9DFDC8E4953A67A21]

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        <h2>Class is_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 T>
struct is_rule<T, void_t<decltype(std::declval<system::result<typename T::value_type>&>() =
                std::declval<T const&>().parse(
                    std::declval<char const*&>(),
                    std::declval<char const*>()))>>
    : std::is_nothrow_copy_constructible<T>;
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