[#1162A5A19F945B753FB052E823CF7C39C343DC1F]

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        <h2>Friend not_empty_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 R_>
friend
constexpr
not_empty_rule_t<R_>
not_empty_rule(R_ const& r);
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