Overload set lut_chars::lut_chars

constexpr
lut_chars(char ch) noexcept;
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constexpr
lut_chars(const char* s) noexcept;
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template<
    class Pred,
    class = enable_if<detail::is_pred<Pred>::value && !std::is_base_of<lut_chars, Pred>::value>::type>
constexpr
lut_chars(const Pred& pred) noexcept;
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