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r #12967 make none_t constructor constexpr
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@@ -29,7 +29,7 @@ class none_t {};
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struct none_t
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{
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struct init_tag{};
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explicit none_t(init_tag){} // to disable default constructor
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explicit constexpr none_t(init_tag){} // to disable default constructor
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};
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#endif // old implementation workarounds
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