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Remarks: This function shall not participate in overload resolution unless `is_same_v<decay_t<T>, variant>` is false, unless `decay_t<T>` is neither a specialization of `in_place_type_t` nor a specialization of `in_place_index_t`, unless `is_constructible_v<Tj, T>` is true, and unless the expression `FUN(std::forward<T>(t))` (with `FUN` being the above-mentioned set of imaginary functions) is well formed. Depends on D34111. Reviewers: EricWF, K-ballo Reviewed By: EricWF Subscribers: fhahn Differential Revision: https://reviews.llvm.org/D34112 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@305668 91177308-0d34-0410-b5e6-96231b3b80d8