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
Summary: This was voted into C++20 in San Diego. Note that there was a revision D0318R2 which did include unwrap_reference_t, but we mistakingly voted P0318R1 into the C++20 Working Draft (which does not include unwrap_reference_t). This patch implements D0318R2, which is what we'll end up with in the Working Draft once this mistake has been fixed. Reviewers: EricWF, mclow.lists Subscribers: christof, dexonsmith, libcxx-commits Differential Revision: https://reviews.llvm.org/D54485 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@348138 91177308-0d34-0410-b5e6-96231b3b80d8