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This patch works around variant test failures which are new to GCC 8. GCC 8 either doesn't perform SFINAE in lexical order, or it doesn't halt after encountering the first failure. This causes hard error to occur instead of substitution failure. See gcc.gnu.org/PR78489 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@328261 91177308-0d34-0410-b5e6-96231b3b80d8