As FreeBSD already used libc++ before it changed its ABI, we still use
the non-trivially copyable version of std::pair, which used to be
exposed via `_LIBCPP_TRIVIAL_PAIR_COPY_CTOR`, but more recently via
`_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR`.
Reviewed By: serge-sans-paille
Differential Revision: https://reviews.llvm.org/D99834
TrivialityTester<llvm::SmallString<8>, false, false>();
TrivialityTester<std::function<int()>, false, false>();
+#if !defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
TrivialityTester<std::pair<int, bool>, true, true>();
+#endif
TrivialityTester<llvm::unique_function<int()>, false, false>();
TrivialityTester<llvm::StringRef, true, true>();
TrivialityTester<llvm::ArrayRef<int>, true, true>();