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A bunch of unordered containers tests call library functions but don't directly include the corresponding header files: - fabs() (defined in <cmath> which is not included); - is_permutation() (defined in <algorithm> which is not included); - next() (defined in <iterator> which is not included). - As a result, these tests won't compile against some conformant libraries. Reviewed as https://reviews.llvm.org/D54643. Thanks to Andrey Maksimov for the patch. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@347085 91177308-0d34-0410-b5e6-96231b3b80d8