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The unordered_set and unordered_multiset iterators are specified in the standard as follows: using iterator = implementation-defined; // see [container.requirements] using const_iterator = implementation-defined; // see [container.requirements] using local_iterator = implementation-defined; // see [container.requirements] using const_local_iterator = implementation-defined; // see [container.requirements] The pairs iterator/const_iterator and local_iterator/const_local_iterator are not required to be the same. The reasonable requirement would be that iterator can convert to const_iterator and local_iterator can convert to const_local_iterator. This patch weakens the check and makes the test more portable. Reviewed as https://reviews.llvm.org/D56493. Thanks to Andrey Maksimov for the patch. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@352083 91177308-0d34-0410-b5e6-96231b3b80d8