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This functions are indirectly called from flat_ containers operations (from preconditions check of lower_bound, upper_bound, ...) that were made constexpr by r16-6026-gbf9dd44a97400e, leading to test with in _GLIBCXX_DEBUG mode. For __can_advance we uncoditionally return true in constant evaluation, similary to __valid_range. The constexpr iterator will detect comparision of iterator to different ranges. libstdc++-v3/ChangeLog: * include/debug/helper_functions.h (__gnu_debug::__can_advance): Declare as _GLIBCXX20_CONSTEXPR. * include/debug/safe_iterator.h (__gnu_debug::__can_advance): Define as _GLIBCXX20_CONSTEXPR, and return true for constexpr evaluation. (__gnu_debug::__base): Define as _GLIBCXX20_CONSTEXPR.