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[Bug libstdc++/86272] [6/7/8/9 Regression] __gnu_debug::string uses undefined __glibcxx_check_insert_range2


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86272

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Debug Mode does not use __gnu_debug::string it just disables the explicit
instantation declarations in <string>, so that assertions in std::basic_string
are turned on.

To test __gnu_debug::string we really need a completely separate set of tests
that include <debug/string> and use it explicitly as __gnu_debug::string. Given
that it's probably never used by anybody (or they'd have noticed this bug)
doing that is not a priority.

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