https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107015
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- In C++11 and later (when bitset<N>::reference doesn't use the debug mode iterator validity checks) the only benefit to __debug::bitset is that we check the argument to operator[] is in range, using __glibcxx_check_subscript. But we could just move that into std::bitset anyway. It's a cheap check that is enabled with _GLIBCXX_ASSERTIONS.
