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1namespace std {2template <typename _Tp, typename _Alloc = int>3struct vector {4 static void func() { vector *i, *j; i - j; }5};6 7struct bit_iterator { ~bit_iterator() {} };8 9inline void operator-(int __x, const bit_iterator &__y) {10}11 12template <typename _Alloc>13struct vector<bool, _Alloc> : bit_iterator {14 typedef bit_iterator iterator;15};16 17} // namespace std18