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// { dg-options "-std=gnu++20" }
// { dg-do compile { target c++20 } }
#include <format>
struct O {
using difference_type = std::ranges::__detail::__max_diff_type;
O& operator=(const char&);
O& operator*();
O& operator++();
O& operator++(int);
};
auto str = std::format_to_n(O{}, 4, "{}", " "); // PR libstdc++/107871
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