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map::operator[] should be nodiscard
Lately libc++ has been adding the C++17 [[nodiscard]] attribute aggressively to every header. (I’m not sure why this month, but my guess is that libc++ just dropped support for some old compiler such that all their supported compilers now permit the attribute even in C++11 mode.) libc++ is following the trail that Microsoft STL has blazed since VS 15.6 in late 2017.
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