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Niels Lohmann
288a69b1d2
The ADL to_json overload for std::basic_string<char8_t, ...> was only ever reached indirectly, via std::filesystem::path::u8string(). Add a test that constructs a json value directly from a std::u8string, gated the same way as the overload itself (include/nlohmann/detail/conversions/to_json.hpp): behind both the std::filesystem::path feature guard and __cpp_lib_char8_t, since the overload only exists when both are satisfied. Signed-off-by: Niels Lohmann <mail@nlohmann.me>