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10 #if !defined(__cplusplus) || (defined(_MSC_VER) && !_NATIVE_WCHAR_T_DEFINED)
16 #if !defined(_WCHAR_T) || \
17 (__has_feature(modules) && !__building_module(_Builtin_stddef))
20 #ifdef _MSC_EXTENSIONS
21 #define _WCHAR_T_DEFINED