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[Frouk]

Whenever you try to use __fastcall calling convention you'd mostly fail since it might not be properly defined, saw the _mingw.h use `__attribute__((fastcall))`, and it still gave an error, but after defining __fastcall macro as `__attribute__ ((__fastcall__))`, it thankfully worked

And there's no such thing as __thiscall convention, it highlights it but cannot be interpreted