Compiler Error C3139

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'struct' : cannot export a UDT without members

You attempted to apply the export attribute to an empty UDT (user-defined type). For example:

// C3139.cpp
#include "unknwn.h"
[emitidl];
[module(name=xx)];

[export] struct MyStruct {   // C3139 empty type
};
int main(){}