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Compiler Error C3733

'event': improper syntax for specifying a COM event; did you forget '__interface'?

The wrong syntax was used for a COM event. To fix this error, change the event type or correct the syntax to comply with the COM event rules.

The following sample generates C3733:

#include "atlbase.h"
#include "atlcom.h"

[coclass, event_source(com), // change 'com' to 'native' to resolve
class A
   __event void func();   // C3733

int main()