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    class MyClass {
        virtual void function {}
        virtual ~MyClass() {}
    };
    class Derived {
        virtual void function {}
        virtual ~MyClass() {}
    };
 
    //is basically
 
    struct MyClass_functions {
        void function(MyClass this) {}
        destructor(MyClass this) {}
    }MCFI;
    class MyClass {
        MyClass_functions* vtable;
        MyClass() :vtable(&MCFI) {}
    };
    struct Derived_functions : public MyClass_functions {
        void function(MyClass this) {}
        destructor(MyClass this) {}
    }DFI;
    class Derived {
        Derived() :vtable(&DFI) {}
    };

prog.cpp:2:32: error: variable or field ‘function’ declared void
prog.cpp:2:32: error: expected ‘;’ at end of member declaration
prog.cpp:6:32: error: variable or field ‘function’ declared void
prog.cpp:6:32: error: expected ‘;’ at end of member declaration
prog.cpp:7:26: error: declaration of ‘~MyClass’ as member of ‘Derived’
prog.cpp:13:31: error: expected ‘,’ or ‘...’ before ‘this’
prog.cpp:14:28: error: expected ‘,’ or ‘...’ before ‘this’
prog.cpp:14:32: error: ISO C++ forbids declaration of ‘destructor’ with no type [-fpermissive]
prog.cpp: In member function ‘int MyClass_functions::destructor(MyClass)’:
prog.cpp:14:35: warning: no return statement in function returning non-void [-Wreturn-type]
prog.cpp: At global scope:
prog.cpp:16:11: error: redefinition of ‘class MyClass’
prog.cpp:1:11: error: previous definition of ‘class MyClass’
prog.cpp:21:31: error: expected ‘,’ or ‘...’ before ‘this’
prog.cpp:22:28: error: expected ‘,’ or ‘...’ before ‘this’
prog.cpp:22:32: error: ISO C++ forbids declaration of ‘destructor’ with no type [-fpermissive]
prog.cpp: In member function ‘int Derived_functions::destructor(MyClass)’:
prog.cpp:22:35: warning: no return statement in function returning non-void [-Wreturn-type]
prog.cpp: At global scope:
prog.cpp:24:11: error: redefinition of ‘class Derived’
prog.cpp:5:11: error: previous definition of ‘class Derived’

Standard output is empty