test.cpp
test.cpp(5) : error C2253: 'S<T>' : pure specifier or abstract override specifier only allowed on virtual function
        test.cpp(7) : see reference to class template instantiation 'S<T>' being compiled
test.cpp(5) : error C2065: 'default' : undeclared identifier
        test.cpp(13) : see reference to class template instantiation 'S<T>' being compiled
        with
        [
            T=int
        ]
test.cpp(5) : error C2253: 'S<int>' : pure specifier or abstract override specifier only allowed on virtual function
test.cpp(15) : error C2784: 'void foo(S<T> &,const S<T> &)' : could not deduce template argument for 'const S<T> &' from 'int'
        test.cpp(10) : see declaration of 'foo'