class Main {
   main() :Int { a@Int.b(a,a,a) };
   main() :Int { a.b(a,a,a) };
   main() :Int { a.b() };
   main(): Int {a(1,2,3,4)};
   ---------------------------------
   main() :Int { a@int.b(a,a,a) }; --incorrect int
   main() :Int { a@Int.b(a a a) }; --incorrect (expr)
   main() :Int { a.b(a,a,) }; --incorrect (expr)
   main() :Int { a.b(,a,) }; --incorrect (expr)
   main(): Int {A(1,2,3,4)}; --incorrect A
   main(): Int {a(1,2,3,)}; --incorrect (expr)
   main(): Int {a(,2,3,)}; --incorrect (expr)
};