class Main{
   main():Int { isvoid a };
   main():Int { {isvoid a; isvoid a;} };
   ----------------------------------------
   main():Int { a + a + a +a };
   main():Int { a * a + a - a / a};
   main():Int { ~a<-a+1};
   main():Int { ~false};
   main():Int { ~a<a+1};
   main():Int { not not a};
   main():Int { (5)};
   main():Int { (5+a*89)};
   main():Int { { 45; "hello"; true; false;} };
};