class Main{
   main():Int { isvoid a };
   main():Int { {isvoid a; isvoid a;} };
   ----------------------------------------
   main():Int { isvoid Int };  --wrong second Int 
   main():Int { isvid a };  --wrong isvoid
   main():Int { isvoid a a}; --wrong a
   --**************************************
   main():Int { a + a + a +a };
   ---------------------------------------
   main():Int { a + a  a +a }; --missing operator
   main():Int {  + a + a +a }; --missing operand
   main():Int { a + a + a + }; --missing operand
   main():Int { a + A + a + }; --wrong A
   --**************************************
   main():Int { a * a + a - a / a};
   main():Int { a * B + a - a / a}; --wrong B
   --**************************************
   main():Int { ~a<-a+1};
   main():Int { ~false};
   main():Int { ~a<a+1};
   --**************************************
   main():Int { not not a};
   main():Int { notnot a}; --wrong notnot
   --**************************************
   main():Int { (5)};
   main():Int { (5+a*89)};
   main():Int { (5+a*89}; --missing )
   main():Int { 5+a*89)}; --incorrect )
   --**************************************
   main():Int { {a < a; a <= b; c = d; } };
   main():Int { {a > a; a <= b; c == d; } }; --incorrect >, ==
   main():Int { {a < a <= b ; a <= b <= c; c == d == e; } }; 
	--incorrect; can't have multiple relational operators
   main():Int { {a << a; a <= b; c == d; } }; --incorrect <<, ==
   --**************************************
   main():Int { { 45; "hello"; true; false;} };
   main():Int { { 45; "hello"; tre; flse;} };
};