input.txt

   1 var x = 5 == 5;
   2 var y = x;
   3 fun(x){
   4         var x = 5;
   5         6;
   6         if(true){5;}else{5;}
   7         '\t';
   8 return 5;
   9 f();
  10 f(x); f(1, 2, []);
  11 y = 5+x.fst.snd;
  12 }