input.mit.js

p = {x:0; y:0;};
im = fun(x y){ 
   if(x==p.x & y==p.y){
      return "x";
   }
   return " ";
};
i = 0;
while(i < 30){
 
   consolePrint(im, 30, 30);
   p.x = i;
   p.y = i;
   i = i+1;
}

output.txt

Program
-------
  Block {
    Assignment
      p = Record
        x : 0
        y : 0
      ;
    Assignment
      im = Function(x, y)
        Block {
          IfStatement
            If[((x) == (p.x)) & ((y) == (p.y))] {
              Block {
                Return
                  "x"
              }
            }
          Return
            " "
        }
      ;
    Assignment
      i = 0;
    WhileLoop
      While[(i) < (30)] {
        Block {
          Call[consolePrint]
            im
            30
            30
          Assignment
            p.x = i;
          Assignment
            p.y = i;
          Assignment
            i = (i) + (1);
        }
      }
  }