My interpreter is currently a bit... inconsistent.

recursion.toy

/* stack overflow, as expected
var counter = 0;

const recursion = () => {
  print ++counter;
  recursion();
};

recursion();
*/

/* process killed (handler didn't like it)
const recursion = (i) => {
  print i;
  recursion(i+1);
};

recursion(1);
*/

/* null reference?
const recursion = () => recursion();
recursion();
*/

/* NULL REFERENCE?
var counter = 0;

const recursion = () => {
  print ++counter;
  recursion();
};

recursion();
*/