compilers/tac/tests/twice.c

/* ##answer: 12*/
function twice(function f) {
  int g(int x) { return f(f(x)); }
  return g;
}

int main() {
  int whammy(int a) {
    return a + 5;
  }
  function doublewhammy = twice(whammy);

  return doublewhammy(2);
}