compilers/cw/tests/twice.c

/* ##answer: 12*/
int whammy(int a) {
  return a + 5;
}

function twice(function f) {
  int g(int x) { return f(f(x)); }
  return g;
}

int main() {
  doublewhammy = twice(whammy);

  return doublewhammy(2);
}