import Collection;

fun f (x, y) {
  fun () {x+y}
}

var t = emptyMemo (),
      a = lookupMemo (t, "abc"),
      b = lookupMemo (t, [1, 2, 3, 4, "abc"]),
      c = lookupMemo (t, f (5, 6));

printf ("Cached: %d\n", lookupMemo (t, "abc") == a);
printf ("Cached: %d\n", lookupMemo (t, "abc") == a);
printf ("Cached: %d\n", lookupMemo (t, "abc") == a);

printf ("Cached: %d\n", lookupMemo (t, [1, 2, 3, 4, "abc"]) == b);
printf ("Cached: %d\n", lookupMemo (t, [1, 2, 3, 4, "abc"]) == b);
printf ("Cached: %d\n", lookupMemo (t, [1, 2, 3, 4, "abc"]) == b);

printf ("Cached: %d\n", lookupMemo (t, f (5, 6)) == c);
printf ("Cached: %d\n", lookupMemo (t, f (5, 6)) == c);
printf ("Cached: %d\n", lookupMemo (t, f (5, 6)) == c)