fn compute(op: fn(I32, I32) -> I32, a: I32, b: I32) -> I32 {
    return op(a, b);
}

test "test_lambda_arrow" {
    let doubler = x -> x * 2;
    let res1 = doubler(5);
    "doubler(5) = {res1}";
    if res1 != 10 { exit(1); }

    let add = (x, y) -> x + y;
    let res2 = add(10, 20);
    "add(10, 20) = {res2}";
    if res2 != 30 { exit(1); }
    
    let res3 = compute((a, b) -> a * b, 3, 4);
    "compute((a, b) -> a * b, 3, 4) = {res3}";
    if res3 != 12 { exit(1); }
}

test "lambda_inference_repro" {
    let dble = x -> x * 2.0;
    let res = dble(9.0);
    if res != 18.0 {
        exit(1);
    }
}