module main

fn func(arg ?string, val &int) ?int {
    unsafe {
        *val = 2
    }
    return 2
}

fn test_main() {
    map1 := {
        'json': func
    }
    assert typeof(map1['json']).name == 'fn (?string, int) ?int'

    number := 0
    ret := map1['json']('hi', &number)
    assert number == ret?
    assert ret? == 2

    mut map2 := map[string]fn (?string, &int) ?int{}
    map2['json'] = func
    assert typeof(map2['json']).name == 'fn (?string, int) ?int'

    number2 := 0
    ret2 := map2['json']('', &number2)
    assert number2 == ret2?
    assert ret2? == 2
}