a.ooc

A: cover {
}

AA: cover from A {
}

AAA: cover from AA extends AA {
    hello: func {
        "hello" println()
    }
}

extend AA {
    huhu: func {
        "huhu" println()
    }
}

main: func {
    a: A
    a as AA huhu()
    a as AAA huhu() // <- fails
}