type S {
    value: i32,
    fn risky(self: ref<Self>) -> Void raises [Bad] {
        raise Bad
    }
}

interface Risky<T: Type> {
    fn risky(self: ref<T>) -> Void raises [Bad]
}

fn run<T: Risky<T>>(value: ref<T>) -> Void raises [Bad] {
    check T.risky(value)
}

pub fn main() -> Void {
}