futures_util/stream/futures_unordered/
abort.rs

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pub(super) fn abort(s: &str) -> ! {
    struct DoublePanic;

    impl Drop for DoublePanic {
        fn drop(&mut self) {
            panic!("panicking twice to abort the program");
        }
    }

    let _bomb = DoublePanic;
    panic!("{}", s);
}