pipecircuit 0.0.15

Correct. Robust. Fast. Portable.
Documentation 
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use core::num::{NonZeroU32, NonZeroU64};

use crate::{Participant, TimerCancellationRefusal, TimerOut, storage::warp_table::Capacity};

use super::*;

struct Worker;
struct Completed;

impl Participant for Worker {
    type In<'message> = ();
    type Out<'message> = Completed;
}

#[kani::proof]
#[kani::unwind(10)]
fn exactly_one_of_completion_or_expiry_resolves_an_admitted_continuation() {
    let capacity = Capacity::new(NonZeroU32::MIN);
    let Ok(mut ledger) = ContinuationLedger::<()>::try_new(capacity) else {
        return;
    };
    let owed = Owed::wait(TimeoutAfter::nanoseconds(NonZeroU64::MIN));
    let ContinuationAdmissionOutcome::Admitted { admission } = ledger.admit::<Worker>((), owed)
    else {
        return;
    };
    let token = admission.timer_token();
    let Ok(armed) = (TimerOut::Armed { token }).into_arm_outcome() else {
        return;
    };
    let Ok(ContinuationArmOutcome::Armed { work }) = admission.settle_timer_arm(armed) else {
        return;
    };
    let completion = work.fulfill(Completed);

    if kani::any::<bool>() {
        let Ok(cancelled) = (TimerOut::Cancelled { token }).into_cancellation_outcome() else {
            return;
        };
        let Ok(ContinuationCancellationOutcome::Cancelled { completion }) =
            completion.settle_timer_cancellation(cancelled)
        else {
            return;
        };
        assert!(matches!(
            ledger.resolve(completion),
            ContinuationResolutionOutcome::Resolved { .. }
        ));
        assert!(matches!(
            ledger.expire(token),
            ContinuationExpirationOutcome::Stale { .. }
        ));
    } else {
        assert!(matches!(
            ledger.expire(token),
            ContinuationExpirationOutcome::Expired { .. }
        ));
        let Ok(refused) = (TimerOut::CancellationRefused {
            token,
            reason: TimerCancellationRefusal::NotArmed,
        })
        .into_cancellation_outcome() else {
            return;
        };
        assert!(matches!(
            completion.settle_timer_cancellation(refused),
            Ok(ContinuationCancellationOutcome::Stale { .. })
        ));
    }
    assert!(ledger.is_empty());
}