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FA-41551 / Listener lifecycle / Open access

Target collection leaves a live listener registry slot · case 01

Target collection leaves a live listener registry slot; the returned lifecycle plan violates the stated transition contract.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The tombstone decision in the weak-target listener model is computed as s['tombstone'], losing a required lifecycle condition.

VERIFIED REPAIR

Compute the tombstone decision from the complete contract: s['tombstone'] or s['finalized'] or (not s['alive'] and not s['strong']).

Unsuccessful approach: The partial repair uses s['tombstone'] or not s['alive']; a retained regression distinguishes it from the full transition.

Case contract

Resolve a weakly owned observer target at dispatch time. A dead or finalized target is skipped, its registration becomes a tombstone, and a live target is pinned only for the callback. Sweep only tombstones outside dispatch. A strong-owner override prevents collection but does not revive a finalized target. Dead callback contexts are also excluded. A weak method binding resolves its exact method name or becomes absent; a different extant fallback method is never invoked. Inputs are finite state snapshots, including transitional and stale states; output fields are the exact independent actions/metadata defined by the corrected expression table. Numeric fixture capacities and counts vary with N. Field definitions, each independently computed from the input snapshot: invoke = s['registered'] and (s['alive'] or s['strong']) and not s['finalized'] and s['context_alive'] and s['callback']; pin = s['dispatching'] and (s['alive'] or s['strong']) and not s['finalized']; tombstone = s['tombstone'] or s['finalized'] or (not s['alive'] and not s['strong']); sweep = s['sweep'] and s['tombstone'] and not s['dispatching']; context = not s['context_alive']; pins = max(0,s['pins']-int(s['dispatching'])); retain = s['strong'] and not s['finalized']; resurrect = False; orphan = s['method'] if s['method'] in s['methods'] else None; defer = s['sweep'] and s['tombstone'] and s['dispatching']

Why this case matters

Observer implementations need to preserve this state while subscriptions enter, execute, and leave their lifecycle.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(s):
    return {
        'invoke': s['registered'] and (s['alive'] or s['strong']) and not s['finalized'] and s['context_alive'] and s['callback'],
        'pin': s['dispatching'] and (s['alive'] or s['strong']) and not s['finalized'],
        'tombstone': s['tombstone'],
        'sweep': s['sweep'] and s['tombstone'] and not s['dispatching'],
        'context': not s['context_alive'],
        'pins': max(0,s['pins']-int(s['dispatching'])),
        'retain': s['strong'] and not s['finalized'],
        'resurrect': False,
        'orphan': s['method'] if s['method'] in s['methods'] else None,
        'defer': s['sweep'] and s['tombstone'] and s['dispatching'],
    }
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 2, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 1, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': True, 'finalized': True, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 2, 'sweep': True, 'callback': True, 'registered': False, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 2, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': False, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 2, 'sweep': False, 'callback': False, 'registered': False, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': False, 'sweep': False, 'context': False, 'pins': 2, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': True, 'registered': True, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': False, 'tombstone': True, 'pins': 2, 'sweep': True, 'callback': False, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': True, 'context': True, 'pins': 2, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 2, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 1, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 2: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 4, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 3, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': True, 'finalized': True, 'strong': False, 'context_alive': True, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': False, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': False, 'strong': True, 'context_alive': True, 'dispatching': False, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': False, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': True, 'context': False, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 4, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 3, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 3: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 6, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 5, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': True}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 6, 'sweep': True, 'callback': False, 'registered': False, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': False, 'sweep': False, 'context': False, 'pins': 6, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': False, 'tombstone': True, 'pins': 0, 'sweep': False, 'callback': False, 'registered': True, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 6, 'sweep': False, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 5, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': True, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': False, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 6, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 5, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 4: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 8, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 7, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': True, 'finalized': True, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': True, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': True, 'strong': False, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 8, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 7, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 5: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 10, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 9, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': False, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': True, 'registered': False, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': False, 'finalized': False, 'strong': True, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': True, 'pin': False, 'tombstone': False, 'sweep': False, 'context': False, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': True, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 10, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 9, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': True, 'registered': False, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': False, 'sweep': False, 'context': True, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 10, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 9, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})]}
for i,(state,expected) in enumerate(fixtures[N]):
    check("transition "+str(i), solve(state), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
transition 0{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Failed
transition 1{'context': True, 'defer': True, 'invoke': False, 'orphan': None, 'pin': True, 'pins': 0, 'resurrect': False, 'retain': True, 'sweep': False, 'tombstone': True}{'context': True, 'defer': True, 'invoke': False, 'orphan': None, 'pin': True, 'pins': 0, 'resurrect': False, 'retain': True, 'sweep': False, 'tombstone': True}Passed
transition 2{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Failed
transition 3{'context': False, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}{'context': False, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}Passed
transition 4{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Failed
transition 5{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': True, 'tombstone': True}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': True, 'tombstone': True}Passed
transition 6{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Failed
transition 7{'context': False, 'defer': True, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}{'context': False, 'defer': True, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Passed

SHA-256 / ab155c1c85ceb5020bde3a1095360728912232b21d07d5ce75ae16a1f11ac2fa

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(s):
    return {
        'invoke': s['registered'] and (s['alive'] or s['strong']) and not s['finalized'] and s['context_alive'] and s['callback'],
        'pin': s['dispatching'] and (s['alive'] or s['strong']) and not s['finalized'],
        'tombstone': s['tombstone'] or not s['alive'],
        'sweep': s['sweep'] and s['tombstone'] and not s['dispatching'],
        'context': not s['context_alive'],
        'pins': max(0,s['pins']-int(s['dispatching'])),
        'retain': s['strong'] and not s['finalized'],
        'resurrect': False,
        'orphan': s['method'] if s['method'] in s['methods'] else None,
        'defer': s['sweep'] and s['tombstone'] and s['dispatching'],
    }
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 2, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 1, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': True, 'finalized': True, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 2, 'sweep': True, 'callback': True, 'registered': False, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 2, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': False, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 2, 'sweep': False, 'callback': False, 'registered': False, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': False, 'sweep': False, 'context': False, 'pins': 2, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': True, 'registered': True, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': False, 'tombstone': True, 'pins': 2, 'sweep': True, 'callback': False, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': True, 'context': True, 'pins': 2, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 2, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 1, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 2: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 4, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 3, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': True, 'finalized': True, 'strong': False, 'context_alive': True, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': False, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': False, 'strong': True, 'context_alive': True, 'dispatching': False, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': False, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': True, 'context': False, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 4, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 3, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 3: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 6, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 5, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': True}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 6, 'sweep': True, 'callback': False, 'registered': False, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': False, 'sweep': False, 'context': False, 'pins': 6, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': False, 'tombstone': True, 'pins': 0, 'sweep': False, 'callback': False, 'registered': True, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 6, 'sweep': False, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 5, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': True, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': False, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 6, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 5, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 4: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 8, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 7, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': True, 'finalized': True, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': True, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': True, 'strong': False, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 8, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 7, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 5: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 10, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 9, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': False, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': True, 'registered': False, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': False, 'finalized': False, 'strong': True, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': True, 'pin': False, 'tombstone': False, 'sweep': False, 'context': False, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': True, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 10, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 9, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': True, 'registered': False, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': False, 'sweep': False, 'context': True, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 10, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 9, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})]}
for i,(state,expected) in enumerate(fixtures[N]):
    check("transition "+str(i), solve(state), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
transition 0{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Failed
transition 1{'context': True, 'defer': True, 'invoke': False, 'orphan': None, 'pin': True, 'pins': 0, 'resurrect': False, 'retain': True, 'sweep': False, 'tombstone': True}{'context': True, 'defer': True, 'invoke': False, 'orphan': None, 'pin': True, 'pins': 0, 'resurrect': False, 'retain': True, 'sweep': False, 'tombstone': True}Passed
transition 2{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Failed
transition 3{'context': False, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}{'context': False, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}Passed
transition 4{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Passed
transition 5{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': True, 'tombstone': True}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': True, 'tombstone': True}Passed
transition 6{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Passed
transition 7{'context': False, 'defer': True, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}{'context': False, 'defer': True, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Passed

SHA-256 / 6dcbb17928580c72f1d74db1f2ac471df161bd6e5157da67c8d60a4058593f53

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(s):
    return {
        'invoke': s['registered'] and (s['alive'] or s['strong']) and not s['finalized'] and s['context_alive'] and s['callback'],
        'pin': s['dispatching'] and (s['alive'] or s['strong']) and not s['finalized'],
        'tombstone': s['tombstone'] or s['finalized'] or (not s['alive'] and not s['strong']),
        'sweep': s['sweep'] and s['tombstone'] and not s['dispatching'],
        'context': not s['context_alive'],
        'pins': max(0,s['pins']-int(s['dispatching'])),
        'retain': s['strong'] and not s['finalized'],
        'resurrect': False,
        'orphan': s['method'] if s['method'] in s['methods'] else None,
        'defer': s['sweep'] and s['tombstone'] and s['dispatching'],
    }
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 2, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 1, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': True, 'finalized': True, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 2, 'sweep': True, 'callback': True, 'registered': False, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 2, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': False, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 2, 'sweep': False, 'callback': False, 'registered': False, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': False, 'sweep': False, 'context': False, 'pins': 2, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': True, 'registered': True, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': False, 'tombstone': True, 'pins': 2, 'sweep': True, 'callback': False, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': True, 'context': True, 'pins': 2, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 2, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 1, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 2: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 4, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 3, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': True, 'finalized': True, 'strong': False, 'context_alive': True, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': False, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': False, 'strong': True, 'context_alive': True, 'dispatching': False, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': False, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': True, 'context': False, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 4, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 3, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 3: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 6, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 5, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': True}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 6, 'sweep': True, 'callback': False, 'registered': False, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': False, 'sweep': False, 'context': False, 'pins': 6, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': False, 'tombstone': True, 'pins': 0, 'sweep': False, 'callback': False, 'registered': True, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 6, 'sweep': False, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 5, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': True, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': False, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 6, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 5, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 4: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': True, 'pins': 8, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 7, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': True, 'finalized': True, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': True, 'strong': False, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': 'on_data', 'defer': False}), ({'alive': False, 'finalized': True, 'strong': False, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 8, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 7, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})], 5: [({'alive': True, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 10, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 9, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': False, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 0, 'sweep': True, 'callback': True, 'registered': False, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True}), ({'alive': False, 'finalized': False, 'strong': True, 'context_alive': True, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': True, 'pin': False, 'tombstone': False, 'sweep': False, 'context': False, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': True, 'callback': False, 'registered': True, 'method': 'missing', 'methods': ['on_data'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': True, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 10, 'sweep': True, 'callback': True, 'registered': True, 'method': 'on_data', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 9, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': False, 'strong': True, 'context_alive': False, 'dispatching': True, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': True, 'registered': False, 'method': 'missing', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': True, 'tombstone': False, 'sweep': False, 'context': True, 'pins': 0, 'retain': True, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': False, 'finalized': False, 'strong': False, 'context_alive': False, 'dispatching': False, 'tombstone': False, 'pins': 0, 'sweep': False, 'callback': False, 'registered': False, 'method': 'on_data', 'methods': [], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': True, 'pins': 0, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': False}), ({'alive': True, 'finalized': True, 'strong': True, 'context_alive': True, 'dispatching': True, 'tombstone': True, 'pins': 10, 'sweep': True, 'callback': True, 'registered': True, 'method': 'missing', 'methods': ['fallback'], 'fallback': 'fallback'}, {'invoke': False, 'pin': False, 'tombstone': True, 'sweep': False, 'context': False, 'pins': 9, 'retain': False, 'resurrect': False, 'orphan': None, 'defer': True})]}
for i,(state,expected) in enumerate(fixtures[N]):
    check("transition "+str(i), solve(state), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
transition 0{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Passed
transition 1{'context': True, 'defer': True, 'invoke': False, 'orphan': None, 'pin': True, 'pins': 0, 'resurrect': False, 'retain': True, 'sweep': False, 'tombstone': True}{'context': True, 'defer': True, 'invoke': False, 'orphan': None, 'pin': True, 'pins': 0, 'resurrect': False, 'retain': True, 'sweep': False, 'tombstone': True}Passed
transition 2{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Passed
transition 3{'context': False, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}{'context': False, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': False}Passed
transition 4{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Passed
transition 5{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': True, 'tombstone': True}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 2, 'resurrect': False, 'retain': False, 'sweep': True, 'tombstone': True}Passed
transition 6{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}{'context': True, 'defer': False, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 0, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Passed
transition 7{'context': False, 'defer': True, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}{'context': False, 'defer': True, 'invoke': False, 'orphan': None, 'pin': False, 'pins': 1, 'resurrect': False, 'retain': False, 'sweep': False, 'tombstone': True}Passed

SHA-256 / eeba5fa8bf908359e8afab29ed113c1f3ef9850125de988760951aeabc1f30b0

Verification & scope

A deterministic, bounded, single-threaded transition planner. Returned plans model state changes; they do not implement a production event framework. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:43:42.366999+00:00.

Case digest / c0f938540fcd37eb29a13e1054054c3788937614309540e63ecf77dfcd79bfdc