{"abstract":"One buffered callback delivery clears every pending value; the returned lifecycle plan violates the stated transition contract.","category":"Listener lifecycle","checks":8,"contract":"Plan a local subscription callback buffer. Input queue is arrival ordered. Drop-oldest keeps the newest capacity records; drop-newest keeps the oldest. Capacity zero retains nothing. Delivery removes at most one item, cancellation clears all items, completion waits for a nonempty buffer, and overflow errors are signaled only under error policy. Notification storage may contain stale records after termination. Deliver values only before the first complete or error marker. 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.\nField definitions, each independently computed from the input snapshot: oldest = s['queue'][-s['capacity']:] if s['capacity'] else []; newest = s['queue'][:s['capacity']]; append = list(s['queue'])+([s['incoming']] if s['incoming'] is not None else []); next = s['queue'][0] if s['queue'] and s['deliver'] and not s['cancel'] else None; after_delivery = s['queue'][1:] if s['deliver'] and s['queue'] else list(s['queue']); cancelled_queue = [] if s['cancel'] else list(s['queue']); overflow_error = len(s['queue'])>s['capacity'] and s['policy']=='error'; complete_now = [r[1] for r in s['notifications'][:next((i for i,r in enumerate(s['notifications']) if r[0] in ('complete','error')),len(s['notifications']))] if r[0]=='value']; dropped = max(0,len(s['queue'])-s['capacity']); errors = s['errors']+int(len(s['queue'])>s['capacity'] and s['policy']=='error')","evaluation_group":"s3-listener-bounded-buffer","failed_approach":"The partial repair uses s['queue'][1:]; a retained regression distinguishes it from the full transition.","family":"s3-listener-bounded-buffer-after_delivery","id":"FA-42011","implementations":{"attempt":{"sha256":"433f88d8142260c47decd86d2e2e88969d1eef2c07b2d95c4e117e42c862d4fb","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(s):\n    return {\n        'oldest': s['queue'][-s['capacity']:] if s['capacity'] else [],\n        'newest': s['queue'][:s['capacity']],\n        'append': list(s['queue'])+([s['incoming']] if s['incoming'] is not None else []),\n        'next': s['queue'][0] if s['queue'] and s['deliver'] and not s['cancel'] else None,\n        'after_delivery': s['queue'][1:],\n        'cancelled_queue': [] if s['cancel'] else list(s['queue']),\n        'overflow_error': len(s['queue'])>s['capacity'] and s['policy']=='error',\n        'complete_now': [r[1] for r in s['notifications'][:next((i for i,r in enumerate(s['notifications']) if r[0] in ('complete','error')),len(s['notifications']))] if r[0]=='value'],\n        'dropped': max(0,len(s['queue'])-s['capacity']),\n        'errors': s['errors']+int(len(s['queue'])>s['capacity'] and s['policy']=='error'),\n    }\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = {1: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 0, 'policy': 'newest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 2, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 3, 'errors': 2}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 1, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 2, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 2}), ({'queue': [], 'incoming': 'new', 'capacity': 3, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 2, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 2}), ({'queue': ['a'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a', 'new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'newest', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 3, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 3, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 2, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 2})], 2: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 4, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 4}), ({'queue': ['a'], 'incoming': None, 'capacity': 0, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 4, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a'], 'next': None, 'after_delivery': ['a'], 'cancelled_queue': [], 'overflow_error': True, 'complete_now': ['a'], 'dropped': 1, 'errors': 5}), ({'queue': [], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a', 'new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': [], 'dropped': 2, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 4, 'notifications': []}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': True, 'complete_now': [], 'dropped': 2, 'errors': 5}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 6, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 4, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 4})], 3: [({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 1, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 6, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 6}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': [], 'dropped': 3, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 6, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 6}), ({'queue': ['a'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a', 'new'], 'next': 'a', 'after_delivery': [], 'cancelled_queue': ['a'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': [], 'dropped': 3, 'errors': 0}), ({'queue': ['a'], 'incoming': None, 'capacity': 1, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a'], 'next': None, 'after_delivery': ['a'], 'cancelled_queue': ['a'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 9, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 6, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 6})], 4: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'newest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 8, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 8}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': [], 'overflow_error': True, 'complete_now': ['a'], 'dropped': 3, 'errors': 1}), ({'queue': [], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a'], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a'], 'next': None, 'after_delivery': ['a'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': 'new', 'capacity': 0, 'policy': 'newest', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 12, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 8, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 8})], 5: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 0, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 3, 'errors': 10}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 1, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 0}), ({'queue': [], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 10}), ({'queue': ['a'], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a'], 'next': 'a', 'after_delivery': [], 'cancelled_queue': ['a'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': True, 'complete_now': ['a'], 'dropped': 3, 'errors': 11}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 15, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 10, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 10}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 15, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 10})]}\nfor i,(state,expected) in enumerate(fixtures[N]):\n    check(\"transition \"+str(i), solve(state), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"04b75e4ca11a0a924c060323870d030fccbe6e36a605adfc16fabbbccc1c7b58","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(s):\n    return {\n        'oldest': s['queue'][-s['capacity']:] if s['capacity'] else [],\n        'newest': s['queue'][:s['capacity']],\n        'append': list(s['queue'])+([s['incoming']] if s['incoming'] is not None else []),\n        'next': s['queue'][0] if s['queue'] and s['deliver'] and not s['cancel'] else None,\n        'after_delivery': [] if s['deliver'] else list(s['queue']),\n        'cancelled_queue': [] if s['cancel'] else list(s['queue']),\n        'overflow_error': len(s['queue'])>s['capacity'] and s['policy']=='error',\n        'complete_now': [r[1] for r in s['notifications'][:next((i for i,r in enumerate(s['notifications']) if r[0] in ('complete','error')),len(s['notifications']))] if r[0]=='value'],\n        'dropped': max(0,len(s['queue'])-s['capacity']),\n        'errors': s['errors']+int(len(s['queue'])>s['capacity'] and s['policy']=='error'),\n    }\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = {1: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 0, 'policy': 'newest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 2, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 3, 'errors': 2}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 1, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 2, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 2}), ({'queue': [], 'incoming': 'new', 'capacity': 3, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 2, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 2}), ({'queue': ['a'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a', 'new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'newest', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 3, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 3, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 2, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 2})], 2: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 4, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 4}), ({'queue': ['a'], 'incoming': None, 'capacity': 0, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 4, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a'], 'next': None, 'after_delivery': ['a'], 'cancelled_queue': [], 'overflow_error': True, 'complete_now': ['a'], 'dropped': 1, 'errors': 5}), ({'queue': [], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a', 'new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': [], 'dropped': 2, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 4, 'notifications': []}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': True, 'complete_now': [], 'dropped': 2, 'errors': 5}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 6, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 4, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 4})], 3: [({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 1, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 6, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 6}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': [], 'dropped': 3, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 6, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 6}), ({'queue': ['a'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a', 'new'], 'next': 'a', 'after_delivery': [], 'cancelled_queue': ['a'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': [], 'dropped': 3, 'errors': 0}), ({'queue': ['a'], 'incoming': None, 'capacity': 1, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a'], 'next': None, 'after_delivery': ['a'], 'cancelled_queue': ['a'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 9, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 6, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 6})], 4: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'newest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 8, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 8}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': [], 'overflow_error': True, 'complete_now': ['a'], 'dropped': 3, 'errors': 1}), ({'queue': [], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a'], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a'], 'next': None, 'after_delivery': ['a'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': 'new', 'capacity': 0, 'policy': 'newest', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 12, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 8, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 8})], 5: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 0, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 3, 'errors': 10}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 1, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 0}), ({'queue': [], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 10}), ({'queue': ['a'], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a'], 'next': 'a', 'after_delivery': [], 'cancelled_queue': ['a'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': True, 'complete_now': ['a'], 'dropped': 3, 'errors': 11}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 15, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 10, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 10}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 15, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 10})]}\nfor i,(state,expected) in enumerate(fixtures[N]):\n    check(\"transition \"+str(i), solve(state), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"20b0c56cd163eb4c83298e59db8ed4a89d13963cbcc681de831e37ed3bed4fa4","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(s):\n    return {\n        'oldest': s['queue'][-s['capacity']:] if s['capacity'] else [],\n        'newest': s['queue'][:s['capacity']],\n        'append': list(s['queue'])+([s['incoming']] if s['incoming'] is not None else []),\n        'next': s['queue'][0] if s['queue'] and s['deliver'] and not s['cancel'] else None,\n        'after_delivery': s['queue'][1:] if s['deliver'] and s['queue'] else list(s['queue']),\n        'cancelled_queue': [] if s['cancel'] else list(s['queue']),\n        'overflow_error': len(s['queue'])>s['capacity'] and s['policy']=='error',\n        'complete_now': [r[1] for r in s['notifications'][:next((i for i,r in enumerate(s['notifications']) if r[0] in ('complete','error')),len(s['notifications']))] if r[0]=='value'],\n        'dropped': max(0,len(s['queue'])-s['capacity']),\n        'errors': s['errors']+int(len(s['queue'])>s['capacity'] and s['policy']=='error'),\n    }\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = {1: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 0, 'policy': 'newest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 2, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 3, 'errors': 2}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 1, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 2, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 2}), ({'queue': [], 'incoming': 'new', 'capacity': 3, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 2, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 2}), ({'queue': ['a'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a', 'new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'newest', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 3, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 3, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 2, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 2})], 2: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 4, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 4}), ({'queue': ['a'], 'incoming': None, 'capacity': 0, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 4, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a'], 'next': None, 'after_delivery': ['a'], 'cancelled_queue': [], 'overflow_error': True, 'complete_now': ['a'], 'dropped': 1, 'errors': 5}), ({'queue': [], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a', 'new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': [], 'dropped': 2, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 4, 'notifications': []}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': True, 'complete_now': [], 'dropped': 2, 'errors': 5}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 6, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 4, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 4})], 3: [({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 1, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 6, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 6}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': [], 'dropped': 3, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 6, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 6}), ({'queue': ['a'], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a', 'new'], 'next': 'a', 'after_delivery': [], 'cancelled_queue': ['a'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': [], 'dropped': 3, 'errors': 0}), ({'queue': ['a'], 'incoming': None, 'capacity': 1, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a'], 'next': None, 'after_delivery': ['a'], 'cancelled_queue': ['a'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 9, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 6, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 6})], 4: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 1, 'policy': 'newest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 8, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 8}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': [], 'overflow_error': True, 'complete_now': ['a'], 'dropped': 3, 'errors': 1}), ({'queue': [], 'incoming': 'new', 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': True, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a'], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a'], 'next': None, 'after_delivery': ['a'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': 'new', 'capacity': 0, 'policy': 'newest', 'cancel': False, 'deliver': True, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 12, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 8, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 8})], 5: [({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 0, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 3, 'errors': 10}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 1, 'policy': 'newest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['c'], 'newest': ['a'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['a', 'b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 2, 'errors': 0}), ({'queue': [], 'incoming': 'new', 'capacity': 1, 'policy': 'oldest', 'cancel': True, 'deliver': False, 'complete': False, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['new'], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 10}), ({'queue': ['a'], 'incoming': None, 'capacity': 1, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 0, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a'], 'newest': ['a'], 'append': ['a'], 'next': 'a', 'after_delivery': [], 'cancelled_queue': ['a'], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 0, 'policy': 'error', 'cancel': False, 'deliver': True, 'complete': True, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': [], 'newest': [], 'append': ['a', 'b', 'c'], 'next': 'a', 'after_delivery': ['b', 'c'], 'cancelled_queue': ['a', 'b', 'c'], 'overflow_error': True, 'complete_now': ['a'], 'dropped': 3, 'errors': 11}), ({'queue': ['a', 'b', 'c'], 'incoming': None, 'capacity': 15, 'policy': 'oldest', 'cancel': True, 'deliver': True, 'complete': False, 'errors': 10, 'notifications': [['value', 'a'], ['complete', None], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 10}), ({'queue': [], 'incoming': None, 'capacity': 0, 'policy': 'oldest', 'cancel': False, 'deliver': False, 'complete': False, 'errors': 0, 'notifications': []}, {'oldest': [], 'newest': [], 'append': [], 'next': None, 'after_delivery': [], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': [], 'dropped': 0, 'errors': 0}), ({'queue': ['a', 'b', 'c'], 'incoming': 'new', 'capacity': 15, 'policy': 'error', 'cancel': True, 'deliver': True, 'complete': True, 'errors': 10, 'notifications': [['value', 'a'], ['error', 'bad'], ['value', 'late']]}, {'oldest': ['a', 'b', 'c'], 'newest': ['a', 'b', 'c'], 'append': ['a', 'b', 'c', 'new'], 'next': None, 'after_delivery': ['b', 'c'], 'cancelled_queue': [], 'overflow_error': False, 'complete_now': ['a'], 'dropped': 0, 'errors': 10})]}\nfor i,(state,expected) in enumerate(fixtures[N]):\n    check(\"transition \"+str(i), solve(state), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"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.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"s3-listener-bounded-buffer-after_delivery","generated_at":"2026-09-29T14:43:47.143911+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Observer implementations need to preserve this state while subscriptions enter, execute, and leave their lifecycle.","repair":"Compute the after_delivery decision from the complete contract: s['queue'][1:] if s['deliver'] and s['queue'] else list(s['queue']).","root_cause":"The after_delivery decision in the bounded-buffer listener model is computed as [] if s['deliver'] else list(s['queue']), losing a required lifecycle condition.","sha256":"de3ef1406bf3f9daafbd1d3652df9fcb2f6778101c74d5aed2c0b6d0a0062e5a","title":"One buffered callback delivery clears every pending value · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":44.89,"exit_code":1,"observations":[{"actual":{"after_delivery":["b","c"],"append":["a","b","c","new"],"cancelled_queue":[],"complete_now":["a"],"dropped":3,"errors":2,"newest":[],"next":null,"oldest":[],"overflow_error":false},"check":"transition 0","expected":{"after_delivery":["b","c"],"append":["a","b","c","new"],"cancelled_queue":[],"complete_now":["a"],"dropped":3,"errors":2,"newest":[],"next":null,"oldest":[],"overflow_error":false},"passed":true},{"actual":{"after_delivery":["b","c"],"append":["a","b","c"],"cancelled_queue":["a","b","c"],"complete_now":["a"],"dropped":2,"errors":2,"newest":["a"],"next":null,"oldest":["c"],"overflow_error":false},"check":"transition 1","expected":{"after_delivery":["a","b","c"],"append":["a","b","c"],"cancelled_queue":["a","b","c"],"complete_now":["a"],"dropped":2,"errors":2,"newest":["a"],"next":null,"oldest":["c"],"overflow_error":false},"passed":false},{"actual":{"after_delivery":[],"append":["new"],"cancelled_queue":[],"complete_now":[],"dropped":0,"errors":2,"newest":[],"next":null,"oldest":[],"overflow_error":false},"check":"transition 2","expected":{"after_delivery":[],"append":["new"],"cancelled_queue":[],"complete_now":[],"dropped":0,"errors":2,"newest":[],"next":null,"oldest":[],"overflow_error":false},"passed":true},{"actual":{"after_delivery":[],"append":["a","new"],"cancelled_queue":[],"complete_now":[],"dropped":0,"errors":0,"newest":["a"],"next":null,"oldest":["a"],"overflow_error":false},"check":"transition 3","expected":{"after_delivery":[],"append":["a","new"],"cancelled_queue":[],"complete_now":[],"dropped":0,"errors":0,"newest":["a"],"next":null,"oldest":["a"],"overflow_error":false},"passed":true},{"actual":{"after_delivery":["b","c"],"append":["a","b","c","new"],"cancelled_queue":["a","b","c"],"complete_now":["a"],"dropped":2,"errors":0,"newest":["a"],"next":"a","oldest":["c"],"overflow_error":false},"check":"transition 4","expected":{"after_delivery":["b","c"],"append":["a","b","c","new"],"cancelled_queue":["a","b","c"],"complete_now":["a"],"dropped":2,"errors":0,"newest":["a"],"next":"a","oldest":["c"],"overflow_error":false},"passed":true},{"actual":{"after_delivery":["b","c"],"append":["a","b","c"],"cancelled_queue":["a","b","c"],"complete_now":["a"],"dropped":3,"errors":0,"newest":[],"next":"a","oldest":[],"overflow_error":false},"check":"transition 5","expected":{"after_delivery":["b","c"],"append":["a","b","c"],"cancelled_queue":["a","b","c"],"complete_now":["a"],"dropped":3,"errors":0,"newest":[],"next":"a","oldest":[],"overflow_error":false},"passed":true},{"actual":{"after_delivery":[],"append":[],"cancelled_queue":[],"complete_now":[],"dropped":0,"errors":0,"newest":[],"next":null,"oldest":[],"overflow_error":false},"check":"transition 6","expected":{"after_delivery":[],"append":[],"cancelled_queue":[],"complete_now":[],"dropped":0,"errors":0,"newest":[],"next":null,"oldest":[],"overflow_error":false},"passed":true},{"actual":{"after_delivery":["b","c"],"append":["a","b","c","new"],"cancelled_queue":[],"complete_now":["a"],"dropped":0,"errors":2,"newest":["a","b","c"],"next":null,"oldest":["a","b","c"],"overflow_error":false},"check":"transition 7","expected":{"after_delivery":["b","c"],"append":["a","b","c","new"],"cancelled_queue":[],"complete_now":["a"],"dropped":0,"errors":2,"newest":["a","b","c"],"next":null,"oldest":["a","b","c"],"overflow_error":false},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"transition 0\", \"actual\": {\"oldest\": [], \"newest\": [], \"append\": [\"a\", \"b\", \"c\", \"new\"], \"next\": null, \"after_delivery\": [\"b\", \"c\"], \"cancelled_queue\": [], \"overflow_error\": false, \"complete_now\": [\"a\"], \"dropped\": 3, \"errors\": 2}, \"expected\": {\"oldest\": [], \"newest\": [], \"append\": [\"a\", \"b\", \"c\", \"new\"], \"next\": null, \"after_delivery\": [\"b\", \"c\"], \"cancelled_queue\": [], \"overflow_error\": false, \"complete_now\": [\"a\"], \"dropped\": 3, \"errors\": 2}, \"passed\": true}, {\"check\": \"transition 1\", \"actual\": {\"oldest\": [\"c\"], \"newest\": [\"a\"], \"append\": [\"a\", \"b\", \"c\"], \"next\": null, \"after_delivery\": [\"b\", \"c\"], \"cancelled_queue\": [\"a\", \"b\", \"c\"], \"overflow_error\": false, \"complete_now\": [\"a\"], \"dropped\": 2, \"errors\": 2}, \"expected\": {\"oldest\": [\"c\"], \"newest\": [\"a\"], \"append\": [\"a\", \"b\", \"c\"], \"next\": null, \"after_delivery\": [\"a\", \"b\", \"c\"], \"cancelled_queue\": [\"a\", \"b\", \"c\"], \"overflow_error\": false, \"complete_now\": [\"a\"], \"dropped\": 2, \"errors\": 2}, \"passed\": false}, {\"check\": \"transition 2\", \"actual\": {\"oldest\": [], \"newest\": [], \"append\": [\"new\"], \"next\": null, \"after_delivery\": [], \"cancelled_queue\": [], \"overflow_error\": false, \"complete_now\": [], \"dropped\": 0, \"errors\": 2}, \"expected\": {\"oldest\": [], \"newest\": [], \"append\": [\"new\"], \"next\": null, \"after_delivery\": [], \"cancelled_queue\": [], \"overflow_error\": false, \"complete_now\": [], \"dropped\": 0, \"errors\": 2}, \"passed\": true}, {\"check\": \"transition 3\", \"actual\": {\"oldest\": [\"a\"], \"newest\": [\"a\"], \"append\": [\"a\", \"new\"], \"next\": null, \"after_delivery\": [], \"cancelled_queue\": [], \"overflow_error\": false, \"complete_now\": [], \"dropped\": 0, \"errors\": 0}, \"expected\": {\"oldest\": [\"a\"], \"newest\": [\"a\"], \"append\": [\"a\", \"new\"], \"next\": null, \"after_delivery\": [], \"cancelled_queue\": [], \"overflow_error\": false, \"complete_now\": [], \"dropped\": 0, \"errors\": 0}, \"passed\": true}, {\"check\": \"transition 4\", \"actual\": {\"oldest\": [\"c\"], \"newest\": [\"a\"], \"append\": [\"a\", \"b\", \"c\", \"new\"], \"next\": \"a\", \"after_delivery\": [\"b\", \"c\"], \"cancelled_queue\": [\"a\", \"b\", \"c\"], \"overflow_error\": false, \"complete_now\": [\"a\"], \"dropped\": 2, \"errors\": 0}, \"expected\": {\"oldest\": [\"c\"], \"newest\": [\"a\"], \"append\": [\"a\", \"b\", \"c\", \"new\"], \"next\": \"a\", \"after_delivery\": [\"b\", \"c\"], \"cancelled_queue\": [\"a\", \"b\", \"c\"], \"overflow_error\": false, \"complete_now\": [\"a\"], \"dropped\": 2, \"errors\": 0}, \"passed\": true}, {\"check\": \"transition 5\", \"actual\": {\"oldest\": [], \"newest\": [], \"append\": [\"a\", \"b\", \"c\"], \"next\": \"a\", \"after_delivery\": [\"b\", \"c\"], \"cancelled_queue\": [\"a\", \"b\", \"c\"], \"overflow_error\": false, \"complete_now\": [\"a\"], \"dropped\": 3, \"errors\": 0}, \"expected\": {\"oldest\": [], \"newest\": [], \"append\": [\"a\", \"b\", \"c\"], \"next\": \"a\", \"after_delivery\": [\"b\", \"c\"], \"cancelled_queue\": [\"a\", \"b\", \"c\"], \"overflow_error\": false, \"complete_now\": [\"a\"], \"dropped\": 3, \"errors\": 0}, \"passed\": true}, {\"check\": \"transition 6\", \"actual\": {\"oldest\": [], \"newest\": [], \"append\": [], \"next\": null, \"after_delivery\": [], \"cancelled_queue\": [], \"overflow_error\": false, \"complete_now\": [], \"dropped\": 0, \"errors\": 0}, \"expected\": {\"oldest\": [], \"newest\": [], \"append\": [], \"next\": null, \"after_delivery\": [], 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