{"abstract":"The bounded run frontier certificate reports an incorrect heads.","category":"Heap invariants","checks":7,"contract":"A k-way heap merge frontier stores one cursor per sorted run. A frontier item identifies run r and its current offset. Pop run r current item, advance only its offset, omit exhausted runs, and report next head candidates sorted by (value,run). Return emitted value, cursor vector, heads, exhausted runs, remaining item count, and next run.","contract_signature":"d","evaluation_group":"s3-heap-model-run-frontier","failed_approach":"The local patch uses sorted([[runs[i][k],i] for i,k in enumerate(offsets) if k<len(runs[i])]) and still violates the stated relation.","family":"s3-heap-run-frontier-heads","id":"FA-41141","implementations":{"attempt":{"sha256":"d45888cbb1e3f418b59971c3e190bee858b604164ce6b33a189dfd645d8ec5b8","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(d):\n    runs=d['runs']; offsets=d['offsets']; r=d['pop_run']; out=list(offsets); value=runs[r][out[r]]; out[r]+=1; heads=sorted([[runs[i][k],i] for i,k in enumerate(out) if k<len(runs[i])])\n    return {'emitted': value,\n    'offsets': out,\n    'heads': sorted([[runs[i][k],i] for i,k in enumerate(offsets) if k<len(runs[i])]),\n    'exhausted': [i for i,k in enumerate(out) if k==len(runs[i])],\n    'remaining': sum(len(x)-k for x,k in zip(runs,out)),\n    'next_run': heads[0][1] if heads else None}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[({'runs': [[1]], 'offsets': [0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1], 'heads': [], 'exhausted': [0], 'remaining': 0, 'next_run': None}), ({'runs': [[1, 3], [2, 4]], 'offsets': [0, 0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1, 0], 'heads': [[2, 1], [3, 0]], 'exhausted': [], 'remaining': 3, 'next_run': 1}), ({'runs': [[1, 5, 9], [2, 4, 8]], 'offsets': [1, 1], 'pop_run': 1}, {'emitted': 4, 'offsets': [1, 2], 'heads': [[5, 0], [8, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[1, 2], [], [3]], 'offsets': [1, 0, 0], 'pop_run': 0}, {'emitted': 2, 'offsets': [2, 0, 0], 'heads': [[3, 2]], 'exhausted': [0, 1], 'remaining': 1, 'next_run': 2}), ({'runs': [[1, 4], [1, 3]], 'offsets': [0, 0], 'pop_run': 1}, {'emitted': 1, 'offsets': [0, 1], 'heads': [[1, 0], [3, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[2, 3], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 3, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None}), ({'runs': [[2, 4], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 4, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None})], [({'runs': [[1]], 'offsets': [0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1], 'heads': [], 'exhausted': [0], 'remaining': 0, 'next_run': None}), ({'runs': [[1, 3], [2, 4]], 'offsets': [0, 0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1, 0], 'heads': [[2, 1], [3, 0]], 'exhausted': [], 'remaining': 3, 'next_run': 1}), ({'runs': [[1, 5, 9], [2, 4, 8]], 'offsets': [1, 1], 'pop_run': 1}, {'emitted': 4, 'offsets': [1, 2], 'heads': [[5, 0], [8, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[1, 2], [], [3]], 'offsets': [1, 0, 0], 'pop_run': 0}, {'emitted': 2, 'offsets': [2, 0, 0], 'heads': [[3, 2]], 'exhausted': [0, 1], 'remaining': 1, 'next_run': 2}), ({'runs': [[1, 4], [1, 3]], 'offsets': [0, 0], 'pop_run': 1}, {'emitted': 1, 'offsets': [0, 1], 'heads': [[1, 0], [3, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[2, 3], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 3, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None}), ({'runs': [[2, 5], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 5, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None})], [({'runs': [[1]], 'offsets': [0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1], 'heads': [], 'exhausted': [0], 'remaining': 0, 'next_run': None}), ({'runs': [[1, 3], [2, 4]], 'offsets': [0, 0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1, 0], 'heads': [[2, 1], [3, 0]], 'exhausted': [], 'remaining': 3, 'next_run': 1}), ({'runs': [[1, 5, 9], [2, 4, 8]], 'offsets': [1, 1], 'pop_run': 1}, {'emitted': 4, 'offsets': [1, 2], 'heads': [[5, 0], [8, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[1, 2], [], [3]], 'offsets': [1, 0, 0], 'pop_run': 0}, {'emitted': 2, 'offsets': [2, 0, 0], 'heads': [[3, 2]], 'exhausted': [0, 1], 'remaining': 1, 'next_run': 2}), ({'runs': [[1, 4], [1, 3]], 'offsets': [0, 0], 'pop_run': 1}, {'emitted': 1, 'offsets': [0, 1], 'heads': [[1, 0], [3, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[2, 3], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 3, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None}), ({'runs': [[2, 6], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 6, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None})], [({'runs': [[1]], 'offsets': [0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1], 'heads': [], 'exhausted': [0], 'remaining': 0, 'next_run': None}), ({'runs': [[1, 3], [2, 4]], 'offsets': [0, 0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1, 0], 'heads': [[2, 1], [3, 0]], 'exhausted': [], 'remaining': 3, 'next_run': 1}), ({'runs': [[1, 5, 9], [2, 4, 8]], 'offsets': [1, 1], 'pop_run': 1}, {'emitted': 4, 'offsets': [1, 2], 'heads': [[5, 0], [8, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[1, 2], [], [3]], 'offsets': [1, 0, 0], 'pop_run': 0}, {'emitted': 2, 'offsets': [2, 0, 0], 'heads': [[3, 2]], 'exhausted': [0, 1], 'remaining': 1, 'next_run': 2}), ({'runs': [[1, 4], [1, 3]], 'offsets': [0, 0], 'pop_run': 1}, {'emitted': 1, 'offsets': [0, 1], 'heads': [[1, 0], [3, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[2, 3], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 3, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None}), ({'runs': [[2, 7], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 7, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None})], [({'runs': [[1]], 'offsets': [0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1], 'heads': [], 'exhausted': [0], 'remaining': 0, 'next_run': None}), ({'runs': [[1, 3], [2, 4]], 'offsets': [0, 0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1, 0], 'heads': [[2, 1], [3, 0]], 'exhausted': [], 'remaining': 3, 'next_run': 1}), ({'runs': [[1, 5, 9], [2, 4, 8]], 'offsets': [1, 1], 'pop_run': 1}, {'emitted': 4, 'offsets': [1, 2], 'heads': [[5, 0], [8, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[1, 2], [], [3]], 'offsets': [1, 0, 0], 'pop_run': 0}, {'emitted': 2, 'offsets': [2, 0, 0], 'heads': [[3, 2]], 'exhausted': [0, 1], 'remaining': 1, 'next_run': 2}), ({'runs': [[1, 4], [1, 3]], 'offsets': [0, 0], 'pop_run': 1}, {'emitted': 1, 'offsets': [0, 1], 'heads': [[1, 0], [3, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[2, 3], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 3, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None}), ({'runs': [[2, 8], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 8, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None})]][N-1]\ncheck('regression certificate 1', solve(cases[0][0]), cases[0][1])\ncheck('regression certificate 2', solve(cases[1][0]), cases[1][1])\ncheck('regression certificate 3', solve(cases[2][0]), cases[2][1])\ncheck('regression certificate 4', solve(cases[3][0]), cases[3][1])\ncheck('regression certificate 5', solve(cases[4][0]), cases[4][1])\ncheck('regression certificate 6', solve(cases[5][0]), cases[5][1])\ncheck('variant-dependent certificate', solve(cases[6][0]), cases[6][1])\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":"242bec65effb8b28e487440ddab1773ae1f5afb371dfa4c008289469d53d8efb","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(d):\n    runs=d['runs']; offsets=d['offsets']; r=d['pop_run']; out=list(offsets); value=runs[r][out[r]]; out[r]+=1; heads=sorted([[runs[i][k],i] for i,k in enumerate(out) if k<len(runs[i])])\n    return {'emitted': value,\n    'offsets': out,\n    'heads': sorted([[runs[i][0],i] for i,k in enumerate(out) if k<len(runs[i])]),\n    'exhausted': [i for i,k in enumerate(out) if k==len(runs[i])],\n    'remaining': sum(len(x)-k for x,k in zip(runs,out)),\n    'next_run': heads[0][1] if heads else None}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[({'runs': [[1]], 'offsets': [0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1], 'heads': [], 'exhausted': [0], 'remaining': 0, 'next_run': None}), ({'runs': [[1, 3], [2, 4]], 'offsets': [0, 0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1, 0], 'heads': [[2, 1], [3, 0]], 'exhausted': [], 'remaining': 3, 'next_run': 1}), ({'runs': [[1, 5, 9], [2, 4, 8]], 'offsets': [1, 1], 'pop_run': 1}, {'emitted': 4, 'offsets': [1, 2], 'heads': [[5, 0], [8, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[1, 2], [], [3]], 'offsets': [1, 0, 0], 'pop_run': 0}, {'emitted': 2, 'offsets': [2, 0, 0], 'heads': [[3, 2]], 'exhausted': [0, 1], 'remaining': 1, 'next_run': 2}), ({'runs': [[1, 4], [1, 3]], 'offsets': [0, 0], 'pop_run': 1}, {'emitted': 1, 'offsets': [0, 1], 'heads': [[1, 0], [3, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[2, 3], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 3, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None}), ({'runs': [[2, 4], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 4, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None})], [({'runs': [[1]], 'offsets': [0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1], 'heads': [], 'exhausted': [0], 'remaining': 0, 'next_run': None}), ({'runs': [[1, 3], [2, 4]], 'offsets': [0, 0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1, 0], 'heads': [[2, 1], [3, 0]], 'exhausted': [], 'remaining': 3, 'next_run': 1}), ({'runs': [[1, 5, 9], [2, 4, 8]], 'offsets': [1, 1], 'pop_run': 1}, {'emitted': 4, 'offsets': [1, 2], 'heads': [[5, 0], [8, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[1, 2], [], [3]], 'offsets': [1, 0, 0], 'pop_run': 0}, {'emitted': 2, 'offsets': [2, 0, 0], 'heads': [[3, 2]], 'exhausted': [0, 1], 'remaining': 1, 'next_run': 2}), ({'runs': [[1, 4], [1, 3]], 'offsets': [0, 0], 'pop_run': 1}, {'emitted': 1, 'offsets': [0, 1], 'heads': [[1, 0], [3, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[2, 3], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 3, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None}), ({'runs': [[2, 5], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 5, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None})], [({'runs': [[1]], 'offsets': [0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1], 'heads': [], 'exhausted': [0], 'remaining': 0, 'next_run': None}), ({'runs': [[1, 3], [2, 4]], 'offsets': [0, 0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1, 0], 'heads': [[2, 1], [3, 0]], 'exhausted': [], 'remaining': 3, 'next_run': 1}), ({'runs': [[1, 5, 9], [2, 4, 8]], 'offsets': [1, 1], 'pop_run': 1}, {'emitted': 4, 'offsets': [1, 2], 'heads': [[5, 0], [8, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[1, 2], [], [3]], 'offsets': [1, 0, 0], 'pop_run': 0}, {'emitted': 2, 'offsets': [2, 0, 0], 'heads': [[3, 2]], 'exhausted': [0, 1], 'remaining': 1, 'next_run': 2}), ({'runs': [[1, 4], [1, 3]], 'offsets': [0, 0], 'pop_run': 1}, {'emitted': 1, 'offsets': [0, 1], 'heads': [[1, 0], [3, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[2, 3], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 3, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None}), ({'runs': [[2, 6], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 6, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None})], [({'runs': [[1]], 'offsets': [0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1], 'heads': [], 'exhausted': [0], 'remaining': 0, 'next_run': None}), ({'runs': [[1, 3], [2, 4]], 'offsets': [0, 0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1, 0], 'heads': [[2, 1], [3, 0]], 'exhausted': [], 'remaining': 3, 'next_run': 1}), ({'runs': [[1, 5, 9], [2, 4, 8]], 'offsets': [1, 1], 'pop_run': 1}, {'emitted': 4, 'offsets': [1, 2], 'heads': [[5, 0], [8, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[1, 2], [], [3]], 'offsets': [1, 0, 0], 'pop_run': 0}, {'emitted': 2, 'offsets': [2, 0, 0], 'heads': [[3, 2]], 'exhausted': [0, 1], 'remaining': 1, 'next_run': 2}), ({'runs': [[1, 4], [1, 3]], 'offsets': [0, 0], 'pop_run': 1}, {'emitted': 1, 'offsets': [0, 1], 'heads': [[1, 0], [3, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[2, 3], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 3, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None}), ({'runs': [[2, 7], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 7, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None})], [({'runs': [[1]], 'offsets': [0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1], 'heads': [], 'exhausted': [0], 'remaining': 0, 'next_run': None}), ({'runs': [[1, 3], [2, 4]], 'offsets': [0, 0], 'pop_run': 0}, {'emitted': 1, 'offsets': [1, 0], 'heads': [[2, 1], [3, 0]], 'exhausted': [], 'remaining': 3, 'next_run': 1}), ({'runs': [[1, 5, 9], [2, 4, 8]], 'offsets': [1, 1], 'pop_run': 1}, {'emitted': 4, 'offsets': [1, 2], 'heads': [[5, 0], [8, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[1, 2], [], [3]], 'offsets': [1, 0, 0], 'pop_run': 0}, {'emitted': 2, 'offsets': [2, 0, 0], 'heads': [[3, 2]], 'exhausted': [0, 1], 'remaining': 1, 'next_run': 2}), ({'runs': [[1, 4], [1, 3]], 'offsets': [0, 0], 'pop_run': 1}, {'emitted': 1, 'offsets': [0, 1], 'heads': [[1, 0], [3, 1]], 'exhausted': [], 'remaining': 3, 'next_run': 0}), ({'runs': [[2, 3], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 3, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None}), ({'runs': [[2, 8], [1]], 'offsets': [1, 1], 'pop_run': 0}, {'emitted': 8, 'offsets': [2, 1], 'heads': [], 'exhausted': [0, 1], 'remaining': 0, 'next_run': None})]][N-1]\ncheck('regression certificate 1', solve(cases[0][0]), cases[0][1])\ncheck('regression certificate 2', solve(cases[1][0]), cases[1][1])\ncheck('regression certificate 3', solve(cases[2][0]), cases[2][1])\ncheck('regression certificate 4', solve(cases[3][0]), cases[3][1])\ncheck('regression certificate 5', solve(cases[4][0]), cases[4][1])\ncheck('regression certificate 6', solve(cases[5][0]), cases[5][1])\ncheck('variant-dependent certificate', solve(cases[6][0]), cases[6][1])\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 stipulated offline diagnostic model; it does not implement a production allocator, concurrency protocol, or complete heap library. 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-heap-run-frontier-heads","generated_at":"2026-09-29T14:43:38.169412+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This isolates an internal heap representation or priority-structure invariant using deterministic finite records.","root_cause":"Heap merge frontier refreshes each head from its post-pop cursor.","sha256":"b48bb7e7cb8d1d8f80686095f6e388633723df012b81cee061fc1dea937593c8","title":"Heap merge frontier refreshes each head from its post-pop cursor · case 01","variant":1,"variant_policy":"Six explicit regression certificates are retained; a seventh changes structural size, position, priority, or bounds with N.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":42.181,"exit_code":1,"observations":[{"actual":{"emitted":1,"exhausted":[0],"heads":[[1,0]],"next_run":null,"offsets":[1],"remaining":0},"check":"regression certificate 1","expected":{"emitted":1,"exhausted":[0],"heads":[],"next_run":null,"offsets":[1],"remaining":0},"passed":false},{"actual":{"emitted":1,"exhausted":[],"heads":[[1,0],[2,1]],"next_run":1,"offsets":[1,0],"remaining":3},"check":"regression certificate 2","expected":{"emitted":1,"exhausted":[],"heads":[[2,1],[3,0]],"next_run":1,"offsets":[1,0],"remaining":3},"passed":false},{"actual":{"emitted":4,"exhausted":[],"heads":[[4,1],[5,0]],"next_run":0,"offsets":[1,2],"remaining":3},"check":"regression certificate 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6","expected":{"emitted":3,"exhausted":[0,1],"heads":[],"next_run":null,"offsets":[2,1],"remaining":0},"passed":false},{"actual":{"emitted":4,"exhausted":[0,1],"heads":[[4,0]],"next_run":null,"offsets":[2,1],"remaining":0},"check":"variant-dependent certificate","expected":{"emitted":4,"exhausted":[0,1],"heads":[],"next_run":null,"offsets":[2,1],"remaining":0},"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression certificate 1\", \"actual\": {\"emitted\": 1, \"offsets\": [1], \"heads\": [[1, 0]], \"exhausted\": [0], \"remaining\": 0, \"next_run\": null}, \"expected\": {\"emitted\": 1, \"offsets\": [1], \"heads\": [], \"exhausted\": [0], \"remaining\": 0, \"next_run\": null}, \"passed\": false}, {\"check\": \"regression certificate 2\", \"actual\": {\"emitted\": 1, \"offsets\": [1, 0], \"heads\": [[1, 0], [2, 1]], \"exhausted\": [], \"remaining\": 3, \"next_run\": 1}, \"expected\": {\"emitted\": 1, \"offsets\": [1, 0], \"heads\": [[2, 1], [3, 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