{"abstract":"A range member has exactly one separator dash.","category":"HTTP ranges","checks":6,"contract":"Return the two text components for exactly one dash, allowing empty one-sided forms but rejecting both empty. Otherwise None.","contract_signature":"member","evaluation_group":"s3-http_ranges-request-fields","failed_approach":"The partial repair uses p=member.split(\"-\",1)\nreturn p if len(p)==2 else None, which still violates the stated contract.","family":"s3-http_ranges-range-member-dash-count","id":"FA-26656","implementations":{"attempt":{"sha256":"5568c807c11e9de90af13810211b35321cfc7f8e88bc9f8030ef71381ae01d9f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(member):\n    p=member.split(\"-\",1)\n    return p if len(p)==2 else None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-member-dash-count fixture 0', solve(\"0-1-\"+str(N)), None)\ncheck('range-member-dash-count fixture 1', solve(\"-\"), None)\ncheck('range-member-dash-count fixture 2', solve(\"0-\"+str(N)), [\"0\",str(N)])\ncheck('range-member-dash-count fixture 3', solve(\"-\"+str(N)), [\"\",str(N)])\ncheck('range-member-dash-count fixture 4', solve(str(N)+\"-\"), [str(N),\"\"])\ncheck('range-member-dash-count fixture 5', solve(str(N)), None)\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":"dc98404804f92b2243023b83bc5df1283267f3fcb983e4a8f40ab91ab1421eed","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(member):\n    p=member.split(\"-\")\n    return p[:2] if len(p)>=2 else None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-member-dash-count fixture 0', solve(\"0-1-\"+str(N)), None)\ncheck('range-member-dash-count fixture 1', solve(\"-\"), None)\ncheck('range-member-dash-count fixture 2', solve(\"0-\"+str(N)), [\"0\",str(N)])\ncheck('range-member-dash-count fixture 3', solve(\"-\"+str(N)), [\"\",str(N)])\ncheck('range-member-dash-count fixture 4', solve(str(N)+\"-\"), [str(N),\"\"])\ncheck('range-member-dash-count fixture 5', solve(str(N)), None)\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":"Deterministic simplified range service, with stipulated local policies and already parsed trusted inputs; not a complete HTTP implementation. 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-http_ranges-range-member-dash-count","generated_at":"2026-09-29T14:41:17.983427+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Range responses combine representation identity, conditional requests, framing, and partial-object state.","root_cause":"The range-member-dash-count decision uses p=member.split(\"-\")\nreturn p[:2] if len(p)>=2 else None.","sha256":"8233d286586f5fd7da93c0f38d13b79436dbfaf3186540969be75f92dd50b7c8","title":"A range member has exactly one separator dash · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":38.452,"exit_code":1,"observations":[{"actual":["0","1-1"],"check":"range-member-dash-count fixture 0","expected":null,"passed":false},{"actual":["",""],"check":"range-member-dash-count fixture 1","expected":null,"passed":false},{"actual":["0","1"],"check":"range-member-dash-count fixture 2","expected":["0","1"],"passed":true},{"actual":["","1"],"check":"range-member-dash-count fixture 3","expected":["","1"],"passed":true},{"actual":["1",""],"check":"range-member-dash-count fixture 4","expected":["1",""],"passed":true},{"actual":null,"check":"range-member-dash-count fixture 5","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-member-dash-count fixture 0\", \"actual\": [\"0\", \"1-1\"], \"expected\": null, \"passed\": false}, {\"check\": \"range-member-dash-count fixture 1\", \"actual\": [\"\", \"\"], \"expected\": null, \"passed\": false}, {\"check\": \"range-member-dash-count fixture 2\", \"actual\": [\"0\", \"1\"], \"expected\": [\"0\", \"1\"], \"passed\": true}, {\"check\": \"range-member-dash-count fixture 3\", \"actual\": [\"\", \"1\"], \"expected\": [\"\", \"1\"], \"passed\": true}, {\"check\": \"range-member-dash-count fixture 4\", \"actual\": [\"1\", \"\"], \"expected\": [\"1\", \"\"], \"passed\": true}, {\"check\": \"range-member-dash-count fixture 5\", \"actual\": null, \"expected\": null, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.765,"exit_code":1,"observations":[{"actual":["0","1"],"check":"range-member-dash-count fixture 0","expected":null,"passed":false},{"actual":["",""],"check":"range-member-dash-count fixture 1","expected":null,"passed":false},{"actual":["0","1"],"check":"range-member-dash-count fixture 2","expected":["0","1"],"passed":true},{"actual":["","1"],"check":"range-member-dash-count fixture 3","expected":["","1"],"passed":true},{"actual":["1",""],"check":"range-member-dash-count fixture 4","expected":["1",""],"passed":true},{"actual":null,"check":"range-member-dash-count fixture 5","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-member-dash-count fixture 0\", \"actual\": [\"0\", \"1\"], \"expected\": null, \"passed\": false}, {\"check\": \"range-member-dash-count fixture 1\", \"actual\": [\"\", \"\"], \"expected\": null, \"passed\": false}, {\"check\": \"range-member-dash-count fixture 2\", \"actual\": [\"0\", \"1\"], \"expected\": [\"0\", \"1\"], \"passed\": true}, {\"check\": \"range-member-dash-count fixture 3\", \"actual\": [\"\", \"1\"], \"expected\": [\"\", \"1\"], \"passed\": true}, {\"check\": \"range-member-dash-count fixture 4\", \"actual\": [\"1\", \"\"], \"expected\": [\"1\", \"\"], \"passed\": true}, {\"check\": \"range-member-dash-count fixture 5\", \"actual\": null, \"expected\": null, \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}