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FA-9346 / Dependency resolution / Open access

Release candidate selection: Versions below the required minimum are selected · case 01

Versions below the required minimum are selected.

Verified by executionVariant 1 · 18 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The implementation substitutes True for r['version'] >= minimum, so versions below the required minimum are selected.

THE FAILURE

The implementation substitutes True for r['version'] >= minimum, so versions below the required minimum are selected.

Unsuccessful approach: The attempted repair substitutes r['version'] > minimum. Fixture 9 still yields None instead of (2, 0).

Case contract

Choose the greatest compatible version; exclude yanked, prerelease, wrong-platform and below-minimum candidates. Return None if no candidates remain. Versions are integer tuples.

Why this case matters

An offline model of release candidate selection, suitable for testing build and release tooling without external services.

1 / The failure

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

N = 1
observations = []
def solve(releases, minimum, platform):
    items = [r for r in releases if not r['yanked']]
    items = [r for r in items if not r['pre']]
    items = [r for r in items if r['platform'] in [platform, 'any']]
    items = [r for r in items if True]
    return max((r['version'] for r in items), default=None)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve([], (0, 0), 'linux'), None)
check('fixture 2', solve([], (0, 0), 'win'), None)
check('fixture 3', solve([], (2, 0), 'linux'), None)
check('fixture 4', solve([], (2, 0), 'win'), None)
check('fixture 5', solve([], (6, 0), 'linux'), None)
check('fixture 6', solve([], (6, 0), 'win'), None)
check('fixture 7', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (0, 0), 'linux'), (2, 0))
check('fixture 8', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (0, 0), 'win'), (5, 0))
check('fixture 9', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (2, 0), 'linux'), (2, 0))
check('fixture 10', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (2, 0), 'win'), (5, 0))
check('fixture 11', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (6, 0), 'linux'), None)
check('fixture 12', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (6, 0), 'win'), None)
check('fixture 13', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (0, 0), 'linux'), (2, 0))
check('fixture 14', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (0, 0), 'win'), (2, 0))
check('fixture 15', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (2, 0), 'linux'), (2, 0))
check('fixture 16', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (2, 0), 'win'), (2, 0))
check('fixture 17', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (6, 0), 'linux'), None)
check('fixture 18', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (6, 0), 'win'), None)
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
fixture 1NoneNonePassed
fixture 2NoneNonePassed
fixture 3NoneNonePassed
fixture 4NoneNonePassed
fixture 5NoneNonePassed
fixture 6NoneNonePassed
fixture 7[2, 0][2, 0]Passed
fixture 8[5, 0][5, 0]Passed
fixture 9[2, 0][2, 0]Passed
fixture 10[5, 0][5, 0]Passed
fixture 11[2, 0]NoneFailed
fixture 12[5, 0]NoneFailed
fixture 13[2, 0][2, 0]Passed
fixture 14[2, 0][2, 0]Passed
fixture 15[2, 0][2, 0]Passed
fixture 16[2, 0][2, 0]Passed
fixture 17[2, 0]NoneFailed
fixture 18[2, 0]NoneFailed

SHA-256 / d3fe4b036572b5ec0bb1d0e9965414bf6ded1bb2fd5e1eea14f5baf3638c2e29

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(releases, minimum, platform):
    items = [r for r in releases if not r['yanked']]
    items = [r for r in items if not r['pre']]
    items = [r for r in items if r['platform'] in [platform, 'any']]
    items = [r for r in items if r['version'] > minimum]
    return max((r['version'] for r in items), default=None)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve([], (0, 0), 'linux'), None)
check('fixture 2', solve([], (0, 0), 'win'), None)
check('fixture 3', solve([], (2, 0), 'linux'), None)
check('fixture 4', solve([], (2, 0), 'win'), None)
check('fixture 5', solve([], (6, 0), 'linux'), None)
check('fixture 6', solve([], (6, 0), 'win'), None)
check('fixture 7', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (0, 0), 'linux'), (2, 0))
check('fixture 8', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (0, 0), 'win'), (5, 0))
check('fixture 9', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (2, 0), 'linux'), (2, 0))
check('fixture 10', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (2, 0), 'win'), (5, 0))
check('fixture 11', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (6, 0), 'linux'), None)
check('fixture 12', solve([{'version': (1, 0), 'yanked': False, 'pre': False, 'platform': 'any'}, {'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'linux'}, {'version': (3, 0), 'yanked': True, 'pre': False, 'platform': 'linux'}, {'version': (4, 0), 'yanked': False, 'pre': True, 'platform': 'linux'}, {'version': (5, 0), 'yanked': False, 'pre': False, 'platform': 'win'}], (6, 0), 'win'), None)
check('fixture 13', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (0, 0), 'linux'), (2, 0))
check('fixture 14', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (0, 0), 'win'), (2, 0))
check('fixture 15', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (2, 0), 'linux'), (2, 0))
check('fixture 16', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (2, 0), 'win'), (2, 0))
check('fixture 17', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (6, 0), 'linux'), None)
check('fixture 18', solve([{'version': (2, 0), 'yanked': False, 'pre': False, 'platform': 'any'}], (6, 0), 'win'), None)
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
fixture 1NoneNonePassed
fixture 2NoneNonePassed
fixture 3NoneNonePassed
fixture 4NoneNonePassed
fixture 5NoneNonePassed
fixture 6NoneNonePassed
fixture 7[2, 0][2, 0]Passed
fixture 8[5, 0][5, 0]Passed
fixture 9None[2, 0]Failed
fixture 10[5, 0][5, 0]Passed
fixture 11NoneNonePassed
fixture 12NoneNonePassed
fixture 13[2, 0][2, 0]Passed
fixture 14[2, 0][2, 0]Passed
fixture 15None[2, 0]Failed
fixture 16None[2, 0]Failed
fixture 17NoneNonePassed
fixture 18NoneNonePassed

SHA-256 / 61c87fc018c646eee1d87bfee76dfcd822518e24487c8f4720640adba42d2eae

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 18 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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Verification & scope

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 2026-09-29T14:38:29.197649+00:00.

Case digest / b81d2d3a8a58e8b6f8ca0355dbbebca7d035913c019b657a1adc374ee9680b89