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FA-25216 / Filter interfaces / Open access

Facet leaf labels show only the final segment and name the root · case 01

Facet leaf labels show only the final segment and name the root is violated by the widget projection.

Verified by executionVariant 1 · 10 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The leaf-label decision uses `d['path'][0] if d['path'] else '(root)'` instead of the stipulated hierarchical-facet projection.

THE FAILURE

The leaf-label decision uses `d['path'][0] if d['path'] else '(root)'` instead of the stipulated hierarchical-facet projection.

Unsuccessful approach: The attempted correction `'/'.join(d['path'])` still violates the explicit contract fixtures.

Case contract

Hierarchical facet identities are path tuples. Breadcrumb display, sibling scoping and subtree indicators operate on path segments rather than string prefixes. This example checks: Facet leaf labels show only the final segment and name the root.

Why this case matters

Filter-widget state and serialization must preserve user constraints while the view changes.

1 / The failure

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

N = 1
observations = []
def solve(d):
    return {'breadcrumb':(' / '.join(d['path'])), 'ancestor':(len(d['candidate'])<len(d['path']) and d['path'][:len(d['candidate'])]==d['candidate']), 'sibling':(len(d['path'])==len(d['candidate']) and d['path'][:-1]==d['candidate'][:-1] and d['path']!=d['candidate']), 'leaf-label':(d['path'][0] if d['path'] else '(root)'), 'up-navigation':(d['path'][:-1]), 'same-leaf':(d['path']==d['candidate'])}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'path': ['a', 'b'], 'candidate': []}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': [], 'candidate': ['b', 'a']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': ['a', 'b']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': ['ab']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': True, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': ['a']}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': ['b', 'a']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': []}, {'breadcrumb': 'b / a', 'ancestor': True, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['a', 'b']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['ab']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['a']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': True, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False})], 2: [({'path': ['a', 'b'], 'candidate': ['a']}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': ['ab']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['a']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['b', 'a']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': True}), ({'path': ['ab'], 'candidate': []}, {'breadcrumb': 'ab', 'ancestor': True, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['a', 'b']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['ab']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': True}), ({'path': [], 'candidate': ['a']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': [], 'candidate': ['b', 'a']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': []}, {'breadcrumb': 'a', 'ancestor': True, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False})], 3: [({'path': ['a', 'b'], 'candidate': ['a', 'b']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': True}), ({'path': ['a', 'b'], 'candidate': ['ab']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['a']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': True, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['b', 'a']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': [], 'candidate': []}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': True}), ({'path': [], 'candidate': ['a', 'b']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': [], 'candidate': ['ab']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': ['a']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': True}), ({'path': ['a'], 'candidate': ['b', 'a']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': []}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False})], 4: [({'path': ['a', 'b'], 'candidate': ['b', 'a']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['a', 'b']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': [], 'candidate': ['b', 'a']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': []}, {'breadcrumb': 'a', 'ancestor': True, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': ['a', 'b']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': ['ab']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': True, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': ['a']}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': []}, {'breadcrumb': 'b / a', 'ancestor': True, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['ab']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['a']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': True, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False})], 5: [({'path': ['a', 'b'], 'candidate': ['ab']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': [], 'candidate': []}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': True}), ({'path': ['a', 'b'], 'candidate': []}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': ['a', 'b']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': True}), ({'path': ['b', 'a'], 'candidate': ['a']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['b', 'a']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': True}), ({'path': ['ab'], 'candidate': []}, {'breadcrumb': 'ab', 'ancestor': True, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['a', 'b']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['ab']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': True}), ({'path': [], 'candidate': ['a']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False})]}
for index, (data, expected) in enumerate(fixtures[N]):
    check("contract fixture " + str(index), solve(data), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
contract fixture 0{'ancestor': True, 'breadcrumb': 'a / b', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}{'ancestor': True, 'breadcrumb': 'a / b', 'leaf-label': 'b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}Failed
contract fixture 1{'ancestor': False, 'breadcrumb': '', 'leaf-label': '(root)', 'same-leaf': False, 'sibling': False, 'up-navigation': []}{'ancestor': False, 'breadcrumb': '', 'leaf-label': '(root)', 'same-leaf': False, 'sibling': False, 'up-navigation': []}Passed
contract fixture 2{'ancestor': False, 'breadcrumb': 'a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': []}{'ancestor': False, 'breadcrumb': 'a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': []}Passed
contract fixture 3{'ancestor': False, 'breadcrumb': 'a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': True, 'up-navigation': []}{'ancestor': False, 'breadcrumb': 'a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': True, 'up-navigation': []}Passed
contract fixture 4{'ancestor': True, 'breadcrumb': 'a / b', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}{'ancestor': True, 'breadcrumb': 'a / b', 'leaf-label': 'b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}Failed
contract fixture 5{'ancestor': False, 'breadcrumb': 'a / b', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}{'ancestor': False, 'breadcrumb': 'a / b', 'leaf-label': 'b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}Failed
contract fixture 6{'ancestor': True, 'breadcrumb': 'b / a', 'leaf-label': 'b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}{'ancestor': True, 'breadcrumb': 'b / a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}Failed
contract fixture 7{'ancestor': False, 'breadcrumb': 'b / a', 'leaf-label': 'b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}{'ancestor': False, 'breadcrumb': 'b / a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}Failed
contract fixture 8{'ancestor': False, 'breadcrumb': 'b / a', 'leaf-label': 'b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}{'ancestor': False, 'breadcrumb': 'b / a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}Failed
contract fixture 9{'ancestor': False, 'breadcrumb': 'ab', 'leaf-label': 'ab', 'same-leaf': False, 'sibling': True, 'up-navigation': []}{'ancestor': False, 'breadcrumb': 'ab', 'leaf-label': 'ab', 'same-leaf': False, 'sibling': True, 'up-navigation': []}Passed

SHA-256 / 8b158d241ecd1205ead7794e346eb3f2b91771876ae0fb3a695b87e18c9d4d55

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(d):
    return {'breadcrumb':(' / '.join(d['path'])), 'ancestor':(len(d['candidate'])<len(d['path']) and d['path'][:len(d['candidate'])]==d['candidate']), 'sibling':(len(d['path'])==len(d['candidate']) and d['path'][:-1]==d['candidate'][:-1] and d['path']!=d['candidate']), 'leaf-label':('/'.join(d['path'])), 'up-navigation':(d['path'][:-1]), 'same-leaf':(d['path']==d['candidate'])}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'path': ['a', 'b'], 'candidate': []}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': [], 'candidate': ['b', 'a']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': ['a', 'b']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': ['ab']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': True, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': ['a']}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': ['b', 'a']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': []}, {'breadcrumb': 'b / a', 'ancestor': True, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['a', 'b']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['ab']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['a']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': True, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False})], 2: [({'path': ['a', 'b'], 'candidate': ['a']}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': ['ab']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['a']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['b', 'a']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': True}), ({'path': ['ab'], 'candidate': []}, {'breadcrumb': 'ab', 'ancestor': True, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['a', 'b']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['ab']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': True}), ({'path': [], 'candidate': ['a']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': [], 'candidate': ['b', 'a']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': []}, {'breadcrumb': 'a', 'ancestor': True, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False})], 3: [({'path': ['a', 'b'], 'candidate': ['a', 'b']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': True}), ({'path': ['a', 'b'], 'candidate': ['ab']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['a']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': True, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['b', 'a']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': [], 'candidate': []}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': True}), ({'path': [], 'candidate': ['a', 'b']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': [], 'candidate': ['ab']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': ['a']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': True}), ({'path': ['a'], 'candidate': ['b', 'a']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': []}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False})], 4: [({'path': ['a', 'b'], 'candidate': ['b', 'a']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['a', 'b']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': [], 'candidate': ['b', 'a']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': []}, {'breadcrumb': 'a', 'ancestor': True, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': ['a', 'b']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a'], 'candidate': ['ab']}, {'breadcrumb': 'a', 'ancestor': False, 'sibling': True, 'leaf-label': 'a', 'up-navigation': [], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': ['a']}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': []}, {'breadcrumb': 'b / a', 'ancestor': True, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['ab']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['a']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': True, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False})], 5: [({'path': ['a', 'b'], 'candidate': ['ab']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': [], 'candidate': []}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': True}), ({'path': ['a', 'b'], 'candidate': []}, {'breadcrumb': 'a / b', 'ancestor': True, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': False}), ({'path': ['a', 'b'], 'candidate': ['a', 'b']}, {'breadcrumb': 'a / b', 'ancestor': False, 'sibling': False, 'leaf-label': 'b', 'up-navigation': ['a'], 'same-leaf': True}), ({'path': ['b', 'a'], 'candidate': ['a']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': False}), ({'path': ['b', 'a'], 'candidate': ['b', 'a']}, {'breadcrumb': 'b / a', 'ancestor': False, 'sibling': False, 'leaf-label': 'a', 'up-navigation': ['b'], 'same-leaf': True}), ({'path': ['ab'], 'candidate': []}, {'breadcrumb': 'ab', 'ancestor': True, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['a', 'b']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': False}), ({'path': ['ab'], 'candidate': ['ab']}, {'breadcrumb': 'ab', 'ancestor': False, 'sibling': False, 'leaf-label': 'ab', 'up-navigation': [], 'same-leaf': True}), ({'path': [], 'candidate': ['a']}, {'breadcrumb': '', 'ancestor': False, 'sibling': False, 'leaf-label': '(root)', 'up-navigation': [], 'same-leaf': False})]}
for index, (data, expected) in enumerate(fixtures[N]):
    check("contract fixture " + str(index), solve(data), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
contract fixture 0{'ancestor': True, 'breadcrumb': 'a / b', 'leaf-label': 'a/b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}{'ancestor': True, 'breadcrumb': 'a / b', 'leaf-label': 'b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}Failed
contract fixture 1{'ancestor': False, 'breadcrumb': '', 'leaf-label': '', 'same-leaf': False, 'sibling': False, 'up-navigation': []}{'ancestor': False, 'breadcrumb': '', 'leaf-label': '(root)', 'same-leaf': False, 'sibling': False, 'up-navigation': []}Failed
contract fixture 2{'ancestor': False, 'breadcrumb': 'a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': []}{'ancestor': False, 'breadcrumb': 'a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': []}Passed
contract fixture 3{'ancestor': False, 'breadcrumb': 'a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': True, 'up-navigation': []}{'ancestor': False, 'breadcrumb': 'a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': True, 'up-navigation': []}Passed
contract fixture 4{'ancestor': True, 'breadcrumb': 'a / b', 'leaf-label': 'a/b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}{'ancestor': True, 'breadcrumb': 'a / b', 'leaf-label': 'b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}Failed
contract fixture 5{'ancestor': False, 'breadcrumb': 'a / b', 'leaf-label': 'a/b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}{'ancestor': False, 'breadcrumb': 'a / b', 'leaf-label': 'b', 'same-leaf': False, 'sibling': False, 'up-navigation': ['a']}Failed
contract fixture 6{'ancestor': True, 'breadcrumb': 'b / a', 'leaf-label': 'b/a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}{'ancestor': True, 'breadcrumb': 'b / a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}Failed
contract fixture 7{'ancestor': False, 'breadcrumb': 'b / a', 'leaf-label': 'b/a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}{'ancestor': False, 'breadcrumb': 'b / a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}Failed
contract fixture 8{'ancestor': False, 'breadcrumb': 'b / a', 'leaf-label': 'b/a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}{'ancestor': False, 'breadcrumb': 'b / a', 'leaf-label': 'a', 'same-leaf': False, 'sibling': False, 'up-navigation': ['b']}Failed
contract fixture 9{'ancestor': False, 'breadcrumb': 'ab', 'leaf-label': 'ab', 'same-leaf': False, 'sibling': True, 'up-navigation': []}{'ancestor': False, 'breadcrumb': 'ab', 'leaf-label': 'ab', 'same-leaf': False, 'sibling': True, 'up-navigation': []}Passed

SHA-256 / 9e8d4fe2b70ae435ccc86bddb5af4a0b8a5b236007a66f04310744b931a99423

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 10 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.

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Verification & scope

Deterministic bounded UI-state model only; no browser, query engine, network, or production-standard conformance is claimed. 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 2026-09-29T14:41:04.586705+00:00.

Case digest / 66894906e3961cc345915b4cbe721a06059abda6ff32aa1c0b4fc96b5bcac0d8