FA-23846 / Client state / Open access

Prefetched route resource adoption: Subscriber reference count · case 01

Subscriber reference count.

Verified by executionVariant 1 · 60 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The subscriber-reference-count client decision evaluates `len(set(subscribers))` instead of `len(subscribers)`.

VERIFIED REPAIR

Apply the modeled subscriber-reference-count rule: `len(subscribers)`.

Unsuccessful approach: The partial repair `int(bool(subscribers))` still violates the explicit fixture contract.

Case contract

A prefetch handle is keyed by route and build version, has an exclusive expiration deadline, shares pending work, and is adopted only when ready. Consumer registrations are counted, including repeated registrations. Operation subscriber-reference-count has the six explicit input/output oracles below.

Why this case matters

An offline client lifecycle model that isolates a state-management defect without DOM rendering or network services.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(operation, s):
    route, cached_route, version, cached_version, expires, now, status, subscribers = s
    if operation == 'adopt-exact-route-version':
        return route==cached_route and version==cached_version
    if operation == 'expiry-at-boundary':
        return expires is None or now<expires
    if operation == 'ready-resource-adoption':
        return status=='ready'
    if operation == 'pending-resource-sharing':
        return status=='pending' and route==cached_route
    if operation == 'unobserved-cancel':
        return not subscribers and status=='pending'
    if operation == 'subscriber-reference-count':
        return len(set(subscribers))
    if operation == 'failed-prefetch-retry':
        return status=='failed'
    if operation == 'prefetch-promote-consumer':
        return subscribers+['navigation']
    if operation == 'remaining-resource-life':
        return None if expires is None else max(0,expires-now)
    if operation == 'refresh-old-build':
        return version!=cached_version
    raise ValueError('unknown modeled operation')
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('adopt-exact-route-version scenario 1', solve('adopt-exact-route-version', ('/a','/a',N,N,10,9,'ready',['screen'])), True)
check('adopt-exact-route-version scenario 2', solve('adopt-exact-route-version', ('/a','/a',1,1,10,10,'ready',[])), True)
check('adopt-exact-route-version scenario 3', solve('adopt-exact-route-version', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('adopt-exact-route-version scenario 4', solve('adopt-exact-route-version', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('adopt-exact-route-version scenario 5', solve('adopt-exact-route-version', ('/b','/b',1,1,12,10,'failed',[])), True)
check('adopt-exact-route-version scenario 6', solve('adopt-exact-route-version', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), True)
check('expiry-at-boundary scenario 1', solve('expiry-at-boundary', ('/a','/a',N,N,10,9,'ready',['screen'])), True)
check('expiry-at-boundary scenario 2', solve('expiry-at-boundary', ('/a','/a',1,1,10,10,'ready',[])), False)
check('expiry-at-boundary scenario 3', solve('expiry-at-boundary', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), True)
check('expiry-at-boundary scenario 4', solve('expiry-at-boundary', ('/a','/a',2,1,12,10,'pending',['screen'])), True)
check('expiry-at-boundary scenario 5', solve('expiry-at-boundary', ('/b','/b',1,1,12,10,'failed',[])), True)
check('expiry-at-boundary scenario 6', solve('expiry-at-boundary', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), True)
check('ready-resource-adoption scenario 1', solve('ready-resource-adoption', ('/a','/a',N,N,10,9,'ready',['screen'])), True)
check('ready-resource-adoption scenario 2', solve('ready-resource-adoption', ('/a','/a',1,1,10,10,'ready',[])), True)
check('ready-resource-adoption scenario 3', solve('ready-resource-adoption', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), True)
check('ready-resource-adoption scenario 4', solve('ready-resource-adoption', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('ready-resource-adoption scenario 5', solve('ready-resource-adoption', ('/b','/b',1,1,12,10,'failed',[])), False)
check('ready-resource-adoption scenario 6', solve('ready-resource-adoption', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), True)
check('pending-resource-sharing scenario 1', solve('pending-resource-sharing', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('pending-resource-sharing scenario 2', solve('pending-resource-sharing', ('/a','/a',1,1,10,10,'ready',[])), False)
check('pending-resource-sharing scenario 3', solve('pending-resource-sharing', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('pending-resource-sharing scenario 4', solve('pending-resource-sharing', ('/a','/a',2,1,12,10,'pending',['screen'])), True)
check('pending-resource-sharing scenario 5', solve('pending-resource-sharing', ('/b','/b',1,1,12,10,'failed',[])), False)
check('pending-resource-sharing scenario 6', solve('pending-resource-sharing', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
check('unobserved-cancel scenario 1', solve('unobserved-cancel', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('unobserved-cancel scenario 2', solve('unobserved-cancel', ('/a','/a',1,1,10,10,'ready',[])), False)
check('unobserved-cancel scenario 3', solve('unobserved-cancel', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('unobserved-cancel scenario 4', solve('unobserved-cancel', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('unobserved-cancel scenario 5', solve('unobserved-cancel', ('/b','/b',1,1,12,10,'failed',[])), False)
check('unobserved-cancel scenario 6', solve('unobserved-cancel', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
check('subscriber-reference-count scenario 1', solve('subscriber-reference-count', ('/a','/a',N,N,10,9,'ready',['screen'])), 1)
check('subscriber-reference-count scenario 2', solve('subscriber-reference-count', ('/a','/a',1,1,10,10,'ready',[])), 0)
check('subscriber-reference-count scenario 3', solve('subscriber-reference-count', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), 2)
check('subscriber-reference-count scenario 4', solve('subscriber-reference-count', ('/a','/a',2,1,12,10,'pending',['screen'])), 1)
check('subscriber-reference-count scenario 5', solve('subscriber-reference-count', ('/b','/b',1,1,12,10,'failed',[])), 0)
check('subscriber-reference-count scenario 6', solve('subscriber-reference-count', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), 2)
check('failed-prefetch-retry scenario 1', solve('failed-prefetch-retry', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('failed-prefetch-retry scenario 2', solve('failed-prefetch-retry', ('/a','/a',1,1,10,10,'ready',[])), False)
check('failed-prefetch-retry scenario 3', solve('failed-prefetch-retry', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('failed-prefetch-retry scenario 4', solve('failed-prefetch-retry', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('failed-prefetch-retry scenario 5', solve('failed-prefetch-retry', ('/b','/b',1,1,12,10,'failed',[])), True)
check('failed-prefetch-retry scenario 6', solve('failed-prefetch-retry', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
check('prefetch-promote-consumer scenario 1', solve('prefetch-promote-consumer', ('/a','/a',N,N,10,9,'ready',['screen'])), ['screen','navigation'])
check('prefetch-promote-consumer scenario 2', solve('prefetch-promote-consumer', ('/a','/a',1,1,10,10,'ready',[])), ['navigation'])
check('prefetch-promote-consumer scenario 3', solve('prefetch-promote-consumer', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), ['screen','preview','navigation'])
check('prefetch-promote-consumer scenario 4', solve('prefetch-promote-consumer', ('/a','/a',2,1,12,10,'pending',['screen'])), ['screen','navigation'])
check('prefetch-promote-consumer scenario 5', solve('prefetch-promote-consumer', ('/b','/b',1,1,12,10,'failed',[])), ['navigation'])
check('prefetch-promote-consumer scenario 6', solve('prefetch-promote-consumer', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), ['screen','screen','navigation'])
check('remaining-resource-life scenario 1', solve('remaining-resource-life', ('/a','/a',N,N,10,9,'ready',['screen'])), 1)
check('remaining-resource-life scenario 2', solve('remaining-resource-life', ('/a','/a',1,1,10,10,'ready',[])), 0)
check('remaining-resource-life scenario 3', solve('remaining-resource-life', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), 2)
check('remaining-resource-life scenario 4', solve('remaining-resource-life', ('/a','/a',2,1,12,10,'pending',['screen'])), 2)
check('remaining-resource-life scenario 5', solve('remaining-resource-life', ('/b','/b',1,1,12,10,'failed',[])), 2)
check('remaining-resource-life scenario 6', solve('remaining-resource-life', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), None)
check('refresh-old-build scenario 1', solve('refresh-old-build', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('refresh-old-build scenario 2', solve('refresh-old-build', ('/a','/a',1,1,10,10,'ready',[])), False)
check('refresh-old-build scenario 3', solve('refresh-old-build', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('refresh-old-build scenario 4', solve('refresh-old-build', ('/a','/a',2,1,12,10,'pending',['screen'])), True)
check('refresh-old-build scenario 5', solve('refresh-old-build', ('/b','/b',1,1,12,10,'failed',[])), False)
check('refresh-old-build scenario 6', solve('refresh-old-build', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
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 fixture	Actual	Expected	Outcome
adopt-exact-route-version scenario 1	`True`	`True`	Passed
adopt-exact-route-version scenario 2	`True`	`True`	Passed
adopt-exact-route-version scenario 3	`False`	`False`	Passed
adopt-exact-route-version scenario 4	`False`	`False`	Passed
adopt-exact-route-version scenario 5	`True`	`True`	Passed
adopt-exact-route-version scenario 6	`True`	`True`	Passed
expiry-at-boundary scenario 1	`True`	`True`	Passed
expiry-at-boundary scenario 2	`False`	`False`	Passed
expiry-at-boundary scenario 3	`True`	`True`	Passed
expiry-at-boundary scenario 4	`True`	`True`	Passed
expiry-at-boundary scenario 5	`True`	`True`	Passed
expiry-at-boundary scenario 6	`True`	`True`	Passed
ready-resource-adoption scenario 1	`True`	`True`	Passed
ready-resource-adoption scenario 2	`True`	`True`	Passed
ready-resource-adoption scenario 3	`True`	`True`	Passed
ready-resource-adoption scenario 4	`False`	`False`	Passed
ready-resource-adoption scenario 5	`False`	`False`	Passed
ready-resource-adoption scenario 6	`True`	`True`	Passed
pending-resource-sharing scenario 1	`False`	`False`	Passed
pending-resource-sharing scenario 2	`False`	`False`	Passed
pending-resource-sharing scenario 3	`False`	`False`	Passed
pending-resource-sharing scenario 4	`True`	`True`	Passed
pending-resource-sharing scenario 5	`False`	`False`	Passed
pending-resource-sharing scenario 6	`False`	`False`	Passed
unobserved-cancel scenario 1	`False`	`False`	Passed
unobserved-cancel scenario 2	`False`	`False`	Passed
unobserved-cancel scenario 3	`False`	`False`	Passed
unobserved-cancel scenario 4	`False`	`False`	Passed
unobserved-cancel scenario 5	`False`	`False`	Passed
unobserved-cancel scenario 6	`False`	`False`	Passed
subscriber-reference-count scenario 1	`1`	`1`	Passed
subscriber-reference-count scenario 2	`0`	`0`	Passed
subscriber-reference-count scenario 3	`2`	`2`	Passed
subscriber-reference-count scenario 4	`1`	`1`	Passed
subscriber-reference-count scenario 5	`0`	`0`	Passed
subscriber-reference-count scenario 6	`1`	`2`	Failed
failed-prefetch-retry scenario 1	`False`	`False`	Passed
failed-prefetch-retry scenario 2	`False`	`False`	Passed
failed-prefetch-retry scenario 3	`False`	`False`	Passed
failed-prefetch-retry scenario 4	`False`	`False`	Passed
failed-prefetch-retry scenario 5	`True`	`True`	Passed
failed-prefetch-retry scenario 6	`False`	`False`	Passed
prefetch-promote-consumer scenario 1	`['screen', 'navigation']`	`['screen', 'navigation']`	Passed
prefetch-promote-consumer scenario 2	`['navigation']`	`['navigation']`	Passed
prefetch-promote-consumer scenario 3	`['screen', 'preview', 'navigation']`	`['screen', 'preview', 'navigation']`	Passed
prefetch-promote-consumer scenario 4	`['screen', 'navigation']`	`['screen', 'navigation']`	Passed
prefetch-promote-consumer scenario 5	`['navigation']`	`['navigation']`	Passed
prefetch-promote-consumer scenario 6	`['screen', 'screen', 'navigation']`	`['screen', 'screen', 'navigation']`	Passed
remaining-resource-life scenario 1	`1`	`1`	Passed
remaining-resource-life scenario 2	`0`	`0`	Passed
remaining-resource-life scenario 3	`2`	`2`	Passed
remaining-resource-life scenario 4	`2`	`2`	Passed
remaining-resource-life scenario 5	`2`	`2`	Passed
remaining-resource-life scenario 6	`None`	`None`	Passed
refresh-old-build scenario 1	`False`	`False`	Passed
refresh-old-build scenario 2	`False`	`False`	Passed
refresh-old-build scenario 3	`False`	`False`	Passed
refresh-old-build scenario 4	`True`	`True`	Passed
refresh-old-build scenario 5	`False`	`False`	Passed
refresh-old-build scenario 6	`False`	`False`	Passed

SHA-256 / 79ea66a8844104fd963a86dbbea708d62639b3bae4b225bfc53cc6ad51614a35

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(operation, s):
    route, cached_route, version, cached_version, expires, now, status, subscribers = s
    if operation == 'adopt-exact-route-version':
        return route==cached_route and version==cached_version
    if operation == 'expiry-at-boundary':
        return expires is None or now<expires
    if operation == 'ready-resource-adoption':
        return status=='ready'
    if operation == 'pending-resource-sharing':
        return status=='pending' and route==cached_route
    if operation == 'unobserved-cancel':
        return not subscribers and status=='pending'
    if operation == 'subscriber-reference-count':
        return int(bool(subscribers))
    if operation == 'failed-prefetch-retry':
        return status=='failed'
    if operation == 'prefetch-promote-consumer':
        return subscribers+['navigation']
    if operation == 'remaining-resource-life':
        return None if expires is None else max(0,expires-now)
    if operation == 'refresh-old-build':
        return version!=cached_version
    raise ValueError('unknown modeled operation')
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('adopt-exact-route-version scenario 1', solve('adopt-exact-route-version', ('/a','/a',N,N,10,9,'ready',['screen'])), True)
check('adopt-exact-route-version scenario 2', solve('adopt-exact-route-version', ('/a','/a',1,1,10,10,'ready',[])), True)
check('adopt-exact-route-version scenario 3', solve('adopt-exact-route-version', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('adopt-exact-route-version scenario 4', solve('adopt-exact-route-version', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('adopt-exact-route-version scenario 5', solve('adopt-exact-route-version', ('/b','/b',1,1,12,10,'failed',[])), True)
check('adopt-exact-route-version scenario 6', solve('adopt-exact-route-version', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), True)
check('expiry-at-boundary scenario 1', solve('expiry-at-boundary', ('/a','/a',N,N,10,9,'ready',['screen'])), True)
check('expiry-at-boundary scenario 2', solve('expiry-at-boundary', ('/a','/a',1,1,10,10,'ready',[])), False)
check('expiry-at-boundary scenario 3', solve('expiry-at-boundary', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), True)
check('expiry-at-boundary scenario 4', solve('expiry-at-boundary', ('/a','/a',2,1,12,10,'pending',['screen'])), True)
check('expiry-at-boundary scenario 5', solve('expiry-at-boundary', ('/b','/b',1,1,12,10,'failed',[])), True)
check('expiry-at-boundary scenario 6', solve('expiry-at-boundary', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), True)
check('ready-resource-adoption scenario 1', solve('ready-resource-adoption', ('/a','/a',N,N,10,9,'ready',['screen'])), True)
check('ready-resource-adoption scenario 2', solve('ready-resource-adoption', ('/a','/a',1,1,10,10,'ready',[])), True)
check('ready-resource-adoption scenario 3', solve('ready-resource-adoption', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), True)
check('ready-resource-adoption scenario 4', solve('ready-resource-adoption', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('ready-resource-adoption scenario 5', solve('ready-resource-adoption', ('/b','/b',1,1,12,10,'failed',[])), False)
check('ready-resource-adoption scenario 6', solve('ready-resource-adoption', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), True)
check('pending-resource-sharing scenario 1', solve('pending-resource-sharing', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('pending-resource-sharing scenario 2', solve('pending-resource-sharing', ('/a','/a',1,1,10,10,'ready',[])), False)
check('pending-resource-sharing scenario 3', solve('pending-resource-sharing', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('pending-resource-sharing scenario 4', solve('pending-resource-sharing', ('/a','/a',2,1,12,10,'pending',['screen'])), True)
check('pending-resource-sharing scenario 5', solve('pending-resource-sharing', ('/b','/b',1,1,12,10,'failed',[])), False)
check('pending-resource-sharing scenario 6', solve('pending-resource-sharing', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
check('unobserved-cancel scenario 1', solve('unobserved-cancel', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('unobserved-cancel scenario 2', solve('unobserved-cancel', ('/a','/a',1,1,10,10,'ready',[])), False)
check('unobserved-cancel scenario 3', solve('unobserved-cancel', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('unobserved-cancel scenario 4', solve('unobserved-cancel', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('unobserved-cancel scenario 5', solve('unobserved-cancel', ('/b','/b',1,1,12,10,'failed',[])), False)
check('unobserved-cancel scenario 6', solve('unobserved-cancel', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
check('subscriber-reference-count scenario 1', solve('subscriber-reference-count', ('/a','/a',N,N,10,9,'ready',['screen'])), 1)
check('subscriber-reference-count scenario 2', solve('subscriber-reference-count', ('/a','/a',1,1,10,10,'ready',[])), 0)
check('subscriber-reference-count scenario 3', solve('subscriber-reference-count', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), 2)
check('subscriber-reference-count scenario 4', solve('subscriber-reference-count', ('/a','/a',2,1,12,10,'pending',['screen'])), 1)
check('subscriber-reference-count scenario 5', solve('subscriber-reference-count', ('/b','/b',1,1,12,10,'failed',[])), 0)
check('subscriber-reference-count scenario 6', solve('subscriber-reference-count', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), 2)
check('failed-prefetch-retry scenario 1', solve('failed-prefetch-retry', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('failed-prefetch-retry scenario 2', solve('failed-prefetch-retry', ('/a','/a',1,1,10,10,'ready',[])), False)
check('failed-prefetch-retry scenario 3', solve('failed-prefetch-retry', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('failed-prefetch-retry scenario 4', solve('failed-prefetch-retry', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('failed-prefetch-retry scenario 5', solve('failed-prefetch-retry', ('/b','/b',1,1,12,10,'failed',[])), True)
check('failed-prefetch-retry scenario 6', solve('failed-prefetch-retry', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
check('prefetch-promote-consumer scenario 1', solve('prefetch-promote-consumer', ('/a','/a',N,N,10,9,'ready',['screen'])), ['screen','navigation'])
check('prefetch-promote-consumer scenario 2', solve('prefetch-promote-consumer', ('/a','/a',1,1,10,10,'ready',[])), ['navigation'])
check('prefetch-promote-consumer scenario 3', solve('prefetch-promote-consumer', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), ['screen','preview','navigation'])
check('prefetch-promote-consumer scenario 4', solve('prefetch-promote-consumer', ('/a','/a',2,1,12,10,'pending',['screen'])), ['screen','navigation'])
check('prefetch-promote-consumer scenario 5', solve('prefetch-promote-consumer', ('/b','/b',1,1,12,10,'failed',[])), ['navigation'])
check('prefetch-promote-consumer scenario 6', solve('prefetch-promote-consumer', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), ['screen','screen','navigation'])
check('remaining-resource-life scenario 1', solve('remaining-resource-life', ('/a','/a',N,N,10,9,'ready',['screen'])), 1)
check('remaining-resource-life scenario 2', solve('remaining-resource-life', ('/a','/a',1,1,10,10,'ready',[])), 0)
check('remaining-resource-life scenario 3', solve('remaining-resource-life', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), 2)
check('remaining-resource-life scenario 4', solve('remaining-resource-life', ('/a','/a',2,1,12,10,'pending',['screen'])), 2)
check('remaining-resource-life scenario 5', solve('remaining-resource-life', ('/b','/b',1,1,12,10,'failed',[])), 2)
check('remaining-resource-life scenario 6', solve('remaining-resource-life', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), None)
check('refresh-old-build scenario 1', solve('refresh-old-build', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('refresh-old-build scenario 2', solve('refresh-old-build', ('/a','/a',1,1,10,10,'ready',[])), False)
check('refresh-old-build scenario 3', solve('refresh-old-build', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('refresh-old-build scenario 4', solve('refresh-old-build', ('/a','/a',2,1,12,10,'pending',['screen'])), True)
check('refresh-old-build scenario 5', solve('refresh-old-build', ('/b','/b',1,1,12,10,'failed',[])), False)
check('refresh-old-build scenario 6', solve('refresh-old-build', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
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 fixture	Actual	Expected	Outcome
adopt-exact-route-version scenario 1	`True`	`True`	Passed
adopt-exact-route-version scenario 2	`True`	`True`	Passed
adopt-exact-route-version scenario 3	`False`	`False`	Passed
adopt-exact-route-version scenario 4	`False`	`False`	Passed
adopt-exact-route-version scenario 5	`True`	`True`	Passed
adopt-exact-route-version scenario 6	`True`	`True`	Passed
expiry-at-boundary scenario 1	`True`	`True`	Passed
expiry-at-boundary scenario 2	`False`	`False`	Passed
expiry-at-boundary scenario 3	`True`	`True`	Passed
expiry-at-boundary scenario 4	`True`	`True`	Passed
expiry-at-boundary scenario 5	`True`	`True`	Passed
expiry-at-boundary scenario 6	`True`	`True`	Passed
ready-resource-adoption scenario 1	`True`	`True`	Passed
ready-resource-adoption scenario 2	`True`	`True`	Passed
ready-resource-adoption scenario 3	`True`	`True`	Passed
ready-resource-adoption scenario 4	`False`	`False`	Passed
ready-resource-adoption scenario 5	`False`	`False`	Passed
ready-resource-adoption scenario 6	`True`	`True`	Passed
pending-resource-sharing scenario 1	`False`	`False`	Passed
pending-resource-sharing scenario 2	`False`	`False`	Passed
pending-resource-sharing scenario 3	`False`	`False`	Passed
pending-resource-sharing scenario 4	`True`	`True`	Passed
pending-resource-sharing scenario 5	`False`	`False`	Passed
pending-resource-sharing scenario 6	`False`	`False`	Passed
unobserved-cancel scenario 1	`False`	`False`	Passed
unobserved-cancel scenario 2	`False`	`False`	Passed
unobserved-cancel scenario 3	`False`	`False`	Passed
unobserved-cancel scenario 4	`False`	`False`	Passed
unobserved-cancel scenario 5	`False`	`False`	Passed
unobserved-cancel scenario 6	`False`	`False`	Passed
subscriber-reference-count scenario 1	`1`	`1`	Passed
subscriber-reference-count scenario 2	`0`	`0`	Passed
subscriber-reference-count scenario 3	`1`	`2`	Failed
subscriber-reference-count scenario 4	`1`	`1`	Passed
subscriber-reference-count scenario 5	`0`	`0`	Passed
subscriber-reference-count scenario 6	`1`	`2`	Failed
failed-prefetch-retry scenario 1	`False`	`False`	Passed
failed-prefetch-retry scenario 2	`False`	`False`	Passed
failed-prefetch-retry scenario 3	`False`	`False`	Passed
failed-prefetch-retry scenario 4	`False`	`False`	Passed
failed-prefetch-retry scenario 5	`True`	`True`	Passed
failed-prefetch-retry scenario 6	`False`	`False`	Passed
prefetch-promote-consumer scenario 1	`['screen', 'navigation']`	`['screen', 'navigation']`	Passed
prefetch-promote-consumer scenario 2	`['navigation']`	`['navigation']`	Passed
prefetch-promote-consumer scenario 3	`['screen', 'preview', 'navigation']`	`['screen', 'preview', 'navigation']`	Passed
prefetch-promote-consumer scenario 4	`['screen', 'navigation']`	`['screen', 'navigation']`	Passed
prefetch-promote-consumer scenario 5	`['navigation']`	`['navigation']`	Passed
prefetch-promote-consumer scenario 6	`['screen', 'screen', 'navigation']`	`['screen', 'screen', 'navigation']`	Passed
remaining-resource-life scenario 1	`1`	`1`	Passed
remaining-resource-life scenario 2	`0`	`0`	Passed
remaining-resource-life scenario 3	`2`	`2`	Passed
remaining-resource-life scenario 4	`2`	`2`	Passed
remaining-resource-life scenario 5	`2`	`2`	Passed
remaining-resource-life scenario 6	`None`	`None`	Passed
refresh-old-build scenario 1	`False`	`False`	Passed
refresh-old-build scenario 2	`False`	`False`	Passed
refresh-old-build scenario 3	`False`	`False`	Passed
refresh-old-build scenario 4	`True`	`True`	Passed
refresh-old-build scenario 5	`False`	`False`	Passed
refresh-old-build scenario 6	`False`	`False`	Passed

SHA-256 / e0c5ebc60613f72faeaab38a6e211dc7e8d7a7a4317c57fca193961473c621e1

3 / The verified repair

Exit 0

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

N = 1
observations = []
def solve(operation, s):
    route, cached_route, version, cached_version, expires, now, status, subscribers = s
    if operation == 'adopt-exact-route-version':
        return route==cached_route and version==cached_version
    if operation == 'expiry-at-boundary':
        return expires is None or now<expires
    if operation == 'ready-resource-adoption':
        return status=='ready'
    if operation == 'pending-resource-sharing':
        return status=='pending' and route==cached_route
    if operation == 'unobserved-cancel':
        return not subscribers and status=='pending'
    if operation == 'subscriber-reference-count':
        return len(subscribers)
    if operation == 'failed-prefetch-retry':
        return status=='failed'
    if operation == 'prefetch-promote-consumer':
        return subscribers+['navigation']
    if operation == 'remaining-resource-life':
        return None if expires is None else max(0,expires-now)
    if operation == 'refresh-old-build':
        return version!=cached_version
    raise ValueError('unknown modeled operation')
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('adopt-exact-route-version scenario 1', solve('adopt-exact-route-version', ('/a','/a',N,N,10,9,'ready',['screen'])), True)
check('adopt-exact-route-version scenario 2', solve('adopt-exact-route-version', ('/a','/a',1,1,10,10,'ready',[])), True)
check('adopt-exact-route-version scenario 3', solve('adopt-exact-route-version', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('adopt-exact-route-version scenario 4', solve('adopt-exact-route-version', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('adopt-exact-route-version scenario 5', solve('adopt-exact-route-version', ('/b','/b',1,1,12,10,'failed',[])), True)
check('adopt-exact-route-version scenario 6', solve('adopt-exact-route-version', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), True)
check('expiry-at-boundary scenario 1', solve('expiry-at-boundary', ('/a','/a',N,N,10,9,'ready',['screen'])), True)
check('expiry-at-boundary scenario 2', solve('expiry-at-boundary', ('/a','/a',1,1,10,10,'ready',[])), False)
check('expiry-at-boundary scenario 3', solve('expiry-at-boundary', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), True)
check('expiry-at-boundary scenario 4', solve('expiry-at-boundary', ('/a','/a',2,1,12,10,'pending',['screen'])), True)
check('expiry-at-boundary scenario 5', solve('expiry-at-boundary', ('/b','/b',1,1,12,10,'failed',[])), True)
check('expiry-at-boundary scenario 6', solve('expiry-at-boundary', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), True)
check('ready-resource-adoption scenario 1', solve('ready-resource-adoption', ('/a','/a',N,N,10,9,'ready',['screen'])), True)
check('ready-resource-adoption scenario 2', solve('ready-resource-adoption', ('/a','/a',1,1,10,10,'ready',[])), True)
check('ready-resource-adoption scenario 3', solve('ready-resource-adoption', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), True)
check('ready-resource-adoption scenario 4', solve('ready-resource-adoption', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('ready-resource-adoption scenario 5', solve('ready-resource-adoption', ('/b','/b',1,1,12,10,'failed',[])), False)
check('ready-resource-adoption scenario 6', solve('ready-resource-adoption', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), True)
check('pending-resource-sharing scenario 1', solve('pending-resource-sharing', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('pending-resource-sharing scenario 2', solve('pending-resource-sharing', ('/a','/a',1,1,10,10,'ready',[])), False)
check('pending-resource-sharing scenario 3', solve('pending-resource-sharing', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('pending-resource-sharing scenario 4', solve('pending-resource-sharing', ('/a','/a',2,1,12,10,'pending',['screen'])), True)
check('pending-resource-sharing scenario 5', solve('pending-resource-sharing', ('/b','/b',1,1,12,10,'failed',[])), False)
check('pending-resource-sharing scenario 6', solve('pending-resource-sharing', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
check('unobserved-cancel scenario 1', solve('unobserved-cancel', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('unobserved-cancel scenario 2', solve('unobserved-cancel', ('/a','/a',1,1,10,10,'ready',[])), False)
check('unobserved-cancel scenario 3', solve('unobserved-cancel', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('unobserved-cancel scenario 4', solve('unobserved-cancel', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('unobserved-cancel scenario 5', solve('unobserved-cancel', ('/b','/b',1,1,12,10,'failed',[])), False)
check('unobserved-cancel scenario 6', solve('unobserved-cancel', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
check('subscriber-reference-count scenario 1', solve('subscriber-reference-count', ('/a','/a',N,N,10,9,'ready',['screen'])), 1)
check('subscriber-reference-count scenario 2', solve('subscriber-reference-count', ('/a','/a',1,1,10,10,'ready',[])), 0)
check('subscriber-reference-count scenario 3', solve('subscriber-reference-count', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), 2)
check('subscriber-reference-count scenario 4', solve('subscriber-reference-count', ('/a','/a',2,1,12,10,'pending',['screen'])), 1)
check('subscriber-reference-count scenario 5', solve('subscriber-reference-count', ('/b','/b',1,1,12,10,'failed',[])), 0)
check('subscriber-reference-count scenario 6', solve('subscriber-reference-count', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), 2)
check('failed-prefetch-retry scenario 1', solve('failed-prefetch-retry', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('failed-prefetch-retry scenario 2', solve('failed-prefetch-retry', ('/a','/a',1,1,10,10,'ready',[])), False)
check('failed-prefetch-retry scenario 3', solve('failed-prefetch-retry', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('failed-prefetch-retry scenario 4', solve('failed-prefetch-retry', ('/a','/a',2,1,12,10,'pending',['screen'])), False)
check('failed-prefetch-retry scenario 5', solve('failed-prefetch-retry', ('/b','/b',1,1,12,10,'failed',[])), True)
check('failed-prefetch-retry scenario 6', solve('failed-prefetch-retry', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
check('prefetch-promote-consumer scenario 1', solve('prefetch-promote-consumer', ('/a','/a',N,N,10,9,'ready',['screen'])), ['screen','navigation'])
check('prefetch-promote-consumer scenario 2', solve('prefetch-promote-consumer', ('/a','/a',1,1,10,10,'ready',[])), ['navigation'])
check('prefetch-promote-consumer scenario 3', solve('prefetch-promote-consumer', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), ['screen','preview','navigation'])
check('prefetch-promote-consumer scenario 4', solve('prefetch-promote-consumer', ('/a','/a',2,1,12,10,'pending',['screen'])), ['screen','navigation'])
check('prefetch-promote-consumer scenario 5', solve('prefetch-promote-consumer', ('/b','/b',1,1,12,10,'failed',[])), ['navigation'])
check('prefetch-promote-consumer scenario 6', solve('prefetch-promote-consumer', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), ['screen','screen','navigation'])
check('remaining-resource-life scenario 1', solve('remaining-resource-life', ('/a','/a',N,N,10,9,'ready',['screen'])), 1)
check('remaining-resource-life scenario 2', solve('remaining-resource-life', ('/a','/a',1,1,10,10,'ready',[])), 0)
check('remaining-resource-life scenario 3', solve('remaining-resource-life', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), 2)
check('remaining-resource-life scenario 4', solve('remaining-resource-life', ('/a','/a',2,1,12,10,'pending',['screen'])), 2)
check('remaining-resource-life scenario 5', solve('remaining-resource-life', ('/b','/b',1,1,12,10,'failed',[])), 2)
check('remaining-resource-life scenario 6', solve('remaining-resource-life', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), None)
check('refresh-old-build scenario 1', solve('refresh-old-build', ('/a','/a',N,N,10,9,'ready',['screen'])), False)
check('refresh-old-build scenario 2', solve('refresh-old-build', ('/a','/a',1,1,10,10,'ready',[])), False)
check('refresh-old-build scenario 3', solve('refresh-old-build', ('/a','/b',1,1,12,10,'ready',['screen','preview'])), False)
check('refresh-old-build scenario 4', solve('refresh-old-build', ('/a','/a',2,1,12,10,'pending',['screen'])), True)
check('refresh-old-build scenario 5', solve('refresh-old-build', ('/b','/b',1,1,12,10,'failed',[])), False)
check('refresh-old-build scenario 6', solve('refresh-old-build', ('/a','/a',1,1,None,10,'ready',['screen','screen'])), False)
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 fixture	Actual	Expected	Outcome
adopt-exact-route-version scenario 1	`True`	`True`	Passed
adopt-exact-route-version scenario 2	`True`	`True`	Passed
adopt-exact-route-version scenario 3	`False`	`False`	Passed
adopt-exact-route-version scenario 4	`False`	`False`	Passed
adopt-exact-route-version scenario 5	`True`	`True`	Passed
adopt-exact-route-version scenario 6	`True`	`True`	Passed
expiry-at-boundary scenario 1	`True`	`True`	Passed
expiry-at-boundary scenario 2	`False`	`False`	Passed
expiry-at-boundary scenario 3	`True`	`True`	Passed
expiry-at-boundary scenario 4	`True`	`True`	Passed
expiry-at-boundary scenario 5	`True`	`True`	Passed
expiry-at-boundary scenario 6	`True`	`True`	Passed
ready-resource-adoption scenario 1	`True`	`True`	Passed
ready-resource-adoption scenario 2	`True`	`True`	Passed
ready-resource-adoption scenario 3	`True`	`True`	Passed
ready-resource-adoption scenario 4	`False`	`False`	Passed
ready-resource-adoption scenario 5	`False`	`False`	Passed
ready-resource-adoption scenario 6	`True`	`True`	Passed
pending-resource-sharing scenario 1	`False`	`False`	Passed
pending-resource-sharing scenario 2	`False`	`False`	Passed
pending-resource-sharing scenario 3	`False`	`False`	Passed
pending-resource-sharing scenario 4	`True`	`True`	Passed
pending-resource-sharing scenario 5	`False`	`False`	Passed
pending-resource-sharing scenario 6	`False`	`False`	Passed
unobserved-cancel scenario 1	`False`	`False`	Passed
unobserved-cancel scenario 2	`False`	`False`	Passed
unobserved-cancel scenario 3	`False`	`False`	Passed
unobserved-cancel scenario 4	`False`	`False`	Passed
unobserved-cancel scenario 5	`False`	`False`	Passed
unobserved-cancel scenario 6	`False`	`False`	Passed
subscriber-reference-count scenario 1	`1`	`1`	Passed
subscriber-reference-count scenario 2	`0`	`0`	Passed
subscriber-reference-count scenario 3	`2`	`2`	Passed
subscriber-reference-count scenario 4	`1`	`1`	Passed
subscriber-reference-count scenario 5	`0`	`0`	Passed
subscriber-reference-count scenario 6	`2`	`2`	Passed
failed-prefetch-retry scenario 1	`False`	`False`	Passed
failed-prefetch-retry scenario 2	`False`	`False`	Passed
failed-prefetch-retry scenario 3	`False`	`False`	Passed
failed-prefetch-retry scenario 4	`False`	`False`	Passed
failed-prefetch-retry scenario 5	`True`	`True`	Passed
failed-prefetch-retry scenario 6	`False`	`False`	Passed
prefetch-promote-consumer scenario 1	`['screen', 'navigation']`	`['screen', 'navigation']`	Passed
prefetch-promote-consumer scenario 2	`['navigation']`	`['navigation']`	Passed
prefetch-promote-consumer scenario 3	`['screen', 'preview', 'navigation']`	`['screen', 'preview', 'navigation']`	Passed
prefetch-promote-consumer scenario 4	`['screen', 'navigation']`	`['screen', 'navigation']`	Passed
prefetch-promote-consumer scenario 5	`['navigation']`	`['navigation']`	Passed
prefetch-promote-consumer scenario 6	`['screen', 'screen', 'navigation']`	`['screen', 'screen', 'navigation']`	Passed
remaining-resource-life scenario 1	`1`	`1`	Passed
remaining-resource-life scenario 2	`0`	`0`	Passed
remaining-resource-life scenario 3	`2`	`2`	Passed
remaining-resource-life scenario 4	`2`	`2`	Passed
remaining-resource-life scenario 5	`2`	`2`	Passed
remaining-resource-life scenario 6	`None`	`None`	Passed
refresh-old-build scenario 1	`False`	`False`	Passed
refresh-old-build scenario 2	`False`	`False`	Passed
refresh-old-build scenario 3	`False`	`False`	Passed
refresh-old-build scenario 4	`True`	`True`	Passed
refresh-old-build scenario 5	`False`	`False`	Passed
refresh-old-build scenario 6	`False`	`False`	Passed

SHA-256 / 9d95149fb704cbc4c54955ba51b607fd7b8a97b0dc4bf31aae17604e7d7feba4

Verification & scope

Only the explicitly specified operations and finite deterministic records are modeled; no browser or framework 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 2026-09-29T14:40:51.608131+00:00.

Case digest / 901eba31712d190c9524ec5290305a13a1934be3640935262586dabfb58a45c7