FA-32551 / Menu interactions / Open access

A valid zero-valued parent is interpreted as a menu root · case 01

A valid zero-valued parent is interpreted as a menu root.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The submenu-definition model applies `[x['id'] for x in p]` at its roots operation instead of the stipulated transformation.

THE FAILURE

The submenu-definition model applies `[x['id'] for x in p]` at its roots operation instead of the stipulated transformation.

Unsuccessful approach: The attempted repair `[x['id'] for x in p if not x['parent']]` still violates the roots oracle.

Case contract

Menu definitions validate presentation identity separately from semantic command identity. Split-menu defaults belong to immediate command children; ancestry and depth remain bounded.

Why this case matters

Cascading and context menus require coherent command and session state as content changes.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import math
import unicodedata
N = 1
observations = []
def solve(action, p):
    if action == 'roots':
        return [x['id'] for x in p]
    if action == 'children':
        return [x['id'] for x in p['nodes'] if x['parent']==p['parent']]
    if action == 'split-default':
        return p['default'] in [x['command'] for x in p['children'] if x['kind']=='command']
    if action == 'self-cycle':
        return any(x['id']==x['parent'] for x in p)
    if action == 'presentation-ids':
        return len({x['row'] for x in p})==len(p)
    if action == 'depth-budget':
        return p['depth']+p['incoming']<=p['limit']
    return {'error': 'unsupported menu operation'}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('roots contract', solve('roots', [{'id':0,'parent':None},{'id':N,'parent':0}]), [0])
check('children contract', solve('children', {'parent':'a','nodes':[{'id':N,'parent':'a'},{'id':N+1,'parent':'b'}]}), [N])
check('split-default contract', solve('split-default', {'default':'remote'+str(N),'registry':['remote'+str(N)],'children':[{'kind':'submenu','descendants':['remote'+str(N)]}]}), False)
check('self-cycle contract', solve('self-cycle', [{'id':N,'parent':N},{'id':N+1,'parent':None}]), True)
check('presentation-ids contract', solve('presentation-ids', [{'row':N,'command':'copy','label':'Copy'},{'row':N+1,'command':'copy','label':'Copy'}]), True)
check('depth-budget contract', solve('depth-budget', {'depth':N+2,'incoming':4,'limit':N+4}), False)
check('unknown operation', solve('unknown', {}), {'error': 'unsupported menu operation'})
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
roots contract	`[0, 1]`	`[0]`	Failed
children contract	`[1]`	`[1]`	Passed
split-default contract	`False`	`False`	Passed
self-cycle contract	`True`	`True`	Passed
presentation-ids contract	`True`	`True`	Passed
depth-budget contract	`False`	`False`	Passed
unknown operation	`{'error': 'unsupported menu operation'}`	`{'error': 'unsupported menu operation'}`	Passed

SHA-256 / 8e34db7d02ac2c6c222edd7b663c258e068df237db97538c70f20917c4c24067

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import math
import unicodedata
N = 1
observations = []
def solve(action, p):
    if action == 'roots':
        return [x['id'] for x in p if not x['parent']]
    if action == 'children':
        return [x['id'] for x in p['nodes'] if x['parent']==p['parent']]
    if action == 'split-default':
        return p['default'] in [x['command'] for x in p['children'] if x['kind']=='command']
    if action == 'self-cycle':
        return any(x['id']==x['parent'] for x in p)
    if action == 'presentation-ids':
        return len({x['row'] for x in p})==len(p)
    if action == 'depth-budget':
        return p['depth']+p['incoming']<=p['limit']
    return {'error': 'unsupported menu operation'}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('roots contract', solve('roots', [{'id':0,'parent':None},{'id':N,'parent':0}]), [0])
check('children contract', solve('children', {'parent':'a','nodes':[{'id':N,'parent':'a'},{'id':N+1,'parent':'b'}]}), [N])
check('split-default contract', solve('split-default', {'default':'remote'+str(N),'registry':['remote'+str(N)],'children':[{'kind':'submenu','descendants':['remote'+str(N)]}]}), False)
check('self-cycle contract', solve('self-cycle', [{'id':N,'parent':N},{'id':N+1,'parent':None}]), True)
check('presentation-ids contract', solve('presentation-ids', [{'row':N,'command':'copy','label':'Copy'},{'row':N+1,'command':'copy','label':'Copy'}]), True)
check('depth-budget contract', solve('depth-budget', {'depth':N+2,'incoming':4,'limit':N+4}), False)
check('unknown operation', solve('unknown', {}), {'error': 'unsupported menu operation'})
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
roots contract	`[0, 1]`	`[0]`	Failed
children contract	`[1]`	`[1]`	Passed
split-default contract	`False`	`False`	Passed
self-cycle contract	`True`	`True`	Passed
presentation-ids contract	`True`	`True`	Passed
depth-budget contract	`False`	`False`	Passed
unknown operation	`{'error': 'unsupported menu operation'}`	`{'error': 'unsupported menu operation'}`	Passed

SHA-256 / 6be00caaf2232d60220ae4eb89c66855ed1263e0cbd060ac2acc3d22f84007d8

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 7 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.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

Verification & scope

Offline supplied-valid-payload model; excludes DOM, keyboard, focus, selection, announcements and browser conformance. 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 2026-09-29T14:42:13.557417+00:00.

Case digest / 6e6fe1f371d0670e9993aab80897f5904c9964b960aee1ec47f9ba5f1030315f