FAILURE MAP
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FA-21751 / Assistive announcements / Open access

Immutable speech bundle accepts a late fragment · case 01

The announcement trace violates the stated utterance-bundle contract.

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

ROOT CAUSE

Fault site: if e[0]=='part' and not sealed: parts.append([e[2],e[3]]) is implemented as if e[0]=='part': parts.append([e[2],e[3]])

THE FAILURE

Fault site: if e[0]=='part' and not sealed: parts.append([e[2],e[3]]) is implemented as if e[0]=='part': parts.append([e[2],e[3]])

Unsuccessful approach: The attempted repair substitutes if e[0]=='part' and not sealed: parts.insert(0,[e[2],e[3]]) and still violates a regression oracle.

Case contract

Bundles are atomic ordered speech segments. Open initializes unsealed bundle; part appends [label,text] while unsealed; replace edits matching label only. Seal marks immutable. Dispatch requires sealed and nonempty, emits a single joined label:text string, removes bundle and records delivered ID. Reopen delivered ID clears delivery receipt. Retract drops bundle and receipt. Rename updates label preserving text. Limit truncates number of pending segments from end. Return speech and pending bundle segments/sealed status.

Why this case matters

Deterministic controlled model of assistive announcement delivery.

1 / The failure

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

N = 1
observations = []
def solve(events):
    bundles={}; delivered=set(); out=[]
    for e in events:
        if e[0]=='open': bundles[e[1]]=[[],False]; delivered.discard(e[1])
        elif e[0]=='retract': bundles.pop(e[1],None); delivered.discard(e[1])
        elif len(e)>1 and e[1] in bundles:
            parts,sealed=bundles[e[1]]
            if e[0]=='part': parts.append([e[2],e[3]])
            elif e[0]=='replace' and not sealed:
                for p in parts:
                    if p[0]==e[2]: p[1]=e[3]
            elif e[0]=='rename' and not sealed:
                for p in parts:
                    if p[0]==e[2]: p[0]=e[3]
            elif e[0]=='limit' and not sealed: del parts[max(0,e[2]):]
            elif e[0]=='seal': bundles[e[1]][1]=True
            elif e[0]=='dispatch':
                if not sealed or not parts: continue
                if e[1] in delivered: continue
                out.append(' | '.join(label+': '+text for label,text in parts))
                delivered.add(e[1]); del bundles[e[1]]
    return [out,[[k,v[0],v[1]] for k,v in bundles.items()],sorted(delivered)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = ["[['open','a'],['part','a','Name','A'*N],['part','a','Count','2'],['replace','a','Name','New'],['rename','a','Count','Total'],['seal','a'],['dispatch','a']]", "[['open','a'],['part','a','One','x'*N],['seal','a'],['part','a','Late','no'],['seal','a'],['dispatch','a']]", "[['open','a'],['part','a','One','x'*N],['part','a','Two','y'],['part','a','Three','z'],['limit','a',2],['seal','a'],['dispatch','a']]", "[['open','a'],['part','a','One','x'*N],['seal','a'],['dispatch','a'],['open','a'],['part','a','Again','y'],['seal','a'],['dispatch','a']]", "[['open','a'],['part','a','One','x'*N],['seal','a'],['dispatch','a'],['open','b'],['part','b','Two','y'],['retract','b']]", "[['open','a'],['part','a','Partial','x'*N],['dispatch','a'],['open','b'],['seal','b'],['dispatch','b']]", "[['open','a'],['part','a','Old','x'*N],['open','a']]"]
expected = {1: [[['Name: New | Total: 2'], [], ['a']], [['One: x'], [], ['a']], [['One: x | Two: y'], [], ['a']], [['One: x', 'Again: y'], [], ['a']], [['One: x'], [], ['a']], [[], [['a', [['Partial', 'x']], False], ['b', [], True]], []], [[], [['a', [], False]], []]], 2: [[['Name: New | Total: 2'], [], ['a']], [['One: xx'], [], ['a']], [['One: xx | Two: y'], [], ['a']], [['One: xx', 'Again: y'], [], ['a']], [['One: xx'], [], ['a']], [[], [['a', [['Partial', 'xx']], False], ['b', [], True]], []], [[], [['a', [], False]], []]], 3: [[['Name: New | Total: 2'], [], ['a']], [['One: xxx'], [], ['a']], [['One: xxx | Two: y'], [], ['a']], [['One: xxx', 'Again: y'], [], ['a']], [['One: xxx'], [], ['a']], [[], [['a', [['Partial', 'xxx']], False], ['b', [], True]], []], [[], [['a', [], False]], []]], 4: [[['Name: New | Total: 2'], [], ['a']], [['One: xxxx'], [], ['a']], [['One: xxxx | Two: y'], [], ['a']], [['One: xxxx', 'Again: y'], [], ['a']], [['One: xxxx'], [], ['a']], [[], [['a', [['Partial', 'xxxx']], False], ['b', [], True]], []], [[], [['a', [], False]], []]], 5: [[['Name: New | Total: 2'], [], ['a']], [['One: xxxxx'], [], ['a']], [['One: xxxxx | Two: y'], [], ['a']], [['One: xxxxx', 'Again: y'], [], ['a']], [['One: xxxxx'], [], ['a']], [[], [['a', [['Partial', 'xxxxx']], False], ['b', [], True]], []], [[], [['a', [], False]], []]]}[N]
for i, expression in enumerate(fixtures):
    check("trace-"+str(i+1), solve(eval(expression)), expected[i])
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
trace-1[['Name: New | Total: 2'], [], ['a']][['Name: New | Total: 2'], [], ['a']]Passed
trace-2[['One: x | Late: no'], [], ['a']][['One: x'], [], ['a']]Failed
trace-3[['One: x | Two: y'], [], ['a']][['One: x | Two: y'], [], ['a']]Passed
trace-4[['One: x', 'Again: y'], [], ['a']][['One: x', 'Again: y'], [], ['a']]Passed
trace-5[['One: x'], [], ['a']][['One: x'], [], ['a']]Passed
trace-6[[], [['a', [['Partial', 'x']], False], ['b', [], True]], []][[], [['a', [['Partial', 'x']], False], ['b', [], True]], []]Passed
trace-7[[], [['a', [], False]], []][[], [['a', [], False]], []]Passed

SHA-256 / d71e1ef330ccd68e8521e1d1544513018472e41dc9950d8fce84398463d88ac2

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(events):
    bundles={}; delivered=set(); out=[]
    for e in events:
        if e[0]=='open': bundles[e[1]]=[[],False]; delivered.discard(e[1])
        elif e[0]=='retract': bundles.pop(e[1],None); delivered.discard(e[1])
        elif len(e)>1 and e[1] in bundles:
            parts,sealed=bundles[e[1]]
            if e[0]=='part' and not sealed: parts.insert(0,[e[2],e[3]])
            elif e[0]=='replace' and not sealed:
                for p in parts:
                    if p[0]==e[2]: p[1]=e[3]
            elif e[0]=='rename' and not sealed:
                for p in parts:
                    if p[0]==e[2]: p[0]=e[3]
            elif e[0]=='limit' and not sealed: del parts[max(0,e[2]):]
            elif e[0]=='seal': bundles[e[1]][1]=True
            elif e[0]=='dispatch':
                if not sealed or not parts: continue
                if e[1] in delivered: continue
                out.append(' | '.join(label+': '+text for label,text in parts))
                delivered.add(e[1]); del bundles[e[1]]
    return [out,[[k,v[0],v[1]] for k,v in bundles.items()],sorted(delivered)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = ["[['open','a'],['part','a','Name','A'*N],['part','a','Count','2'],['replace','a','Name','New'],['rename','a','Count','Total'],['seal','a'],['dispatch','a']]", "[['open','a'],['part','a','One','x'*N],['seal','a'],['part','a','Late','no'],['seal','a'],['dispatch','a']]", "[['open','a'],['part','a','One','x'*N],['part','a','Two','y'],['part','a','Three','z'],['limit','a',2],['seal','a'],['dispatch','a']]", "[['open','a'],['part','a','One','x'*N],['seal','a'],['dispatch','a'],['open','a'],['part','a','Again','y'],['seal','a'],['dispatch','a']]", "[['open','a'],['part','a','One','x'*N],['seal','a'],['dispatch','a'],['open','b'],['part','b','Two','y'],['retract','b']]", "[['open','a'],['part','a','Partial','x'*N],['dispatch','a'],['open','b'],['seal','b'],['dispatch','b']]", "[['open','a'],['part','a','Old','x'*N],['open','a']]"]
expected = {1: [[['Name: New | Total: 2'], [], ['a']], [['One: x'], [], ['a']], [['One: x | Two: y'], [], ['a']], [['One: x', 'Again: y'], [], ['a']], [['One: x'], [], ['a']], [[], [['a', [['Partial', 'x']], False], ['b', [], True]], []], [[], [['a', [], False]], []]], 2: [[['Name: New | Total: 2'], [], ['a']], [['One: xx'], [], ['a']], [['One: xx | Two: y'], [], ['a']], [['One: xx', 'Again: y'], [], ['a']], [['One: xx'], [], ['a']], [[], [['a', [['Partial', 'xx']], False], ['b', [], True]], []], [[], [['a', [], False]], []]], 3: [[['Name: New | Total: 2'], [], ['a']], [['One: xxx'], [], ['a']], [['One: xxx | Two: y'], [], ['a']], [['One: xxx', 'Again: y'], [], ['a']], [['One: xxx'], [], ['a']], [[], [['a', [['Partial', 'xxx']], False], ['b', [], True]], []], [[], [['a', [], False]], []]], 4: [[['Name: New | Total: 2'], [], ['a']], [['One: xxxx'], [], ['a']], [['One: xxxx | Two: y'], [], ['a']], [['One: xxxx', 'Again: y'], [], ['a']], [['One: xxxx'], [], ['a']], [[], [['a', [['Partial', 'xxxx']], False], ['b', [], True]], []], [[], [['a', [], False]], []]], 5: [[['Name: New | Total: 2'], [], ['a']], [['One: xxxxx'], [], ['a']], [['One: xxxxx | Two: y'], [], ['a']], [['One: xxxxx', 'Again: y'], [], ['a']], [['One: xxxxx'], [], ['a']], [[], [['a', [['Partial', 'xxxxx']], False], ['b', [], True]], []], [[], [['a', [], False]], []]]}[N]
for i, expression in enumerate(fixtures):
    check("trace-"+str(i+1), solve(eval(expression)), expected[i])
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
trace-1[['Total: 2 | Name: New'], [], ['a']][['Name: New | Total: 2'], [], ['a']]Failed
trace-2[['One: x'], [], ['a']][['One: x'], [], ['a']]Passed
trace-3[['Three: z | Two: y'], [], ['a']][['One: x | Two: y'], [], ['a']]Failed
trace-4[['One: x', 'Again: y'], [], ['a']][['One: x', 'Again: y'], [], ['a']]Passed
trace-5[['One: x'], [], ['a']][['One: x'], [], ['a']]Passed
trace-6[[], [['a', [['Partial', 'x']], False], ['b', [], True]], []][[], [['a', [['Partial', 'x']], False], ['b', [], True]], []]Passed
trace-7[[], [['a', [], False]], []][[], [['a', [], False]], []]Passed

SHA-256 / 29b9e015d0e033b529c82567794ae047b11e9e0f63ed515bd18d4db8db74b19a

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.

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Verification & scope

Stipulated bounded policy, not a browser, speech engine, platform API, or standards conformance claim. 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 2026-09-29T14:40:32.221486+00:00.

Case digest / c1816f499e78b37d2b517b04480b8ed0fde1a61078f63d65431ac678aec4f6b0