FA-21596 / Assistive announcements / Open access

Closing language scope resets all nesting · case 01

The announcement trace violates the stated speech-markup contract.

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

ROOT CAUSE

Fault site: if len(languages)>1: languages.pop() is implemented as if len(languages)>1: languages=[languages[0]]

THE FAILURE

Fault site: if len(languages)>1: languages.pop() is implemented as if len(languages)>1: languages=[languages[0]]

Unsuccessful approach: The attempted repair substitutes if len(languages)>1: languages.pop(0) and still violates a regression oracle.

Case contract

Bounded token renderer has independent language and emphasis stacks. Text emits [language,emphasis,text]. Push/pop scopes restore prior values; unmatched pops are ignored. Spell emits characters separated by spaces; digits uses fixed English digit words preserving zeros. Pause emits [pause,nonnegative duration] without text. Mark emits named bookmark and current spoken-text count. Break emits newline. Reset restores base en/normal without deleting output. Empty text emits nothing.

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):
    languages=['en']; emphasis=['normal']; out=[]; count=0
    for e in events:
        op=e[0]
        if op=='language': languages.append(e[1])
        elif op=='end-language':
            if len(languages)>1: languages=[languages[0]]
        elif op=='emphasis': emphasis.append(e[1])
        elif op=='end-emphasis':
            if len(emphasis)>1: emphasis.pop()
        elif op=='reset': languages=['en']; emphasis=['normal']
        elif op=='pause': out.append(['pause',max(0,e[1])])
        elif op=='mark': out.append(['mark',e[1],count])
        else:
            if op=='spell': text=' '.join(e[1])
            elif op=='digits': text=' '.join(['zero','one','two','three','four','five','six','seven','eight','nine'][int(c)] for c in e[1])
            elif op=='break': text='\n'
            else: text=e[1]
            if text: out.append([languages[-1],emphasis[-1],text]); count+=1
    return [out,languages,emphasis,count]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = ["[['language','fr'],['language','de'],['text','hallo'*N],['end-language'],['text','salut'],['end-language'],['text','hello']]", "[['emphasis','strong'],['emphasis','soft'],['text','word'*N],['end-emphasis'],['text','more'],['end-emphasis']]", "[['text','x'*N],['pause',-N],['pause',N],['mark','here'],['spell','AB'],['digits','00'+str(N)]]", "[['emphasis','strong'],['text','before'*N],['reset'],['text','after']]", "[['text',''],['break'],['mark','after']]", "[['end-language'],['end-emphasis'],['digits','0']]", '[]']
expected = {1: [[[['de', 'normal', 'hallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3], [[['en', 'soft', 'word'], ['en', 'strong', 'more']], ['en'], ['normal'], 2], [[['en', 'normal', 'x'], ['pause', 0], ['pause', 1], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero one']], ['en'], ['normal'], 3], [[['en', 'strong', 'before'], ['en', 'normal', 'after']], ['en'], ['normal'], 2], [[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1], [[['en', 'normal', 'zero']], ['en'], ['normal'], 1], [[], ['en'], ['normal'], 0]], 2: [[[['de', 'normal', 'hallohallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3], [[['en', 'soft', 'wordword'], ['en', 'strong', 'more']], ['en'], ['normal'], 2], [[['en', 'normal', 'xx'], ['pause', 0], ['pause', 2], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero two']], ['en'], ['normal'], 3], [[['en', 'strong', 'beforebefore'], ['en', 'normal', 'after']], ['en'], ['normal'], 2], [[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1], [[['en', 'normal', 'zero']], ['en'], ['normal'], 1], [[], ['en'], ['normal'], 0]], 3: [[[['de', 'normal', 'hallohallohallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3], [[['en', 'soft', 'wordwordword'], ['en', 'strong', 'more']], ['en'], ['normal'], 2], [[['en', 'normal', 'xxx'], ['pause', 0], ['pause', 3], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero three']], ['en'], ['normal'], 3], [[['en', 'strong', 'beforebeforebefore'], ['en', 'normal', 'after']], ['en'], ['normal'], 2], [[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1], [[['en', 'normal', 'zero']], ['en'], ['normal'], 1], [[], ['en'], ['normal'], 0]], 4: [[[['de', 'normal', 'hallohallohallohallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3], [[['en', 'soft', 'wordwordwordword'], ['en', 'strong', 'more']], ['en'], ['normal'], 2], [[['en', 'normal', 'xxxx'], ['pause', 0], ['pause', 4], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero four']], ['en'], ['normal'], 3], [[['en', 'strong', 'beforebeforebeforebefore'], ['en', 'normal', 'after']], ['en'], ['normal'], 2], [[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1], [[['en', 'normal', 'zero']], ['en'], ['normal'], 1], [[], ['en'], ['normal'], 0]], 5: [[[['de', 'normal', 'hallohallohallohallohallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3], [[['en', 'soft', 'wordwordwordwordword'], ['en', 'strong', 'more']], ['en'], ['normal'], 2], [[['en', 'normal', 'xxxxx'], ['pause', 0], ['pause', 5], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero five']], ['en'], ['normal'], 3], [[['en', 'strong', 'beforebeforebeforebeforebefore'], ['en', 'normal', 'after']], ['en'], ['normal'], 2], [[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1], [[['en', 'normal', 'zero']], ['en'], ['normal'], 1], [[], ['en'], ['normal'], 0]]}[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 fixture	Actual	Expected	Outcome
trace-1	`[[['de', 'normal', 'hallo'], ['en', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3]`	`[[['de', 'normal', 'hallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3]`	Failed
trace-2	`[[['en', 'soft', 'word'], ['en', 'strong', 'more']], ['en'], ['normal'], 2]`	`[[['en', 'soft', 'word'], ['en', 'strong', 'more']], ['en'], ['normal'], 2]`	Passed
trace-3	`[[['en', 'normal', 'x'], ['pause', 0], ['pause', 1], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero one']], ['en'], ['normal'], 3]`	`[[['en', 'normal', 'x'], ['pause', 0], ['pause', 1], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero one']], ['en'], ['normal'], 3]`	Passed
trace-4	`[[['en', 'strong', 'before'], ['en', 'normal', 'after']], ['en'], ['normal'], 2]`	`[[['en', 'strong', 'before'], ['en', 'normal', 'after']], ['en'], ['normal'], 2]`	Passed
trace-5	`[[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1]`	`[[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1]`	Passed
trace-6	`[[['en', 'normal', 'zero']], ['en'], ['normal'], 1]`	`[[['en', 'normal', 'zero']], ['en'], ['normal'], 1]`	Passed
trace-7	`[[], ['en'], ['normal'], 0]`	`[[], ['en'], ['normal'], 0]`	Passed

SHA-256 / e6022cfa546322fc1425a790f2c7453bca1c215576b075265adcac9799c1cbdc

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(events):
    languages=['en']; emphasis=['normal']; out=[]; count=0
    for e in events:
        op=e[0]
        if op=='language': languages.append(e[1])
        elif op=='end-language':
            if len(languages)>1: languages.pop(0)
        elif op=='emphasis': emphasis.append(e[1])
        elif op=='end-emphasis':
            if len(emphasis)>1: emphasis.pop()
        elif op=='reset': languages=['en']; emphasis=['normal']
        elif op=='pause': out.append(['pause',max(0,e[1])])
        elif op=='mark': out.append(['mark',e[1],count])
        else:
            if op=='spell': text=' '.join(e[1])
            elif op=='digits': text=' '.join(['zero','one','two','three','four','five','six','seven','eight','nine'][int(c)] for c in e[1])
            elif op=='break': text='\n'
            else: text=e[1]
            if text: out.append([languages[-1],emphasis[-1],text]); count+=1
    return [out,languages,emphasis,count]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = ["[['language','fr'],['language','de'],['text','hallo'*N],['end-language'],['text','salut'],['end-language'],['text','hello']]", "[['emphasis','strong'],['emphasis','soft'],['text','word'*N],['end-emphasis'],['text','more'],['end-emphasis']]", "[['text','x'*N],['pause',-N],['pause',N],['mark','here'],['spell','AB'],['digits','00'+str(N)]]", "[['emphasis','strong'],['text','before'*N],['reset'],['text','after']]", "[['text',''],['break'],['mark','after']]", "[['end-language'],['end-emphasis'],['digits','0']]", '[]']
expected = {1: [[[['de', 'normal', 'hallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3], [[['en', 'soft', 'word'], ['en', 'strong', 'more']], ['en'], ['normal'], 2], [[['en', 'normal', 'x'], ['pause', 0], ['pause', 1], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero one']], ['en'], ['normal'], 3], [[['en', 'strong', 'before'], ['en', 'normal', 'after']], ['en'], ['normal'], 2], [[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1], [[['en', 'normal', 'zero']], ['en'], ['normal'], 1], [[], ['en'], ['normal'], 0]], 2: [[[['de', 'normal', 'hallohallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3], [[['en', 'soft', 'wordword'], ['en', 'strong', 'more']], ['en'], ['normal'], 2], [[['en', 'normal', 'xx'], ['pause', 0], ['pause', 2], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero two']], ['en'], ['normal'], 3], [[['en', 'strong', 'beforebefore'], ['en', 'normal', 'after']], ['en'], ['normal'], 2], [[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1], [[['en', 'normal', 'zero']], ['en'], ['normal'], 1], [[], ['en'], ['normal'], 0]], 3: [[[['de', 'normal', 'hallohallohallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3], [[['en', 'soft', 'wordwordword'], ['en', 'strong', 'more']], ['en'], ['normal'], 2], [[['en', 'normal', 'xxx'], ['pause', 0], ['pause', 3], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero three']], ['en'], ['normal'], 3], [[['en', 'strong', 'beforebeforebefore'], ['en', 'normal', 'after']], ['en'], ['normal'], 2], [[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1], [[['en', 'normal', 'zero']], ['en'], ['normal'], 1], [[], ['en'], ['normal'], 0]], 4: [[[['de', 'normal', 'hallohallohallohallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3], [[['en', 'soft', 'wordwordwordword'], ['en', 'strong', 'more']], ['en'], ['normal'], 2], [[['en', 'normal', 'xxxx'], ['pause', 0], ['pause', 4], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero four']], ['en'], ['normal'], 3], [[['en', 'strong', 'beforebeforebeforebefore'], ['en', 'normal', 'after']], ['en'], ['normal'], 2], [[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1], [[['en', 'normal', 'zero']], ['en'], ['normal'], 1], [[], ['en'], ['normal'], 0]], 5: [[[['de', 'normal', 'hallohallohallohallohallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3], [[['en', 'soft', 'wordwordwordwordword'], ['en', 'strong', 'more']], ['en'], ['normal'], 2], [[['en', 'normal', 'xxxxx'], ['pause', 0], ['pause', 5], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero five']], ['en'], ['normal'], 3], [[['en', 'strong', 'beforebeforebeforebeforebefore'], ['en', 'normal', 'after']], ['en'], ['normal'], 2], [[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1], [[['en', 'normal', 'zero']], ['en'], ['normal'], 1], [[], ['en'], ['normal'], 0]]}[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 fixture	Actual	Expected	Outcome
trace-1	`[[['de', 'normal', 'hallo'], ['de', 'normal', 'salut'], ['de', 'normal', 'hello']], ['de'], ['normal'], 3]`	`[[['de', 'normal', 'hallo'], ['fr', 'normal', 'salut'], ['en', 'normal', 'hello']], ['en'], ['normal'], 3]`	Failed
trace-2	`[[['en', 'soft', 'word'], ['en', 'strong', 'more']], ['en'], ['normal'], 2]`	`[[['en', 'soft', 'word'], ['en', 'strong', 'more']], ['en'], ['normal'], 2]`	Passed
trace-3	`[[['en', 'normal', 'x'], ['pause', 0], ['pause', 1], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero one']], ['en'], ['normal'], 3]`	`[[['en', 'normal', 'x'], ['pause', 0], ['pause', 1], ['mark', 'here', 1], ['en', 'normal', 'A B'], ['en', 'normal', 'zero zero one']], ['en'], ['normal'], 3]`	Passed
trace-4	`[[['en', 'strong', 'before'], ['en', 'normal', 'after']], ['en'], ['normal'], 2]`	`[[['en', 'strong', 'before'], ['en', 'normal', 'after']], ['en'], ['normal'], 2]`	Passed
trace-5	`[[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1]`	`[[['en', 'normal', '\n'], ['mark', 'after', 1]], ['en'], ['normal'], 1]`	Passed
trace-6	`[[['en', 'normal', 'zero']], ['en'], ['normal'], 1]`	`[[['en', 'normal', 'zero']], ['en'], ['normal'], 1]`	Passed
trace-7	`[[], ['en'], ['normal'], 0]`	`[[], ['en'], ['normal'], 0]`	Passed

SHA-256 / 2ae54b9d02a3e55c82b013c63bba30e883c0f2619e51cf3f3bf42d95fc6d3de9

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

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 2026-09-29T14:40:30.700538+00:00.

Case digest / 352636fd07c7276702f74cbb57adc7c42828026c37169ad6ef2a97d968facb7d