FA-77891 / Subtitle cue timing / Open access

Partial subtitle resync from a point: resync scope boundary · case 01

The cue that begins exactly at the chosen resync point keeps its old timing while all later cues move.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The scope test uses start>from_ms, excluding the cue at the resync point itself.

THE FAILURE

The scope test uses start>from_ms, excluding the cue at the resync point itself.

Unsuccessful approach: Testing the end time instead also drags earlier cues that merely straddle the resync point.

Case contract

Cues [start,end,text] (sorted by start) whose start is at or after from_ms are shifted by offset ms (start and end). A cue whose end becomes <= 0 is dropped; a negative start is clamped to 0 without moving its end. The result is re-sorted by (start,end) and numbered from 1 as [n,start,end,text].

Why this case matters

Subtitle timing defects shift, hide or overlap captions that viewers depend on for comprehension and accessibility.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(cues, offset, from_ms):
    out=[]
    for start,end,text in cues:
        if start>from_ms:
            start+=offset
            end+=offset
        if end<=0:
            continue
        if start<0:
            start=0
        out.append([start,end,text])
    out.sort(key=lambda c:(c[0],c[1]))
    return [[i+1]+c for i,c in enumerate(out)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: resync scope boundary', [[[0, 500, 'a'], [600, 900, 'b']], -500, 600], [[1, 0, 500, 'a'], [2, 100, 400, 'b']]), ('regression variant: resync scope boundary', [[[2500, 2501, 'b']], -300, 2500], [[1, 2200, 2201, 'b']]), ('partial repair probe: resync scope boundary', [[[3000, 3001, 'a'], [3500, 3501, 'c'], [4750, 7750, 'c'], [6150, 6350, 'a'], [7550, 7750, 'c']], 250, 7550], [[1, 3000, 3001, 'a'], [2, 3500, 3501, 'c'], [3, 4750, 7750, 'c'], [4, 6150, 6350, 'a'], [5, 7800, 8000, 'c']]), ('partial repair variant: resync scope boundary', [[[400, 1200, 'c'], [800, 1000, 'e'], [1300, 2800, 'a'], [2300, 3100, 'a']], -800, 2300], [[1, 400, 1200, 'c'], [2, 800, 1000, 'e'], [3, 1300, 2800, 'a'], [4, 1500, 2300, 'a']]), ('boundary control', [[[1000, 2000, 'a'], [3000, 4000, 'b']], -1500, 0], [[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]), ('normal control', [[[150, 151, 'd'], [200, 400, 'e']], 1000, 3319], [[1, 150, 151, 'd'], [2, 200, 400, 'e']]), ('normal control', [[[400, 401, 'e'], [2900, 3700, 'd'], [5400, 5401, 'd'], [6600, 9600, 'e'], [8600, 8601, 'a']], 250, 1518], [[1, 400, 401, 'e'], [2, 3150, 3950, 'd'], [3, 5650, 5651, 'd'], [4, 6850, 9850, 'e'], [5, 8850, 8851, 'a']]), ('normal control', [[[2300, 5300, 'c'], [3300, 4800, 'e']], -1200, 813], [[1, 1100, 4100, 'c'], [2, 2100, 3600, 'e']])], [('regression: resync scope boundary', [[[100, 200, 'x']], 50, 100], [[1, 150, 250, 'x']]), ('regression variant: resync scope boundary', [[[1100, 1900, 'b'], [2650, 4150, 'c'], [2700, 2900, 'a'], [3100, 3300, 'e']], 4000, 1100], [[1, 5100, 5900, 'b'], [2, 6650, 8150, 'c'], [3, 6700, 6900, 'a'], [4, 7100, 7300, 'e']]), ('partial repair probe: resync scope boundary', [[[300, 500, 'd']], -1200, 500], [[1, 300, 500, 'd']]), ('partial repair variant: resync scope boundary', [[[2300, 2500, 'e']], -3000, 2500], [[1, 2300, 2500, 'e']]), ('boundary control', [[[1000, 2000, 'a'], [3000, 4000, 'b']], -1500, 0], [[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]), ('normal control', [[[150, 1650, 'b'], [250, 3250, 'b'], [450, 451, 'e'], [1450, 1451, 'd'], [2700, 3500, 'c']], 4000, 4769], [[1, 150, 1650, 'b'], [2, 250, 3250, 'b'], [3, 450, 451, 'e'], [4, 1450, 1451, 'd'], [5, 2700, 3500, 'c']]), ('normal control', [[[2050, 2051, 'c'], [2050, 2250, 'c']], -1200, 1309], [[1, 850, 851, 'c'], [2, 850, 1050, 'c']]), ('normal control', [[[300, 3300, 'b'], [3200, 4000, 'a'], [3500, 6500, 'd']], -800, 0], [[1, 0, 2500, 'b'], [2, 2400, 3200, 'a'], [3, 2700, 5700, 'd']])], [('regression: resync scope boundary', [[[2500, 5500, 'e']], 4000, 2500], [[1, 6500, 9500, 'e']]), ('regression variant: resync scope boundary', [[[400, 600, 'c'], [400, 1200, 'd'], [2900, 3100, 'b'], [5100, 5101, 'a']], -3000, 5100], [[1, 400, 600, 'c'], [2, 400, 1200, 'd'], [3, 2100, 2101, 'a'], [4, 2900, 3100, 'b']]), ('partial repair probe: resync scope boundary', [[[-200, 2800, 'b'], [0, 1500, 'd']], 250, 2098], [[1, 0, 1500, 'd'], [2, 0, 2800, 'b']]), ('partial repair variant: resync scope boundary', [[[2500, 4000, 'c']], -300, 4000], [[1, 2500, 4000, 'c']]), ('boundary control', [[[1000, 2000, 'a'], [3000, 4000, 'b']], -1500, 0], [[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]), ('normal control', [[[150, 3150, 'd'], [2350, 3850, 'c'], [2800, 3000, 'a']], -300, 5341], [[1, 150, 3150, 'd'], [2, 2350, 3850, 'c'], [3, 2800, 3000, 'a']]), ('normal control', [[[50, 51, 'c']], 1000, 1936], [[1, 50, 51, 'c']]), ('normal control', [[[800, 801, 'c'], [3700, 4500, 'b']], 1000, 0], [[1, 1800, 1801, 'c'], [2, 4700, 5500, 'b']])], [('regression: resync scope boundary', [[[3000, 3001, 'a'], [3500, 3501, 'c'], [4750, 7750, 'c'], [6150, 6350, 'a'], [7550, 7750, 'c']], 250, 7550], [[1, 3000, 3001, 'a'], [2, 3500, 3501, 'c'], [3, 4750, 7750, 'c'], [4, 6150, 6350, 'a'], [5, 7800, 8000, 'c']]), ('regression variant: resync scope boundary', [[[3000, 3800, 'c'], [3700, 6700, 'd']], -1200, 3000], [[1, 1800, 2600, 'c'], [2, 2500, 5500, 'd']]), ('partial repair probe: resync scope boundary', [[[550, 1350, 'b']], 4000, 1350], [[1, 550, 1350, 'b']]), ('partial repair variant: resync scope boundary', [[[3000, 3800, 'c'], [3050, 4550, 'b'], [4250, 5050, 'c']], 1000, 4250], [[1, 3000, 3800, 'c'], [2, 3050, 4550, 'b'], [3, 5250, 6050, 'c']]), ('boundary control', [[[1000, 2000, 'a'], [3000, 4000, 'b']], -1500, 0], [[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]), ('normal control', [[[550, 551, 'e']], -3000, 0], []), ('normal control', [[[3000, 3800, 'd'], [4400, 4401, 'd'], [6400, 7200, 'a'], [6450, 6451, 'a']], -1200, 0], [[1, 1800, 2600, 'd'], [2, 3200, 3201, 'd'], [3, 5200, 6000, 'a'], [4, 5250, 5251, 'a']]), ('normal control', [[[50, 1550, 'b'], [50, 1550, 'd'], [350, 1850, 'c']], 4000, 4374], [[1, 50, 1550, 'b'], [2, 50, 1550, 'd'], [3, 350, 1850, 'c']])], [('regression: resync scope boundary', [[[500, 3500, 'b'], [3000, 4500, 'd'], [4400, 4600, 'a']], -1200, 500], [[1, 0, 2300, 'b'], [2, 1800, 3300, 'd'], [3, 3200, 3400, 'a']]), ('regression variant: resync scope boundary', [[[3000, 3800, 'c'], [3500, 4300, 'e'], [6400, 6600, 'c'], [7900, 8700, 'e'], [9300, 10100, 'c']], 4000, 3000], [[1, 7000, 7800, 'c'], [2, 7500, 8300, 'e'], [3, 10400, 10600, 'c'], [4, 11900, 12700, 'e'], [5, 13300, 14100, 'c']]), ('partial repair probe: resync scope boundary', [[[500, 3500, 'c'], [3000, 3800, 'a'], [3050, 6050, 'c'], [3800, 4600, 'd'], [4250, 7250, 'd']], -3000, 6050], [[1, 500, 3500, 'c'], [2, 3000, 3800, 'a'], [3, 3050, 6050, 'c'], [4, 3800, 4600, 'd'], [5, 4250, 7250, 'd']]), ('partial repair variant: resync scope boundary', [[[400, 600, 'c'], [2900, 2901, 'c'], [3350, 3550, 'b']], 250, 2901], [[1, 400, 600, 'c'], [2, 2900, 2901, 'c'], [3, 3600, 3800, 'b']]), ('boundary control', [[[1000, 2000, 'a'], [3000, 4000, 'b']], -1500, 0], [[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]), ('normal control', [[[500, 1300, 'c'], [1000, 1200, 'b'], [1000, 1200, 'a']], 4000, 5861], [[1, 500, 1300, 'c'], [2, 1000, 1200, 'b'], [3, 1000, 1200, 'a']]), ('normal control', [[[0, 1500, 'e']], 1000, 3783], [[1, 0, 1500, 'e']]), ('normal control', [[[800, 1000, 'a'], [2300, 2500, 'd'], [4100, 5600, 'e'], [4300, 5800, 'e']], -3000, 0], [[1, 1100, 2600, 'e'], [2, 1300, 2800, 'e']])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), 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 fixture	Actual	Expected	Outcome
regression: resync scope boundary	`[[1, 0, 500, 'a'], [2, 600, 900, 'b']]`	`[[1, 0, 500, 'a'], [2, 100, 400, 'b']]`	Failed
regression variant: resync scope boundary	`[[1, 2500, 2501, 'b']]`	`[[1, 2200, 2201, 'b']]`	Failed
partial repair probe: resync scope boundary	`[[1, 3000, 3001, 'a'], [2, 3500, 3501, 'c'], [3, 4750, 7750, 'c'], [4, 6150, 6350, 'a'], [5, 7550, 7750, 'c']]`	`[[1, 3000, 3001, 'a'], [2, 3500, 3501, 'c'], [3, 4750, 7750, 'c'], [4, 6150, 6350, 'a'], [5, 7800, 8000, 'c']]`	Failed
partial repair variant: resync scope boundary	`[[1, 400, 1200, 'c'], [2, 800, 1000, 'e'], [3, 1300, 2800, 'a'], [4, 2300, 3100, 'a']]`	`[[1, 400, 1200, 'c'], [2, 800, 1000, 'e'], [3, 1300, 2800, 'a'], [4, 1500, 2300, 'a']]`	Failed
boundary control	`[[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]`	`[[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]`	Passed
normal control	`[[1, 150, 151, 'd'], [2, 200, 400, 'e']]`	`[[1, 150, 151, 'd'], [2, 200, 400, 'e']]`	Passed
normal control	`[[1, 400, 401, 'e'], [2, 3150, 3950, 'd'], [3, 5650, 5651, 'd'], [4, 6850, 9850, 'e'], [5, 8850, 8851, 'a']]`	`[[1, 400, 401, 'e'], [2, 3150, 3950, 'd'], [3, 5650, 5651, 'd'], [4, 6850, 9850, 'e'], [5, 8850, 8851, 'a']]`	Passed
normal control	`[[1, 1100, 4100, 'c'], [2, 2100, 3600, 'e']]`	`[[1, 1100, 4100, 'c'], [2, 2100, 3600, 'e']]`	Passed

SHA-256 / 909c02f1e60129600034492a088b7543c4f5a994bdc77aefc0f27f260638056c

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(cues, offset, from_ms):
    out=[]
    for start,end,text in cues:
        if end>=from_ms:
            start+=offset
            end+=offset
        if end<=0:
            continue
        if start<0:
            start=0
        out.append([start,end,text])
    out.sort(key=lambda c:(c[0],c[1]))
    return [[i+1]+c for i,c in enumerate(out)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: resync scope boundary', [[[0, 500, 'a'], [600, 900, 'b']], -500, 600], [[1, 0, 500, 'a'], [2, 100, 400, 'b']]), ('regression variant: resync scope boundary', [[[2500, 2501, 'b']], -300, 2500], [[1, 2200, 2201, 'b']]), ('partial repair probe: resync scope boundary', [[[3000, 3001, 'a'], [3500, 3501, 'c'], [4750, 7750, 'c'], [6150, 6350, 'a'], [7550, 7750, 'c']], 250, 7550], [[1, 3000, 3001, 'a'], [2, 3500, 3501, 'c'], [3, 4750, 7750, 'c'], [4, 6150, 6350, 'a'], [5, 7800, 8000, 'c']]), ('partial repair variant: resync scope boundary', [[[400, 1200, 'c'], [800, 1000, 'e'], [1300, 2800, 'a'], [2300, 3100, 'a']], -800, 2300], [[1, 400, 1200, 'c'], [2, 800, 1000, 'e'], [3, 1300, 2800, 'a'], [4, 1500, 2300, 'a']]), ('boundary control', [[[1000, 2000, 'a'], [3000, 4000, 'b']], -1500, 0], [[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]), ('normal control', [[[150, 151, 'd'], [200, 400, 'e']], 1000, 3319], [[1, 150, 151, 'd'], [2, 200, 400, 'e']]), ('normal control', [[[400, 401, 'e'], [2900, 3700, 'd'], [5400, 5401, 'd'], [6600, 9600, 'e'], [8600, 8601, 'a']], 250, 1518], [[1, 400, 401, 'e'], [2, 3150, 3950, 'd'], [3, 5650, 5651, 'd'], [4, 6850, 9850, 'e'], [5, 8850, 8851, 'a']]), ('normal control', [[[2300, 5300, 'c'], [3300, 4800, 'e']], -1200, 813], [[1, 1100, 4100, 'c'], [2, 2100, 3600, 'e']])], [('regression: resync scope boundary', [[[100, 200, 'x']], 50, 100], [[1, 150, 250, 'x']]), ('regression variant: resync scope boundary', [[[1100, 1900, 'b'], [2650, 4150, 'c'], [2700, 2900, 'a'], [3100, 3300, 'e']], 4000, 1100], [[1, 5100, 5900, 'b'], [2, 6650, 8150, 'c'], [3, 6700, 6900, 'a'], [4, 7100, 7300, 'e']]), ('partial repair probe: resync scope boundary', [[[300, 500, 'd']], -1200, 500], [[1, 300, 500, 'd']]), ('partial repair variant: resync scope boundary', [[[2300, 2500, 'e']], -3000, 2500], [[1, 2300, 2500, 'e']]), ('boundary control', [[[1000, 2000, 'a'], [3000, 4000, 'b']], -1500, 0], [[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]), ('normal control', [[[150, 1650, 'b'], [250, 3250, 'b'], [450, 451, 'e'], [1450, 1451, 'd'], [2700, 3500, 'c']], 4000, 4769], [[1, 150, 1650, 'b'], [2, 250, 3250, 'b'], [3, 450, 451, 'e'], [4, 1450, 1451, 'd'], [5, 2700, 3500, 'c']]), ('normal control', [[[2050, 2051, 'c'], [2050, 2250, 'c']], -1200, 1309], [[1, 850, 851, 'c'], [2, 850, 1050, 'c']]), ('normal control', [[[300, 3300, 'b'], [3200, 4000, 'a'], [3500, 6500, 'd']], -800, 0], [[1, 0, 2500, 'b'], [2, 2400, 3200, 'a'], [3, 2700, 5700, 'd']])], [('regression: resync scope boundary', [[[2500, 5500, 'e']], 4000, 2500], [[1, 6500, 9500, 'e']]), ('regression variant: resync scope boundary', [[[400, 600, 'c'], [400, 1200, 'd'], [2900, 3100, 'b'], [5100, 5101, 'a']], -3000, 5100], [[1, 400, 600, 'c'], [2, 400, 1200, 'd'], [3, 2100, 2101, 'a'], [4, 2900, 3100, 'b']]), ('partial repair probe: resync scope boundary', [[[-200, 2800, 'b'], [0, 1500, 'd']], 250, 2098], [[1, 0, 1500, 'd'], [2, 0, 2800, 'b']]), ('partial repair variant: resync scope boundary', [[[2500, 4000, 'c']], -300, 4000], [[1, 2500, 4000, 'c']]), ('boundary control', [[[1000, 2000, 'a'], [3000, 4000, 'b']], -1500, 0], [[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]), ('normal control', [[[150, 3150, 'd'], [2350, 3850, 'c'], [2800, 3000, 'a']], -300, 5341], [[1, 150, 3150, 'd'], [2, 2350, 3850, 'c'], [3, 2800, 3000, 'a']]), ('normal control', [[[50, 51, 'c']], 1000, 1936], [[1, 50, 51, 'c']]), ('normal control', [[[800, 801, 'c'], [3700, 4500, 'b']], 1000, 0], [[1, 1800, 1801, 'c'], [2, 4700, 5500, 'b']])], [('regression: resync scope boundary', [[[3000, 3001, 'a'], [3500, 3501, 'c'], [4750, 7750, 'c'], [6150, 6350, 'a'], [7550, 7750, 'c']], 250, 7550], [[1, 3000, 3001, 'a'], [2, 3500, 3501, 'c'], [3, 4750, 7750, 'c'], [4, 6150, 6350, 'a'], [5, 7800, 8000, 'c']]), ('regression variant: resync scope boundary', [[[3000, 3800, 'c'], [3700, 6700, 'd']], -1200, 3000], [[1, 1800, 2600, 'c'], [2, 2500, 5500, 'd']]), ('partial repair probe: resync scope boundary', [[[550, 1350, 'b']], 4000, 1350], [[1, 550, 1350, 'b']]), ('partial repair variant: resync scope boundary', [[[3000, 3800, 'c'], [3050, 4550, 'b'], [4250, 5050, 'c']], 1000, 4250], [[1, 3000, 3800, 'c'], [2, 3050, 4550, 'b'], [3, 5250, 6050, 'c']]), ('boundary control', [[[1000, 2000, 'a'], [3000, 4000, 'b']], -1500, 0], [[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]), ('normal control', [[[550, 551, 'e']], -3000, 0], []), ('normal control', [[[3000, 3800, 'd'], [4400, 4401, 'd'], [6400, 7200, 'a'], [6450, 6451, 'a']], -1200, 0], [[1, 1800, 2600, 'd'], [2, 3200, 3201, 'd'], [3, 5200, 6000, 'a'], [4, 5250, 5251, 'a']]), ('normal control', [[[50, 1550, 'b'], [50, 1550, 'd'], [350, 1850, 'c']], 4000, 4374], [[1, 50, 1550, 'b'], [2, 50, 1550, 'd'], [3, 350, 1850, 'c']])], [('regression: resync scope boundary', [[[500, 3500, 'b'], [3000, 4500, 'd'], [4400, 4600, 'a']], -1200, 500], [[1, 0, 2300, 'b'], [2, 1800, 3300, 'd'], [3, 3200, 3400, 'a']]), ('regression variant: resync scope boundary', [[[3000, 3800, 'c'], [3500, 4300, 'e'], [6400, 6600, 'c'], [7900, 8700, 'e'], [9300, 10100, 'c']], 4000, 3000], [[1, 7000, 7800, 'c'], [2, 7500, 8300, 'e'], [3, 10400, 10600, 'c'], [4, 11900, 12700, 'e'], [5, 13300, 14100, 'c']]), ('partial repair probe: resync scope boundary', [[[500, 3500, 'c'], [3000, 3800, 'a'], [3050, 6050, 'c'], [3800, 4600, 'd'], [4250, 7250, 'd']], -3000, 6050], [[1, 500, 3500, 'c'], [2, 3000, 3800, 'a'], [3, 3050, 6050, 'c'], [4, 3800, 4600, 'd'], [5, 4250, 7250, 'd']]), ('partial repair variant: resync scope boundary', [[[400, 600, 'c'], [2900, 2901, 'c'], [3350, 3550, 'b']], 250, 2901], [[1, 400, 600, 'c'], [2, 2900, 2901, 'c'], [3, 3600, 3800, 'b']]), ('boundary control', [[[1000, 2000, 'a'], [3000, 4000, 'b']], -1500, 0], [[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]), ('normal control', [[[500, 1300, 'c'], [1000, 1200, 'b'], [1000, 1200, 'a']], 4000, 5861], [[1, 500, 1300, 'c'], [2, 1000, 1200, 'b'], [3, 1000, 1200, 'a']]), ('normal control', [[[0, 1500, 'e']], 1000, 3783], [[1, 0, 1500, 'e']]), ('normal control', [[[800, 1000, 'a'], [2300, 2500, 'd'], [4100, 5600, 'e'], [4300, 5800, 'e']], -3000, 0], [[1, 1100, 2600, 'e'], [2, 1300, 2800, 'e']])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), 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 fixture	Actual	Expected	Outcome
regression: resync scope boundary	`[[1, 0, 500, 'a'], [2, 100, 400, 'b']]`	`[[1, 0, 500, 'a'], [2, 100, 400, 'b']]`	Passed
regression variant: resync scope boundary	`[[1, 2200, 2201, 'b']]`	`[[1, 2200, 2201, 'b']]`	Passed
partial repair probe: resync scope boundary	`[[1, 3000, 3001, 'a'], [2, 3500, 3501, 'c'], [3, 5000, 8000, 'c'], [4, 6150, 6350, 'a'], [5, 7800, 8000, 'c']]`	`[[1, 3000, 3001, 'a'], [2, 3500, 3501, 'c'], [3, 4750, 7750, 'c'], [4, 6150, 6350, 'a'], [5, 7800, 8000, 'c']]`	Failed
partial repair variant: resync scope boundary	`[[1, 400, 1200, 'c'], [2, 500, 2000, 'a'], [3, 800, 1000, 'e'], [4, 1500, 2300, 'a']]`	`[[1, 400, 1200, 'c'], [2, 800, 1000, 'e'], [3, 1300, 2800, 'a'], [4, 1500, 2300, 'a']]`	Failed
boundary control	`[[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]`	`[[1, 0, 500, 'a'], [2, 1500, 2500, 'b']]`	Passed
normal control	`[[1, 150, 151, 'd'], [2, 200, 400, 'e']]`	`[[1, 150, 151, 'd'], [2, 200, 400, 'e']]`	Passed
normal control	`[[1, 400, 401, 'e'], [2, 3150, 3950, 'd'], [3, 5650, 5651, 'd'], [4, 6850, 9850, 'e'], [5, 8850, 8851, 'a']]`	`[[1, 400, 401, 'e'], [2, 3150, 3950, 'd'], [3, 5650, 5651, 'd'], [4, 6850, 9850, 'e'], [5, 8850, 8851, 'a']]`	Passed
normal control	`[[1, 1100, 4100, 'c'], [2, 2100, 3600, 'e']]`	`[[1, 1100, 4100, 'c'], [2, 2100, 3600, 'e']]`	Passed

SHA-256 / 6544c3685c8aa8d200b6416d9c81803b0bf3aa0fdce3ba6ca31496b92b18f09e

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 8 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

A deterministic bounded teaching model with a stipulated toy contract; it does not claim conformance to any subtitle standard. 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 2026-09-29T14:49:30.067541+00:00.

Case digest / 3ebe27785bf1269a8385ac1d36039280ca1accf3914a89b6f042d8e10fa687e7