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FA-50391 / Raster clipping / Open access

Transactional clip edit: begin alias · case 01

Editing mutates the committed clip before commit because begin keeps an alias.

Verified by executionVariant 1 · 14 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Editing mutates the committed clip before commit because begin keeps an alias.

THE FAILURE

Editing mutates the committed clip before commit because begin keeps an alias.

Unsuccessful approach: Copying nonempty regions but using None for an empty region prevents opening a transaction from an intentionally empty clip.

Case contract

Begin stages clip edits against a copy. Commit publishes pending coverage atomically; abort discards it. Draw sees committed coverage. Beginning while already editing is ignored; edit outside a transaction is ignored. Resize clips both committed and pending regions.

Why this case matters

Raster clip state can leak coverage across draws even when every individual region is valid.

1 / The failure

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

N = 1
observations = []
def solve(commands, size):
    full=set(range(size))
    current=set(full)
    pending=None
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op=='begin' and pending is None: pending=current
        elif op=='subtract' and pending is not None: pending-=set(cmd[1])
        elif op=='add' and pending is not None: pending |= set(cmd[1]) & full
        elif op=='replace' and pending is not None: pending=set(cmd[1]) & full
        elif op=='commit' and pending is not None:
            current=set(pending)
            pending=None
        elif op=='abort': pending=None
        elif op=='resize':
            full=set(range(cmd[1]))
            current &= full
            if pending is not None: pending &= full
        elif op=='draw': out.append(sorted(current))
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['begin'], ['subtract', [0]], ['draw'], ['commit'], ['draw']], 4), [[0, 1, 2, 3], [1, 2, 3]])
    check('explicit sequence 1', solve([['begin'], ['subtract', [0]], ['begin'], ['subtract', [1]], ['commit'], ['draw']], 4), [[2, 3]])
    check('explicit sequence 2', solve([['begin'], ['replace', [0]], ['add', [1, 99, -1]], ['commit'], ['draw']], 4), [[0, 1]])
    check('explicit sequence 3', solve([['begin'], ['replace', [0]], ['replace', [2]], ['commit'], ['draw']], 4), [[2]])
    check('explicit sequence 4', solve([['begin'], ['replace', [0]], ['abort'], ['draw']], 4), [[0, 1, 2, 3]])
    check('explicit sequence 5', solve([['begin'], ['replace', [1]], ['commit'], ['subtract', [1]], ['commit'], ['draw']], 4), [[1]])
    check('explicit sequence 6', solve([['begin'], ['replace', [1, 2]], ['resize', 2], ['commit'], ['draw']], 4), [[1]])
    check('explicit sequence 7', solve([['begin'], ['replace', [1]], ['commit'], ['resize', 3], ['draw']], 4), [[1]])
    check('explicit sequence 8', solve([['commit'], ['abort'], ['draw']], 4), [[0, 1, 2, 3]])
    check('explicit sequence 9', solve([['begin'], ['replace', []], ['commit'], ['draw']], 4), [[]])
    check('explicit sequence 10', solve([['begin'], ['replace', []], ['commit'], ['begin'], ['add', [0]], ['commit'], ['draw']], 4), [[0]])
    check('explicit sequence 11', solve([['begin'], ['replace', []], ['begin'], ['add', [0]], ['commit'], ['draw']], 4), [[0]])
    check('explicit sequence 12', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['add', [1]], ['commit'], ['draw']], 4), [[0, 1]])
    check('explicit sequence 13', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['subtract', [0]], ['abort'], ['draw']], 4), [[0]])
if N == 2:
    check('explicit sequence 0', solve([['begin'], ['subtract', [0]], ['draw'], ['commit'], ['draw']], 5), [[0, 1, 2, 3, 4], [1, 2, 3, 4]])
    check('explicit sequence 1', solve([['begin'], ['subtract', [0]], ['begin'], ['subtract', [1]], ['commit'], ['draw']], 5), [[2, 3, 4]])
    check('explicit sequence 2', solve([['begin'], ['replace', [0]], ['add', [1, 99, -1]], ['commit'], ['draw']], 5), [[0, 1]])
    check('explicit sequence 3', solve([['begin'], ['replace', [0]], ['replace', [2]], ['commit'], ['draw']], 5), [[2]])
    check('explicit sequence 4', solve([['begin'], ['replace', [0]], ['abort'], ['draw']], 5), [[0, 1, 2, 3, 4]])
    check('explicit sequence 5', solve([['begin'], ['replace', [1]], ['commit'], ['subtract', [1]], ['commit'], ['draw']], 5), [[1]])
    check('explicit sequence 6', solve([['begin'], ['replace', [1, 2]], ['resize', 2], ['commit'], ['draw']], 5), [[1]])
    check('explicit sequence 7', solve([['begin'], ['replace', [1]], ['commit'], ['resize', 3], ['draw']], 5), [[1]])
    check('explicit sequence 8', solve([['commit'], ['abort'], ['draw']], 5), [[0, 1, 2, 3, 4]])
    check('explicit sequence 9', solve([['begin'], ['replace', []], ['commit'], ['draw']], 5), [[]])
    check('explicit sequence 10', solve([['begin'], ['replace', []], ['commit'], ['begin'], ['add', [0]], ['commit'], ['draw']], 5), [[0]])
    check('explicit sequence 11', solve([['begin'], ['replace', []], ['begin'], ['add', [0]], ['commit'], ['draw']], 5), [[0]])
    check('explicit sequence 12', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['add', [1]], ['commit'], ['draw']], 5), [[0, 1]])
    check('explicit sequence 13', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['subtract', [0]], ['abort'], ['draw']], 5), [[0]])
if N == 3:
    check('explicit sequence 0', solve([['begin'], ['subtract', [0]], ['draw'], ['commit'], ['draw']], 6), [[0, 1, 2, 3, 4, 5], [1, 2, 3, 4, 5]])
    check('explicit sequence 1', solve([['begin'], ['subtract', [0]], ['begin'], ['subtract', [1]], ['commit'], ['draw']], 6), [[2, 3, 4, 5]])
    check('explicit sequence 2', solve([['begin'], ['replace', [0]], ['add', [1, 99, -1]], ['commit'], ['draw']], 6), [[0, 1]])
    check('explicit sequence 3', solve([['begin'], ['replace', [0]], ['replace', [2]], ['commit'], ['draw']], 6), [[2]])
    check('explicit sequence 4', solve([['begin'], ['replace', [0]], ['abort'], ['draw']], 6), [[0, 1, 2, 3, 4, 5]])
    check('explicit sequence 5', solve([['begin'], ['replace', [1]], ['commit'], ['subtract', [1]], ['commit'], ['draw']], 6), [[1]])
    check('explicit sequence 6', solve([['begin'], ['replace', [1, 2]], ['resize', 2], ['commit'], ['draw']], 6), [[1]])
    check('explicit sequence 7', solve([['begin'], ['replace', [1]], ['commit'], ['resize', 3], ['draw']], 6), [[1]])
    check('explicit sequence 8', solve([['commit'], ['abort'], ['draw']], 6), [[0, 1, 2, 3, 4, 5]])
    check('explicit sequence 9', solve([['begin'], ['replace', []], ['commit'], ['draw']], 6), [[]])
    check('explicit sequence 10', solve([['begin'], ['replace', []], ['commit'], ['begin'], ['add', [0]], ['commit'], ['draw']], 6), [[0]])
    check('explicit sequence 11', solve([['begin'], ['replace', []], ['begin'], ['add', [0]], ['commit'], ['draw']], 6), [[0]])
    check('explicit sequence 12', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['add', [1]], ['commit'], ['draw']], 6), [[0, 1]])
    check('explicit sequence 13', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['subtract', [0]], ['abort'], ['draw']], 6), [[0]])
if N == 4:
    check('explicit sequence 0', solve([['begin'], ['subtract', [0]], ['draw'], ['commit'], ['draw']], 7), [[0, 1, 2, 3, 4, 5, 6], [1, 2, 3, 4, 5, 6]])
    check('explicit sequence 1', solve([['begin'], ['subtract', [0]], ['begin'], ['subtract', [1]], ['commit'], ['draw']], 7), [[2, 3, 4, 5, 6]])
    check('explicit sequence 2', solve([['begin'], ['replace', [0]], ['add', [1, 99, -1]], ['commit'], ['draw']], 7), [[0, 1]])
    check('explicit sequence 3', solve([['begin'], ['replace', [0]], ['replace', [2]], ['commit'], ['draw']], 7), [[2]])
    check('explicit sequence 4', solve([['begin'], ['replace', [0]], ['abort'], ['draw']], 7), [[0, 1, 2, 3, 4, 5, 6]])
    check('explicit sequence 5', solve([['begin'], ['replace', [1]], ['commit'], ['subtract', [1]], ['commit'], ['draw']], 7), [[1]])
    check('explicit sequence 6', solve([['begin'], ['replace', [1, 2]], ['resize', 2], ['commit'], ['draw']], 7), [[1]])
    check('explicit sequence 7', solve([['begin'], ['replace', [1]], ['commit'], ['resize', 3], ['draw']], 7), [[1]])
    check('explicit sequence 8', solve([['commit'], ['abort'], ['draw']], 7), [[0, 1, 2, 3, 4, 5, 6]])
    check('explicit sequence 9', solve([['begin'], ['replace', []], ['commit'], ['draw']], 7), [[]])
    check('explicit sequence 10', solve([['begin'], ['replace', []], ['commit'], ['begin'], ['add', [0]], ['commit'], ['draw']], 7), [[0]])
    check('explicit sequence 11', solve([['begin'], ['replace', []], ['begin'], ['add', [0]], ['commit'], ['draw']], 7), [[0]])
    check('explicit sequence 12', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['add', [1]], ['commit'], ['draw']], 7), [[0, 1]])
    check('explicit sequence 13', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['subtract', [0]], ['abort'], ['draw']], 7), [[0]])
if N == 5:
    check('explicit sequence 0', solve([['begin'], ['subtract', [0]], ['draw'], ['commit'], ['draw']], 8), [[0, 1, 2, 3, 4, 5, 6, 7], [1, 2, 3, 4, 5, 6, 7]])
    check('explicit sequence 1', solve([['begin'], ['subtract', [0]], ['begin'], ['subtract', [1]], ['commit'], ['draw']], 8), [[2, 3, 4, 5, 6, 7]])
    check('explicit sequence 2', solve([['begin'], ['replace', [0]], ['add', [1, 99, -1]], ['commit'], ['draw']], 8), [[0, 1]])
    check('explicit sequence 3', solve([['begin'], ['replace', [0]], ['replace', [2]], ['commit'], ['draw']], 8), [[2]])
    check('explicit sequence 4', solve([['begin'], ['replace', [0]], ['abort'], ['draw']], 8), [[0, 1, 2, 3, 4, 5, 6, 7]])
    check('explicit sequence 5', solve([['begin'], ['replace', [1]], ['commit'], ['subtract', [1]], ['commit'], ['draw']], 8), [[1]])
    check('explicit sequence 6', solve([['begin'], ['replace', [1, 2]], ['resize', 2], ['commit'], ['draw']], 8), [[1]])
    check('explicit sequence 7', solve([['begin'], ['replace', [1]], ['commit'], ['resize', 3], ['draw']], 8), [[1]])
    check('explicit sequence 8', solve([['commit'], ['abort'], ['draw']], 8), [[0, 1, 2, 3, 4, 5, 6, 7]])
    check('explicit sequence 9', solve([['begin'], ['replace', []], ['commit'], ['draw']], 8), [[]])
    check('explicit sequence 10', solve([['begin'], ['replace', []], ['commit'], ['begin'], ['add', [0]], ['commit'], ['draw']], 8), [[0]])
    check('explicit sequence 11', solve([['begin'], ['replace', []], ['begin'], ['add', [0]], ['commit'], ['draw']], 8), [[0]])
    check('explicit sequence 12', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['add', [1]], ['commit'], ['draw']], 8), [[0, 1]])
    check('explicit sequence 13', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['subtract', [0]], ['abort'], ['draw']], 8), [[0]])
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
explicit sequence 0[[1, 2, 3], [1, 2, 3]][[0, 1, 2, 3], [1, 2, 3]]Failed
explicit sequence 1[[2, 3]][[2, 3]]Passed
explicit sequence 2[[0, 1]][[0, 1]]Passed
explicit sequence 3[[2]][[2]]Passed
explicit sequence 4[[0, 1, 2, 3]][[0, 1, 2, 3]]Passed
explicit sequence 5[[1]][[1]]Passed
explicit sequence 6[[1]][[1]]Passed
explicit sequence 7[[1]][[1]]Passed
explicit sequence 8[[0, 1, 2, 3]][[0, 1, 2, 3]]Passed
explicit sequence 9[[]][[]]Passed
explicit sequence 10[[0]][[0]]Passed
explicit sequence 11[[0]][[0]]Passed
explicit sequence 12[[0, 1]][[0, 1]]Passed
explicit sequence 13[[]][[0]]Failed

SHA-256 / d3410e1438c5c241d09786a46ab76558c0f86138d26f46d3e2204bea65aa1b94

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(commands, size):
    full=set(range(size))
    current=set(full)
    pending=None
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op=='begin' and pending is None: pending=set(current) if current else None
        elif op=='subtract' and pending is not None: pending-=set(cmd[1])
        elif op=='add' and pending is not None: pending |= set(cmd[1]) & full
        elif op=='replace' and pending is not None: pending=set(cmd[1]) & full
        elif op=='commit' and pending is not None:
            current=set(pending)
            pending=None
        elif op=='abort': pending=None
        elif op=='resize':
            full=set(range(cmd[1]))
            current &= full
            if pending is not None: pending &= full
        elif op=='draw': out.append(sorted(current))
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['begin'], ['subtract', [0]], ['draw'], ['commit'], ['draw']], 4), [[0, 1, 2, 3], [1, 2, 3]])
    check('explicit sequence 1', solve([['begin'], ['subtract', [0]], ['begin'], ['subtract', [1]], ['commit'], ['draw']], 4), [[2, 3]])
    check('explicit sequence 2', solve([['begin'], ['replace', [0]], ['add', [1, 99, -1]], ['commit'], ['draw']], 4), [[0, 1]])
    check('explicit sequence 3', solve([['begin'], ['replace', [0]], ['replace', [2]], ['commit'], ['draw']], 4), [[2]])
    check('explicit sequence 4', solve([['begin'], ['replace', [0]], ['abort'], ['draw']], 4), [[0, 1, 2, 3]])
    check('explicit sequence 5', solve([['begin'], ['replace', [1]], ['commit'], ['subtract', [1]], ['commit'], ['draw']], 4), [[1]])
    check('explicit sequence 6', solve([['begin'], ['replace', [1, 2]], ['resize', 2], ['commit'], ['draw']], 4), [[1]])
    check('explicit sequence 7', solve([['begin'], ['replace', [1]], ['commit'], ['resize', 3], ['draw']], 4), [[1]])
    check('explicit sequence 8', solve([['commit'], ['abort'], ['draw']], 4), [[0, 1, 2, 3]])
    check('explicit sequence 9', solve([['begin'], ['replace', []], ['commit'], ['draw']], 4), [[]])
    check('explicit sequence 10', solve([['begin'], ['replace', []], ['commit'], ['begin'], ['add', [0]], ['commit'], ['draw']], 4), [[0]])
    check('explicit sequence 11', solve([['begin'], ['replace', []], ['begin'], ['add', [0]], ['commit'], ['draw']], 4), [[0]])
    check('explicit sequence 12', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['add', [1]], ['commit'], ['draw']], 4), [[0, 1]])
    check('explicit sequence 13', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['subtract', [0]], ['abort'], ['draw']], 4), [[0]])
if N == 2:
    check('explicit sequence 0', solve([['begin'], ['subtract', [0]], ['draw'], ['commit'], ['draw']], 5), [[0, 1, 2, 3, 4], [1, 2, 3, 4]])
    check('explicit sequence 1', solve([['begin'], ['subtract', [0]], ['begin'], ['subtract', [1]], ['commit'], ['draw']], 5), [[2, 3, 4]])
    check('explicit sequence 2', solve([['begin'], ['replace', [0]], ['add', [1, 99, -1]], ['commit'], ['draw']], 5), [[0, 1]])
    check('explicit sequence 3', solve([['begin'], ['replace', [0]], ['replace', [2]], ['commit'], ['draw']], 5), [[2]])
    check('explicit sequence 4', solve([['begin'], ['replace', [0]], ['abort'], ['draw']], 5), [[0, 1, 2, 3, 4]])
    check('explicit sequence 5', solve([['begin'], ['replace', [1]], ['commit'], ['subtract', [1]], ['commit'], ['draw']], 5), [[1]])
    check('explicit sequence 6', solve([['begin'], ['replace', [1, 2]], ['resize', 2], ['commit'], ['draw']], 5), [[1]])
    check('explicit sequence 7', solve([['begin'], ['replace', [1]], ['commit'], ['resize', 3], ['draw']], 5), [[1]])
    check('explicit sequence 8', solve([['commit'], ['abort'], ['draw']], 5), [[0, 1, 2, 3, 4]])
    check('explicit sequence 9', solve([['begin'], ['replace', []], ['commit'], ['draw']], 5), [[]])
    check('explicit sequence 10', solve([['begin'], ['replace', []], ['commit'], ['begin'], ['add', [0]], ['commit'], ['draw']], 5), [[0]])
    check('explicit sequence 11', solve([['begin'], ['replace', []], ['begin'], ['add', [0]], ['commit'], ['draw']], 5), [[0]])
    check('explicit sequence 12', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['add', [1]], ['commit'], ['draw']], 5), [[0, 1]])
    check('explicit sequence 13', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['subtract', [0]], ['abort'], ['draw']], 5), [[0]])
if N == 3:
    check('explicit sequence 0', solve([['begin'], ['subtract', [0]], ['draw'], ['commit'], ['draw']], 6), [[0, 1, 2, 3, 4, 5], [1, 2, 3, 4, 5]])
    check('explicit sequence 1', solve([['begin'], ['subtract', [0]], ['begin'], ['subtract', [1]], ['commit'], ['draw']], 6), [[2, 3, 4, 5]])
    check('explicit sequence 2', solve([['begin'], ['replace', [0]], ['add', [1, 99, -1]], ['commit'], ['draw']], 6), [[0, 1]])
    check('explicit sequence 3', solve([['begin'], ['replace', [0]], ['replace', [2]], ['commit'], ['draw']], 6), [[2]])
    check('explicit sequence 4', solve([['begin'], ['replace', [0]], ['abort'], ['draw']], 6), [[0, 1, 2, 3, 4, 5]])
    check('explicit sequence 5', solve([['begin'], ['replace', [1]], ['commit'], ['subtract', [1]], ['commit'], ['draw']], 6), [[1]])
    check('explicit sequence 6', solve([['begin'], ['replace', [1, 2]], ['resize', 2], ['commit'], ['draw']], 6), [[1]])
    check('explicit sequence 7', solve([['begin'], ['replace', [1]], ['commit'], ['resize', 3], ['draw']], 6), [[1]])
    check('explicit sequence 8', solve([['commit'], ['abort'], ['draw']], 6), [[0, 1, 2, 3, 4, 5]])
    check('explicit sequence 9', solve([['begin'], ['replace', []], ['commit'], ['draw']], 6), [[]])
    check('explicit sequence 10', solve([['begin'], ['replace', []], ['commit'], ['begin'], ['add', [0]], ['commit'], ['draw']], 6), [[0]])
    check('explicit sequence 11', solve([['begin'], ['replace', []], ['begin'], ['add', [0]], ['commit'], ['draw']], 6), [[0]])
    check('explicit sequence 12', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['add', [1]], ['commit'], ['draw']], 6), [[0, 1]])
    check('explicit sequence 13', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['subtract', [0]], ['abort'], ['draw']], 6), [[0]])
if N == 4:
    check('explicit sequence 0', solve([['begin'], ['subtract', [0]], ['draw'], ['commit'], ['draw']], 7), [[0, 1, 2, 3, 4, 5, 6], [1, 2, 3, 4, 5, 6]])
    check('explicit sequence 1', solve([['begin'], ['subtract', [0]], ['begin'], ['subtract', [1]], ['commit'], ['draw']], 7), [[2, 3, 4, 5, 6]])
    check('explicit sequence 2', solve([['begin'], ['replace', [0]], ['add', [1, 99, -1]], ['commit'], ['draw']], 7), [[0, 1]])
    check('explicit sequence 3', solve([['begin'], ['replace', [0]], ['replace', [2]], ['commit'], ['draw']], 7), [[2]])
    check('explicit sequence 4', solve([['begin'], ['replace', [0]], ['abort'], ['draw']], 7), [[0, 1, 2, 3, 4, 5, 6]])
    check('explicit sequence 5', solve([['begin'], ['replace', [1]], ['commit'], ['subtract', [1]], ['commit'], ['draw']], 7), [[1]])
    check('explicit sequence 6', solve([['begin'], ['replace', [1, 2]], ['resize', 2], ['commit'], ['draw']], 7), [[1]])
    check('explicit sequence 7', solve([['begin'], ['replace', [1]], ['commit'], ['resize', 3], ['draw']], 7), [[1]])
    check('explicit sequence 8', solve([['commit'], ['abort'], ['draw']], 7), [[0, 1, 2, 3, 4, 5, 6]])
    check('explicit sequence 9', solve([['begin'], ['replace', []], ['commit'], ['draw']], 7), [[]])
    check('explicit sequence 10', solve([['begin'], ['replace', []], ['commit'], ['begin'], ['add', [0]], ['commit'], ['draw']], 7), [[0]])
    check('explicit sequence 11', solve([['begin'], ['replace', []], ['begin'], ['add', [0]], ['commit'], ['draw']], 7), [[0]])
    check('explicit sequence 12', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['add', [1]], ['commit'], ['draw']], 7), [[0, 1]])
    check('explicit sequence 13', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['subtract', [0]], ['abort'], ['draw']], 7), [[0]])
if N == 5:
    check('explicit sequence 0', solve([['begin'], ['subtract', [0]], ['draw'], ['commit'], ['draw']], 8), [[0, 1, 2, 3, 4, 5, 6, 7], [1, 2, 3, 4, 5, 6, 7]])
    check('explicit sequence 1', solve([['begin'], ['subtract', [0]], ['begin'], ['subtract', [1]], ['commit'], ['draw']], 8), [[2, 3, 4, 5, 6, 7]])
    check('explicit sequence 2', solve([['begin'], ['replace', [0]], ['add', [1, 99, -1]], ['commit'], ['draw']], 8), [[0, 1]])
    check('explicit sequence 3', solve([['begin'], ['replace', [0]], ['replace', [2]], ['commit'], ['draw']], 8), [[2]])
    check('explicit sequence 4', solve([['begin'], ['replace', [0]], ['abort'], ['draw']], 8), [[0, 1, 2, 3, 4, 5, 6, 7]])
    check('explicit sequence 5', solve([['begin'], ['replace', [1]], ['commit'], ['subtract', [1]], ['commit'], ['draw']], 8), [[1]])
    check('explicit sequence 6', solve([['begin'], ['replace', [1, 2]], ['resize', 2], ['commit'], ['draw']], 8), [[1]])
    check('explicit sequence 7', solve([['begin'], ['replace', [1]], ['commit'], ['resize', 3], ['draw']], 8), [[1]])
    check('explicit sequence 8', solve([['commit'], ['abort'], ['draw']], 8), [[0, 1, 2, 3, 4, 5, 6, 7]])
    check('explicit sequence 9', solve([['begin'], ['replace', []], ['commit'], ['draw']], 8), [[]])
    check('explicit sequence 10', solve([['begin'], ['replace', []], ['commit'], ['begin'], ['add', [0]], ['commit'], ['draw']], 8), [[0]])
    check('explicit sequence 11', solve([['begin'], ['replace', []], ['begin'], ['add', [0]], ['commit'], ['draw']], 8), [[0]])
    check('explicit sequence 12', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['add', [1]], ['commit'], ['draw']], 8), [[0, 1]])
    check('explicit sequence 13', solve([['begin'], ['replace', [0]], ['commit'], ['begin'], ['subtract', [0]], ['abort'], ['draw']], 8), [[0]])
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
explicit sequence 0[[0, 1, 2, 3], [1, 2, 3]][[0, 1, 2, 3], [1, 2, 3]]Passed
explicit sequence 1[[2, 3]][[2, 3]]Passed
explicit sequence 2[[0, 1]][[0, 1]]Passed
explicit sequence 3[[2]][[2]]Passed
explicit sequence 4[[0, 1, 2, 3]][[0, 1, 2, 3]]Passed
explicit sequence 5[[1]][[1]]Passed
explicit sequence 6[[1]][[1]]Passed
explicit sequence 7[[1]][[1]]Passed
explicit sequence 8[[0, 1, 2, 3]][[0, 1, 2, 3]]Passed
explicit sequence 9[[]][[]]Passed
explicit sequence 10[[]][[0]]Failed
explicit sequence 11[[0]][[0]]Passed
explicit sequence 12[[0, 1]][[0, 1]]Passed
explicit sequence 13[[0]][[0]]Passed

SHA-256 / 04d893bd6b7a0b5448420fc7021fd5a922aca31f9133fbbb6c23116408809e19

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 14 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

Finite one-dimensional integer sample sets model coverage state only; no geometric intersection, memory layout, GPU or graphics-standard 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 2026-09-29T14:45:09.089630+00:00.

Case digest / 2e030ddf925c6a39de4575d88679c2a66ad08470080c2d43666a4d23b7881675