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FA-50611 / Raster clipping / Open access

Stencil clip pass: keep clears · case 01

The keep operation clears clip nesting counts.

Verified by executionVariant 1 · 16 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The keep operation clears clip nesting counts.

THE FAILURE

The keep operation clears clip nesting counts.

Unsuccessful approach: Keeping only comparison-visible bits erases stencil planes outside the read mask.

Case contract

Finite integer stencil values use three low bits. A clip pass compares masked stored values to masked reference, then applies distinct pass/fail operations only inside the incoming coverage set. Write masking preserves unrelated bits. Supported operations keep, zero, replace, saturating increment/decrement and invert.

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):
    values=[0]*size
    out=[]
    for cmd in commands:
        if cmd[0]=='seed': values=[cmd[1][i%len(cmd[1])] & 7 for i in range(size)]; continue
        mask,reference,readmask,writemask,comparison,onpass,onfail=cmd
        for i in range(size):
            if i not in mask: continue
            old=values[i]
            left=old & readmask
            right=reference & readmask
            passed=(left==right if comparison=='equal' else left<right if comparison=='less' else left!=right)
            op=onpass if passed else onfail
            if op=='keep': new=0
            elif op=='zero': new=0
            elif op=='replace': new=reference
            elif op=='inc': new=min(7,old+1)
            elif op=='dec': new=max(0,old-1)
            else: new=old^7
            values[i]=((old & (~writemask & 7)) | (new & writemask)) & 7
        out.append(list(values))
    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([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 4), [[1, 2, 7, 0]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 4), [[0, 0, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 4), [[2, 2, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 4), [[4, 4, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 4), [[7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 4), [[0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 4), [[4, 4, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 4), [[7, 7, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 4), [[0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 4), [[2, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 4), [[0, 1, 0, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 4), [[2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 4), [[5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 4), [[6, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 4), [[4, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 4), [[2, 5, 5, 5]])
if N == 2:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 5), [[1, 2, 7, 0, 1]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 5), [[0, 0, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 5), [[2, 2, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 5), [[4, 4, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 5), [[7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 5), [[0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 5), [[4, 4, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 5), [[7, 7, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 5), [[0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 5), [[2, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 5), [[0, 1, 0, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 5), [[2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 5), [[5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 5), [[6, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 5), [[4, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 5), [[2, 5, 5, 5, 5]])
if N == 3:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 6), [[1, 2, 7, 0, 1, 2]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 6), [[0, 0, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 6), [[2, 2, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 6), [[4, 4, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 6), [[7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 6), [[0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 6), [[4, 4, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 6), [[7, 7, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 6), [[0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 6), [[2, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 6), [[0, 1, 0, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 6), [[2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 6), [[5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 6), [[6, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 6), [[4, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 6), [[2, 5, 5, 5, 5, 5]])
if N == 4:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 7), [[1, 2, 7, 0, 1, 2, 7]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 7), [[0, 0, 5, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 7), [[2, 2, 1, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 7), [[4, 4, 0, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 7), [[7, 7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 7), [[0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 7), [[4, 4, 3, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 7), [[7, 7, 6, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 7), [[0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 7), [[2, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 7), [[0, 1, 0, 1, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 7), [[2, 2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 7), [[5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 7), [[6, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 7), [[4, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 7), [[2, 5, 5, 5, 5, 5, 5]])
if N == 5:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 8), [[1, 2, 7, 0, 1, 2, 7, 0]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 8), [[0, 0, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 8), [[2, 2, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 8), [[4, 4, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 8), [[7, 7, 7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 8), [[0, 0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 8), [[4, 4, 3, 3, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 8), [[7, 7, 6, 6, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 8), [[0, 0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 8), [[2, 1, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 8), [[0, 1, 0, 1, 1, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 8), [[2, 2, 2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 8), [[5, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 8), [[6, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 8), [[4, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 8), [[2, 5, 5, 5, 5, 5, 5, 5]])
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, 2, 7, 0]][[1, 2, 7, 0]]Failed
explicit sequence 1[[0, 0, 5, 5]][[0, 0, 5, 5]]Passed
explicit sequence 2[[2, 2, 1, 1]][[2, 2, 1, 1]]Passed
explicit sequence 3[[4, 4, 0, 0]][[4, 4, 0, 0]]Passed
explicit sequence 4[[7, 7, 7, 7]][[7, 7, 7, 7]]Passed
explicit sequence 5[[0, 0, 0, 0]][[0, 0, 0, 0]]Passed
explicit sequence 6[[4, 4, 3, 3]][[4, 4, 3, 3]]Passed
explicit sequence 7[[7, 7, 6, 6]][[7, 7, 6, 6]]Passed
explicit sequence 8[[0, 0, 0, 0]][[0, 0, 0, 0]]Passed
explicit sequence 9[[2, 1, 1, 1]][[2, 1, 1, 1]]Passed
explicit sequence 10[[0, 1, 0, 1]][[0, 1, 0, 1]]Passed
explicit sequence 11[[0, 2, 2, 2]][[2, 2, 2, 2]]Failed
explicit sequence 12[[0, 5, 5, 5]][[5, 5, 5, 5]]Failed
explicit sequence 13[[6, 5, 5, 5]][[6, 5, 5, 5]]Passed
explicit sequence 14[[4, 5, 5, 5]][[4, 5, 5, 5]]Passed
explicit sequence 15[[2, 5, 5, 5]][[2, 5, 5, 5]]Passed

SHA-256 / d94cf28f844843f8d39dc8af5b6193918f4f765388ddc4bfa8c4825a686991eb

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(commands, size):
    values=[0]*size
    out=[]
    for cmd in commands:
        if cmd[0]=='seed': values=[cmd[1][i%len(cmd[1])] & 7 for i in range(size)]; continue
        mask,reference,readmask,writemask,comparison,onpass,onfail=cmd
        for i in range(size):
            if i not in mask: continue
            old=values[i]
            left=old & readmask
            right=reference & readmask
            passed=(left==right if comparison=='equal' else left<right if comparison=='less' else left!=right)
            op=onpass if passed else onfail
            if op=='keep': new=left
            elif op=='zero': new=0
            elif op=='replace': new=reference
            elif op=='inc': new=min(7,old+1)
            elif op=='dec': new=max(0,old-1)
            else: new=old^7
            values[i]=((old & (~writemask & 7)) | (new & writemask)) & 7
        out.append(list(values))
    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([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 4), [[1, 2, 7, 0]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 4), [[0, 0, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 4), [[2, 2, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 4), [[4, 4, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 4), [[7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 4), [[0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 4), [[4, 4, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 4), [[7, 7, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 4), [[0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 4), [[2, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 4), [[0, 1, 0, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 4), [[2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 4), [[5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 4), [[6, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 4), [[4, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 4), [[2, 5, 5, 5]])
if N == 2:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 5), [[1, 2, 7, 0, 1]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 5), [[0, 0, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 5), [[2, 2, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 5), [[4, 4, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 5), [[7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 5), [[0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 5), [[4, 4, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 5), [[7, 7, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 5), [[0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 5), [[2, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 5), [[0, 1, 0, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 5), [[2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 5), [[5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 5), [[6, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 5), [[4, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 5), [[2, 5, 5, 5, 5]])
if N == 3:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 6), [[1, 2, 7, 0, 1, 2]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 6), [[0, 0, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 6), [[2, 2, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 6), [[4, 4, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 6), [[7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 6), [[0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 6), [[4, 4, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 6), [[7, 7, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 6), [[0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 6), [[2, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 6), [[0, 1, 0, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 6), [[2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 6), [[5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 6), [[6, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 6), [[4, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 6), [[2, 5, 5, 5, 5, 5]])
if N == 4:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 7), [[1, 2, 7, 0, 1, 2, 7]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 7), [[0, 0, 5, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 7), [[2, 2, 1, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 7), [[4, 4, 0, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 7), [[7, 7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 7), [[0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 7), [[4, 4, 3, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 7), [[7, 7, 6, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 7), [[0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 7), [[2, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 7), [[0, 1, 0, 1, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 7), [[2, 2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 7), [[5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 7), [[6, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 7), [[4, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 7), [[2, 5, 5, 5, 5, 5, 5]])
if N == 5:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 8), [[1, 2, 7, 0, 1, 2, 7, 0]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 8), [[0, 0, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 8), [[2, 2, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 8), [[4, 4, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 8), [[7, 7, 7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 8), [[0, 0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 8), [[4, 4, 3, 3, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 8), [[7, 7, 6, 6, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 8), [[0, 0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 8), [[2, 1, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 8), [[0, 1, 0, 1, 1, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 8), [[2, 2, 2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 8), [[5, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 8), [[6, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 8), [[4, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 8), [[2, 5, 5, 5, 5, 5, 5, 5]])
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, 7, 0]][[1, 2, 7, 0]]Passed
explicit sequence 1[[0, 0, 5, 5]][[0, 0, 5, 5]]Passed
explicit sequence 2[[2, 2, 1, 1]][[2, 2, 1, 1]]Passed
explicit sequence 3[[4, 4, 0, 0]][[4, 4, 0, 0]]Passed
explicit sequence 4[[7, 7, 7, 7]][[7, 7, 7, 7]]Passed
explicit sequence 5[[0, 0, 0, 0]][[0, 0, 0, 0]]Passed
explicit sequence 6[[4, 4, 3, 3]][[4, 4, 3, 3]]Passed
explicit sequence 7[[7, 7, 6, 6]][[7, 7, 6, 6]]Passed
explicit sequence 8[[0, 0, 0, 0]][[0, 0, 0, 0]]Passed
explicit sequence 9[[2, 1, 1, 1]][[2, 1, 1, 1]]Passed
explicit sequence 10[[0, 1, 0, 1]][[0, 1, 0, 1]]Passed
explicit sequence 11[[2, 2, 2, 2]][[2, 2, 2, 2]]Passed
explicit sequence 12[[1, 5, 5, 5]][[5, 5, 5, 5]]Failed
explicit sequence 13[[6, 5, 5, 5]][[6, 5, 5, 5]]Passed
explicit sequence 14[[4, 5, 5, 5]][[4, 5, 5, 5]]Passed
explicit sequence 15[[2, 5, 5, 5]][[2, 5, 5, 5]]Passed

SHA-256 / 3d329a51cca58114426d76cb15092c14c7966bd92fdbc6da0750cdd1b9036772

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 16 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 2026-09-29T14:45:10.894429+00:00.

Case digest / 23e9d47bef93614a7b4b83f8df010a45ffb33daf83345af30f015cdeb66d1cce