FAILURE MAP
← Case archive

FA-51421 / Raster clipping / Open access

Pick buffer clip coverage: query outside · case 01

Out-of-target picking clamps to an edge object instead of returning no hit.

Verified by executionVariant 1 · 11 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Out-of-target picking clamps to an edge object instead of returning no hit.

THE FAILURE

Out-of-target picking clamps to an edge object instead of returning no hit.

Unsuccessful approach: Allowing Python negative indexing turns negative query coordinates into valid hits.

Case contract

Each draw has an object ID, coverage samples, clip samples, integer depth, depth-test flag and ID-write flag. ID zero is a valid object. Pick samples start empty with infinite depth. With depth test enabled, strictly nearer fragments replace stored IDs and depth; equal depth keeps the earlier fragment. Disabled depth testing writes without changing depth. ID-write-disabled draws still update depth when tested. Queries return IDs or null for out-of-target samples.

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))
    ids=[None]*size
    depths=[float('inf')]*size
    out=[]
    for cmd in commands:
        if cmd[0]=='clear':
            for x in set(cmd[1])&full: ids[x]=None; depths[x]=float('inf')
        elif cmd[0]=='draw':
            _,key,coverage,clip,depth,test,write=cmd
            for x in set(coverage)&set(clip)&full:
                if test and depth>=depths[x]: continue
                if test: depths[x]=depth
                if write: ids[x]=key
        else:
            out.append([ids[min(size-1,max(0,x))] for x in cmd[1]])
    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([['draw', 'a', [0, 1], [0], 3, True, True], ['read', [0, 1]]], 4), [['a', None]])
    check('explicit sequence 1', solve([['draw', 'a', [0], [0], 3, True, True], ['draw', 'b', [0], [0], 3, True, True], ['read', [0]]], 4), [['a']])
    check('explicit sequence 2', solve([['draw', 'a', [0], [0], 1, False, True], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 4), [['b']])
    check('explicit sequence 3', solve([['draw', 'a', [0], [0], 1, True, False], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 4), [[None]])
    check('explicit sequence 4', solve([['draw', 0, [0], [0], 1, True, True], ['read', [0]]], 4), [[0]])
    check('explicit sequence 5', solve([['draw', 'a', [0], [0], 1, False, False], ['read', [0]]], 4), [[None]])
    check('explicit sequence 6', solve([['draw', 'a', [0], [0], 1, True, True], ['clear', [0]], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 4), [['b']])
    check('explicit sequence 7', solve([['draw', 'a', [0, 1], [0, 1], 1, True, True], ['clear', [0]], ['read', [0, 1]], ['clear', []], ['read', [1]]], 4), [[None, 'a'], ['a']])
    check('explicit sequence 8', solve([['draw', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 1, True, True], ['read', [-1, 0, 99, 7]]], 4), [[None, 'a', None, None]])
    check('explicit sequence 9', solve([['draw', 'a', [0], [0], 1, True, True], ['draw', 'b', [1], [1], 1, True, True], ['read', [1, 0, 1]]], 4), [['b', 'a', 'b']])
    check('explicit sequence 10', solve([['draw', 'a', [0], [], 1, True, True], ['read', [0]]], 4), [[None]])
if N == 2:
    check('explicit sequence 0', solve([['draw', 'a', [0, 1], [0], 3, True, True], ['read', [0, 1]]], 5), [['a', None]])
    check('explicit sequence 1', solve([['draw', 'a', [0], [0], 3, True, True], ['draw', 'b', [0], [0], 3, True, True], ['read', [0]]], 5), [['a']])
    check('explicit sequence 2', solve([['draw', 'a', [0], [0], 1, False, True], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 5), [['b']])
    check('explicit sequence 3', solve([['draw', 'a', [0], [0], 1, True, False], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 5), [[None]])
    check('explicit sequence 4', solve([['draw', 0, [0], [0], 1, True, True], ['read', [0]]], 5), [[0]])
    check('explicit sequence 5', solve([['draw', 'a', [0], [0], 1, False, False], ['read', [0]]], 5), [[None]])
    check('explicit sequence 6', solve([['draw', 'a', [0], [0], 1, True, True], ['clear', [0]], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 5), [['b']])
    check('explicit sequence 7', solve([['draw', 'a', [0, 1], [0, 1], 1, True, True], ['clear', [0]], ['read', [0, 1]], ['clear', []], ['read', [1]]], 5), [[None, 'a'], ['a']])
    check('explicit sequence 8', solve([['draw', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 1, True, True], ['read', [-1, 0, 99, 7]]], 5), [[None, 'a', None, None]])
    check('explicit sequence 9', solve([['draw', 'a', [0], [0], 1, True, True], ['draw', 'b', [1], [1], 1, True, True], ['read', [1, 0, 1]]], 5), [['b', 'a', 'b']])
    check('explicit sequence 10', solve([['draw', 'a', [0], [], 1, True, True], ['read', [0]]], 5), [[None]])
if N == 3:
    check('explicit sequence 0', solve([['draw', 'a', [0, 1], [0], 3, True, True], ['read', [0, 1]]], 6), [['a', None]])
    check('explicit sequence 1', solve([['draw', 'a', [0], [0], 3, True, True], ['draw', 'b', [0], [0], 3, True, True], ['read', [0]]], 6), [['a']])
    check('explicit sequence 2', solve([['draw', 'a', [0], [0], 1, False, True], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 6), [['b']])
    check('explicit sequence 3', solve([['draw', 'a', [0], [0], 1, True, False], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 6), [[None]])
    check('explicit sequence 4', solve([['draw', 0, [0], [0], 1, True, True], ['read', [0]]], 6), [[0]])
    check('explicit sequence 5', solve([['draw', 'a', [0], [0], 1, False, False], ['read', [0]]], 6), [[None]])
    check('explicit sequence 6', solve([['draw', 'a', [0], [0], 1, True, True], ['clear', [0]], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 6), [['b']])
    check('explicit sequence 7', solve([['draw', 'a', [0, 1], [0, 1], 1, True, True], ['clear', [0]], ['read', [0, 1]], ['clear', []], ['read', [1]]], 6), [[None, 'a'], ['a']])
    check('explicit sequence 8', solve([['draw', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 1, True, True], ['read', [-1, 0, 99, 7]]], 6), [[None, 'a', None, None]])
    check('explicit sequence 9', solve([['draw', 'a', [0], [0], 1, True, True], ['draw', 'b', [1], [1], 1, True, True], ['read', [1, 0, 1]]], 6), [['b', 'a', 'b']])
    check('explicit sequence 10', solve([['draw', 'a', [0], [], 1, True, True], ['read', [0]]], 6), [[None]])
if N == 4:
    check('explicit sequence 0', solve([['draw', 'a', [0, 1], [0], 3, True, True], ['read', [0, 1]]], 7), [['a', None]])
    check('explicit sequence 1', solve([['draw', 'a', [0], [0], 3, True, True], ['draw', 'b', [0], [0], 3, True, True], ['read', [0]]], 7), [['a']])
    check('explicit sequence 2', solve([['draw', 'a', [0], [0], 1, False, True], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 7), [['b']])
    check('explicit sequence 3', solve([['draw', 'a', [0], [0], 1, True, False], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 7), [[None]])
    check('explicit sequence 4', solve([['draw', 0, [0], [0], 1, True, True], ['read', [0]]], 7), [[0]])
    check('explicit sequence 5', solve([['draw', 'a', [0], [0], 1, False, False], ['read', [0]]], 7), [[None]])
    check('explicit sequence 6', solve([['draw', 'a', [0], [0], 1, True, True], ['clear', [0]], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 7), [['b']])
    check('explicit sequence 7', solve([['draw', 'a', [0, 1], [0, 1], 1, True, True], ['clear', [0]], ['read', [0, 1]], ['clear', []], ['read', [1]]], 7), [[None, 'a'], ['a']])
    check('explicit sequence 8', solve([['draw', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 1, True, True], ['read', [-1, 0, 99, 7]]], 7), [[None, 'a', None, None]])
    check('explicit sequence 9', solve([['draw', 'a', [0], [0], 1, True, True], ['draw', 'b', [1], [1], 1, True, True], ['read', [1, 0, 1]]], 7), [['b', 'a', 'b']])
    check('explicit sequence 10', solve([['draw', 'a', [0], [], 1, True, True], ['read', [0]]], 7), [[None]])
if N == 5:
    check('explicit sequence 0', solve([['draw', 'a', [0, 1], [0], 3, True, True], ['read', [0, 1]]], 8), [['a', None]])
    check('explicit sequence 1', solve([['draw', 'a', [0], [0], 3, True, True], ['draw', 'b', [0], [0], 3, True, True], ['read', [0]]], 8), [['a']])
    check('explicit sequence 2', solve([['draw', 'a', [0], [0], 1, False, True], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 8), [['b']])
    check('explicit sequence 3', solve([['draw', 'a', [0], [0], 1, True, False], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 8), [[None]])
    check('explicit sequence 4', solve([['draw', 0, [0], [0], 1, True, True], ['read', [0]]], 8), [[0]])
    check('explicit sequence 5', solve([['draw', 'a', [0], [0], 1, False, False], ['read', [0]]], 8), [[None]])
    check('explicit sequence 6', solve([['draw', 'a', [0], [0], 1, True, True], ['clear', [0]], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 8), [['b']])
    check('explicit sequence 7', solve([['draw', 'a', [0, 1], [0, 1], 1, True, True], ['clear', [0]], ['read', [0, 1]], ['clear', []], ['read', [1]]], 8), [[None, 'a'], ['a']])
    check('explicit sequence 8', solve([['draw', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 1, True, True], ['read', [-1, 0, 99, 7]]], 8), [[None, 'a', None, 'a']])
    check('explicit sequence 9', solve([['draw', 'a', [0], [0], 1, True, True], ['draw', 'b', [1], [1], 1, True, True], ['read', [1, 0, 1]]], 8), [['b', 'a', 'b']])
    check('explicit sequence 10', solve([['draw', 'a', [0], [], 1, True, True], ['read', [0]]], 8), [[None]])
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[['a', None]][['a', None]]Passed
explicit sequence 1[['a']][['a']]Passed
explicit sequence 2[['b']][['b']]Passed
explicit sequence 3[[None]][[None]]Passed
explicit sequence 4[[0]][[0]]Passed
explicit sequence 5[[None]][[None]]Passed
explicit sequence 6[['b']][['b']]Passed
explicit sequence 7[[None, 'a'], ['a']][[None, 'a'], ['a']]Passed
explicit sequence 8[['a', 'a', 'a', 'a']][[None, 'a', None, None]]Failed
explicit sequence 9[['b', 'a', 'b']][['b', 'a', 'b']]Passed
explicit sequence 10[[None]][[None]]Passed

SHA-256 / 0b42cb025f742968a8520ddd3300e494bcb5c8e3f3cd8d5384915b471f84ffb2

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))
    ids=[None]*size
    depths=[float('inf')]*size
    out=[]
    for cmd in commands:
        if cmd[0]=='clear':
            for x in set(cmd[1])&full: ids[x]=None; depths[x]=float('inf')
        elif cmd[0]=='draw':
            _,key,coverage,clip,depth,test,write=cmd
            for x in set(coverage)&set(clip)&full:
                if test and depth>=depths[x]: continue
                if test: depths[x]=depth
                if write: ids[x]=key
        else:
            out.append([ids[x] if -size<=x<size else None for x in cmd[1]])
    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([['draw', 'a', [0, 1], [0], 3, True, True], ['read', [0, 1]]], 4), [['a', None]])
    check('explicit sequence 1', solve([['draw', 'a', [0], [0], 3, True, True], ['draw', 'b', [0], [0], 3, True, True], ['read', [0]]], 4), [['a']])
    check('explicit sequence 2', solve([['draw', 'a', [0], [0], 1, False, True], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 4), [['b']])
    check('explicit sequence 3', solve([['draw', 'a', [0], [0], 1, True, False], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 4), [[None]])
    check('explicit sequence 4', solve([['draw', 0, [0], [0], 1, True, True], ['read', [0]]], 4), [[0]])
    check('explicit sequence 5', solve([['draw', 'a', [0], [0], 1, False, False], ['read', [0]]], 4), [[None]])
    check('explicit sequence 6', solve([['draw', 'a', [0], [0], 1, True, True], ['clear', [0]], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 4), [['b']])
    check('explicit sequence 7', solve([['draw', 'a', [0, 1], [0, 1], 1, True, True], ['clear', [0]], ['read', [0, 1]], ['clear', []], ['read', [1]]], 4), [[None, 'a'], ['a']])
    check('explicit sequence 8', solve([['draw', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 1, True, True], ['read', [-1, 0, 99, 7]]], 4), [[None, 'a', None, None]])
    check('explicit sequence 9', solve([['draw', 'a', [0], [0], 1, True, True], ['draw', 'b', [1], [1], 1, True, True], ['read', [1, 0, 1]]], 4), [['b', 'a', 'b']])
    check('explicit sequence 10', solve([['draw', 'a', [0], [], 1, True, True], ['read', [0]]], 4), [[None]])
if N == 2:
    check('explicit sequence 0', solve([['draw', 'a', [0, 1], [0], 3, True, True], ['read', [0, 1]]], 5), [['a', None]])
    check('explicit sequence 1', solve([['draw', 'a', [0], [0], 3, True, True], ['draw', 'b', [0], [0], 3, True, True], ['read', [0]]], 5), [['a']])
    check('explicit sequence 2', solve([['draw', 'a', [0], [0], 1, False, True], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 5), [['b']])
    check('explicit sequence 3', solve([['draw', 'a', [0], [0], 1, True, False], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 5), [[None]])
    check('explicit sequence 4', solve([['draw', 0, [0], [0], 1, True, True], ['read', [0]]], 5), [[0]])
    check('explicit sequence 5', solve([['draw', 'a', [0], [0], 1, False, False], ['read', [0]]], 5), [[None]])
    check('explicit sequence 6', solve([['draw', 'a', [0], [0], 1, True, True], ['clear', [0]], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 5), [['b']])
    check('explicit sequence 7', solve([['draw', 'a', [0, 1], [0, 1], 1, True, True], ['clear', [0]], ['read', [0, 1]], ['clear', []], ['read', [1]]], 5), [[None, 'a'], ['a']])
    check('explicit sequence 8', solve([['draw', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 1, True, True], ['read', [-1, 0, 99, 7]]], 5), [[None, 'a', None, None]])
    check('explicit sequence 9', solve([['draw', 'a', [0], [0], 1, True, True], ['draw', 'b', [1], [1], 1, True, True], ['read', [1, 0, 1]]], 5), [['b', 'a', 'b']])
    check('explicit sequence 10', solve([['draw', 'a', [0], [], 1, True, True], ['read', [0]]], 5), [[None]])
if N == 3:
    check('explicit sequence 0', solve([['draw', 'a', [0, 1], [0], 3, True, True], ['read', [0, 1]]], 6), [['a', None]])
    check('explicit sequence 1', solve([['draw', 'a', [0], [0], 3, True, True], ['draw', 'b', [0], [0], 3, True, True], ['read', [0]]], 6), [['a']])
    check('explicit sequence 2', solve([['draw', 'a', [0], [0], 1, False, True], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 6), [['b']])
    check('explicit sequence 3', solve([['draw', 'a', [0], [0], 1, True, False], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 6), [[None]])
    check('explicit sequence 4', solve([['draw', 0, [0], [0], 1, True, True], ['read', [0]]], 6), [[0]])
    check('explicit sequence 5', solve([['draw', 'a', [0], [0], 1, False, False], ['read', [0]]], 6), [[None]])
    check('explicit sequence 6', solve([['draw', 'a', [0], [0], 1, True, True], ['clear', [0]], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 6), [['b']])
    check('explicit sequence 7', solve([['draw', 'a', [0, 1], [0, 1], 1, True, True], ['clear', [0]], ['read', [0, 1]], ['clear', []], ['read', [1]]], 6), [[None, 'a'], ['a']])
    check('explicit sequence 8', solve([['draw', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 1, True, True], ['read', [-1, 0, 99, 7]]], 6), [[None, 'a', None, None]])
    check('explicit sequence 9', solve([['draw', 'a', [0], [0], 1, True, True], ['draw', 'b', [1], [1], 1, True, True], ['read', [1, 0, 1]]], 6), [['b', 'a', 'b']])
    check('explicit sequence 10', solve([['draw', 'a', [0], [], 1, True, True], ['read', [0]]], 6), [[None]])
if N == 4:
    check('explicit sequence 0', solve([['draw', 'a', [0, 1], [0], 3, True, True], ['read', [0, 1]]], 7), [['a', None]])
    check('explicit sequence 1', solve([['draw', 'a', [0], [0], 3, True, True], ['draw', 'b', [0], [0], 3, True, True], ['read', [0]]], 7), [['a']])
    check('explicit sequence 2', solve([['draw', 'a', [0], [0], 1, False, True], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 7), [['b']])
    check('explicit sequence 3', solve([['draw', 'a', [0], [0], 1, True, False], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 7), [[None]])
    check('explicit sequence 4', solve([['draw', 0, [0], [0], 1, True, True], ['read', [0]]], 7), [[0]])
    check('explicit sequence 5', solve([['draw', 'a', [0], [0], 1, False, False], ['read', [0]]], 7), [[None]])
    check('explicit sequence 6', solve([['draw', 'a', [0], [0], 1, True, True], ['clear', [0]], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 7), [['b']])
    check('explicit sequence 7', solve([['draw', 'a', [0, 1], [0, 1], 1, True, True], ['clear', [0]], ['read', [0, 1]], ['clear', []], ['read', [1]]], 7), [[None, 'a'], ['a']])
    check('explicit sequence 8', solve([['draw', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 1, True, True], ['read', [-1, 0, 99, 7]]], 7), [[None, 'a', None, None]])
    check('explicit sequence 9', solve([['draw', 'a', [0], [0], 1, True, True], ['draw', 'b', [1], [1], 1, True, True], ['read', [1, 0, 1]]], 7), [['b', 'a', 'b']])
    check('explicit sequence 10', solve([['draw', 'a', [0], [], 1, True, True], ['read', [0]]], 7), [[None]])
if N == 5:
    check('explicit sequence 0', solve([['draw', 'a', [0, 1], [0], 3, True, True], ['read', [0, 1]]], 8), [['a', None]])
    check('explicit sequence 1', solve([['draw', 'a', [0], [0], 3, True, True], ['draw', 'b', [0], [0], 3, True, True], ['read', [0]]], 8), [['a']])
    check('explicit sequence 2', solve([['draw', 'a', [0], [0], 1, False, True], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 8), [['b']])
    check('explicit sequence 3', solve([['draw', 'a', [0], [0], 1, True, False], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 8), [[None]])
    check('explicit sequence 4', solve([['draw', 0, [0], [0], 1, True, True], ['read', [0]]], 8), [[0]])
    check('explicit sequence 5', solve([['draw', 'a', [0], [0], 1, False, False], ['read', [0]]], 8), [[None]])
    check('explicit sequence 6', solve([['draw', 'a', [0], [0], 1, True, True], ['clear', [0]], ['draw', 'b', [0], [0], 2, True, True], ['read', [0]]], 8), [['b']])
    check('explicit sequence 7', solve([['draw', 'a', [0, 1], [0, 1], 1, True, True], ['clear', [0]], ['read', [0, 1]], ['clear', []], ['read', [1]]], 8), [[None, 'a'], ['a']])
    check('explicit sequence 8', solve([['draw', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 1, True, True], ['read', [-1, 0, 99, 7]]], 8), [[None, 'a', None, 'a']])
    check('explicit sequence 9', solve([['draw', 'a', [0], [0], 1, True, True], ['draw', 'b', [1], [1], 1, True, True], ['read', [1, 0, 1]]], 8), [['b', 'a', 'b']])
    check('explicit sequence 10', solve([['draw', 'a', [0], [], 1, True, True], ['read', [0]]], 8), [[None]])
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[['a', None]][['a', None]]Passed
explicit sequence 1[['a']][['a']]Passed
explicit sequence 2[['b']][['b']]Passed
explicit sequence 3[[None]][[None]]Passed
explicit sequence 4[[0]][[0]]Passed
explicit sequence 5[[None]][[None]]Passed
explicit sequence 6[['b']][['b']]Passed
explicit sequence 7[[None, 'a'], ['a']][[None, 'a'], ['a']]Passed
explicit sequence 8[['a', 'a', None, None]][[None, 'a', None, None]]Failed
explicit sequence 9[['b', 'a', 'b']][['b', 'a', 'b']]Passed
explicit sequence 10[[None]][[None]]Passed

SHA-256 / 69329b2c6ff3f46a9fdc4698b9aef8f2eba98825761cb41b678cd01aae72e185

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 11 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.

Sign in to the archive ↗

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 2026-09-29T14:45:18.827018+00:00.

Case digest / bb34ba75d795a13a7cc76094fcd6362bf75568dfcc8715212acd5ce188c2d1ba