FA-50691 / Raster clipping / Open access
Layer clip isolation: draw replace · case 01
Successive child draws erase previous layer coverage.
ROOT CAUSE
Successive child draws erase previous layer coverage.
VERIFIED REPAIR
Apply the documented state transition at draw replace. A layer captures the parent clip and starts with its own full local clip. Child drawing accumulates coverage in that layer; layer completion intersects child coverage with the saved parent clip. Discard removes the layer without publishing. A layer-local clear erases only its accumulated coverage. Parent clip edits after opening cannot change the captured parent clip.
Unsuccessful approach: Exclusive accumulation preserves disjoint draws but removes overlapping coverage.
Case contract
A layer captures the parent clip and starts with its own full local clip. Child drawing accumulates coverage in that layer; layer completion intersects child coverage with the saved parent clip. Discard removes the layer without publishing. A layer-local clear erases only its accumulated coverage. Parent clip edits after opening cannot change the captured parent clip.
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))
clip=set(full)
coverage=set()
stack=[]
out=[]
for cmd in commands:
op=cmd[0]
if op=='clip': clip &= set(cmd[1])
elif op=='replace': clip=set(cmd[1]) & full
elif op=='begin':
stack.append((set(clip),set(coverage)))
clip=set(full)
coverage=set()
elif op=='draw': coverage = set(cmd[1]) & clip
elif op=='clear': coverage.clear()
elif op=='end' and stack:
parent_clip,parent_coverage=stack.pop()
coverage=parent_coverage | (coverage & parent_clip)
clip=parent_clip
elif op=='discard' and stack: clip,coverage=stack.pop()
elif op=='inspect': out.append(sorted(coverage))
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([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 4), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 4), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 4), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 4), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 4), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 4), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 4), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 4), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 4), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 4), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 4), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 4), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 4), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 4), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 4), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 4), [[0, 1, 2, 3]])
if N == 2:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 5), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 5), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 5), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 5), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 5), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 5), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 5), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 5), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 5), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 5), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 5), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 5), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 5), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 5), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 5), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 5), [[0, 1, 2, 3, 4]])
if N == 3:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 6), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 6), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 6), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 6), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 6), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 6), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 6), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 6), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 6), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 6), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 6), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 6), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 6), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 6), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 6), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 6), [[0, 1, 2, 3, 4, 5]])
if N == 4:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 7), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 7), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 7), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 7), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 7), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 7), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 7), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 7), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 7), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 7), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 7), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 7), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 7), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 7), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 7), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 7), [[0, 1, 2, 3, 4, 5, 6]])
if N == 5:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 8), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 8), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 8), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 8), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 8), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 8), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 8), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 8), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 8), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 8), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 8), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 8), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 8), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 8), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 8), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 8), [[0, 1, 2, 3, 4, 5, 6, 7]])
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 |
|---|---|---|---|
| explicit sequence 0 | [[1], []] | [[1], []] | Passed |
| explicit sequence 1 | [[]] | [[]] | Passed |
| explicit sequence 2 | [[1]] | [[0, 1]] | Failed |
| explicit sequence 3 | [[1]] | [[1]] | Passed |
| explicit sequence 4 | [[1]] | [[1]] | Passed |
| explicit sequence 5 | [[0]] | [[0]] | Passed |
| explicit sequence 6 | [[0, 1]] | [[0, 1]] | Passed |
| explicit sequence 7 | [[]] | [[]] | Passed |
| explicit sequence 8 | [[0]] | [[0]] | Passed |
| explicit sequence 9 | [[1], [0, 1]] | [[1], [0, 1]] | Passed |
| explicit sequence 10 | [[0, 1]] | [[0, 1]] | Passed |
| explicit sequence 11 | [[]] | [[]] | Passed |
| explicit sequence 12 | [[0]] | [[0]] | Passed |
| explicit sequence 13 | [[0, 1]] | [[0, 1]] | Passed |
| explicit sequence 14 | [[]] | [[]] | Passed |
| explicit sequence 15 | [[0, 1, 2, 3]] | [[0, 1, 2, 3]] | Passed |
SHA-256 / 82f883aaba4657b8a52ffe4c3693b3b7ff39bf6179cd6b4466400a9f26c1a326
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))
clip=set(full)
coverage=set()
stack=[]
out=[]
for cmd in commands:
op=cmd[0]
if op=='clip': clip &= set(cmd[1])
elif op=='replace': clip=set(cmd[1]) & full
elif op=='begin':
stack.append((set(clip),set(coverage)))
clip=set(full)
coverage=set()
elif op=='draw': coverage ^= set(cmd[1]) & clip
elif op=='clear': coverage.clear()
elif op=='end' and stack:
parent_clip,parent_coverage=stack.pop()
coverage=parent_coverage | (coverage & parent_clip)
clip=parent_clip
elif op=='discard' and stack: clip,coverage=stack.pop()
elif op=='inspect': out.append(sorted(coverage))
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([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 4), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 4), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 4), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 4), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 4), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 4), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 4), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 4), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 4), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 4), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 4), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 4), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 4), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 4), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 4), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 4), [[0, 1, 2, 3]])
if N == 2:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 5), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 5), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 5), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 5), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 5), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 5), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 5), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 5), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 5), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 5), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 5), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 5), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 5), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 5), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 5), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 5), [[0, 1, 2, 3, 4]])
if N == 3:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 6), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 6), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 6), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 6), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 6), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 6), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 6), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 6), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 6), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 6), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 6), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 6), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 6), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 6), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 6), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 6), [[0, 1, 2, 3, 4, 5]])
if N == 4:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 7), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 7), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 7), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 7), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 7), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 7), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 7), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 7), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 7), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 7), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 7), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 7), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 7), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 7), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 7), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 7), [[0, 1, 2, 3, 4, 5, 6]])
if N == 5:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 8), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 8), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 8), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 8), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 8), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 8), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 8), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 8), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 8), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 8), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 8), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 8), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 8), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 8), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 8), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 8), [[0, 1, 2, 3, 4, 5, 6, 7]])
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 |
|---|---|---|---|
| explicit sequence 0 | [[1], []] | [[1], []] | Passed |
| explicit sequence 1 | [[]] | [[]] | Passed |
| explicit sequence 2 | [[0, 1]] | [[0, 1]] | Passed |
| explicit sequence 3 | [[1]] | [[1]] | Passed |
| explicit sequence 4 | [[1]] | [[1]] | Passed |
| explicit sequence 5 | [[0]] | [[0]] | Passed |
| explicit sequence 6 | [[0, 1]] | [[0, 1]] | Passed |
| explicit sequence 7 | [[]] | [[]] | Passed |
| explicit sequence 8 | [[0]] | [[0]] | Passed |
| explicit sequence 9 | [[1], [0, 1]] | [[1], [0, 1]] | Passed |
| explicit sequence 10 | [[1]] | [[0, 1]] | Failed |
| explicit sequence 11 | [[]] | [[]] | Passed |
| explicit sequence 12 | [[0]] | [[0]] | Passed |
| explicit sequence 13 | [[0, 1]] | [[0, 1]] | Passed |
| explicit sequence 14 | [[]] | [[]] | Passed |
| explicit sequence 15 | [[0, 1, 2, 3]] | [[0, 1, 2, 3]] | Passed |
SHA-256 / aaafed28fec5498f107288cd59f24d831d7be2764a409e741147f93e4224166e
3 / The verified repair
Exit 0"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(commands, size):
full=set(range(size))
clip=set(full)
coverage=set()
stack=[]
out=[]
for cmd in commands:
op=cmd[0]
if op=='clip': clip &= set(cmd[1])
elif op=='replace': clip=set(cmd[1]) & full
elif op=='begin':
stack.append((set(clip),set(coverage)))
clip=set(full)
coverage=set()
elif op=='draw': coverage |= set(cmd[1]) & clip
elif op=='clear': coverage.clear()
elif op=='end' and stack:
parent_clip,parent_coverage=stack.pop()
coverage=parent_coverage | (coverage & parent_clip)
clip=parent_clip
elif op=='discard' and stack: clip,coverage=stack.pop()
elif op=='inspect': out.append(sorted(coverage))
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([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 4), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 4), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 4), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 4), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 4), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 4), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 4), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 4), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 4), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 4), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 4), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 4), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 4), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 4), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 4), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 4), [[0, 1, 2, 3]])
if N == 2:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 5), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 5), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 5), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 5), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 5), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 5), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 5), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 5), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 5), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 5), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 5), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 5), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 5), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 5), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 5), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 5), [[0, 1, 2, 3, 4]])
if N == 3:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 6), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 6), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 6), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 6), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 6), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 6), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 6), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 6), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 6), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 6), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 6), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 6), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 6), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 6), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 6), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 6), [[0, 1, 2, 3, 4, 5]])
if N == 4:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 7), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 7), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 7), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 7), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 7), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 7), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 7), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 7), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 7), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 7), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 7), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 7), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 7), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 7), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 7), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 7), [[0, 1, 2, 3, 4, 5, 6]])
if N == 5:
check('explicit sequence 0', solve([['replace', [0]], ['begin'], ['draw', [1]], ['inspect'], ['end'], ['inspect']], 8), [[1], []])
check('explicit sequence 1', solve([['draw', [0]], ['begin'], ['inspect']], 8), [[]])
check('explicit sequence 2', solve([['begin'], ['draw', [0]], ['draw', [1]], ['inspect']], 8), [[0, 1]])
check('explicit sequence 3', solve([['begin'], ['replace', [1]], ['draw', [0, 1]], ['inspect']], 8), [[1]])
check('explicit sequence 4', solve([['begin'], ['draw', [0]], ['clear'], ['draw', [1]], ['inspect']], 8), [[1]])
check('explicit sequence 5', solve([['replace', [0]], ['begin'], ['draw', [0, 1]], ['end'], ['inspect']], 8), [[0]])
check('explicit sequence 6', solve([['draw', [0]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 8), [[0, 1]])
check('explicit sequence 7', solve([['replace', [0]], ['begin'], ['end'], ['draw', [1]], ['inspect']], 8), [[]])
check('explicit sequence 8', solve([['draw', [0]], ['begin'], ['draw', [1]], ['discard'], ['inspect']], 8), [[0]])
check('explicit sequence 9', solve([['replace', [0, 1]], ['draw', [0]], ['begin'], ['replace', [1]], ['begin'], ['draw', [1, 2]], ['end'], ['inspect'], ['end'], ['inspect']], 8), [[1], [0, 1]])
check('explicit sequence 10', solve([['draw', [0]], ['draw', [0, 1]], ['inspect']], 8), [[0, 1]])
check('explicit sequence 11', solve([['replace', []], ['draw', [0]], ['inspect']], 8), [[]])
check('explicit sequence 12', solve([['replace', [0]], ['draw', [0]], ['clear'], ['draw', [0, 1]], ['inspect']], 8), [[0]])
check('explicit sequence 13', solve([['draw', [0]], ['replace', [1]], ['begin'], ['draw', [1]], ['end'], ['inspect']], 8), [[0, 1]])
check('explicit sequence 14', solve([['replace', []], ['begin'], ['end'], ['draw', [1]], ['inspect']], 8), [[]])
check('explicit sequence 15', solve([['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['inspect']], 8), [[0, 1, 2, 3, 4, 5, 6, 7]])
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 |
|---|---|---|---|
| explicit sequence 0 | [[1], []] | [[1], []] | Passed |
| explicit sequence 1 | [[]] | [[]] | Passed |
| explicit sequence 2 | [[0, 1]] | [[0, 1]] | Passed |
| explicit sequence 3 | [[1]] | [[1]] | Passed |
| explicit sequence 4 | [[1]] | [[1]] | Passed |
| explicit sequence 5 | [[0]] | [[0]] | Passed |
| explicit sequence 6 | [[0, 1]] | [[0, 1]] | Passed |
| explicit sequence 7 | [[]] | [[]] | Passed |
| explicit sequence 8 | [[0]] | [[0]] | Passed |
| explicit sequence 9 | [[1], [0, 1]] | [[1], [0, 1]] | Passed |
| explicit sequence 10 | [[0, 1]] | [[0, 1]] | Passed |
| explicit sequence 11 | [[]] | [[]] | Passed |
| explicit sequence 12 | [[0]] | [[0]] | Passed |
| explicit sequence 13 | [[0, 1]] | [[0, 1]] | Passed |
| explicit sequence 14 | [[]] | [[]] | Passed |
| explicit sequence 15 | [[0, 1, 2, 3]] | [[0, 1, 2, 3]] | Passed |
SHA-256 / 1b6f65e20cc6dbf91741ea768362eaae0bb4ba64d585538d65c37a73e5df185a
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 2026-09-29T14:45:11.571247+00:00.
Case digest / be7696140604520d67772e1e8dcaece848297aa91d65686283e2a924b490d05a