FAILURE MAP
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FA-40026 / Heap invariants / Open access

Binomial carry reads the cursor rank rather than the list head · case 01

The bounded binomial carry certificate reports an incorrect current.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Binomial carry reads the cursor rank rather than the list head.

THE FAILURE

Binomial carry reads the cursor rank rather than the list head.

Unsuccessful approach: The local patch uses i if exists else None and still violates the stated relation.

Case contract

A consolidation cursor sees ordered ranks and index i. Report whether to link now, current rank, carry rank, suffix retained after a link, triple-collision deferral, and link partner. In three equal consecutive ranks defer the first pair so a carry is not consolidated twice out of order. Empty cursor is allowed.

Why this case matters

This isolates an internal heap representation or priority-structure invariant using deterministic finite records.

1 / The failure

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

N = 1
observations = []
def solve(d):
    r=d['ranks']; i=d['i']; exists=i<len(r); pair=i+1<len(r) and r[i]==r[i+1]; triple=i+2<len(r) and r[i]==r[i+1]==r[i+2]
    link=pair and not triple
    return {'link_now': link,
    'current': r[0] if r else None,
    'carry_rank': r[i]+1 if link else None,
    'suffix': r[i+2:] if link else r[i:],
    'defer': triple,
    'partner': i+1 if link else None}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = [[({'ranks': [], 'i': 0}, {'link_now': False, 'current': None, 'carry_rank': None, 'suffix': [], 'defer': False, 'partner': None}), ({'ranks': [0, 0], 'i': 0}, {'link_now': True, 'current': 0, 'carry_rank': 1, 'suffix': [], 'defer': False, 'partner': 1}), ({'ranks': [0, 0, 0, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 0, 0, 2], 'defer': True, 'partner': None}), ({'ranks': [0, 1, 1, 3], 'i': 1}, {'link_now': True, 'current': 1, 'carry_rank': 2, 'suffix': [3], 'defer': False, 'partner': 2}), ({'ranks': [1, 2, 2, 4, 5], 'i': 1}, {'link_now': True, 'current': 2, 'carry_rank': 3, 'suffix': [4, 5], 'defer': False, 'partner': 2}), ({'ranks': [0, 1, 1, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 1, 1, 2], 'defer': False, 'partner': None}), ({'ranks': [1, 2, 2, 3], 'i': 0}, {'link_now': False, 'current': 1, 'carry_rank': None, 'suffix': [1, 2, 2, 3], 'defer': False, 'partner': None})], [({'ranks': [], 'i': 0}, {'link_now': False, 'current': None, 'carry_rank': None, 'suffix': [], 'defer': False, 'partner': None}), ({'ranks': [0, 0], 'i': 0}, {'link_now': True, 'current': 0, 'carry_rank': 1, 'suffix': [], 'defer': False, 'partner': 1}), ({'ranks': [0, 0, 0, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 0, 0, 2], 'defer': True, 'partner': None}), ({'ranks': [0, 1, 1, 3], 'i': 1}, {'link_now': True, 'current': 1, 'carry_rank': 2, 'suffix': [3], 'defer': False, 'partner': 2}), ({'ranks': [1, 2, 2, 4, 5], 'i': 1}, {'link_now': True, 'current': 2, 'carry_rank': 3, 'suffix': [4, 5], 'defer': False, 'partner': 2}), ({'ranks': [0, 1, 1, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 1, 1, 2], 'defer': False, 'partner': None}), ({'ranks': [2, 3, 3, 4], 'i': 0}, {'link_now': False, 'current': 2, 'carry_rank': None, 'suffix': [2, 3, 3, 4], 'defer': False, 'partner': None})], [({'ranks': [], 'i': 0}, {'link_now': False, 'current': None, 'carry_rank': None, 'suffix': [], 'defer': False, 'partner': None}), ({'ranks': [0, 0], 'i': 0}, {'link_now': True, 'current': 0, 'carry_rank': 1, 'suffix': [], 'defer': False, 'partner': 1}), ({'ranks': [0, 0, 0, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 0, 0, 2], 'defer': True, 'partner': None}), ({'ranks': [0, 1, 1, 3], 'i': 1}, {'link_now': True, 'current': 1, 'carry_rank': 2, 'suffix': [3], 'defer': False, 'partner': 2}), ({'ranks': [1, 2, 2, 4, 5], 'i': 1}, {'link_now': True, 'current': 2, 'carry_rank': 3, 'suffix': [4, 5], 'defer': False, 'partner': 2}), ({'ranks': [0, 1, 1, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 1, 1, 2], 'defer': False, 'partner': None}), ({'ranks': [3, 4, 4, 5], 'i': 0}, {'link_now': False, 'current': 3, 'carry_rank': None, 'suffix': [3, 4, 4, 5], 'defer': False, 'partner': None})], [({'ranks': [], 'i': 0}, {'link_now': False, 'current': None, 'carry_rank': None, 'suffix': [], 'defer': False, 'partner': None}), ({'ranks': [0, 0], 'i': 0}, {'link_now': True, 'current': 0, 'carry_rank': 1, 'suffix': [], 'defer': False, 'partner': 1}), ({'ranks': [0, 0, 0, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 0, 0, 2], 'defer': True, 'partner': None}), ({'ranks': [0, 1, 1, 3], 'i': 1}, {'link_now': True, 'current': 1, 'carry_rank': 2, 'suffix': [3], 'defer': False, 'partner': 2}), ({'ranks': [1, 2, 2, 4, 5], 'i': 1}, {'link_now': True, 'current': 2, 'carry_rank': 3, 'suffix': [4, 5], 'defer': False, 'partner': 2}), ({'ranks': [0, 1, 1, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 1, 1, 2], 'defer': False, 'partner': None}), ({'ranks': [4, 5, 5, 6], 'i': 0}, {'link_now': False, 'current': 4, 'carry_rank': None, 'suffix': [4, 5, 5, 6], 'defer': False, 'partner': None})], [({'ranks': [], 'i': 0}, {'link_now': False, 'current': None, 'carry_rank': None, 'suffix': [], 'defer': False, 'partner': None}), ({'ranks': [0, 0], 'i': 0}, {'link_now': True, 'current': 0, 'carry_rank': 1, 'suffix': [], 'defer': False, 'partner': 1}), ({'ranks': [0, 0, 0, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 0, 0, 2], 'defer': True, 'partner': None}), ({'ranks': [0, 1, 1, 3], 'i': 1}, {'link_now': True, 'current': 1, 'carry_rank': 2, 'suffix': [3], 'defer': False, 'partner': 2}), ({'ranks': [1, 2, 2, 4, 5], 'i': 1}, {'link_now': True, 'current': 2, 'carry_rank': 3, 'suffix': [4, 5], 'defer': False, 'partner': 2}), ({'ranks': [0, 1, 1, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 1, 1, 2], 'defer': False, 'partner': None}), ({'ranks': [5, 6, 6, 7], 'i': 0}, {'link_now': False, 'current': 5, 'carry_rank': None, 'suffix': [5, 6, 6, 7], 'defer': False, 'partner': None})]][N-1]
check('regression certificate 1', solve(cases[0][0]), cases[0][1])
check('regression certificate 2', solve(cases[1][0]), cases[1][1])
check('regression certificate 3', solve(cases[2][0]), cases[2][1])
check('regression certificate 4', solve(cases[3][0]), cases[3][1])
check('regression certificate 5', solve(cases[4][0]), cases[4][1])
check('regression certificate 6', solve(cases[5][0]), cases[5][1])
check('variant-dependent certificate', solve(cases[6][0]), cases[6][1])
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
regression certificate 1{'carry_rank': None, 'current': None, 'defer': False, 'link_now': False, 'partner': None, 'suffix': []}{'carry_rank': None, 'current': None, 'defer': False, 'link_now': False, 'partner': None, 'suffix': []}Passed
regression certificate 2{'carry_rank': 1, 'current': 0, 'defer': False, 'link_now': True, 'partner': 1, 'suffix': []}{'carry_rank': 1, 'current': 0, 'defer': False, 'link_now': True, 'partner': 1, 'suffix': []}Passed
regression certificate 3{'carry_rank': None, 'current': 0, 'defer': True, 'link_now': False, 'partner': None, 'suffix': [0, 0, 0, 2]}{'carry_rank': None, 'current': 0, 'defer': True, 'link_now': False, 'partner': None, 'suffix': [0, 0, 0, 2]}Passed
regression certificate 4{'carry_rank': 2, 'current': 0, 'defer': False, 'link_now': True, 'partner': 2, 'suffix': [3]}{'carry_rank': 2, 'current': 1, 'defer': False, 'link_now': True, 'partner': 2, 'suffix': [3]}Failed
regression certificate 5{'carry_rank': 3, 'current': 1, 'defer': False, 'link_now': True, 'partner': 2, 'suffix': [4, 5]}{'carry_rank': 3, 'current': 2, 'defer': False, 'link_now': True, 'partner': 2, 'suffix': [4, 5]}Failed
regression certificate 6{'carry_rank': None, 'current': 0, 'defer': False, 'link_now': False, 'partner': None, 'suffix': [0, 1, 1, 2]}{'carry_rank': None, 'current': 0, 'defer': False, 'link_now': False, 'partner': None, 'suffix': [0, 1, 1, 2]}Passed
variant-dependent certificate{'carry_rank': None, 'current': 1, 'defer': False, 'link_now': False, 'partner': None, 'suffix': [1, 2, 2, 3]}{'carry_rank': None, 'current': 1, 'defer': False, 'link_now': False, 'partner': None, 'suffix': [1, 2, 2, 3]}Passed

SHA-256 / f33222a8c76b4c6f41805eb93f9d4e6c791617b98af1389e1f1dc02cb816de39

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(d):
    r=d['ranks']; i=d['i']; exists=i<len(r); pair=i+1<len(r) and r[i]==r[i+1]; triple=i+2<len(r) and r[i]==r[i+1]==r[i+2]
    link=pair and not triple
    return {'link_now': link,
    'current': i if exists else None,
    'carry_rank': r[i]+1 if link else None,
    'suffix': r[i+2:] if link else r[i:],
    'defer': triple,
    'partner': i+1 if link else None}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = [[({'ranks': [], 'i': 0}, {'link_now': False, 'current': None, 'carry_rank': None, 'suffix': [], 'defer': False, 'partner': None}), ({'ranks': [0, 0], 'i': 0}, {'link_now': True, 'current': 0, 'carry_rank': 1, 'suffix': [], 'defer': False, 'partner': 1}), ({'ranks': [0, 0, 0, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 0, 0, 2], 'defer': True, 'partner': None}), ({'ranks': [0, 1, 1, 3], 'i': 1}, {'link_now': True, 'current': 1, 'carry_rank': 2, 'suffix': [3], 'defer': False, 'partner': 2}), ({'ranks': [1, 2, 2, 4, 5], 'i': 1}, {'link_now': True, 'current': 2, 'carry_rank': 3, 'suffix': [4, 5], 'defer': False, 'partner': 2}), ({'ranks': [0, 1, 1, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 1, 1, 2], 'defer': False, 'partner': None}), ({'ranks': [1, 2, 2, 3], 'i': 0}, {'link_now': False, 'current': 1, 'carry_rank': None, 'suffix': [1, 2, 2, 3], 'defer': False, 'partner': None})], [({'ranks': [], 'i': 0}, {'link_now': False, 'current': None, 'carry_rank': None, 'suffix': [], 'defer': False, 'partner': None}), ({'ranks': [0, 0], 'i': 0}, {'link_now': True, 'current': 0, 'carry_rank': 1, 'suffix': [], 'defer': False, 'partner': 1}), ({'ranks': [0, 0, 0, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 0, 0, 2], 'defer': True, 'partner': None}), ({'ranks': [0, 1, 1, 3], 'i': 1}, {'link_now': True, 'current': 1, 'carry_rank': 2, 'suffix': [3], 'defer': False, 'partner': 2}), ({'ranks': [1, 2, 2, 4, 5], 'i': 1}, {'link_now': True, 'current': 2, 'carry_rank': 3, 'suffix': [4, 5], 'defer': False, 'partner': 2}), ({'ranks': [0, 1, 1, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 1, 1, 2], 'defer': False, 'partner': None}), ({'ranks': [2, 3, 3, 4], 'i': 0}, {'link_now': False, 'current': 2, 'carry_rank': None, 'suffix': [2, 3, 3, 4], 'defer': False, 'partner': None})], [({'ranks': [], 'i': 0}, {'link_now': False, 'current': None, 'carry_rank': None, 'suffix': [], 'defer': False, 'partner': None}), ({'ranks': [0, 0], 'i': 0}, {'link_now': True, 'current': 0, 'carry_rank': 1, 'suffix': [], 'defer': False, 'partner': 1}), ({'ranks': [0, 0, 0, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 0, 0, 2], 'defer': True, 'partner': None}), ({'ranks': [0, 1, 1, 3], 'i': 1}, {'link_now': True, 'current': 1, 'carry_rank': 2, 'suffix': [3], 'defer': False, 'partner': 2}), ({'ranks': [1, 2, 2, 4, 5], 'i': 1}, {'link_now': True, 'current': 2, 'carry_rank': 3, 'suffix': [4, 5], 'defer': False, 'partner': 2}), ({'ranks': [0, 1, 1, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 1, 1, 2], 'defer': False, 'partner': None}), ({'ranks': [3, 4, 4, 5], 'i': 0}, {'link_now': False, 'current': 3, 'carry_rank': None, 'suffix': [3, 4, 4, 5], 'defer': False, 'partner': None})], [({'ranks': [], 'i': 0}, {'link_now': False, 'current': None, 'carry_rank': None, 'suffix': [], 'defer': False, 'partner': None}), ({'ranks': [0, 0], 'i': 0}, {'link_now': True, 'current': 0, 'carry_rank': 1, 'suffix': [], 'defer': False, 'partner': 1}), ({'ranks': [0, 0, 0, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 0, 0, 2], 'defer': True, 'partner': None}), ({'ranks': [0, 1, 1, 3], 'i': 1}, {'link_now': True, 'current': 1, 'carry_rank': 2, 'suffix': [3], 'defer': False, 'partner': 2}), ({'ranks': [1, 2, 2, 4, 5], 'i': 1}, {'link_now': True, 'current': 2, 'carry_rank': 3, 'suffix': [4, 5], 'defer': False, 'partner': 2}), ({'ranks': [0, 1, 1, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 1, 1, 2], 'defer': False, 'partner': None}), ({'ranks': [4, 5, 5, 6], 'i': 0}, {'link_now': False, 'current': 4, 'carry_rank': None, 'suffix': [4, 5, 5, 6], 'defer': False, 'partner': None})], [({'ranks': [], 'i': 0}, {'link_now': False, 'current': None, 'carry_rank': None, 'suffix': [], 'defer': False, 'partner': None}), ({'ranks': [0, 0], 'i': 0}, {'link_now': True, 'current': 0, 'carry_rank': 1, 'suffix': [], 'defer': False, 'partner': 1}), ({'ranks': [0, 0, 0, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 0, 0, 2], 'defer': True, 'partner': None}), ({'ranks': [0, 1, 1, 3], 'i': 1}, {'link_now': True, 'current': 1, 'carry_rank': 2, 'suffix': [3], 'defer': False, 'partner': 2}), ({'ranks': [1, 2, 2, 4, 5], 'i': 1}, {'link_now': True, 'current': 2, 'carry_rank': 3, 'suffix': [4, 5], 'defer': False, 'partner': 2}), ({'ranks': [0, 1, 1, 2], 'i': 0}, {'link_now': False, 'current': 0, 'carry_rank': None, 'suffix': [0, 1, 1, 2], 'defer': False, 'partner': None}), ({'ranks': [5, 6, 6, 7], 'i': 0}, {'link_now': False, 'current': 5, 'carry_rank': None, 'suffix': [5, 6, 6, 7], 'defer': False, 'partner': None})]][N-1]
check('regression certificate 1', solve(cases[0][0]), cases[0][1])
check('regression certificate 2', solve(cases[1][0]), cases[1][1])
check('regression certificate 3', solve(cases[2][0]), cases[2][1])
check('regression certificate 4', solve(cases[3][0]), cases[3][1])
check('regression certificate 5', solve(cases[4][0]), cases[4][1])
check('regression certificate 6', solve(cases[5][0]), cases[5][1])
check('variant-dependent certificate', solve(cases[6][0]), cases[6][1])
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
regression certificate 1{'carry_rank': None, 'current': None, 'defer': False, 'link_now': False, 'partner': None, 'suffix': []}{'carry_rank': None, 'current': None, 'defer': False, 'link_now': False, 'partner': None, 'suffix': []}Passed
regression certificate 2{'carry_rank': 1, 'current': 0, 'defer': False, 'link_now': True, 'partner': 1, 'suffix': []}{'carry_rank': 1, 'current': 0, 'defer': False, 'link_now': True, 'partner': 1, 'suffix': []}Passed
regression certificate 3{'carry_rank': None, 'current': 0, 'defer': True, 'link_now': False, 'partner': None, 'suffix': [0, 0, 0, 2]}{'carry_rank': None, 'current': 0, 'defer': True, 'link_now': False, 'partner': None, 'suffix': [0, 0, 0, 2]}Passed
regression certificate 4{'carry_rank': 2, 'current': 1, 'defer': False, 'link_now': True, 'partner': 2, 'suffix': [3]}{'carry_rank': 2, 'current': 1, 'defer': False, 'link_now': True, 'partner': 2, 'suffix': [3]}Passed
regression certificate 5{'carry_rank': 3, 'current': 1, 'defer': False, 'link_now': True, 'partner': 2, 'suffix': [4, 5]}{'carry_rank': 3, 'current': 2, 'defer': False, 'link_now': True, 'partner': 2, 'suffix': [4, 5]}Failed
regression certificate 6{'carry_rank': None, 'current': 0, 'defer': False, 'link_now': False, 'partner': None, 'suffix': [0, 1, 1, 2]}{'carry_rank': None, 'current': 0, 'defer': False, 'link_now': False, 'partner': None, 'suffix': [0, 1, 1, 2]}Passed
variant-dependent certificate{'carry_rank': None, 'current': 0, 'defer': False, 'link_now': False, 'partner': None, 'suffix': [1, 2, 2, 3]}{'carry_rank': None, 'current': 1, 'defer': False, 'link_now': False, 'partner': None, 'suffix': [1, 2, 2, 3]}Failed

SHA-256 / 15f38640f2d0bc832a81627c81ac0833fa6ebb0b872936ee1f869a90a76f344f

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 7 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

A stipulated offline diagnostic model; it does not implement a production allocator, concurrency protocol, or complete heap library. 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 2026-09-29T14:43:27.285137+00:00.

Case digest / 33d78eef2bc8a92f0a107777f2330e8afa295c41a4d3961ead61d0047ecc7101