FA-9916 / Packaging / Open access

Entry point registry assembly: Conflicting entry points silently replace earlier ones · case 01

Conflicting entry points silently replace earlier ones.

Verified by executionVariant 1 · 6 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The implementation substitutes if False: return 'conflict' for if name in bucket and bucket[name] != target: return 'conflict', so conflicting entry points silently replace earlier ones.

VERIFIED REPAIR

Reject same-group names mapped to different targets.

Unsuccessful approach: The attempted repair substitutes if name in bucket and bucket[name] == target: return 'conflict'. Fixture 4 still yields {'cli': {'run': 'b:main'}} instead of 'conflict'.

Case contract

Build a group-to-name-to-target mapping, skip disabled declarations, reject conflicting duplicate names within a group, allow duplicates with the same target, and allow identical names across groups.

Why this case matters

An offline model of entry point registry assembly, suitable for testing build and release tooling without external services.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(rows):
    result = {}
    for group, name, target, enabled in rows:
        if not enabled: continue
        bucket = result.setdefault(group, {})
        if False: return 'conflict'
        bucket[name] = target
    return result
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve([]), {})
check('fixture 2', solve([('cli', 'run', 'a:main', True)]), {'cli': {'run': 'a:main'}})
check('fixture 3', solve([('cli', 'run', 'a:main', False)]), {})
check('fixture 4', solve([('cli', 'run', 'a:main', True), ('cli', 'run', 'b:main', True)]), 'conflict')
check('fixture 5', solve([('cli', 'run', 'a:main', True), ('cli', 'run', 'a:main', True)]), {'cli': {'run': 'a:main'}})
check('fixture 6', solve([('cli', 'run', 'a:main', True), ('plugin', 'run', 'b:main', True)]), {'cli': {'run': 'a:main'}, 'plugin': {'run': 'b:main'}})
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
fixture 1	`{}`	`{}`	Passed
fixture 2	`{'cli': {'run': 'a:main'}}`	`{'cli': {'run': 'a:main'}}`	Passed
fixture 3	`{}`	`{}`	Passed
fixture 4	`{'cli': {'run': 'b:main'}}`	`conflict`	Failed
fixture 5	`{'cli': {'run': 'a:main'}}`	`{'cli': {'run': 'a:main'}}`	Passed
fixture 6	`{'cli': {'run': 'a:main'}, 'plugin': {'run': 'b:main'}}`	`{'cli': {'run': 'a:main'}, 'plugin': {'run': 'b:main'}}`	Passed

SHA-256 / faf31c17eb48c7434a04ffd3e38b9628188bff2fd7e3d31a5481c30d80473542

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(rows):
    result = {}
    for group, name, target, enabled in rows:
        if not enabled: continue
        bucket = result.setdefault(group, {})
        if name in bucket and bucket[name] == target: return 'conflict'
        bucket[name] = target
    return result
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve([]), {})
check('fixture 2', solve([('cli', 'run', 'a:main', True)]), {'cli': {'run': 'a:main'}})
check('fixture 3', solve([('cli', 'run', 'a:main', False)]), {})
check('fixture 4', solve([('cli', 'run', 'a:main', True), ('cli', 'run', 'b:main', True)]), 'conflict')
check('fixture 5', solve([('cli', 'run', 'a:main', True), ('cli', 'run', 'a:main', True)]), {'cli': {'run': 'a:main'}})
check('fixture 6', solve([('cli', 'run', 'a:main', True), ('plugin', 'run', 'b:main', True)]), {'cli': {'run': 'a:main'}, 'plugin': {'run': 'b:main'}})
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
fixture 1	`{}`	`{}`	Passed
fixture 2	`{'cli': {'run': 'a:main'}}`	`{'cli': {'run': 'a:main'}}`	Passed
fixture 3	`{}`	`{}`	Passed
fixture 4	`{'cli': {'run': 'b:main'}}`	`conflict`	Failed
fixture 5	`conflict`	`{'cli': {'run': 'a:main'}}`	Failed
fixture 6	`{'cli': {'run': 'a:main'}, 'plugin': {'run': 'b:main'}}`	`{'cli': {'run': 'a:main'}, 'plugin': {'run': 'b:main'}}`	Passed

SHA-256 / d96f7d9806b99affb00df7fa2d73ef3ee574aadbef167c66e2cb611220f32469

3 / The verified repair

Exit 0

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

N = 1
observations = []
def solve(rows):
    result = {}
    for group, name, target, enabled in rows:
        if not enabled: continue
        bucket = result.setdefault(group, {})
        if name in bucket and bucket[name] != target: return 'conflict'
        bucket[name] = target
    return result
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve([]), {})
check('fixture 2', solve([('cli', 'run', 'a:main', True)]), {'cli': {'run': 'a:main'}})
check('fixture 3', solve([('cli', 'run', 'a:main', False)]), {})
check('fixture 4', solve([('cli', 'run', 'a:main', True), ('cli', 'run', 'b:main', True)]), 'conflict')
check('fixture 5', solve([('cli', 'run', 'a:main', True), ('cli', 'run', 'a:main', True)]), {'cli': {'run': 'a:main'}})
check('fixture 6', solve([('cli', 'run', 'a:main', True), ('plugin', 'run', 'b:main', True)]), {'cli': {'run': 'a:main'}, 'plugin': {'run': 'b:main'}})
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
fixture 1	`{}`	`{}`	Passed
fixture 2	`{'cli': {'run': 'a:main'}}`	`{'cli': {'run': 'a:main'}}`	Passed
fixture 3	`{}`	`{}`	Passed
fixture 4	`conflict`	`conflict`	Passed
fixture 5	`{'cli': {'run': 'a:main'}}`	`{'cli': {'run': 'a:main'}}`	Passed
fixture 6	`{'cli': {'run': 'a:main'}, 'plugin': {'run': 'b:main'}}`	`{'cli': {'run': 'a:main'}, 'plugin': {'run': 'b:main'}}`	Passed

SHA-256 / 2f547ee8def0920638766f1644428a8134da4a1c363fa799b33758655e68942e

Verification & scope

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 2026-09-29T14:38:34.171285+00:00.

Case digest / 9c56af33ab970059692d0aee3a688937448d0e8c09ac5e234c22fe6e601db889