FA-2991 / Text processing / Open access

A qualified label splits at its first colon · case 01

A qualified label splits at its first colon.

Verified by executionVariant 1 · 4 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The implementation applies an operation whose text or grammar semantics violate this contract: Split on the final colon; if missing return empty qualifier and whole label.

VERIFIED REPAIR

Implement the complete stated contract, including the boundary fixtures: Split on the final colon; if missing return empty qualifier and whole label.

Unsuccessful approach: The attempted repair handles the primary example but still violates a separate boundary of the same contract.

Case contract

Split on the final colon; if missing return empty qualifier and whole label.

Why this case matters

A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return [x.partition(':')[0],x.partition(':')[2]]
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('a:b:c'), ['a:b', 'c'])
check('boundary 2', solve('name'), ['', 'name'])
check('boundary 3', solve(':x'), ['', 'x'])
check('boundary 4', solve('x:'), ['x', ''])
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
boundary 1	`['a', 'b:c']`	`['a:b', 'c']`	Failed
boundary 2	`['name', '']`	`['', 'name']`	Failed
boundary 3	`['', 'x']`	`['', 'x']`	Passed
boundary 4	`['x', '']`	`['x', '']`	Passed

SHA-256 / 3ac2a80d426bb8f5f610c572ba0b37f4a7e128b164a6e0c290eddf0249570a67

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return x.rsplit(':',1) if ':' in x else [x,'']
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('a:b:c'), ['a:b', 'c'])
check('boundary 2', solve('name'), ['', 'name'])
check('boundary 3', solve(':x'), ['', 'x'])
check('boundary 4', solve('x:'), ['x', ''])
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
boundary 1	`['a:b', 'c']`	`['a:b', 'c']`	Passed
boundary 2	`['name', '']`	`['', 'name']`	Failed
boundary 3	`['', 'x']`	`['', 'x']`	Passed
boundary 4	`['x', '']`	`['x', '']`	Passed

SHA-256 / f129c027d804350a0583172073a7e04bd9e86addd6c59411b2ea1cf85b7eb22c

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return [x.rpartition(':')[0],x.rpartition(':')[2]]
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('a:b:c'), ['a:b', 'c'])
check('boundary 2', solve('name'), ['', 'name'])
check('boundary 3', solve(':x'), ['', 'x'])
check('boundary 4', solve('x:'), ['x', ''])
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
boundary 1	`['a:b', 'c']`	`['a:b', 'c']`	Passed
boundary 2	`['', 'name']`	`['', 'name']`	Passed
boundary 3	`['', 'x']`	`['', 'x']`	Passed
boundary 4	`['x', '']`	`['x', '']`	Passed

SHA-256 / c558eebec0051505ab086b993cf4071737ab2df5116a8b056a45140f935255b0

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 2026-09-29T14:37:19.908123+00:00.

Case digest / 9cf6fb1cbfdb3d663b8a9d5a570ef856ffeaa66490c06cc7f0a0b155e6230f70