FA-3796 / Text processing / Open access

Paragraph splitting counts each blank line separately · case 01

Paragraph splitting counts each blank line separately.

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 LF text at one or more whitespace-only blank lines; trim LF at ends and preserve line content.

VERIFIED REPAIR

Implement the complete stated contract, including the boundary fixtures: Split LF text at one or more whitespace-only blank lines; trim LF at ends and preserve line content.

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

Case contract

Split LF text at one or more whitespace-only blank lines; trim LF at ends and preserve line content.

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.split('\n\n')
    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\n \nb'), ['a', 'b'])
check('boundary 2', solve('a\n\n\nb'), ['a', 'b'])
check('boundary 3', solve('a\nb'), ['a\nb'])
check('boundary 4', solve(''), [])
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\n \nb']`	`['a', 'b']`	Failed
boundary 2	`['a', '\nb']`	`['a', 'b']`	Failed
boundary 3	`['a\nb']`	`['a\nb']`	Passed
boundary 4	`['']`	`[]`	Failed

SHA-256 / 1a664cf807ead154bc29146a0f03a897b5ee949692d00da8ba4307d9346c6a3e

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 re.split(r'\n\n+',x.strip('\n')) if x.strip('\n') else []
    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\n \nb'), ['a', 'b'])
check('boundary 2', solve('a\n\n\nb'), ['a', 'b'])
check('boundary 3', solve('a\nb'), ['a\nb'])
check('boundary 4', solve(''), [])
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\n \nb']`	`['a', 'b']`	Failed
boundary 2	`['a', 'b']`	`['a', 'b']`	Passed
boundary 3	`['a\nb']`	`['a\nb']`	Passed
boundary 4	`[]`	`[]`	Passed

SHA-256 / 7402ff21c7decf92085b6f76c9a28e84c4adc3b21d40c34e348d599161a758c0

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 re.split(r'\n[ \x09]*\n(?:[ \x09]*\n)*',x.strip('\n')) if x.strip('\n') else []
    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\n \nb'), ['a', 'b'])
check('boundary 2', solve('a\n\n\nb'), ['a', 'b'])
check('boundary 3', solve('a\nb'), ['a\nb'])
check('boundary 4', solve(''), [])
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']`	`['a', 'b']`	Passed
boundary 2	`['a', 'b']`	`['a', 'b']`	Passed
boundary 3	`['a\nb']`	`['a\nb']`	Passed
boundary 4	`[]`	`[]`	Passed

SHA-256 / d5f96f92792102a419350ace21c0634f332f93fdc25214a472b56b7598eb9951

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 2026-09-29T14:37:31.156083+00:00.

Case digest / 8a981beb964b56bd10dae17c28739832e75879cb38956189873d1fc71475d15a