FA-3266 / Tokenization / Open access

A hash inside quotes begins a shell comment · case 01

A hash inside quotes begins a shell comment.

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: Tokenize POSIX words with unquoted hash comments enabled.

VERIFIED REPAIR

Implement the complete stated contract, including the boundary fixtures: Tokenize POSIX words with unquoted hash comments enabled.

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

Case contract

Tokenize POSIX words with unquoted hash comments enabled.

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 shlex.split(x.split('#')[0])
    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'])
check('boundary 2', solve('a # b'), ['a'])
check('boundary 3', solve("'#'"), ['#'])
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	`{'error': 'ValueError'}`	`['a', '#b']`	Failed
boundary 2	`['a']`	`['a']`	Passed
boundary 3	`{'error': 'ValueError'}`	`['#']`	Failed
boundary 4	`['x']`	`['x']`	Passed

SHA-256 / 24e7756eee3bfa407ac5b25720c1a613fd74212bac188da2902c207eaa69c6d3

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 shlex.split(x,comments=False)
    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'])
check('boundary 2', solve('a # b'), ['a'])
check('boundary 3', solve("'#'"), ['#'])
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']`	Failed
boundary 2	`['a', '#', 'b']`	`['a']`	Failed
boundary 3	`['#']`	`['#']`	Passed
boundary 4	`['x']`	`['x']`	Passed

SHA-256 / 991a55ffe60be8df17c575fc60f40c6df23feff64f2c0db71f95546b80f690bd

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 shlex.split(x,comments=True)
    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'])
check('boundary 2', solve('a # b'), ['a'])
check('boundary 3', solve("'#'"), ['#'])
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']`	`['a', '#b']`	Passed
boundary 2	`['a']`	`['a']`	Passed
boundary 3	`['#']`	`['#']`	Passed
boundary 4	`['x']`	`['x']`	Passed

SHA-256 / bc7214c100c7fc2d263a4a74407148c9518c6165a9c91130dcaee764b69b28b0

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 2026-09-29T14:37:23.516024+00:00.

Case digest / b03d3311a3f5b0cd9df1d59337768eecb685a7f317daa0b0ddb9beee3446e82a