FA-3886 / Tokenization / Open access

Tokenization drops punctuation needed by the parser · case 01

Tokenization drops punctuation needed by the parser.

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 into ASCII word runs or individual nonspace punctuation tokens.

VERIFIED REPAIR

Implement the complete stated contract, including the boundary fixtures: Split into ASCII word runs or individual nonspace punctuation tokens.

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

Case contract

Split into ASCII word runs or individual nonspace punctuation tokens.

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 re.findall(r'\w+',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'), ['a', '+', 'b'])
check('boundary 2', solve('a<=b'), ['a', '<', '=', 'b'])
check('boundary 3', solve('abc'), ['abc'])
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']`	Failed
boundary 2	`['a', 'b']`	`['a', '<', '=', 'b']`	Failed
boundary 3	`['abc']`	`['abc']`	Passed
boundary 4	`[]`	`[]`	Passed

SHA-256 / ebd41e43dfbc3973d071646458524337baf9ab1090fcb8ef7f76e11a9207f653

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.findall(r'[A-Za-z]+|[^\w\s]+',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'), ['a', '+', 'b'])
check('boundary 2', solve('a<=b'), ['a', '<', '=', 'b'])
check('boundary 3', solve('abc'), ['abc'])
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']`	Failed
boundary 3	`['abc']`	`['abc']`	Passed
boundary 4	`[]`	`[]`	Passed

SHA-256 / 3dacd0ae8722fdae038f6ce0354d08019938ebc0ef751538647336bc3bc4d72e

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.findall(r'[A-Za-z]+|[^A-Za-z\s]',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'), ['a', '+', 'b'])
check('boundary 2', solve('a<=b'), ['a', '<', '=', 'b'])
check('boundary 3', solve('abc'), ['abc'])
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	`['abc']`	`['abc']`	Passed
boundary 4	`[]`	`[]`	Passed

SHA-256 / 61e469912b7f7289cc2e253e2e0d3d5eb629816c73316c60f02c948f0451b644

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 2026-09-29T14:37:32.364777+00:00.

Case digest / 153d54a2a7c1696e6acb9931b54bf5687bcbcfaa38cdac48759cadb10455b443