Formal models and scripts: hunspell-wordform-generator-munch-differential

Tools: Python

These are the working models and scripts this part of the hunt used. Some encode the code as it is (a counterexample is the expected result), others a fixed or correct variant; read the header comment of each file. Paths inside them were replaced by placeholders such as $LUCENE (a Lucene checkout) and $WORK.

Findings

• Hunspell rejects, cannot stem and does not generate twofold-suffix words (a second suffix allowed by the first suffix's continuation class) when either suffix class has cross product N, although cross product only governs prefix+suffix combinations: with 'SFX S 0 st/E', 'SFX E N 2' (en, e) and raich/SE, spell("raichsten") is false; the real Luxembourgish dictionary rejects räichsten (finding LFV-641; repro · finding page)
• Hunspell getAllWordForms, generateAllSimpleWords and compress never generate a suffix that only a prefix's continuation class allows: with ampere/U and 'PFX U 0 kilo/S', spell() accepts amperes and kiloamperes, but getAllWordForms("ampere") returns only [ampere, kiloampere] (finding LFV-634; repro · finding page)

Files

• harness/compare.py (used for LFV-634)
• harness/gen_micro.py (used for LFV-634)
• model/survey/aff_survey.py (used for LFV-641)

How to run

• Python: python3 <file>.py; scripts that import z3 need the z3-solver package.

Snapshot of 2026-11-03. AI-assisted; not yet triaged by a human Lucene committer. Feedback: open an issue in lucene-ai-bug-hunt.