Formal models and scripts: core-fst-package-examples-compile-and-print-documented-outputs

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

• The org.apache.lucene.util.fst package overview's code examples do not compile on any release since 9.0.0: they call Util.getByOutput (removed in 9.0.0), the public FSTCompiler(INPUT_TYPE, Outputs) constructor (removed in 9.9.0) and the Util.Result fields input/output (private record components since 10.0.0) (documentation defect) (finding LFV-1027; repro · finding page)

Files

• fst-package-overview-examples-call-removed-apis/model/check_verbatim.py (used for LFV-1027)
• fst-package-overview-examples-call-removed-apis/model/extract_blocks.py (used for LFV-1027)

How to run

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

Snapshot of 2026-11-04. AI-assisted; not yet triaged by a human Lucene committer. Feedback: open an issue in lucene-ai-bug-hunt.