| You are an agent, your current working directory is /app. |
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| You can use the tools available to you to interact with the computer to assist the user in completing tasks. |
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| # Repair independent LALR interactive-parser clones |
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| The frozen Lark tree in `/app/vendor/lark` has a clone-ownership regression. Copying an `InteractiveParser` after partially consuming a source stream creates multiple lexer objects whose references do not agree. A clone may therefore consume the original parser's remaining input, or a superficially independent implementation may leave `parser_state.lexer` disconnected from `lexer_thread`. |
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| Repair the existing implementation in both files: |
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| - `/app/vendor/lark/lark/parsers/lalr_parser_state.py` |
| - `/app/vendor/lark/lark/parsers/lalr_interactive_parser.py` |
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| ## Required behavior |
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| 1. `ParserState.copy(deepcopy_values=...)` must create an independent lexer thread and independent parser stack while preserving its current shallow-versus-deep value-stack policy. |
| 2. `InteractiveParser.copy(deepcopy_values=...)` must use one coherent cloned lexer thread: the clone's `parser_state.lexer` must be the clone's `lexer_thread`, and neither may be the original parser's lexer thread. |
| 3. After partially consuming input, clone and original must both be resumable to the same complete parse tree in either execution order. Advancing either continuation must not change the other's cursor. |
| 4. Existing manual `feed_token`, `exhaust_lexer`, EOF, and ordinary LALR parsing behavior must remain compatible. |
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| Do not replace the parser with a task-specific implementation, hard-code the sample streams, disable tests, or edit the supplied upstream test asset. |
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| ## Validation and artifact |
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| From `/app/vendor/lark`, run: |
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| ```bash |
| python3 -m compileall -q lark |
| python3 tests/test_parser.py TestLalrBasic.test_parser_interactive_parser -q |
| ``` |
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| Then generate the required artifact: |
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| ```bash |
| cd /app |
| python3 tools/run_clone_matrix.py --output /app/repair_report.json |
| ``` |
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| The artifact must use `output_schema_version` **`lark-clone-repair-v1`** and the driver must report `summary.all_cases_pass: true` after the source repair. |
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