Performance fixture: real-world Rust file pair from tauri-apps/tauri (examples/api/src-tauri/build.rs, commit a16796a55592cf5be80043edfbb630dd2e32efab) that takes diff_code roughly 650ms despite a combined AST size of only 907 nodes. Captured via research/diff_pairs_benchmark_rust.csv; useful for regression-testing and profiling diff_code's worst-case behavior on small/medium real-world inputs.
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