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## Summary `cargo test` has entails both running standard Rust tests and doctests. It turns out that the doctest discovery is fairly slow, and it's a cost you pay even for crates that don't include any doctests. This PR disables doctests with `doctest = false` for crates that lack any doctests. For the collection of crates below, this speeds up test execution by >4x. E.g., before this PR: ``` Benchmark 1: cargo test -p codex-utils-absolute-path -p codex-utils-cache -p codex-utils-cli -p codex-utils-home-dir -p codex-utils-output-truncation -p codex-utils-path -p codex-utils-string -p codex-utils-template -p codex-utils-elapsed -p codex-utils-json-to-toml Time (mean ± σ): 1.849 s ± 4.455 s [User: 0.752 s, System: 1.367 s] Range (min … max): 0.418 s … 14.529 s 10 runs ``` And after: ``` Benchmark 1: cargo test -p codex-utils-absolute-path -p codex-utils-cache -p codex-utils-cli -p codex-utils-home-dir -p codex-utils-output-truncation -p codex-utils-path -p codex-utils-string -p codex-utils-template -p codex-utils-elapsed -p codex-utils-json-to-toml Time (mean ± σ): 428.6 ms ± 6.9 ms [User: 187.7 ms, System: 219.7 ms] Range (min … max): 418.0 ms … 436.8 ms 10 runs ``` For a single crate, with >2x speedup, before: ``` Benchmark 1: cargo test -p codex-utils-string Time (mean ± σ): 491.1 ms ± 9.0 ms [User: 229.8 ms, System: 234.9 ms] Range (min … max): 480.9 ms … 512.0 ms 10 runs ``` And after: ``` Benchmark 1: cargo test -p codex-utils-string Time (mean ± σ): 213.9 ms ± 4.3 ms [User: 112.8 ms, System: 84.0 ms] Range (min … max): 206.8 ms … 221.0 ms 13 runs ``` Co-authored-by: Codex <noreply@openai.com>