Codex Builds Hawk Tool To Detect Dead Rust Code Across Cargo Workspaces
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rustc can identify unused code within a crate, but (sensibly) assumes that anything `pub` might be used by external callers...
In uv, we are (with a few exceptions) our only caller, so we can analyze the workspace as a closed world. In other words, `pub` code that's unused across the workspace can be considered dead code. Hawk can identify and remove that code.
Similarly, code that's marked as `pub` but isn't used by any other crates can have its visibility downgraded. Same for struct fields, etc. (Hawk can enforce and fix this too.)
Building this was in part an experiment. I haven't "read" any of the code in this codebase, and yet it is empirically a really useful thing. We now run it continuously in uv's CI.
@GrantSlatton If it works well, I wrote it. If not, GPT wrote it.