Bun's Zig-to-Rust Rewrite Merged: 1M+ Lines of AI-Generated Rust, 13,000 Unsafe Blocks

The Register·high signal

PR #30412 by Jarred Sumner merged into Bun's main branch on May 14, adding 1,009,257 lines of Rust generated by Claude AI agents in a four-phase process: agents received the full Zig codebase, generated Rust in parallel, fed compiler errors through iterative correction loops, and verified against the existing test suite. The rewrite passes all platform tests, fixes memory leaks, and shrinks binary size 3-8MB, but 13,000+ unsafe blocks have sparked debate in the Rust community about code quality.