Bun Has Been Converted to Rust. Now What?

▤ Summary

The article examines Bun’s Rust rewrite and questions whether the change actually delivers the safety benefits that motivated it. It highlights that Claude Code agents generated most of the code and that the new codebase still contains more than 10,000 unsafe blocks. The piece argues that a green test suite only proves behavioral equivalence, not memory safety. It also warns that auditing this volume of agent-generated code is a multi-year verification problem, not a simple cleanup task. The broader takeaway is that code generation has scaled much faster than reliable verification.

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