The Pulse: What can we learn from Bun’s rapid Rust rewrite with AI?
Bun creator Jarred Sumner is rewriting the 535K-line Zig codebase into Rust, driven by persistent memory bugs (use-after-free, double-free) that safe Rust eliminates at compile time. The migration is accelerated by the AI tool Fable, which was temporarily blocked by US export controls but is now globally available, challenging the traditional dogma that full rewrites are always a terrible idea.