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Google Rewrites Critical C Dependencies to Rust Using AI and Differential Fuzzing
Google successfully used Gemini AI and differential fuzzing to rewrite giflib, a critical C dependency, into memory-safe Rust. This process created an ABI-compatible drop-in replacement, preempted a zero-day vulnerability, and improved p99 tail latency by enabling the removal of process isolation sandboxes.
Migrating the GitHub Copilot runtime to Rust, using Copilot
The Copilot agent runtime was rewritten from a 130‑k‑line TypeScript/Node.js codebase into a native Rust library (~830 k lines of Rust) to reduce startup latency, memory use, and improve reliability. The migration was done incrementally (in‑place) across 128 PRs, with AI‑generated code handling most of the work. The new runtime exposes a C ABI for in‑process embedding by all six Copilot SDK langu…
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