Bun’s experimental Rust rewrite reaches 99.8% test compatibility on Linux x64 glibc, signaling progress beyond Zig

Bun’s experimental rewrite in Rust has reportedly reached 99.8% compatibility with its test suite on Linux x64 glibc. The update follows recent community discussion around porting from Zig to Rust and suggests the project is making substantial progress toward a viable alternative implementation.

High test compatibility indicates the rewrite may be moving from exploratory work toward practical validation, though platform coverage and production readiness remain open questions. If Bun continues shifting core work toward Rust, it could reflect a broader trend of developer-tooling projects prioritizing memory safety and ecosystem maturity over newer systems languages.