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How Our Rust-to-Zig Rewrite Is Going

For the past year and a half, the team building Roc's compiler has been rewriting our 300,000 lines of Rust code into Zig, for reasons I'll recap below. We recently passed an exciting milestone: feature parity with the original compiler! Since the Bun project recently shared an experience report of their rewrite in the other direction (from Zig to Rust, although that's only the tip of the iceberg of differences between our rewrites), this seems like a nice time to reflect on how our move from Rust to Zig is going.

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