Tmux ported from C to Rust by manual translation. Collin Richards spent six months rewriting the entire ~67,000 lines of tmux code from C into Rust, achieving 100% Rust (though still unsafe) code. He initially used C2Rust transpilation but found its output verbose and unmaintainable, leading to hand-porting each function to idiomatic Rust.\nIntegration with the legacy autotools build system involved careful static linking and FFI management. Challenges included translating C constructs like `goto` into Rust’s labeled loops, and working around classic foreign function interface bugs such as missing prototypes and struct layout mismatches.\nData structures, including intrusively linked red-black trees, were reimplemented with Rust traits and generics. The yacc-based config parser was replaced with the Rust parser generator lalrpop...

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