Developer Ports C Math Library TinyExpr to Rust, Tackles Behavioral Equivalence at Hackathon

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At the Code Resurrection 2026 hackathon, a developer ported TinyExpr — a lightweight C-based mathematical expression parser — into a safe, idiomatic Rust implementation called tinyexpr-rs. Rather than a line-by-line translation, the project aimed for a behavior-preserving reimplementation using Rust's ownership model and a clean lexer-parser-AST-evaluator pipeline. The developer built a smoke-test suite mirroring TinyExpr's original tests, ultimately achieving 30 unit tests and 13 smoke tests passing, with 2 intentionally skipped for unsupported features. A key challenge emerged around floating-point precision, where Rust's full f64 output differed from the original C library's rounded values, raising questions about what behavioral equivalence truly means. The project concluded that compatibility does not always require byte-for-byte matching, but rather preserving semantics within the numerical model of the target language.

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