* Rust: https://doc.rust-lang.org/std/result/ https://doc.rust-lang.org/std/result/ * Haskell: https://hackage.haskell.org/package/base-4.19.1.0/docs/Data-Eith

* Rust: https://doc.rust-lang.org/std/result/ https://doc.rust-lang.org/std/result/ * Haskell: https://hackage.haskell.org/package/base-4.19.1.0/docs/Data-Either.html https://hackage.haskell.org/package/base-4.19.1.0/docs/Data-... * C++: https://en.cppreference.com/w/cpp/utility/expected/value https://en.cppreference.com/w/cpp/utility/expected/value