GitHub - pen-lang/pen: The parallel, concurrent, and functional programming language for scalable software development

Pen is the parallel, concurrent, and functional programming language focused on application programming following Go's philosophy. It aims for further simplicity, testability, and portability to empower team (v. individual) and/or long-term (v. short-term) productivity. Its syntax, type system, effect system, and module system are fashioned to achieve those goals being simple and easy to grasp for

[mattn]

Rust で書かれたプログラミング言語。ドキュメントがしっかりしてる。