A Step toward Programming with Versions in Real-World Functional Languages

λVL is a core calculus based on the concept of programming with versions that supports multiple versions of program definitions and values inherently in the semantics of a language. However, since λVL was not designed as a surface language, its complex syntax and semantics only provide primitive constructs to manipulate versioned values. In order to realize the programming with versions concept in a real-world language, we propose a compilation method for functional languages through λVL and discuss how real-world programs can be written in a Haskell-like functional language with versions.