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Multi-Stage Programming with Splice Variables
This is an interactive demonstration of the ICFP 2025 paper Multi-Stage Programming with Splice Variables by Tsung-Ju Chiang and Ningning Xie. What is multi-stage programming? It's a technique where programs generate other programs.
The let rec construct is naively implemented by substituting the definition, which may cause different behavior compared to OCaml when the right-hand side is not a lambda. Our type system automatically tracks both stage levels and variable dependencies, ensuring that all generated code is well-formed, properly scoped, and type-checks correctly. This kind of transformation would be error-prone to write manually, but our dependency tracking system handles all the variable scoping automatically, ensuring the result is always well-formed.
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