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Simplifying a Haskell Backend with GADTs: A Tale of Two Lambda Box Targets

2025-01-24

This blog post details how the author used Generalized Algebraic Datatypes (GADTs) in Haskell to simplify the development of an Agda compiler backend. Facing the challenge of compiling to two different Lambda Box intermediate language targets (typed and untyped), the author leveraged GADTs and dependent types to elegantly avoid code duplication and enforce type safety. The type system prevents the omission of type information for the typed target. This practical example demonstrates the power of GADTs in everyday programming and showcases how dependent types can help prevent errors, resulting in cleaner, more maintainable code.

Overloading Lambda Abstraction in Haskell: An Elegant Approach to EDSL Design

2024-12-30

This article presents a novel method for overloading lambda abstraction in Haskell to build embedded domain-specific languages (EDSLs). By cleverly using a `Port` type and `encode`/`decode` functions, the author elegantly translates Haskell functions into morphisms within a custom category. This results in a concise and intuitive syntax, avoiding the complexities of Arrow abstractions and the proc notation. The approach requires minimal Haskell code and no metaprogramming or compiler plugins. A flow diagram DSL example demonstrates the method's application, along with discussions on preventing duplication and handling side effects.