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Designing Walrus: Relational Programming with Rich Types, On-Demand Laziness, and Structured Traces
October 02, 2025 Β· Declared Dead Β· π arXiv.org
"No code URL or promise found in abstract"
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Authors
Santiago CuΓ©llar, Naomi Spargo, Jonathan Daugherty, David Darais
arXiv ID
2510.02579
Category
cs.PL: Programming Languages
Citations
1
Venue
arXiv.org
Last Checked
4 months ago
Abstract
We present Walrus, a functional relational programming language embedded in Haskell that extends the miniKanren model with type-polymorphic unification, on-demand laziness, and a range of usability features aimed at practical development. These include use of Haskell Generics for boilerplate reduction, structured debugging traces, and ergonomic support for product types. We describe the design and implementation of Walrus through the lens of our experience developing bidirectional compilers, and reflect on key design decisions and recurring usability challenges encountered in practice.
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