Staging with class: A specification for typed template Haskell
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jats:pMulti-stage programming using typed code quotation is an established technique for writing optimizing code generators with strong type-safety guarantees. Unfortunately, quotation in Haskell interacts poorly with type classes, making it difficult to write robust multi-stage programs.</jats:p> jats:p We study this unsound interaction and propose a resolution, staged type class constraints, which we formalize in a source calculus λ jats:sup⇒</jats:sup> that elaborates into an explicit core calculus jats:italicF</jats:italic> . We show type soundness of both calculi, establishing that well-typed, well-staged source programs always elaborate to well-typed, well-staged core programs, and prove beta and eta rules for code quotations. </jats:p> jats:pOur design allows programmers to incorporate type classes into multi-stage programs with confidence. Although motivated by Haskell, it is also suitable as a foundation for other languages that support both overloading and quotation.</jats:p>
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2475-1421