Abstract. We present a high-level transformation scheme to translate lazy functional logic programs into pure Haskell programs. This transformation is based on a recent proposal to efficiently implement lazy non-deterministic computations in Haskell into monadic style. We build on this work and define a systematic method to transform lazy functional logic programs into monadic programs with explicit sharing. This results in a transformation scheme which produces high-level and flexible target code. For instance, the target code is parametric w.r.t. the concrete evaluation monad. Thus, different monad instances could, for example, define different search strategies (e.g., depth-first, breadth-first, parallel). We formally describe the basic compilation scheme and some useful extensions. 1

Abstract. With the aim of putting type-based reasoning for functional logic languages, as recently explored by Christiansen et al. (2010), on a formal basis, we develop a denotational semantics for a typed core language of Curry. Dealing with the core language FlatCurry rather than with full Curry suffices, since there exists a type-preserving translation from the latter into the former. In contrast to existing semantics for functional logic languages, we deliberately approach the problem “from the functional side”. That is, rather than adapting approaches previously known from the study of (resolution-like) semantics for logic languages, we aim for a semantics in the spirit of standard denotational semantics for the polymorphic lambda calculus. We claim and set out to prove that the presented semantics is adequate with respect to an existing operational semantics. A particularly interesting aspect, we think, is that we give the first denotational treatment of recursive let-bindings in combination with call-time choice. 1

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