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This e-book constitutes the completely refereed post-proceedings of the twentieth foreign Workshop on Implementation and purposes of sensible Languages, IFL 2008, held in Hatfield, united kingdom, in September 2008. The 15 revised complete papers awarded have been conscientiously reviewed and chosen from 31 submissions. issues of curiosity disguise a variety from novel language designs, theoretical underpinnings, compilation and optimisation options for various architectures, to functions, programming recommendations and novel tools.
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Additional info for Implementation and Application of Functional Languages: 20th International Symposium, IFL 2008, Hatfield, UK, September 10-12, 2008. Revised Selected Papers
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Elements of the set of variables X are denoted by x, y, z, x1 , . . , xn and the set of values V is defined by V v ::= x | c(vn ) where x ∈ X and cn ∈ C. We consider X to be fixed in the following. Finally the set of expressions E is defined by E e ::= x | s(en ) where x ∈ X and sn ∈ Σ. A special class of terms is called linear. In a linear term every variable appears at most once. The sub terms of a term t are denoted by sub(t) and can be defined inductively by sub(x) = {x}; sub(s(en )) = {s(en )} ∪ 1≤i≤n sub(ei ).
A virtual machine for functional logic computations. , Trinder, P. ) IFL 2004. LNCS, vol. 3474, pp. 108–125. Springer, Heidelberg (2005) 6. : On generating unique names. Journal of Functional Programming 4(1), 117–123 (1994) 7. : The Kiel Curry system KiCS. , Wolf, A. ) INAP 2007. LNCS, vol. 5437, pp. 215–223. Springer, Heidelberg (2009) 8. : On a Tighter Integration of Functional and Logic Programming. In: Shao, Z. ) APLAS 2007. LNCS, vol. 4807, pp. 122–138. Springer, Heidelberg (2007) 9. : EasyCheck — test data for free.
From Functional Logic Programs to Purely Functional Programs 35 It is well known that any functional logic program can be transformed into an equivalent uniform program [1]. 2 and eventually adding auxiliary functions if the overlap is not trivial. 1 is redefined as: insert x xs = (x:xs) ? insert2 x xs insert2 x (y:ys) = y : insert x ys Complex pattern matching also requires the introduction of fresh operations. 1). 1 and justified in [4]. The simple structure of uniform programs allows us to concisely define our transformation in the following subsection.
