João Barbosa, Mário Florido and Vítor Santos Costa: Sound Type Assignment for Logic Programs

Type systems are a powerful tool in modern programming languages. We argue that, to be successfully adopted by the logic programming community, the first step is to design a type system that is able to catch obvious and relevant errors at compile-time. To do so, we defined a new type system which describes polymorphic well-typings for logic programs while respecting the main properties that make types useful and semantically sound. We now tackle the question of automatically producing a well typing for a logic program. We concentrated first on the implementation of a new type inference algorithm and its application to several logic programs.

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