A b s t r a c t The increasing popularity of component-based programming tools offer a big opportunity to designers of advanced programming languages, such as Haskell. If we can package our programs as software components, then it is easy to integrate them into applications written in other languages. Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial

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... advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. ICFP '99 9•99 Paris, France © 1999 ACM 1-58113-111-919910009_. $ 5.00