Excerpts from Evan Laforge's message of Mon Sep 06 13:30:43 -0400 2010: > I feel like the circular imports problem is worse in haskell than > other languages. Maybe because there is a tendency to centralize all > state, since you need to define it along with your state monad. But > the state monad module must be one of the lower level ones, since all > modules that use it must import it. However, the tendency for bits of > typed data to migrate into the state means it's easy for it to > eventually want to import one of its importers. And the state monad > module gets larger and larger (the largest modules in my system are > those that define state monads: 1186 lines, 706 lines, 1156 > lines---the rest tend to be 100--300 lines).
I have used hs-boot files to this effect. I separated data and functionality, and typeclasses, which must be in the same module as data or are considered orphaned, get definitions via a circular import. Edward _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
