I think that type classes with nontrivial requirements should export QuickCheck properties that test those requirements. For example, the Data.Monoid module (http://haskell.org/ghc/docs/latest/html/libraries/base/Data-Monoid.html) could export properties that check the monoid laws (for an Arbitrary Monoid with Eq). That would serve as a formal specification of the requirements, and allow any user to check that their implementation is right.
-- I'm doing Science and I'm still alive. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
