> Right. I know there was some argument a while back, but I thought > that position that instances are global period was pretty "official". > At least it made sense to me. The more libraries you import the less > control you have over the extent of what they may import. But I guess > it wouldn't be haskell if every third person didn't have an idea for a > better way to implement the mtl... I just want an exception with a > message though!
A few days ago I was trying to refactor some code to use transformers + monads-tf instead of mtl. Eventually I gave up after getting error messages about Either having conflicting Monad instances. A few of the libraries I'm using depend on mtl. if I understand you correctly, all libraries that software I write depends on, directly or indirectly, must be free of namespace conflicts. Is that correct?
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