Dear GHC experts, say I have module A where class C a where ... f :: C a => String -> a module B where import A data T = ... instance C T where ... g :: String -> SomeOtherType g s = doSomethingWith (f s) Is it possible to SPECIALIZE `f` for the type `T`? If I put the pragma {-# SPECIALIZE f :: String -> T #-} in module A, GHC complains that `T` is not in scope. If I put it in module B GHC complains that there is no accompanying binding for `f`. In my case, I don't want to put everything in a single module because I cannot know what other B-like modules people will implement. Are they bound to use `f` unspecialized for their types? Why? Cheers, Sebastian -- Underestimating the novelty of the future is a time-honored tradition. (D.G.)