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{-# LANGUAGE TemplateHaskell #-}
module SafeLang11_B ( Class(..), mkSimpleClass ) where
import Language.Haskell.TH
class Class a where
c :: a
mkSimpleClass :: Name -> Q [Dec]
mkSimpleClass name = do
TyConI (DataD [] dname [] Nothing cs _) <- reify name
((NormalC conname []):_) <- return cs
ClassI (ClassD [] cname [_] [] [SigD mname _]) _ <- reify ''Class
return [InstanceD Nothing Nothing [] (AppT (ConT cname) (ConT dname)) [FunD mname
[Clause [] (NormalB (ConE conname)) []]]]
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