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{-# LANGUAGE TemplateHaskell, KindSignatures, FlexibleInstances #-}
module T5452 where
import Language.Haskell.TH
class C (f :: * -> *)
class D (f :: * -> *)
instance C ((,) Int)
$(do { ClassI _ [inst_dec] <- reify ''C
; let InstanceD o cxt (AppT _ ty) _ = inst_dec
; return [InstanceD o cxt
(foldl AppT (ConT ''D) [ty])
[]
] })
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