testsuite/tests/ghc-regress/indexed-types/should_compile/OversatDecomp.hs


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{-# LANGUAGE TypeFamilies, MultiParamTypeClasses #-}

module OversatDecomp where

class Blah f a where
  blah :: a -> T f f a

class A f where
  type T f :: (* -> *) -> * -> *

wrapper :: Blah f a => a -> T f f a
wrapper x = blah x