testsuite/tests/th/TH_tf3.hs


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{-# LANGUAGE TypeFamilies, FlexibleInstances, UndecidableInstances #-}

module TH_tf3 where

type family T a

$( [d| foo :: T [a] ~ Bool => a -> a
       foo x = x |] )

$( [d| class C a 
       instance a ~ Int => C a |] )