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{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
module T12387a where
import GHC.Generics
import Language.Haskell.TH.Lib
data Foo = Foo
$(do d <- instanceD (cxt []) (conT ''Eq `appT` conT ''Foo)
[tySynInstD $ tySynEqn Nothing (conT ''Rep `appT` conT ''Foo) (conT ''Maybe)]
return [d])
main :: IO ()
main = print $ Foo == Foo
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