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{-# LANGUAGE Haskell2010 #-}
{-# LANGUAGE FlexibleContexts, FlexibleInstances, AllowAmbiguousTypes #-}
{-# LANGUAGE UndecidableSuperClasses #-}
module T16414 where
data I = I
class All2 x => All x
class All x => All2 x
class AllZip2 f
instance AllZip2 f
f1 :: (All x, AllZip2 I) => x -> ()
f1 = f2
f2 :: AllZip2 f => x -> ()
f2 _ = ()
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