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{-# OPTIONS_GHC -fwarn-incomplete-patterns -fwarn-overlapping-patterns #-}
{-# LANGUAGE GADTs, TypeFamilies #-}
module T3927a where
type family F a
type instance F a = ()
data Foo a where
FooA :: Foo ()
FooB :: Foo Int
f :: a -> Foo (F a) -> () -- F a can only be () so only FooA is accepted
f _ FooA = ()
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