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{-# LANGUAGE UnboxedTuples #-}
-- Could be ok, because nothing is bound to the unboxed tuple
-- but actually rejected, because a wild card is rather like
-- an unused variable. Could fix this, but it's really a corner case
module ShouldFail where
type T a = Int -> (# Int, Int #)
f2 :: T a -> T a
f2 t = \x -> case t x of _ -> (# 3,4 #)
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