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{-# LANGUAGE GADTs, ExistentialQuantification #-}
{-# OPTIONS_GHC -O -fno-warn-overlapping-patterns #-}
-- #2587
-- Actually this bug related to free variables and
-- type lets, but ostensibly it has a GADT flavour
-- Hence being in the GADT directory.
module GadtBug(bug) where
data Existential = forall a . Existential (Gadt a)
data Gadt a where Value :: Gadt Double
bug = [ match undefined | ps <- undefined, _ <- ps ]
where
match (Existential _) = undefined
match (Existential _) = undefined
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