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{-# LANGUAGE ImplicitParams #-}
module ShouldCompile where
data UniqueSupply = US Integer
newUnique :: (?uniqueSupply :: UniqueSupply) => Integer
newUnique = r
where US r = ?uniqueSupply
-- The lazy pattern match in the where clause killed GHC 5.04
-- because the type {?uniqueSupply::UniqueSupply} of the RHS
-- of the 'where' didn't look like a UniqueSupply
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