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{-# LANGUAGE ImplicitParams, ExistentialQuantification #-}
-- Both these two fail in 6.2.2
module ShouldCompile where
-- A record with an 'existential' context that binds no
-- type vars, so record selectors should be OK
data Test1 = (?val::Bool) => Test1 { name :: String }
instance Show Test1 where
show p = name p
-- Same, but no record selector; GHC 6.2.2 failed because it tried
-- to derive generic to/from
data Test2 = (?val::Bool) => Test2 String
f (Test2 s) | ?val = s
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