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{-# LANGUAGE ImplicitParams #-}
{-# OPTIONS -dcore-lint #-}
-- The dict-bindings attached to an IPBinds
-- need not be in recursive order. This is
-- a long-standing bug, which lasted up to
-- and including GHC 6.4.2
module Bug795(foo) where
data Arg = E Integer | T Bool deriving (Eq, Show)
foo :: Integer -> [Arg] -> IO String
foo 1 as = do { let ?err = "my custom error"
; let ws = (show (firstE as))
; return (show (firstE as)) }
firstE :: (?err :: String) => [Arg] -> Integer
firstE = error "urk"
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