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module ShouldFail where
-- !!! weird class/instance examples off the haskell list
--
class Foo a where foo :: a -> a
class Foo a => Bar a where bar :: a -> a
instance Num a => Foo [a] where
foo [] = []
foo (x:xs) = map (x+) xs
instance (Eq a, Show a) => Bar [a] where
bar [] = []
bar (x:xs) = foo xs where u = x==x
v = show x
------------------------------------------
{-
class Foo a => Bar2 a where bar2 :: a -> a
instance (Eq a, Show a) => Foo [a]
instance Num a => Bar2 [a]
data X a = X a
-}
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