testsuite/tests/typecheck/should_compile/tc054.hs


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module ShouldSucceed where

class Eq' a where
 doubleeq :: a -> a -> Bool

class (Eq' a) => Ord' a where
 lt :: a -> a -> Bool

instance Eq' Int where
 doubleeq x y = True

instance Ord' Int where
 lt x y = True

f x y | lt x 1 = True
      | otherwise = False