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{-# OPTIONS -XFunctionalDependencies -XUndecidableInstances -XFlexibleInstances #-}
module T5684 where
class B a b | a -> b where
op :: a -> b -> ()
class A a | -> a
instance A b => B Bool b
flop4 = [ op 'c' undefined
, op False False
, op True undefined
]
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