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17 lines
313 B
Haskell
17 lines
313 B
Haskell
{-# LANGUAGE FunctionalDependencies #-}
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-- | Something.
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class Foo a b | a -> b
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class Bar a b | a -> b, b -> a where
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bar :: a
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-- | Something else.
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class Baz a b c d
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| a b -> c d -- Foo
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, b c -> a d -- Bar
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, a c -> b d -- Baz
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, a c d -> b
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, a b d -> a b c d where
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baz :: a -> b
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