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ormolu/data/examples/declaration/class/functional-dependencies.hs

17 lines
305 B
Haskell

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