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+{-# LANGUAGE PatternSynonyms, TypeOperators, TypeFamilies, MultiParamTypeClasses, GADTs #-}
+-- | Test operators with or without fixity declarations
+module Operators where
+
+-- | Operator with no fixity
+(+-) :: a -> a -> a
+a +- _ = a
+
+-- | Operator with infixr 7
+(*/) :: a -> a -> a
+_ */ b = b
+infixr 7 */
+
+-- | Named function with infixl 3
+foo :: a -> a -> a
+foo a _ = a
+infixl 3 `foo`
+
+-- | Data type with operator constructors
+data Foo
+  = Foo `Bar` Foo -- ^ Has infixl 3
+  | Foo :- Foo  -- ^ Has infixr 5
+infixr 5 :-
+infixl 3 `Bar`
+
+-- | Pattern synonym, infixr 3
+pattern (:+) a b <- [a,b]
+infixr 3 :+
+
+-- | Type name, infixl 6 and GADT constructor
+data (a <-> b) where
+  (:<->) :: a -> b -> a <-> b
+infixl 6 <->
+infixr 6 :<->
+
+-- | Type family with fixity
+type family a ++ b
+infix 3 ++
+
+-- | Data family with fixity
+data family a ** b
+infix 9 **
+
+-- | Class with fixity, including associated types
+class a ><> b where
+  type a <>< b :: *
+  data a ><< b
+  (>><) :: a -> b -> ()
+infixr 1 ><>
+infixl 2 <><
+infixl 3 ><<
+infixr 4 >><
+
+-- | Type synonym with fixity
+type (a >-< b) = a <-> b
+infixl 6 >-<