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+{-# LANGUAGE PatternSynonyms, PolyKinds, TypeOperators #-}
+
+-- | Testing some pattern synonyms
+module PatternSyns where
+
+-- | FooType doc
+data FooType x = FooCtor x
+
+-- | Pattern synonym for 'Foo' x
+pattern Foo x = FooCtor x
+
+-- | Pattern synonym for 'Bar' x
+pattern Bar x = FooCtor (Foo x)
+
+-- | Pattern synonym for (':<->')
+pattern x :<-> y = (Foo x, Bar y)
+
+-- | Doc for ('><')
+data (a :: *) >< b = Empty
+
+-- | Pattern for 'Empty'
+pattern E = Empty