Ozgur Akgun <ozgurak...@gmail.com> writes: > Can a user define a derivable type class of her own? No.
The derivable classes are defined in the Haskell Report; GHC does allow some others to be derived with extensions however. There is one exception to this: using the GeneralizedNewtypeDeriving extension, if type Foo instantiates a typeclass Baz, then you can derive Baz for newtype Bar = Bar Foo. -- Ivan Lazar Miljenovic ivan.miljeno...@gmail.com IvanMiljenovic.wordpress.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
