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## Discussion
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[ http://www.haskell.org/ghc/dist/current/docs/users_guide/type-extensions.html\#stand-alone-deriving](http://www.haskell.org/ghc/dist/current/docs/users_guide/type-extensions.html#stand-alone-deriving) describes an implementation of something very like this in GHC.
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[ http://haskell.org/haskellwiki/GHC/Stand-alone_deriving_declarations](http://haskell.org/haskellwiki/GHC/Stand-alone_deriving_declarations) contains a great discussion of some of these ideas. (NB. Section 3 is misleading: leaving the clauses out of an instance declaration *does not* leave all the methods undefined; rather it gives the default methods of the class). |
