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Simon Peyton Jones authored
Standalone deriving of typeable now requires you to say instance Typeable1 Maybe which is exactly the shape of instance decl that is generated by a 'deriving( Typeable )' clause on the data type decl. This is a bit horrid, but it's the only consistent way, at least for now. If you say something else, the error messages are helpful. MERGE to 6.8 branch
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