Re: [Haskell-cafe] type/class question: toString

Hello, Have you tried using -fglasgow-exts? That should enable all ghc extensions. -Jeff haskell-cafe-bounces@haskell.org wrote on 11/06/2007 02:02:11 PM:

On Nov 6, 2007 12:15 PM, David Benbennick wrote:

...

In ghc 6.8.1, the error messages are more helpful:

foo.hs:5:0: Illegal instance declaration for `MyShow String' (All instance types must be of the form (T t1 ... tn) where T is not a synonym. Use -XTypeSynonymInstances if you want to disable this.) In the instance declaration for `MyShow String'

Thanks for the tip. I might give 6.8.1 a try; I still cannot get it to work in 6.6.1. The problem may exist between the keyboard and the chair.

G _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

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