On 1/11/07, David Roundy <[EMAIL PROTECTED]> wrote:
I think we'd really like to apply it not to the method, but to the instance
itself. So that use of the Show instance of Control.Exception.Exception
would be deprecated. This'd be more severe, since there might be classes
that depend on a show instance, but don't actually use it.
Another possibility for this particular problem would be to be able to
rewrite the show instance. If we could just remove the stupid "User
error:" text from the show instance, I don't think it'd be a bug to use it
anymore.
I did a little testing and it turns out that you can actually achieve
what you want. Just write another Show instance for C.E.Exception and
import it wherever there is a possibility that a bad show might be
lurking. GHC will only complain about duplicate instances if you
actually use a method from the Show class with the particular type
which has several instances. So GHC is doing exactly what you want!
Cheers,
Josef
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