On 2/28/06, Claus Reinke <[EMAIL PROTECTED]> wrote:
> I'm not sure what you're talking about? both hugs and ghc clearly
> specify that the more specific instance declaration is chosen when
> overlapping instance declarations are permitted.
I have trouble with this "more specific" term. It's not well-defined,
i.e. not a total order on possible instance declarations.
The point I was trying to make was that in the case where a
precondition (in this case, Fail a) does not apply, what stops the
resolution algorithm falling back on the other instance declaration?
--
Taral <[EMAIL PROTECTED]>
"Computer science is no more about computers than astronomy is about
telescopes."
-- Edsger Dijkstra
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