[m-rev.] for review: type_spec and typeclass constraints

[Fergus Henderson]

On 20-Aug-2002, Mark Brown <dougl at cs.mu.OZ.AU> wrote:
> 
> Not requiring the caller to construct and pass a dictionary can surely
> be a significant efficiency gain, can't it?

Yes.

> in the case that the ground constraint is
> not explicitly present but comes about because of a type_spec request, I
> think it is highly likely that the programmer is trying to avoid the need
> for a caller to provide a dictionary at run time.  Requiring the
> typeclass instance to be visible to the callee is, IMHO, a relatively small
> price to pay to achieve this.

I agree.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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