[m-rev.] for review: improve standard library error handling

[Fergus Henderson]

On 30-Aug-2001, Simon Taylor <stayl at cs.mu.OZ.AU> wrote:
> 
> 	As discussed on mercury-users a while ago, math__pow(0.0, 0.0)
> 	should return 1.0. This is also consistent with float__pow.
> 	See <http://www.cs.mu.oz.au/research/mercury/mailing-lists/mercury-users/mercury-users.0104/0130.html>.

There was quite a bit of discussion on that.
See also http://www.cs.mu.oz.au/research/mercury/mailing-lists/mercury-users/mercury-users.0107/0006.html.

I'm not happy with that change, because if I understand correctly it
violates the LIA 2 standard.  float__pow(0.0, 0) should be one, but
math__pow(0.0, 0.0) should raise an exception.


-- 
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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