[m-dev.] Rethink of impurity w.r.t. solver code in negated contexts

[Ralph Becket]

Mark Brown, Wednesday,  7 December 2005:
> > At the moment main can be impure and the compiler will not complain.  I 
> > don't really see an issue with this, but I thought I'd just point that 
> > out.
> 
> Oh... didn't realise that.  This means section 9.1 of the reference manual
> doesn't match what the compiler does.  In any case my point is still the same,
> for a suitable interpretation of "misbehaves".  ;-)

Of course, it's not clear what "impure" means in the context of a
predicate that does IO...
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