[m-dev.] Making goals in negated contexts with inst any args impure

[Ralph Becket]

Julien Fischer, Wednesday, 12 October 2005:
> 
> Couldn't you just do this during mode checking?

It's easier if I do it afterwards.  A pure (solver) goal is still impure
if it appears in a negated context and has an inst any argument.  Under
the proposed change we will require the programmer to explicitly mark
such goals as impure.  I can't see any easy way to run purity checking
before mode analysis and not have it complain about pure goals of this
kind which have been properly marked as impure.

-- Ralph
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