[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?

Okay, I've thought about this a little more: we can leave the current
pass ordering as is, but weaken purity.m so that it won't report a
purity error if it sees an call to a pure predicate in a negated
context.  I will add a check in modecheck_call.m to verify that
calls in negated contexts
- with inst any arguments are properly marked as impure
- are otherwise marked as impure iff the called pred is impure.

-- Ralph
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