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

[Ralph Becket]

I want to make the compiler report an error if a program features an
inst any variable in a goal in a negated context where that goal has
not been declared impure.

I think the right thing to do is to move purity analysis until after
mode analysis and add the new checks to purity.m

Can anyone see a problem with this before I start hacking?

-- Ralph
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