On Wed, 12 Dec 2001, Geir Magnusson Jr. wrote:

> Another approach I will try, assuming my drivel below is vaguely correct, is
> a wrapping Context that masks...  That way I can use one context, mark off
> the LHS, then mark off the RHS, and then iterate out the marked nodes, in
> order....
> 
> Should be no worse than current, and better because you short circuit the
> rhs...

And since UnionExpressions just aren't all that common (unlike Step or similar),
creating a new specialized Context isn't too bad.  

Go for it!

        -bob


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