A fairly simple change to my script fixed the problem.
In each call to &Recurse I additionally pass a
@stack list. This list contains all of the
'parent' nodes in the call tree. So when the function runs,
it checks to see if the node is present in @stack,
then I know there is circular reference.
So, the inital invocation of &Recurse becomes:
&Recurse($_,()), and subsequent calls (the
truly recursive ones) turn into: &Recurse($node,@stack,$node).
This works, although tilly has a much more compact solution. :-)
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