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util.toposort- Topological sort
(<node> <downstream> <downstream2> ...)
<node>is connected to other nodes
<node>can be arbitrary object, as far as it can be compared by the procedure eqproc, which is eqv? by default (See section 6.1 Equivalence). Returns a list of
<node>s sorted topologically.
If the graph contains circular reference, an error is signalled.