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Was initially creating this as a utility for a test-harness; but realized it's a bit of a cleaner approach to debugging that's external to any particular collector.
For the moment, I've left the existing
debug
machinery in both the clients; but some of it may be redundant now?Additionally, this adds a "noop" collector, which when used with the
Debug_collector
functor, results in an implementation that just prints to stdout.