This works, but it's not very efficient in terms of CPU.

This technique is used in software verification tools that do depth-first search on transition graphs. Often these graphs are much too large to fit into memory, so they are lazily generated and discarded of, so schemes like this are the only rescue.

In reply to Re^5: Completeness of Devel::Size answers by moritz
in thread Completeness of Devel::Size answers by gone2015

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