Follow-up Comment #7, bug #63650 (project make):
I don't think it is reasonable to cache environment. The number of operations
needed for a single expansion is a very fast growing sequence.
So if it will help with e.g. n=5, n=6 will still take a long time to compute.
Maybe just show a warning when recursion is detected?
I'll try to think what can be done with algorithm.
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