(fast-alist-summary) prints some basic statistics about any current fast alists.

This documentation topic relates to the experimental extension of ACL2 supporting hash cons, fast alists, and memoization; see hons-and-memoization.

Logically, fast-alist-summary just returns nil; we leave it enabled and would think it odd to ever prove a theorem about it.

Under the hood, this function gathers and prints some basic statistics about the current fast alists. It may be useful for identifying fast alists that should have been freed with fast-alist-free.