bors
8cf5101d77
Extend SCC construction to enable extra functionality Do YOU feel like your SCC construction doesn't do enough? Then I have a patch for you! SCCs can now do *everything*! Well, almost. This patch has been extracted from #123720. It specifically enhances `Sccs` to allow tracking arbitrary commutative properties (think min/max mappings on nodes vs arbitrary closures) of strongly connected components, including - reachable values (max/min) - SCC-internal values (max/min) This helps with among other things universe computation. We can now identify SCC universes as a reasonably straightforward "find max/min" operation during SCC construction. This is also included in this patch. It's also more or less zero-cost; don't use the new features, don't pay for them. This commit also vastly extends the documentation of the SCCs module, which I had a very hard time following. It may or may not have gotten easier to read for someone else. I believe this logic can also be used in leak check, but haven't checked. Ha. ha. Ha.
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