b1ace388c0
This patch has been extracted from #123720. It specifically enhances `Sccs` to allow tracking arbitrary commutative properties of SCCs, 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 straightforward "find max/min" operation during SCC construction. 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. |
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