mypy

c2c72da2 - Don't infinite loop on self deps in --follow-imports=normal (#9302)

Don't infinite loop on self deps in --follow-imports=normal (#9302) There are situations in complex SCCs where the semantic analyzer will infer self dependencies, which will cause an infinite loop in `dmypy --follow-imports=normal`. It's probably a bug that we do that, and that should be fixed to, but fixing a graph algorithm to not infinite loop on self edges seems like a reasonable thing to do in any case. I don't have a minimized test case yet, and am submitting this without one because it should be harmless and because I want it to get into the release.