Don't infinite loop on self deps in --follow-imports=normal #9302
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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.
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JukkaL
approved these changes
Aug 14, 2020
| # Filter anything already seen before. This prevents | ||
| # infinite looping if there are any self edges. (Self | ||
| # edges are maybe a bug, but...) | ||
| sources2 = [source for source in sources2 if source.module not in seen] |
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Would it be better to do this filtering in direct_imports?
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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 too, 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.