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Please file a bug report if you can indeed isolate/reproduce it (and please ping me on GitHub once you do)!
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I've made one for Phoenix (as per - it creates a cycle), though unstable compilation is a wider issue.

https://github.com/phoenixframework/phoenix/issues/6697

In case you want to see files affected I made extended writeup on my blog - for reference. https://xlii.space/eng/elixir-cycles/

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