This is an auto-filled bug because dev-python/txaio fails tests. The issue was originally discovered on arm64, but it may be reproducible on other arches as well. If you think that a different summary clarifies the issue better, feel free to change it. Attached build log and emerge --info.
Created attachment 635440 [details] build.log build log and emerge --info
I can confirm the errors on my odroid-c2 arm64 system. However, I have just added txaio-20.4.1 to the tree yesterday. I can confirm that it passes all tests on arm64 for both python-3.6 as well as 3.7. python-3.8 is not yet unmasked for arm64, so could not test that yet, but they did pass 3.8 on amd64. This version will be removed as soon as I can stable the new release.
Fixed in current version in tree