Xonsh had been orphaned and retired. It was removed from Fedora 30. I adopted and unretired the package, and updated it to version 0.8.12. This update reintroduces xonsh to Fedora 30.
Updates may require up to 24 hours to propagate to mirrors. If the following command doesn't work, please retry later:
sudo dnf install --refresh --advisory=FEDORA-2019-0b46e5934f \*
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