Guix, I noticed that 'tcc-boot0' from (gnu packages commencement) is downloaded from what appears to be a GitLab-generated tarball (this is on the 'core-updates' branch).
To ensure that any revision of Guix can be easily bootstrapped "forever", it would be great to mirror this and adjust the URL in case GitLab generates a new one, like we've seen GitHub do in the past.
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