A few months ago, Maxime Devos worked on a new rust-build-system to
handle a few issues we were experiencing with cargo (see discussions on
antioxidant in guix-devel).
A month ago, we discussed about the possibility of the integration in
core guix, and the required steps. Maxime and I had a different
approach. Maxime highlighted the possibility to make a smooth transition
but once that would require many gradual changes and deprecation. My
approach was that since we'll have to eventually migrate all packages to
rust-build-system, and since we can freeze all former rust packages in
an archive channel, I would be clearer to make the transition at once.
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