Until now, that macro would expand to something like:
(export guile3.0-git)
where 'guile3.0-git' is actually a macro (produced by
'define-deprecated'), which would thus be skipped by 'fold-packages'.
Consequently, "guix install guile3.0-git" would say that no such package
exists.
* gnu/packages/guile.scm (define-deprecated-guile3.0-package): Add
'old-name' and export it.
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