X-Debbugs-CC: ludo@gnu.org
X-Debbugs-CC: iskarian@mgsn.dev

Hi guix,

These three patches allows (guix upstream) to replace the values in the surrounding 'let'
form, if any.  It's important for constructs like:

(define-public gnash
   (let ((version "0.8.11")
         (commit "583ccbc1275c7701dc4843ec12142ff86bb305b4")
         (revision "0"))
     (package
       (name "gnash")
       (version (git-version version revision commit))
       (source (git-reference
                 (url "https://example.org")
                 (commit commit)))
       [...])))

such that it can update the version, commit, revision. (Currently only the
version will be updatable, but see <https://issues.guix.gnu.org/50072#0>
and <https://issues.guix.gnu.org/50072#9> for work on making 'commit' updatable).

More details in the patches themselves.

Greetings,
Maxime