bug#49809: [PATCH] Add macro 'pcase-setq'

[Okam]

Hello,

This patch adds a `setq`-like equivalent to `pcase-let`.  This is
convenient when one wants the bindings to exist outside of a `let` form.

This macro expands into multiple `setq` calls that are combined where
possible.


     ;; => (1 2 3 4)
     (let (a b c d)
       (pcase-setq a 1
                   b 2
                   `[,c ,d] [3 4])
       (list a b c d))


Please let me know what should be changed.

Thank you.

0001-Add-macro-pcase-setq.patch
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