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

[Lars Ingebrigtsen]

Okam <okamsn@protonmail.com> writes:

> 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))

Perhaps Stefan has an opinion here; added to the CCs.

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