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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Defining an array in a let clause.
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 (message from Heime on Mon, 05 Dec 2022 11:40:44 +0000)
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> Date: Mon, 05 Dec 2022 11:40:44 +0000
> From: Heime <heimeborgia@protonmail.com>
> 
> 
> How can I set up an array of five elements in a let clause.
> 
>   (let ( (ss (nth 0 (decode-time)))    ; seconds
>          (mm (nth 1 (decode-time)))    ; minutes
>          (hh (nth 2 (decode-time)))    ; hours
>          (us (nth 2 (current-time)))   ; microsecond
>          (ps (nth 3 (current-time)))   ; picosecond
>          (lc (make-array '(5))) )

There are no arrays in Emacs.  Do you mean vector? if so use the function
'vector' to construct a vector.  If, OTOH, you want a list, use the function
'list' instead.