bug#45610: 27.1; Symbol’s function definition is void: seq-concatenate

[Eli Zaretskii]

> From: Leo Liu <sdl.web@gmail.com>
> Date: Sat, 02 Jan 2021 20:29:37 +0800
> 
> I have the following macro that is working until 27.1.
> 
> (defmacro cl-concatenatef (type place &rest sequences)
>   `(cl-callf2 cl-concatenate ,type ,place ,@sequences))
> 
> cl-concatenate is inlinable (since forever) as declared in cl-macs:
> 
>  (cl-proclaim '(inline cl-acons cl-map cl-concatenate cl-notany
>                 cl-notevery cl-revappend cl-nreconc gethash))
> 
> In 27.1 after expansion only (apply #'seq-concatenate type sequences)
> remains bypassing the cl-concatenate autoload which is supposed to load
> the dependency seq.el.

What did that expand to in Emacs 26?