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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: Generic `tree-seq` function definition?
Date: Fri, 06 Sep 2013 11:17:07 -0400
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> (defun tree-seq (branch? children root)
>   (cl-labels ((walk (node)
>                     (cons node
>                           (if (funcall branch? node)
>                               (cl-mapcan 'walk (cddr (funcall children
                                           ^^^^^

This is the `walk' symbol.  You want the `walk' function instead.
I.e. use #'walk


        Stefan