> (defadvice TeX-region-create (around preview-counters)
>   "Write out counter information to region."
>   (let ((TeX-region-extra
>          (concat
>           (and (boundp 'begin)
>                 ^^^^^^^^^^^^^
>                preview-buffer-has-counters
>                (mapconcat
>                 #'identity
>                 (cons
>                  ""
>                  (preview-counter-find (symbol-value 'begin)))
>                                         ^^^^^^^^^^^^^^^^^^^
>                 "\\setcounter"))
>           TeX-region-extra)))
>     ad-do-it))

Duh!  Thanks for the heads up!
Indeed, `defadvice` hides the code from the byte-compiler which is why
I didn't get a warning for the (boundp 'begin).
And I clearly forgot my usual scan of `(set `.


        Stefan


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