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The following macro \mytest should 1) evaluate it's argument and 2) typeset it verbatim. The output looks ok for me, but the log files says:

LaTeX Info: Active space character found while output routine is active

(This is related to \AddToHook. Without it I do not get this message.)

Is there something wrong with the code? How can I get rid of this info?

\documentclass{article} \ExplSyntaxOn \NewDocumentCommand\mytest{+v} { \AddToHook{shipout/background}{ \put(20,-100){ \begin{minipage}[t]{120mm} #1 \end{minipage} } } \tl_set_rescan:Nnn\l_tmp_tl{}{#1} \tl_use:N\l_tmp_tl } \ExplSyntaxOff \begin{document} test \mytest{ aaa \fbox{bbb} ccc} \end{document}
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1 Answer 1

Reset to default
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within the output routine an active space is defined to give the message you show, but you could locally define it to give the "normal" active definition, eg \obeyspaces

\documentclass{article} \ExplSyntaxOn \NewDocumentCommand\mytest{+v} { \AddToHook{shipout/background}{ \put(20,-100){ \begin{minipage}[t]{120mm} {\obeyspaces#1} \end{minipage} } } \tl_set_rescan:Nnn\l_tmp_tl{}{#1} \tl_use:N\l_tmp_tl } \ExplSyntaxOff \begin{document} test \mytest{ aaa \fbox{bbb} ccc} \end{document}
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  • 1
    Was this message added recently? I don't remember seeing this message in this case before. Commented Jul 22 at 20:58
  • @AndreasMatthias well it's been there a while, it was added with this change % \changes{v1.0n}{1994/04/30}{\cs{@activechar@warning} changed to % \cs{@activechar@info}} Commented Jul 22 at 21:48
  • @AndreasMatthias actually that was when it was changed, the message actually dates from the year before % RmS 93/09/06: Commented Jul 22 at 21:50
  • Oups, that's interesting. I'm using this code (slightly different) in unittests. And I know that this message did not appear until I updated my TeX system yesterday. Anyway, it's working fine now with \obeyspaces. Thanks. Commented Jul 22 at 22:12

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