problem with a variable in pdfinfo, probably something obvious

[David Carlisle]

Now even harder to guess with no example code at all:_)

But in

with variants of this,

\newcommand{\mjmpagex}{\@@input \mjmbasename.last_page }
%\mjmaddbib{pages}{
\makeatletter
%\@@input \mjmbasename.last\_page
\mjmaddbib{pages}{\@@input \mjmbasename.last_page }
%\mjmaddbib{pages}{\mjmpagex}
\makeatother
%}
 %}
%\mjmpagex
%\mjmaddbib{pages}{\mjmpagex}



you are missing \makeatletter before the first definition
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