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I'm using Beamer with the XeTeX backend and initially I got lots of warnings of the following form:

[WARNING] Missing character: There is no in font [lmmono10-regular]:!

So I went and added \newunicodechar commands for each of them, e.g.

\newunicodechar{∙}{\makebox[\fontcharwd\font`a]{$\bullet$}}

And they all work, I've got almost 30 lines all similar for various Unicode characters. However, this fails for the unicode PRIME character . Once I add the following line:

\newunicodechar{′}{\makebox[\fontcharwd\font`a]{$\prime$}}

I start getting the following error:

Error producing PDF.
! TeX capacity exceeded, sorry [input stack size=5000].
\__um_scanprime_collect:N ...canprime_collect:N #1
                                                  }{\peek_meaning_remove:NTF...
l.277 ...erTok{→} \DataTypeTok{Set} \OtherTok{_}

I'm using Beamer via Pandoc if that matters.

  • I get no error if unicode-math is not used; I get a different error than stated if I load unicode-math. Anyway, you should do \AtBeginDocument{\newunicodechar{′}{\makebox[\fontcharwd\font`a]{$\prime$}}} – egreg Oct 8 at 12:15
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Judging from the error message you're using unicode-math.

The problem is that this package assigns a value to the “active ” at begin document, thus overriding what your \newunicodechar does.

Solution: postpone \newunicodechar.

\documentclass{article}
\usepackage{unicode-math}
\usepackage{newunicodechar}

\AtBeginDocument{\newunicodechar{′}{\makebox[\fontcharwd\font`a]{$\prime$}}}

\begin{document}

a′

\end{document}
  • Thanks! I'm not using unicode-math myself, but I guess Pandoc includes it automatically. – Cactus Oct 8 at 13:46

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