check whether expanded is a primitive #1028
Merged
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Motivation for this change
In the lights of https://tex.stackexchange.com/questions/603455/beamer-error-due-to-pgf-package I think it is a good idea to test whether the
\expanded
primitive is available, and if not throw a meaningful error message and abort the current TeX run (similar to how the checks for e-TeX are currently enforced). This PR does just that inside ofpgfkeys.code.tex
in an engine independent way.Checklist
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