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I am trying to use LaTeX, BibTeX, and BibLaTeX to automatically build a
CV from a bib file. This requires a number of new bib entry types (e.g.,
funding, classes, talks, etc.) and fields. I am having trouble finding a
way to add entries without hacking the biblatex.bst and biblatex.sty
files. Is it ...

I was trying to add some text in an environment and then use that text elsewhere. The environ package lets me do this pretty easily, but before I found that package my solution involved:
\savebox{\mybox}\bgroup hello world \egroup
which worked fine until I loaded the xcolor package. While I ...

Thank you, I have now read the rules.

Usually the argument for the \savebox command needs to be grouped with curly braces.

Yes, I know. A slightly less minimal example that I think requires \bgroup and \egroup instead of curly braces is:


\documentclass{article}
\usepackage{xcolor}
\newsavebox ...

Although they do not seem related to me, I am having trouble using the xcolor package with a savebox and bgroup.

\documentclass{article}
\usepackage{xcolor}
\newsavebox{\mybox}
\savebox{\mybox}\bgroup hello world \egroup
\begin{document}
\usebox{\mybox}

\bgroup good bye world \egroup
\end ...