\iftoggle inside theorem

Question

I have

\documentclass[11pt]{article}
\usepackage{amsthm}
\usepackage{etoolbox}
\newtoggle{sol}
\toggletrue{sol}
\newtheorem{theorem}{Theorem}
\begin{document}
\begin{theorem}
    Text
    \iftoggle{sol}{Text}
\end{theorem}
\end{document}

and I am getting and error sayin that \begin{theorem} was ended by \end{document}.

What might I be doing wrong?

Answer 1

\iftoggle expects three arguments. One for the toggle, one for the true-branch and one for false. You should use it like this:

\documentclass[11pt]{article}
\usepackage{amsthm}
\usepackage{etoolbox}
\newtoggle{sol}
\toggletrue{sol}
\newtheorem{theorem}{Theorem}
\begin{document}
\begin{theorem}
    Text
    \iftoggle{sol}{Text}{}
\end{theorem}
\end{document}

Without the additional {} \end gets eaten by \iftoggle.