Comments & Wishes ⇒ \vphantom bug

[thomasb]

Here :

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\documentclass{book}
\newcommand{\intervalle}[4]{\mathopen{#1}#2\mathpunct{};#3\mathclose{#4}}
\newcommand{\intervalleoo}[2]{\intervalle
  {\left. 
      {\vphantom{\int_0^1}} % the problem comes from here... comment-uncomment
    \right]}
  {#1}{#2}
  {\left[ \right.}}
\begin{document} 
Here it always works : $\intervalleoo{0}{2\pi}$
\subsection{Here it doesn't always work : $\intervalleoo{0}{2\pi}$}
\end{document}

[SOLVED] : add

Code: Select all

\protected\def\myphantom#1{\vphantom{#1}}

[Stefan Kottwitz]

That's because \vphantom is a fragile command.

You could protect it from breaking:

Code: Select all

\protected\def\myphantom#1{\vphantom{#1}}

\newcommand{\intervalleoo}[2]{\intervalle
  {\left. 
      {\myphantom{\int_0^1}} % the problem comes from here... comment-uncomment
    \right]}
  {#1}{#2}
  {\left[ \right.}}

Stefan