texmath-0.7: tests/writers/mfenced-06.tex
\left\lbrack \begin{array}{l}
U \\
V \\
\end{array} \right| = \left| \begin{array}{l}
U \\
V \\
\end{array} \right\rbrack
\left\lbrack \begin{array}{l}
U \\
V \\
\end{array} \right| = \left| \begin{array}{l}
U \\
V \\
\end{array} \right\rbrack