texmath-0.12.5: test/writer/tex/maction-02.test

<<< native
[ EDelimited
    "("
    ")"
    [ Right
        (EArray
           [ AlignCenter ]
           [ [ [ EIdentifier "n" ] ] , [ [ EIdentifier "k" ] ] ])
    ]
]
>>> tex
\begin{pmatrix}
n \\
k \\
\end{pmatrix}