texmath-0.12.8: test/writer/tex/mtableAwidth2.test

<<< native
[ EArray
    [ AlignCenter , AlignCenter ]
    [ [ [ EIdentifier "a" ] , [ EIdentifier "b" ] ]
    , [ [ EIdentifier "x" ] , [ EIdentifier "y" ] ]
    ]
]
>>> tex
\begin{matrix}
a & b \\
x & y
\end{matrix}