mfenced-01.test

<<< native
[ EDelimited
    "["
    "]"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter , AlignCenter ]
           [ [ [ EIdentifier "A" ]
             , [ EIdentifier "B" ]
             , [ EIdentifier "C" ]
             ]
           , [ [ EIdentifier "D" ]
             , [ EIdentifier "E" ]
             , [ EIdentifier "F" ]
             ]
           , [ [ EIdentifier "G" ]
             , [ EIdentifier "H" ]
             , [ EIdentifier "I" ]
             ]
           ])
    ]
]
>>> tex
\begin{bmatrix}
A & B & C \\
D & E & F \\
G & H & I \\
\end{bmatrix}