texmath-0.12.5: test/writer/eqn/mtableAwidth2.test

<<< native
[ EArray
    [ AlignCenter , AlignCenter ]
    [ [ [ EIdentifier "a" ] , [ EIdentifier "b" ] ]
    , [ [ EIdentifier "x" ] , [ EIdentifier "y" ] ]
    ]
]
>>> eqn
matrix{
ccol{ a above x }
ccol{ b above y }
}