texmath-0.13.1.2: test/writer/mml/msubsup1.test

<<< native
[ ESubsup (ESymbol Op "\8747") (ENumber "0") (ENumber "1")
, EGrouped
    [ ESuper (EIdentifier "\8519") (EIdentifier "x")
    , ESymbol Ord "\8290"
    , EGrouped [ ESymbol Ord "\8518" , EIdentifier "x" ]
    ]
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <msubsup>
      <mo>∫</mo>
      <mn>0</mn>
      <mn>1</mn>
    </msubsup>
    <mrow>
      <msup>
        <mi>ⅇ</mi>
        <mi>x</mi>
      </msup>
      <mi>&#8290;</mi>
      <mrow>
        <mi>ⅆ</mi>
        <mi>x</mi>
      </mrow>
    </mrow>
  </mrow>
</math>