texmath-0.12.5: test/writer/mml/msup2.test

<<< native
[ ESuper
    (EDelimited
       "("
       ")"
       [ Right
           (EGrouped [ EIdentifier "x" , ESymbol Bin "+" , EIdentifier "y" ])
       ])
    (ENumber "2")
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <msup>
    <mrow>
      <mo stretchy="true" form="prefix">(</mo>
      <mrow>
        <mi>x</mi>
        <mo>+</mo>
        <mi>y</mi>
      </mrow>
      <mo stretchy="true" form="postfix">)</mo>
    </mrow>
    <mn>2</mn>
  </msup>
</math>