texmath-0.13.1.2: test/writer/mml/embStretch1.test

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