texmath-0.12.5: test/writer/mml/msubsup-01.test

<<< native
[ ESubsup (EIdentifier "R") (ENumber "0") (ENumber "4")
, ESymbol Rel "="
, ESubsup
    (EIdentifier "R")
    (EGrouped [ ENumber "0" , EPhantom (EIdentifier "fail") ])
    (EGrouped [ ENumber "4" , EPhantom (EIdentifier "fail") ])
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <msubsup>
      <mi>R</mi>
      <mn>0</mn>
      <mn>4</mn>
    </msubsup>
    <mo>=</mo>
    <msubsup>
      <mi>R</mi>
      <mrow>
        <mn>0</mn>
        <mphantom>
          <mi>fail</mi>
        </mphantom>
      </mrow>
      <mrow>
        <mn>4</mn>
        <mphantom>
          <mi>fail</mi>
        </mphantom>
      </mrow>
    </msubsup>
  </mrow>
</math>