texmath-0.13.1.2: test/writer/mml/msub-06.test

<<< native
[ ESub (EIdentifier "U") (EIdentifier "t")
, ESymbol Rel "="
, ESub (EIdentifier "U") (EIdentifier "t")
, EPhantom
    (EFraction NormalFrac (EIdentifier "test") (EIdentifier "failed"))
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <msub>
      <mi>U</mi>
      <mi>t</mi>
    </msub>
    <mo>=</mo>
    <msub>
      <mi>U</mi>
      <mi>t</mi>
    </msub>
    <mphantom>
      <mfrac>
        <mi>test</mi>
        <mi>failed</mi>
      </mfrac>
    </mphantom>
  </mrow>
</math>