texmath-0.12.5: test/writer/mml/msub-05.test

<<< native
[ ESub (EIdentifier "A") (EIdentifier "B")
, ESymbol Rel "="
, ESub (EIdentifier "A") (EIdentifier "B")
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <msub>
      <mi>A</mi>
      <mi>B</mi>
    </msub>
    <mo>=</mo>
    <msub>
      <mi>A</mi>
      <mi>B</mi>
    </msub>
  </mrow>
</math>