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

<<< native
[ EIdentifier "B"
, EUnderover
    False (ESymbol Op "\8594") (EIdentifier "f") (EGrouped [])
, EIdentifier "A"
, EUnderover
    False (ESymbol Op "\8592") (EIdentifier "f") (EGrouped [])
, EIdentifier "C"
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mi>B</mi>
    <munderover>
      <mo>→</mo>
      <mi>f</mi>
      <mrow />
    </munderover>
    <mi>A</mi>
    <munderover>
      <mo>←</mo>
      <mi>f</mi>
      <mrow />
    </munderover>
    <mi>C</mi>
  </mrow>
</math>