passed

ElementaryMathExamples-mscarries04

test for : mscarries crossout='none'

W3C sample	WIRIS
	$212 2,327 - 1,156 1,171$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mstack>
    <mscarries crossout="none">
      <mn>2</mn>
      <mn>12</mn>
      <mscarry crossout="none">
        <none/>
      </mscarry>
    </mscarries>
    <mn>2,327</mn>
    <msrow>
      <mo>-</mo>
      <mn>1,156</mn>
    </msrow>
    <msline/>
    <mn>1,171</mn>
  </mstack>
</math>

Author: Yecheng Gu