texmath-0.12.5: test/writer/tex/munderover-10.test

<<< native
[ EUnderover
    False (EIdentifier "B") (EIdentifier "under") (EIdentifier "over")
, ESymbol Rel "="
, EOver
    False
    (EUnder False (EIdentifier "B") (EIdentifier "under"))
    (EIdentifier "over")
]
>>> tex
\underset{under}{\overset{over}{B}} = \overset{over}{\underset{under}{B}}