texmath-0.12.5: test/roundtrip/munder-08.native

[ EUnder
    False (EIdentifier "_ baseline _") (EIdentifier "under script")
, ESymbol Rel "="
, EUnder
    False
    (EOver
       False (EIdentifier "_ baseline _") (EPhantom (EIdentifier "fail")))
    (EIdentifier "under script")
]