texmath-0.12.5: test/writer/eqn/msup-10.test

<<< native
[ ESuper (EIdentifier "S") (ENumber "2")
, ESymbol Rel "="
, EUnder
    False
    (ESuper (EIdentifier "S") (ENumber "2"))
    (EPhantom (EIdentifier "fail"))
]
>>> eqn
S sup 2 = {S sup 2} from {hphantom fail}