texmath-0.12.5: test/writer/eqn/msup-07.test

<<< native
[ ESuper (EIdentifier "a") (ENumber "2")
, ESymbol Rel "="
, ESuper
    (EIdentifier "a")
    (EOver False (ENumber "2") (EPhantom (EIdentifier "x")))
]
>>> eqn
a sup 2 = a sup {2 to {hphantom x}}