texmath-0.12.5: test/writer/eqn/msup-11.test

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