msup-08.test

<<< native
[ ESuper (ENumber "2") (ESuper (ENumber "3") (ENumber "4"))
, ESymbol Rel "="
, ESuper
    (ENumber "2")
    (ESuper
       (ENumber "3") (EOver False (ENumber "4") (EPhantom (ENumber "5"))))
]
>>> eqn
2 sup {3 sup 4} = 2 sup {3 sup {4 to {hphantom 5}}}