texmath-0.12.5: test/writer/tex/msubsup-08.test

<<< native
[ ESubsup (EIdentifier "A") (EIdentifier "B") (EIdentifier "C")
, ESymbol Rel "="
, ESubsup (EIdentifier "A") (EIdentifier "B") (EIdentifier "C")
, EPhantom
    (EFraction NormalFrac (EIdentifier "test") (EIdentifier "failed"))
]
>>> tex
A_{B}^{C} = A_{B}^{C}\phantom{\frac{test}{failed}}