texmath-0.12.5: test/writer/eqn/msub-06.test

<<< native
[ ESub (EIdentifier "U") (EIdentifier "t")
, ESymbol Rel "="
, ESub (EIdentifier "U") (EIdentifier "t")
, EPhantom
    (EFraction NormalFrac (EIdentifier "test") (EIdentifier "failed"))
]
>>> eqn
U sub t = U sub t hphantom {test over failed}