texmath-0.13.1.2: test/roundtrip/msub-06.native

[ ESub (EIdentifier "U") (EIdentifier "t")
, ESymbol Rel "="
, ESub (EIdentifier "U") (EIdentifier "t")
, EPhantom
    (EFraction NormalFrac (EIdentifier "test") (EIdentifier "failed"))
]