texmath-0.12.5: test/writer/eqn/mfrac-08.test

<<< native
[ EFraction
    NormalFrac
    (EGrouped
       [ EPhantom (EIdentifier "a")
       , ENumber "12"
       , EPhantom (EIdentifier "a")
       ])
    (ENumber "13")
, ESymbol Rel "="
, EFraction
    NormalFrac
    (ENumber "12")
    (EGrouped
       [ EPhantom (EIdentifier "a")
       , ENumber "13"
       , EPhantom (EIdentifier "a")
       ])
]
>>> eqn
{hphantom a 12 hphantom a} over 13 = 12 over {hphantom a 13 hphantom a}