texmath-0.12.5: test/writer/eqn/msub-12.test

<<< native
[ ESub (EIdentifier "P") (ENumber "0")
, ESymbol Rel "="
, EUnderover
    False
    (ESub (EIdentifier "P") (ENumber "0"))
    (EPhantom (EIdentifier "x"))
    (EPhantom (EIdentifier "x"))
]
>>> eqn
P sub 0 = {P sub 0} from {hphantom x} to {hphantom x}