texmath-0.12.5: test/writer/eqn/munder-01.test

<<< native
[ EUnder False (EIdentifier "BASE") (EIdentifier "under")
, ESymbol Rel "="
, EUnder
    False
    (EUnder False (EIdentifier "BASE") (EIdentifier "under"))
    (EPhantom (EIdentifier "under"))
]
>>> eqn
BASE from under = {BASE from under} from {hphantom under}