texmath-0.12.5: test/roundtrip/03.native

[ EIdentifier "a"
, ESuper (EIdentifier "x") (ENumber "2")
, ESymbol Bin "+"
, EIdentifier "b"
, EIdentifier "x"
, ESymbol Bin "+"
, EIdentifier "c"
, ESymbol Rel "="
, ENumber "0"
]