texmath-0.12.5: test/roundtrip/msupBsize3.native

[ ESuper (ESymbol Op "\8747") (ENumber "1")
, ESymbol Bin "+"
, ESuper
    (EFraction NormalFrac (EIdentifier "x") (EIdentifier "y"))
    (EIdentifier "a")
, ESymbol Bin "+"
, ESuper
    (EFraction NormalFrac (EIdentifier "x") (EIdentifier "y"))
    (ENumber "1")
, ESymbol Bin "+"
, ESuper (ESymbol Op "\8747") (EIdentifier "a")
, ESymbol Bin "+"
, ESuper (ESymbol Op "\8747") (EIdentifier "a")
]