texmath-0.7: tests/readers/mml/msupBsize2.native

[ESuper (EIdentifier "x") (ENumber "1"),ESymbol Bin "+",ESuper (EIdentifier "x") (EIdentifier "a"),ESymbol Bin "+",ESuper (EIdentifier "H") (EIdentifier "a"),ESymbol Bin "+",ESuper (EIdentifier "H") (ENumber "1")]