texmath-0.12.5: test/roundtrip/msupSadvance1.native
[ ESuper (EIdentifier "H") (ENumber "2") , ESymbol Bin "+" , ESuper (EIdentifier "\8459") (ENumber "2") ]
[ ESuper (EIdentifier "H") (ENumber "2") , ESymbol Bin "+" , ESuper (EIdentifier "\8459") (ENumber "2") ]