texmath-0.7: tests/readers/mml/msubsup-02.native
[ESubsup (EGrouped [EPhantom (EIdentifier "z"),EIdentifier "S"]) (EIdentifier "t") (ENumber "7"),ESymbol Rel "=",ESubsup (EIdentifier "S") (EIdentifier "t") (ENumber "7")]
[ESubsup (EGrouped [EPhantom (EIdentifier "z"),EIdentifier "S"]) (EIdentifier "t") (ENumber "7"),ESymbol Rel "=",ESubsup (EIdentifier "S") (EIdentifier "t") (ENumber "7")]