texmath-0.12.5: test/roundtrip/mfencedBfences7.native

[ EDelimited
    "("
    ")"
    [ Right
        (EGrouped [ EIdentifier "a" , ESymbol Bin "+" , EIdentifier "b" ])
    ]
, ESymbol Bin "+"
, EDelimited
    "("
    ")"
    [ Right (EFraction NormalFrac (ENumber "1") (ENumber "2")) ]
]