texmath-0.12.5: test/writer/eqn/msup2.test

<<< native
[ ESuper
    (EDelimited
       "("
       ")"
       [ Right
           (EGrouped [ EIdentifier "x" , ESymbol Bin "+" , EIdentifier "y" ])
       ])
    (ENumber "2")
]
>>> eqn
{left ( {x + y} right )} sup 2