texmath-0.13.1.2: test/writer/tex/mfrac7.test

<<< native
[ EFraction
    NormalFrac
    (EGrouped
       [ EIdentifier "x"
       , ESymbol Bin "+"
       , EIdentifier "y"
       , ESymbol Bin "+"
       , EIdentifier "z"
       ])
    (EGrouped
       [ EIdentifier "x"
       , EPhantom (ESymbol Bin "+")
       , EPhantom (EIdentifier "y")
       , ESymbol Bin "+"
       , EIdentifier "z"
       ])
]
>>> tex
\frac{x + y + z}{x\phantom{+}\phantom{y} + z}