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

<<< native
[ ESuper
    (EIdentifier "v")
    (ESuper
       (EIdentifier "w")
       (ESuper
          (EIdentifier "x") (ESuper (EIdentifier "y") (EIdentifier "z"))))
]
>>> tex
v^{w^{x^{y^{z}}}}