moAprime16.test

<<< native
[ ESuper (EIdentifier "f") (ESymbol Accent "'")
, EDelimited "(" ")" [ Right (EIdentifier "x") ]
, ESymbol Rel "="
, ESuper (EIdentifier "f") (ESymbol Ord "\8242")
, EDelimited "(" ")" [ Right (EIdentifier "x") ]
]
>>> eqn
f sup ' left ( x right ) = f' left ( x right )