<<< 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 sup prime left ( x right )