<<< native [ ESqrt (EIdentifier "content") , ESymbol Rel "=" , ESqrt (ESub (EIdentifier "content") (EPhantom (EIdentifier "fail"))) , ESymbol Rel "=" , ESqrt (ESuper (EIdentifier "content") (EPhantom (EIdentifier "fail"))) ] >>> eqn sqrt content = sqrt {content sub {hphantom fail}} = sqrt {content sup {hphantom fail}}