<<< native [ ESubsup (ESymbol Op "\8750") (ENumber "0") (ENumber "1") , EIdentifier "f" , EDelimited "(" ")" [ Right (EIdentifier "x") ] , ESpace (1 % 9) , ESymbol Ord "\8518" , EIdentifier "x" ] >>> tex \oint_{0}^{1}f(x)\mspace{2mu}\mathbb{d}x