code: function parsePostfixExpression() {
    var expr = parseLeftHandSideExpressionAllowCall();
  
    if (lookahead.type === TokenPunctuator) {
      if ((match('++') || match('--'))) {
        throw new Error(DISABLED);
      }
    }
  
    return expr;
  }
docs: 11.3 Postfix Expressions