What is the test for a roll-up pleading?

At page 480 of Drake v. Overland Laycraft J.A. said this: The utility of such a rule of practice becomes evident on a review of these pleadings. The “roll-up” plea here is based upon the “facts” stated in the article and upon some other facts “stated in the said newspaper or referred to explicitly or implicitly in the said article”. It is left to the plaintiff to work out which statements are facts and which are opinions. In addition, after working his way through the very general allegations against him in the article, he has the task of determining what other things said in the newspaper at some other unstated time are implicitly referred to in the article. Any of these things, the defendants say they are entitled to bring forth in the examination for discovery and later at the trial of the action. I cannot believe our system of pleading permits the parties to proceed through the trial process on any such ill-defined issues.