Push-back lists on DCG rule heads

Found this really old SWI-Prolog forum post (20 years ago) that had some useful information.


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Ah, those confusing push-back lists! Here’s another archived post from 12 years ago where the first poster is really, really confused and completely out of her depth:


(12 years ago! Bloody hell, time flies. Btw, where are Richard O’Keefe, Samer Abdallah and Feliks Kuzniak?)