I guess you can finally cross that one off of your bucket list. I know it has been there for a very long time. :grinning: However, what if the predicate has more than one choice point, wouldn’t the answer be a list?

It prints only the last choice point left (if any) in the current environment: From SWI-Prolog -- Manual Unify Choice with an integer provided a reference to the last choice point. Fails if the current environment has no choice points. See also prolog_choice_attribute/3 .

Print last choice point - Reply 1 - #2 by EricGT - General

Topic		Replies	Views	Activity
Print last choice point Useful Code	0	733	December 6, 2021
Print last choice point - Reply 2 General	0	410	December 6, 2021
Print last choice point - Reply 3 General	14	1376	July 12, 2022
Confused about choice points Help!	6	765	August 9, 2023
Choice points with lists Help!	4	105	April 26, 2025