/* % % PFC is a language extension for prolog.. there is so much that can be done in this language extension to Prolog % % Dec 13, 2035 % Douglas Miles */ :- module(sanity_neg,[]). :- ensure_loaded(system:library(logicmoo_utils)). b:-c. c:-loop_check(a,true). a:-b. a:-loop_check(a,fail). d:-loop_check(a,fail). d:-dmsg(d). :- listing(d). ?- d.