Jay McCarthy 3ddaf5e32b Fixing Racklog cut error found by Erik Dominikus ... Basically, Racklog (and all versions of schelog) implement ! by causing the failure continuation of the entire relation being returned. They did not also cause the unification caused by the relation to be un-done. However, it is not easy to separate un-doing the local changes because the unification just returns a failure continuation too. I had to call that fail continuation but use state to communicate to its target that the next clause should not be visited. I don't know if this is correct. My test suite contains a lot of cut tests that still pass. Erik's test passes too. But I'm not confident that this really works.		2012-08-14 21:34:02 -06:00
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pr-ed.rkt	Fixing Racklog cut error found by Erik Dominikus	2012-08-14 21:34:02 -06:00
pr12085.rkt