The Racket repository
3ddaf5e32b
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. |
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The Racket programming language =============================== Important executables: * DrRacket: Racket's integrated development environment (start here!). * Racket: the main command-line entry point for running racket programs and scripts. * GRacket: the GUI-mode Racket executable. * raco: Racket's command-line toolset. More Information ---------------- Racket comes with extensive documentation: use DrRacket's `Help' menu, or run `raco docs'. Also, visit us at http://racket-lang.org/ for more Racket resources. Instructions for building Racket from source are in src/README. License ------- Racket Copyright (c) 2010-2012 PLT Scheme Inc. Racket is distributed under the GNU Lesser General Public License (LGPL). This means that you can link Racket into proprietary applications, provided you follow the rules stated in the LGPL. You can also modify Racket; if you distribute a modified version, you must distribute it under the terms of the LGPL, which in particular means that you must release the source code for the modified software. See doc/release-notes/COPYING.txt for more information.