Re: GNU Prolog crash
Paulo Moura <[email protected]> Tue, 23 Nov 2010 16:23:37 +0000
| Newsgroups | gmane.comp.gnu.prolog.bugs |
|---|---|
| Message-ID | <[email protected]> |
On 2010/11/21, at 16:14, Idelmar Mader wrote: > Linux jabberwocky 2.6.32-25-generic #45-Ubuntu SMP Sat Oct 16 19:48:22 UTC 2010 i686 GNU/Linux > > Prolog top-Level (GNU Prolog) 1.3.0 > > > Crash when: > > A = 1. > A = A + 1. > > ------------------------------------------------------------------------------------------------------------------------------------------------------- > > | ?- A = 1. > > A = 1 > > yes > | ?- A = A + 1. > Falha de segmentação I.e. Segmentation fault. The goal above creates a rational/infinite term, which is not supported (I believe) in GNU Prolog (which is not alone in this regard). You can prevent accidental attempts to create a rational term using the standard predicate unify_with_occurs_check/2: | ?- unify_with_occurs_check(A, A+1). no Cheers, Paulo ----------------------------------------------------------------- Paulo Jorge Lopes de Moura, PhD Assistant Professor Dep. of Computer Science, University of Beira Interior 6201-001 Covilhã, Portugal Office 3.18 Ext. 3276 Phone: +351 275319891 Fax: +351 275319899 Email: <mailto:[email protected]> Home page: <http://www.di.ubi.pt/~pmoura> Research: <http://logtalk.org/> Blog: <http://blog.logtalk.org/> -----------------------------------------------------------------