<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD><TITLE></TITLE> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2900.2802" name=GENERATOR></HEAD> <BODY> Hello If you try the following code, it seems that the macro sees the list (1 3) in both case but fails to match. In both case x should be the list (1 3) and not (quote (1 3)). I don't understand why. I guess the answer is simple but I can't find it after a few hours. Thank you (define-syntax testListe   (syntax-rules ()     [(_ (1 3)) #t]     [(_ xxx)      (begin        (display xxx)        (newline)        #f)])) (let ((x (list 1 3)))   (testListe  x)) => (1 3) => #f (define x '(1 3)) (testListe x) => (1 3) => #f -----Message d'origine----- De : plt-scheme-bounces@list.cs.brown.edu [<A href="mailto:plt-scheme-bounces@list.cs.brown.edu">mailto:plt-scheme-bounces@list.cs.brown.edu</A>] De la part de Chongkai Zhu Envoyé : 19 janvier, 2006 00:30 À : plt-scheme Objet : Re: [plt-scheme] Problem with define-syntax ======= At 2006-01-18, 19:57:10 Andre Mayers wrote: ======= >Good day > >I miss something which is surely basic. >How can I define a macro that will match a list ? >Why the following is not working ? > >(define-syntax testListe >  (syntax-rules () >    [(_ (1 3)) #t] >    [(_ xxx) #f])) > > >(define x '(1 3)) >(testListe  x) > >Thank you > >Andre Mayers, Ph.D., professeur  |  tel: 819-821-8000x2041 >Departement d'informatique       |  fax: 819-821-8200 >Universite de Sherbrooke         |  andre.mayers@usherbrooke.ca >Sherbrooke (Quebec)              |  <A href="http://www.dmi.usherb.ca/~amayers">http://www.dmi.usherb.ca/~amayers</A> >Canada J1K 2R1 > You are trying to match (quote (1 3)) with (1 3). > (testListe (1 3)) #t - Chongkai _________________________________________________   For list-related administrative tasks:   <A href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme">http://list.cs.brown.edu/mailman/listinfo/plt-scheme</A> </BODY></HTML>