<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.6000.16674" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face="Courier New" size=2>It works for me though:</FONT></DIV> <DIV><FONT face="Courier New" size=2></FONT> </DIV> <DIV><FONT face="Courier New" size=2>#lang scheme</FONT></DIV> <DIV> </DIV> <DIV><FONT face="Courier New" size=2>(define-syntax x<BR> (syntax-rules ()<BR>  ((_ 1 _) 'one)<BR>  ((_ _ 2) 'two)))</FONT></DIV> <DIV> </DIV> <DIV><FONT face="Courier New" size=2>(x 1 monkey) ; one<BR>(x monkey 2) ; two</FONT></DIV> <DIV><FONT face="Courier New" size=2></FONT> </DIV> <DIV><FONT face="Courier New" size=2>Welcome to DrScheme, version 4.0.0.1-svn16jun2008 [3m].<BR>Language: Module.</FONT></DIV> <DIV><FONT face="Courier New" size=2></FONT> </DIV> <DIV><FONT face="Courier New" size=2>Jos</FONT></DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=yinso.chen@gmail.com href="mailto:yinso.chen@gmail.com">YC</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=plt-scheme@list.cs.brown.edu href="mailto:plt-scheme@list.cs.brown.edu">pltscheme</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, June 24, 2008 12:32 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> [plt-scheme] (v4) wildcard not allowed in expression</DIV> <DIV><BR></DIV>Hi - <BR><BR>It seems that in v4 `_` can no longer exist in the expression position for syntax-case, is there a reason for the change? <BR><BR>Thanks,<BR>yc<BR><BR> <P> <HR> <P></P>_________________________________________________<BR>  For list-related administrative tasks:<BR>  <A href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme">http://list.cs.brown.edu/mailman/listinfo/plt-scheme</A><BR></BLOCKQUOTE></BODY></HTML>