<!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 6.00.6000.16640" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Has been solved.</FONT></DIV> <DIV><FONT face=Arial size=2>With thanks to Matthew Flatt (and PLT in general)</FONT></DIV> <DIV><FONT face=Arial size=2>See <FONT face="Times New Roman" size=3>  </FONT><A href="http://bugs.plt-scheme.org/query/?cmd=view&pr=9466"><FONT face="Times New Roman" size=3>http://bugs.plt-scheme.org/query/?cmd=view&pr=9466</FONT></A></FONT></DIV> <DIV><FONT face=Arial 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=deinst@gmail.com href="mailto:deinst@gmail.com">David Einstein</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">PLT Scheme Mailing List</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, June 08, 2008 10:25 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> [plt-scheme] How do optional parameters work</DIV> <DIV><BR></DIV>If I enter the following module into DrScheme, version 3.99.0.26-svn6jun2008 (self compiled on a ubuntu zmd64 (module language)<BR><BR>#lang scheme<BR>(provide foo)<BR>(define (foo a #:optional (b #f)) #t)<BR><BR>and hit check syntax <BR><BR>I get an internal error<BR><BR>path->complete-path: expects argument of type <path (for any platform) or string>; given |expanded module|<BR><BR>and Dr scheme is in a confused state  with nothing showing up in the definitions window  (it does not want to look at my code, and so it assumes that I don't either)<BR><BR>I'm not sure whether I am screwed up, or this is a bug.  Probably both.<BR> <P> <HR> <P></P>_________________________________________________<BR>  For list-related administrative tasks:<BR>  http://list.cs.brown.edu/mailman/listinfo/plt-scheme<BR></BLOCKQUOTE></BODY></HTML>