Hi all - How does (current-directory) actually work, specifically in Dr Scheme REPL?  I am trying to dynamically determine module's provided variables based on Eli's code in <a href="http://list.cs.brown.edu/pipermail/plt-scheme/2003-November/003698.html"> http://list.cs.brown.edu/pipermail/plt-scheme/2003-November/003698.html</a>.  It works if the module path happens to be the current directory, but fails if not, for modules that require another module "relatively". Example: ; c:\data\scheme\lib\util\foo.scm (module foo mzscheme   (define x 1)   (provide (all-defined))) ; c:\data\scheme\lib\util\util.scm (module util mzscheme   (require "foo.scm ")   (define y 2)   (provide (all-from "foo.scm"))   (provide (all-defined))) Dr Scheme REPL > (current-directory) #<path:C:\Local\PLT> > (parameterize ((current-directory "c:\\data\\scheme\\lib\\util\\"))     (expand (with-input-from-file "c:\\data\\scheme\\lib\\util\\util.scm" read))) Error: open-input-file: cannot open input file: "c:\Local\PLT\foo.scm" (The system cannot find file specified.; errno=2) This behavior is the same even when I attempt to modify REPL current-directory first then expand the file.  When I verify (current-directory) it is indeed modified, but expand just simply doesn't work from the changed directory - this is puzzling (I have also previously run into another similar situation with a different function that I forgot, so I don't think this is specifically due to (expand)). > (current-directory "c:\\data\\scheme\\lib\\util\\") > (current-directory) #<path:c:\data\scheme\lib\util> > (expand (with-input-from-file "c:\\data\\scheme\\lib\\util\\util.scm" read)) Error: open-input-file: cannot open input file: "c:\Local\PLT\foo.scm" (The system cannot find file specified.; errno=2) How can I actually change the current-directory? Thanks, yinso -- <a href="http://www.yinsochen.com">http://www.yinsochen.com</a> ...continuous learning...