[plt-scheme] Debugging in drscheme

From: Jos Koot (jos.koot at telefonica.net)
Date: Sun Feb 22 19:17:56 EST 2009

It seems that the problem reported in 
http://bugs.plt-scheme.org/query/?cmd=view&pr=10068 is more general.

----- Original Message ----- 
From: <y1wm6lg02 at sneakemail.com>
To: <plt-scheme at list.cs.brown.edu>
Sent: Monday, February 23, 2009 1:05 AM
Subject: [plt-scheme] Debugging in drscheme

> (Just posted in comp.lang.scheme)
> Vista 64, PLT-scheme 4.1.3
> I'm having trouble debugging in drscheme.  Perhaps someone can point
> me in the right direction. I'm unable to find a single, clear, "here is
> what you do" description in any of the numerous bits of documentation.
> Almost too much documentation with many links everywhere else makes it
> hard to keep a good snapshot in my head.
> The trouble lies in the first few lines:
> #lang scheme
> (require srfi/1) ;for list stuff
> (require srfi/27) ;for randomness
> This works with mzscheme.exe interpreter, and in works the same if I
> click "run" from the DrScheme gui environment.
> However if I click "debug" from the DrScheme env. I get the following
> error: expr-syntax-object-iterator: unknown expr: (#%variable-
> reference)
> If  I comment out the line (require srfi/1), then both drscheme env.
> and mzscheme.exe run until it encounters the "delete" (list
> manipulation) procedure from srfi 1 later on in the code.
> I tried changing delete to use the remove procedure, but then that
> uncovered other things that aren't in scheme/base (such as list-index
> I think, and possibly other stuff, used elsewhere in code).  I suppose
> there is a reason the list manipulation stuff shows up in the first
> srfi...
> If I change the first line to #lang r5rs, both drscheme and mzscheme
> complain about "require".  Other errors happen when I try selecting
> various languages r5rs, pretty big, teaching edditions, etc.
> Anyway, I'm guessing there is a simple knob to tweak someplace in
> drscheme which will enable the correct debugging of my code, while
> also allowing me to use srfi/1 in both drscheme and mzscheme.  Can
> someone please help me out?
> thank you very much
> michael
> _________________________________________________
>  For list-related administrative tasks:
>  http://list.cs.brown.edu/mailman/listinfo/plt-scheme 

Posted on the users mailing list.