[plt-scheme] draw.ss - (lib "draw-sig.ss" "htdp") appears in red

At Thu, 14 Dec 2006 16:38:46 +0100, Jens Axel Søgaard wrote:
> Geoffrey S. Knauth skrev:
> > I was looking at this code in htdp/draw.ss using DrScheme:
> > 
> > 1 #cs(module draw mzscheme
> > 2   (require (lib "big-draw.ss" "htdp")
> > 3            (lib "draw-sig.ss" "htdp")
> > 4            (lib "unitsig.ss"))
> > 
> > All of line 3 is in red, but the file exists and the module browser sees 
> > draw-sig.ss.  I'm using v360 on Mac OS X.  My setup is conventional, 
> > except for the object-debugger I installed prematurely the other day, 
> > which requires v369 > v360.  Since that day, I see this boot message:
> > 
> > Users/gknauth/Library/PLT 
> > Scheme/planet/300/360/cache/plt/object-debugger.plt/1/0/tool.ss:15:14: 
> > unit: exported variable is not defined at: drscheme:tool-exports^ in: 
> > (unit (import drscheme:tool^) (export drscheme:tool-exports^) (define 
> > sequence-trace-language% (c...
> 
> Haven't got a clue about that.
> 
> > Is that why line 3 above was red, or is it something else?
> 
> If you import a module, but uses none of its exports, it is
> colored red. Maybe that's why?

That's part of it. That, plus a long-standing bug that when the only
exports used are signatures, check syntax doesn't detect the use of the
signatures and colors the require red.

Robby