[plt-scheme] MzScheme as embedded engine for LilyPond ?

eli at barzilay.org writes:
> > > >     lilypond --debug foo.ly
> > > > 
> > > >   would use the MzScheme with locations, and 
> > > > 
> > > >     lilypond foo.ly
> > > >  
> > > >   would use the non-debugging version.  Is this possible at all?
> > > 
> > > mzscheme -M errortrace
> > 
> > This produces line/column numbers, but no stacktrace, for the above
> > example, I now get 
> > 
> > 	byrd:~/usr/src/lilypond$ mzscheme -M errortrace -f b.scm
> > 	Welcome to MzScheme version 209, Copyright (c) 2004 PLT Scheme, Inc.
> > 	procedure application: expected procedure, given: 0 (no arguments)
> > 	/home/hanwen/usr/src/savannah/lily/lilypond/b.scm:3:2: (a)
> 
> My guess is that you have some simple code like:
> 
>   (define (foo x)
>     (x))
>   (define (bar x)
>     (if (< x 1)
>       (foo 1)
>       (foo 2)))
>   (bar 0)

yup.

> and the failure is at a point where there is no stack to show, since
> all calls are tail calls.

Good point. Apparently, GUILE is not fully compliant in its --debug
mode.


-- 

 Han-Wen Nienhuys   |   hanwen at xs4all.nl   |   http://www.xs4all.nl/~hanwen