[Jed-users-l] slang function debugging?

[Ulli Horlacher <framstag@xxxxxxxxxxxxxxxxxxxx>]

How can one debug an error in a slang function?

I have substituted make_backup_filename() (from site.sl) with my own
version:

define make_backup_filename(dir,file) {
  variable f = dir + "/" + file;
  f = str_quote_string(f,"\"'`[](){}<>|;&$*? \t",'\\');
  system(sprintf("vv -s %s >/dev/null",f));
  return "";
}

(vv is my versioning program)

It works well when I edit just one file, but when I edit more files and
change their buffers, I get on exit :

Unable to typecast Integer_Type to String_Type

and jed continues to run.

A second exit then is successfull. 

The error must be in the new make_backup_filename(), because it disapears
when I use

define make_backup_filename(dir,file) {
  return "";
}


How can I debug it?
At least I need a line number where the error happens.

-- 
Ullrich Horlacher              Informationssysteme und Serverbetrieb
Rechenzentrum IZUS/TIK         E-Mail: horlacher@xxxxxxxxxxxxxxxxxxxx
Universitaet Stuttgart         Tel:    ++49-711-68565868
Allmandring 30a                Fax:    ++49-711-682357
70550 Stuttgart (Germany)      WWW:    http://www.tik.uni-stuttgart.de/
REF: <20130604080354.GA20268@xxxxxxxxxxxxxxxxxxxx>
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