Excerpts from Sylvain Le Gall's message of Wed Jan 30 10:53:34 +0100 2008:
> On 30-01-2008, Berke Durak <berke.durak@exalead.com> wrote:
> > Sylvain Le Gall a écrit :
[...]
> > When you develop a program P you will have use programs P_{i1}, P_{i2}, 
> > ... and thus have checkouts of repositories S_{i1}, S_{i2}, and so on. 
> > If you find a bug in P_{i1} you can directly edit the checked out 
> > version, recompile everything automatically by launching ocaml in P's 
> > directory and thus debug P_{i1}.  You can then locally commit your 
> > changes to P_{i1} and then easily push the patch or send the diff to the 
> > upstream author.
> >
> 
> Send a patch to author of P_{i1}. This is the easiest way. 
> 
> <hint>
> diff -Nurd  P_{i1} P_{i1}.new
> </hint>

And  what  if the author of P_{i1} have changed it's project (locally or not),
let's  say  some  file  renamings,  adding  some  code around the bug, do some
global replacing...

With such a diff file you end-up with a patch that is not applicable.

That's not a problem when using darcs!

-- 
Nicolas Pouillard aka Ertai