From: Marc Lasson <titmarc@free.fr>

> I am very interested in your OO syntax extension but i did not succeed 
> to compile it.
> I get the following error:
> 
> marc@georgie:~$ ocamlc -I +camlp4 -c -pp 'camlp4o pa_extend.cmo 
> q_MLast.cmo' pa_oo.ml
> File "pa_oo.ml", line 12, characters -249--249:
> Unbound value loc
> 
> The error's position looks very weird. Since i can't speak camlp4, i'm 
> unable to fix it.
> Is it serious doctor ?
> 
> marc@georgie:~$ ocamlc -v && camlp4o -v
> The Objective Caml compiler, version 3.08.2
> Standard library directory: /usr/lib/ocaml/3.08
> Camlp4 version 3.08.2

Simplest fix: upgrade to 3.08.3.
"loc" was changed to "_loc" between 3.08.2 and 3.08.3.
You can also replace all occurrences of "_loc" in the source by "loc".

Jacques Garrigue