This is a bug that's already been reported to caml-bugs, and the list,
though I haven't seen any response to it.  Basically, camlp4o.opt is a
dud --- it always returns nothing, so anything you compile with it
comes out doing nothing.  camlp4o works as usual, though.

On Tue, 20 Jul 2004 13:08:05 +0200, Nicolas Cannasse <warplayer@free.fr> wrote:
> > [This is with OCaml 3.07 - not checked with 3.08]
> >
> > --------------------------------------------------------- pptest.ml --
> > let f = fun (year, week) as yw -> 1
> > ----------------------------------------------------------------------
> >
> > $ ocamlc -c pptest.ml
> > File "pptest.ml", line 1, characters 25-27:
> > Syntax error
> >
> > But ...
> >
> > $ ocamlc -pp "camlp4o" -c pptest.ml
> > $
> >
> > Rich.
> 
> Yesterday I reported a bug to the OCaml Team :
> The following :
> 
> SomeUnknownModule.f()
> 
> is successfully compiled when using camlp4o.opt.exe under Win32 MSVC.
> Looks like an empty syntax tree is returned when some error is raised.
> It might be the same problem, try to shift to camlp4 bytecode built in order
> to fix this.
> 
> Regards,
> Nicolas Cannasse
> 
> 
> 
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