> > There a little problem when you try to compute
> >
> > > let e = parse "1*3-2";;
> >
> >
> > I get :
> >
> > >  val e : expr = Times (Value "1", Value "3")
>
> This is a Genlex limitation. "-2" is recognized as an integer
> constant. Thus you need to add extra space:
>
> ======================================================================
> # parse "1*3 - 2";;
> - : expr = Minus (Times (Value "1", Value "3"), Value "2")
> ======================================================================


ok

> I also didn't understand why there is this in "term" :
> >
> > >    | _ -> f
> > >    | _ -> failwith "syntax error"
>
> Simply because I wrote this code in a rush :-) Forget about the last
> line.


I thought it was something obscur behind these two lines :)
thanks for the quick answer

-- 
Mehdi Dogguy
مهدي الدڤي