From: John Skaller <skaller@users.sourceforge.net>
To: Alex Baretta <alex@barettadeit.com>
Cc: Ocaml <caml-list@inria.fr>
Subject: Re: [Caml-list] Limitations on $n in ocamlyacc?
Date: Fri, 27 May 2005 22:28:28 +1000 [thread overview]
Message-ID: <1117196908.7207.26.camel@localhost.localdomain> (raw)
In-Reply-To: <4296D938.30901@barettadeit.com>
On Fri, 2005-05-27 at 10:24 +0200, Alex Baretta wrote:
> What is the limit on the number of token values accessible with the $n
> notation in ocamlyacc semantic actions? I'm asking because I'm
> consistently getting ocamlyacc errors like the following, which I can't
> make sense of.
>
> ocamlyacc: e - line 96 of "xcaml_dictionary_yacc.mly", $5 is unbound
This is because the symbol has no argument:
%token FRED
p: FRED { $1 }
will give this error, but
%token<int> JOE
q: JOE { $1 }
makes non-terminal q of type int, the type of JOE's argument.
It is equivalent to:
type token =
| FRED
| JOE of int
then
match (x:token) with
| FRED ?a -> .. (* ERROR -- FRED is a constant constructor *)
| JOE ?a -> .. (* OK -- JOE is a nonconstant constructor *)
--
John Skaller, skaller at users.sf.net
PO Box 401 Glebe, NSW 2037, Australia Ph:61-2-96600850
Download Felix here: http://felix.sf.net
prev parent reply other threads:[~2005-05-27 12:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-27 8:24 Alex Baretta
2005-05-27 9:02 ` [Caml-list] " Alex Baretta
2005-05-27 12:28 ` John Skaller [this message]
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