From: Jeremy Yallop <jeremy.yallop@ed.ac.uk>
To: skaller <skaller@users.sourceforge.net>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] pm variant type question
Date: Fri, 24 Aug 2007 11:14:14 +0100 [thread overview]
Message-ID: <46CEAF76.20006@ed.ac.uk> (raw)
In-Reply-To: <1187931704.7202.9.camel@rosella.wigram>
skaller wrote:
> type 'a regexp_t' =
> [
> | `REGEXP_seq of 'a regexp_t' * 'a regexp_t' (** concatenation *)
> | `REGEXP_alt of 'a regexp_t' * 'a regexp_t' (** alternation *)
> | `REGEXP_aster of 'a regexp_t' (** Kleene closure *)
> | `REGEXP_string of string (** concatenation of chars of string *)
> | `REGEXP_epsilon (** epsilon: null string *)
> ]
If I understand rightly, then this should be
type 'a regexp_t' =
[
| `REGEXP_seq of 'a * 'a (** concatenation *)
| `REGEXP_alt of 'a * 'a (** alternation *)
| `REGEXP_aster of 'a (** Kleene closure *)
| `REGEXP_string of string (** concatenation of chars of string *)
| `REGEXP_epsilon (** epsilon: null string *)
]
The version you gave will result in an xreg_t type that doesn't allow
things like
`REGEXP_alt (`REGEXP_code x, `REGEXP_code x)
(In fact, in your version, the 'a parameter is never actually used.)
Jeremy.
next prev parent reply other threads:[~2007-08-24 10:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-24 5:01 skaller
2007-08-24 10:14 ` Jeremy Yallop [this message]
2007-08-24 10:23 ` [Caml-list] " skaller
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