From: John Max Skaller <skaller@maxtal.com.au>
To: Hendrik Tews <tews@tcs.inf.tu-dresden.de>
Cc: Caml-list <caml-list@inria.fr>
Subject: Re: empty type (was [Caml-list] Please help a newbie)
Date: Wed, 08 Aug 2001 03:32:25 +1000 [thread overview]
Message-ID: <3B702629.52BEDCBC@maxtal.com.au> (raw)
In-Reply-To: <15214.27431.174543.115555@gargle.gargle.HOWL>
Hendrik Tews wrote:
> It is my contention that the type of procedures is wrong
> in ocaml precisely because they return unit, when they
> _should_ be returning void (that is, nothing).
>
> So what typing rules do you use for the empty type? Usually a
> type theory is inconsistent as soon as one has an inhabitant of
> the empty type.
Felix has statements and expressions. The typing
rule is:
f:T -> void, a:T
|- f a: void
Note that 'f a' cannot occur inside an expression, indeed,
it isn't an expression but a statement.
--
John (Max) Skaller, mailto:skaller@maxtal.com.au
10/1 Toxteth Rd Glebe NSW 2037 Australia voice: 61-2-9660-0850
New generation programming language Felix http://felix.sourceforge.net
Literate Programming tool Interscript
http://Interscript.sourceforge.net
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prev parent reply other threads:[~2001-08-07 17:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-03 10:58 Johann Spies
2001-08-03 13:26 ` [Caml-list] Re: your mail Francois Pottier
2001-08-03 17:42 ` Vitaly Lugovsky
2001-08-03 18:23 ` [Caml-list] Please help a newbie md5i
2001-08-05 21:37 ` John Max Skaller
2001-08-06 10:02 ` empty type (was [Caml-list] Please help a newbie) Hendrik Tews
2001-08-07 17:32 ` John Max Skaller [this message]
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