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From: Wolfgang Lux <wlux@uni-muenster.de>
To: Vincenzo Ciancia <vincenzo_yahoo_addressguard-gmane@yahoo.it>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Re: type t = ()
Date: Fri, 10 Jun 2005 14:56:34 +0200	[thread overview]
Message-ID: <cd188d68860e0385c413d068099a34a8@uni-muenster.de> (raw)
In-Reply-To: <d8ae6e$gi5$1@sea.gmane.org>

Vincenzo Ciancia wrote:

> Richard Jones wrote:
>
>> # type dummy = ();;
>> type dummy = ()
>> # let () = Printf.printf "hello";;
>> This expression has type unit but is here used with type dummy
>>
>
> It seems that the compiler accepted "()" as a type constructor, so now 
> every
> instance of "()" is the only constructor of type "dummy" e.g.

Sorry for nitpicking, but in this case () is a *data* constructor.
I guess, Rich would have been more happy if OCaml did recognize ()
as a type constructor in this example.

However, I guess one cannot do much about this in OCaml since () is
a legitimate data constructor name. The problem really is that the
(O)Caml designers chose to overload the type keyword for defining
algebraic data types as well as type abbreviations. Compare with SML
and Haskell where different keywords are used.

Regards
Wolfgang


  reply	other threads:[~2005-06-10 12:56 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-06-09 21:22 Richard Jones
2005-06-09 22:05 ` Vincenzo Ciancia
2005-06-10 12:56   ` Wolfgang Lux [this message]
2005-06-09 23:43 ` [Caml-list] " Jonathan Bryant
2005-06-10  7:55   ` Richard Jones
2005-06-10 13:02     ` Florian Hars
2005-06-10 22:12       ` Jon Harrop

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