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From: Oleg <oleg_inconnu@myrealbox.com>
To: caml-list@inria.fr
Subject: [Caml-list] Cyclic ?!
Date: Wed, 14 Aug 2002 22:19:48 -0400	[thread overview]
Message-ID: <200208150218.WAA22018@hickory.cc.columbia.edu> (raw)

Hi

I'm puzzled by the following compiler behavior:

If I define bin_tree as

type 'a bin_tree = 
           Empty
         | Node of 'a bin_tree * 'a * 'a bin_tree

the compiler accepts it. OTOH if I define it as

type 'a bin_tree = ('a bin_tree * 'a * 'a bin_tree) option

It gives an error: "The type abbreviation bin_tree is cyclic".
Why??? And what's the difference between the two, really?

Thanks
Oleg
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             reply	other threads:[~2002-08-15  2:18 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-08-15  2:19 Oleg [this message]
2002-08-15 14:31 ` Michael Hicks
2002-08-15 17:26   ` Oleg
2002-08-15 18:05     ` Markus Mottl
2002-08-15 18:16       ` Brian Smith
2002-09-24 16:23     ` [Caml-list] Recursive types (Was Cyclic ?!) Christophe Raffalli
2002-08-18 16:13 ` [Caml-list] Cyclic ?! John Max Skaller

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