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cyclic types
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Date: 2005-01-30 (06:05)
From: Radu Grigore <radugrigore@g...>
Subject: Re: [Caml-list] cyclic types
On Sun, 30 Jan 2005 00:47:23 +0100, Damien Doligez
<damien.doligez@inria.fr> wrote:

> IIRC, rectypes are off by default because they trade a small increment
> in expressive power for a large degradation of the intelligibility of
> type-checking error messages.  I don't think they are dangerous in the
> sense of breaking the type system.

Thank you.

Only one (small) problem remains. I do not understand this:

# type t = t StringMap.t option;;
The type abbreviation t is cyclic
# type t = Some of t StringMap.t | None;;
type t = Some of t StringMap.t | None