To: Damien Doligez <Damien.Doligez@inria.fr>
Subject: Re: Why is this not allowed?
From: John Prevost <email@example.com>
Date: 02 Dec 1999 13:40:44 -0500
In-Reply-To: Damien Doligez's message of "Thu, 2 Dec 1999 12:13:32 +0100"
Damien Doligez <Damien.Doligez@inria.fr> writes:
> ># let rec id'' = id;;
> >This kind of expression is not allowed as right-hand side of `let rec'
> Because we don't know how to compile "let rec x = x" or
> let rec x = y
> and y = x
> Moreover, you can just remove the "rec" and it works. It is possible
> to implement "let rec var1 = var2", but the usefulness is quite small
> compared to the amount of code we would need to write.
Well, you can't quite. Because of the value restriction, id'' defined
let id'' = id;;
id'' : '_a -> '_a
(That is, it'll only work for a single type.)
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