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Re: [Caml-list] Polymorphic Variants and Number Parameterized Typ es
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Date: 2002-04-29 (13:36)
From: Krishnaswami, Neel <neelk@c...>
Subject: Re: [Caml-list] Polymorphic Variants and Number Parameterized Typ es
Pascal Cuoq [mailto:pascal.cuoq@inria.fr] wrote:
> Neel Krishnaswami wrote:
> > There's no recursion in the module system because that would break
> > the termination guarantee. If you think of modules as records, and
> > functors as lambda abstractions, you can see that the module system
> > defines a simply-typed lambda calculus. As you've noticed with C++, 
> > adding recursion to it would mean you can write nonterminating module
> > expressions. (All this is wonderfully clearly explained in 
> > the paper, "A modular  module system".)
> I'm not sure about "simply-typed". Did the situation change since
> that of http://caml.inria.fr/archives/199907/msg00027.html ?

Wow! I didn't even know that was possible. I thought that typechecking
record subtyping was decidable...?

Neel Krishnaswami
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