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Message from discussion Total Functional Programming in Haskell
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David Menendez  
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 More options Oct 2 2008, 2:20 pm
Newsgroups: fa.haskell
From: "David Menendez" <d...@zednenem.com>
Date: Thu, 02 Oct 2008 18:20:50 UTC
Local: Thurs, Oct 2 2008 2:20 pm
Subject: Re: [Haskell-cafe] Re: Total Functional Programming in Haskell
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On Wed, Oct 1, 2008 at 7:53 PM, wren ng thornton <w...@freegeek.org> wrote:

> [1] Just like existential types, you can put something in but you can never
> get it back out again. For inescapable monads like IO and ST, this is why
> they have the behavior of sucking your whole program into the existential
> black-hole.

That's true for IO, but the whole point of ST is that it *is*
escapable. What makes ST (and IO and STM) unusual is that it can't be
implemented in pure Haskell without special support from the run-time
system.
--
Dave Menendez <d...@zednenem.com>
<http://www.eyrie.org/~zednenem/>
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