From rjs at fdy2.demon.co.uk  Wed May 12 16:46:33 2010
From: rjs at fdy2.demon.co.uk (rjs at fdy2.demon.co.uk)
Date: Wed, 12 May 2010 17:46:33 +0100 (BST)
Subject: [movitz-devel] loop
Message-ID: <20100512164633.D8B2E762A@fdy2.demon.co.uk>


The LOOP macro doesn't seem to create a NIL block.

I'm trying to add some code from CMUCL to Movitz that expects to be
able to (RETURN NIL) from within a LOOP.

I have tried comparing loop.lisp with the equivalents in CMUCL and
SBCL but can't see what is causing the problem.

Robert Swindells



From frode at netfonds.no  Fri May 14 07:09:57 2010
From: frode at netfonds.no (Frode V. Fjeld)
Date: Fri, 14 May 2010 09:09:57 +0200
Subject: [movitz-devel] loop
References: <20100512164633.D8B2E762A@fdy2.demon.co.uk>
Message-ID: <82ocgjvu0q.fsf@netfonds.no>

<rjs at fdy2.demon.co.uk> writes:

> The LOOP macro doesn't seem to create a NIL block.

The macro-expander for LOOP is copied pretty much verbatim from some
other implementation (perhaps CMUCL), so I'd be surprised if there's an
obvious problem like that. I'll have a look at it this evening,
hopefully.

-- 
Frode V. Fjeld





From rjs at fdy2.demon.co.uk  Fri May 14 09:38:42 2010
From: rjs at fdy2.demon.co.uk (rjs at fdy2.demon.co.uk)
Date: Fri, 14 May 2010 10:38:42 +0100 (BST)
Subject: [movitz-devel] loop
In-Reply-To: <82ocgjvu0q.fsf@netfonds.no> (frode@netfonds.no)
Message-ID: <20100514093842.AB9C176A0@fdy2.demon.co.uk>


frode at netfonds.no wrote:
><rjs at fdy2.demon.co.uk> writes:
>
>> The LOOP macro doesn't seem to create a NIL block.
>
>The macro-expander for LOOP is copied pretty much verbatim from some
>other implementation (perhaps CMUCL), so I'd be surprised if there's an
>obvious problem like that. I'll have a look at it this evening,
>hopefully.

This feature was only added to the CMUCL version in 2008, I have tried
adding the same changes to the Movitz version but it still doesn't
work.

The code for LOOP is nearly the same in CMUCL, SBCL and CCL but there
are slight differences in each.

Robert Swindells