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Re: [Bug-mit-scheme] [bug #36429] Compiler mysteriously runs out of stac

From: Alexey Radul
Subject: Re: [Bug-mit-scheme] [bug #36429] Compiler mysteriously runs out of stack space
Date: Wed, 11 Jul 2012 10:58:30 -0400

This bug is not impeding me in any way, so I leave the question of
fixing it entirely to your discretion.  But thanks for finding out
what it was :)


On Wed, Jul 11, 2012 at 1:05 AM, Taylor R Campbell <address@hidden> wrote:
>    Date: Mon, 07 May 2012 21:21:02 +0000
>    From: Alexey Radul <address@hidden>
>    Now, the enclosed file does contain a mistake: one of the procedures
>    defined therein always recursively calls itself (and even not in
>    tail position).  However, my attempts to produce a small example
>    using this to cause the compiler to run out of stack failed.  I also
>    got very confused when I tried to reduce the present example,
>    because commenting out a form I would not have expected to have
>    anything to do with anything caused the misbehavior to disappear.
> Hitting C-c C-b at exactly the right moment reveals that the compiler
> is deep into recursively generating debug data for an environment
> hierarchy that an earlier pass has decided to put a cycle into.  (Some
> hierarchy!)
> As for how the cycle got there in the first place, well, have you read
> the comment at the top of closan.scm?
> I'm not sure it's worthwhile to spend many more brain cycles fixing
> these bugs in LIAR, though; the code is too highly interrelated to
> reason clearly about it or automatically any parts of it in isolation.

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