From: Alex Vong <alexvong1995@gmail.com>
To: Christopher Howard <ch.howard@zoho.com>
Cc: Guile User Mailing List <guile-user@gnu.org>
Subject: Re: underscores in debug output?
Date: Wed, 30 Aug 2017 22:46:42 +0800 [thread overview]
Message-ID: <87bmmxun8t.fsf@gmail.com> (raw)
In-Reply-To: <1504065406.20412.1.camel@zoho.com> (Christopher Howard's message of "Tue, 29 Aug 2017 19:56:46 -0800")
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Christopher Howard <ch.howard@zoho.com> writes:
> Hi, what does the underscore character mean in this debug output?
>
> 159:37 5 (delete ((3 . "c") (((2 . "b") (()) 1) (5 . "e") (()) 1)
> 2) 2)
> 163:49 4 (delete ((2 . "b") (()) 1) _)
> 152:9 3 (delete _ _)
> 86:11 2 (skew _)
> 64:6 1 (horizontal-left-link? _)
> 46:11 0 (left-tree _)
>
> Knowing the value of those parameters would be super helpful here, but
> for some reason they have been replaced by underscores.
My guess would be that those values are being garbage-collected. Since _
is the pattern for matching an arbitary value, it is used to denote a
garbage-collected value.
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next prev parent reply other threads:[~2017-08-30 14:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-30 3:56 underscores in debug output? Christopher Howard
2017-08-30 14:46 ` Alex Vong [this message]
2017-08-30 15:13 ` Christopher Howard
2017-08-30 15:16 ` Christopher Howard
2017-08-30 15:16 ` Christopher Howard
2017-08-31 12:57 ` Matt Wette
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