From: Mark H Weaver <mhw@netris.org>
To: Arun Isaac <arunisaac@systemreboot.net>
Cc: 30145@debbugs.gnu.org
Subject: bug#30145: [PATCH] doc: Document undefined?.
Date: Sun, 21 Jan 2018 09:33:40 -0500 [thread overview]
Message-ID: <871sijnuwr.fsf@netris.org> (raw)
In-Reply-To: <20180117175204.1381-1-arunisaac@systemreboot.net> (Arun Isaac's message of "Wed, 17 Jan 2018 23:22:04 +0530")
Arun Isaac <arunisaac@systemreboot.net> writes:
> * doc/ref/data-rep.texi: Document undefined?.
Is 'undefined?' a procedure in your Guile? It's not available at my
Guile REPL,and I can't find a single occurrence of 'undefined?' in my
guile stable-2.2 git checkout.
There is a special SCM_UNDEFINED value at the C level, but it's only
used for a couple of internal purposes and not usable from Scheme at
all.
FYI, the two internal purposes are these: (1) if SCM_UNDEFINED is passed
as an optional argument to a Scheme procedure implemented in C, this
indicates that the optional argument was not actually present. (2) if
SCM_UNDEFINED is stored in a top-level variable object, that indicates
that the variable is no longer bound, i.e. it was actually removed.
Mark
prev parent reply other threads:[~2018-01-21 14:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-17 17:52 bug#30145: [PATCH] doc: Document undefined? Arun Isaac
[not found] ` <handler.30145.B.15162115551614.ack@debbugs.gnu.org>
2018-01-18 6:16 ` bug#30145: Acknowledgement ([PATCH] doc: Document undefined?.) Arun Isaac
2018-01-18 6:20 ` bug#30145: [PATCH] doc: Document unspecified? Arun Isaac
2018-01-21 14:48 ` Mark H Weaver
2018-01-21 18:22 ` Arun Isaac
2018-01-21 14:33 ` Mark H Weaver [this message]
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