From: Maxime Devos <maximedevos@telenet.be>
To: Philip McGrath <philip@philipmcgrath.com>, 52749@debbugs.gnu.org
Subject: bug#52749: G-expressions don't consistently preserve #nil
Date: Mon, 03 Jan 2022 10:28:34 +0000 [thread overview]
Message-ID: <d7e066710582b2abbb84b5387fbe60bfcec360e4.camel@telenet.be> (raw)
In-Reply-To: <d7d030d9-c7aa-0297-d343-daafc6ec0691@philipmcgrath.com>
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Philip McGrath schreef op ma 27-12-2021 om 13:38 [-0500]:
> I think the behavior of `gexp->approximate-sexp` is at least defensible,
> since its documentation (`info guix "gexp->approximate-sexp"`) warns
> that "some information can be lost".
But no information is lost in this case?
$ guix repl
> (use-modules (guix gexp))
> (gexp->approximate-sexp #~(a . #nil))
$1 = (a) ; sure, the #nil isn't printed ...
> (cdr $1)
$2 = () ; ... also not printed ...
> (values (eq? (cdr $1) #nil) (eq? (cdr $1) '()))
$3 = #t ; but it's still there!
$4 = #f
Greetings,
Maxime
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next prev parent reply other threads:[~2022-01-03 10:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-23 4:25 bug#52749: G-expressions don't consistently preserve #nil Philip McGrath
2021-12-23 6:59 ` Maxime Devos
2021-12-25 11:13 ` Maxime Devos
2021-12-27 18:38 ` Philip McGrath
2021-12-27 20:24 ` Maxime Devos
2022-01-03 10:28 ` Maxime Devos [this message]
2022-01-03 10:49 ` Maxime Devos
2021-12-23 17:58 ` Maxime Devos
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