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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: [PATCH] gnu: Allow nfs file systems to be automatically mounted.
Date: Mon, 28 Nov 2016 22:05:15 +0100
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In-Reply-To: <20161128140754.GA7013@jocasta.intra> (John Darrington's message
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To: John Darrington <john@darrington.wattle.id.au>
Cc: guix-devel@gnu.org, John Darrington <jmd@gnu.org>

John Darrington <john@darrington.wattle.id.au> skribis:

> On Mon, Nov 28, 2016 at 02:59:09PM +0100, Ludovic Court??s wrote:
>      >      ???match???,=20
>      >
>      > Have another look: +    (let* ((host (match (string-split source #=
\:) ((h _) h)))
>=20=20=20=20=20=20
>      Right, but there are other occurrences of ???car??? for ???getaddrin=
fo???.  :-)
>
> But that occurance applies to a real list, rather than a list used as rec=
ord.
> In other words, I really do just want to get the first item of that list.
> As I understand it, match is supposed to be used for heterogenous lists w=
here
> each member has its own semantics.  That is not the case here.

=E2=80=98match=E2=80=99 can be used to match anything, and I highly recomme=
nd using it
for lists (info "(guile) Pairs"): it generates clearer and foolproof
code.

In this case =E2=80=98getaddrinfo=E2=80=99 might well return an empty list.

Ludo=E2=80=99.