bug#37842: Multiple channels with the same name hangs 'guix pull'

[Maxim Cournoyer]

Hello!

When using a channels.scm file such as:

--8<---------------cut here---------------start------------->8---
(cons* (channel
        (name 'my-channel)
        (url "https://gitlab.com/Apteryks/sfl-guix-channel";))
       (channel
        (name 'my-channel)
        (url "https://gitlab.com/Apteryks/my-guix-channel";))
       %default-channels)
--8<---------------cut here---------------end--------------->8---

It should throw an error, but instead it hangs indefinitely, like:

guix pull
Updating channel 'my-channel' from Git repository at 
'https://gitlab.com/Apteryks/sfl-guix-channel'...
Updating channel 'guix' from Git repository at 
'https://git.savannah.gnu.org/git/guix.git'...
[hair starts greying out]

Maxim