bug#53657: inconsistent parsing of the channel sexp's

[Attila Lendvai]

pull.scm does this with channel files, e.g. with /etc/guix/channels.scm:

(load* file (make-user-module '((guix channels))))

i.e. this way field values are EVAL'd. beside the big can of worms that this 
opens up, it also means that e.g. the name field must be quoted: (name 'guix).

then at other occurrences of channels, an sexp parser is used to read them, 
e.g. in the 'dependencies field of a .guix-channel entry. see 
READ-CHANNEL-METADATA in guix/channels.scm.

here the name field is not EVAL'd, and thus it must be specified without 
quotes: (name guix).

this leads to an actual issue that channel dependencies don't match up, unless 
the name is without quotes in the dependencies list specification.

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• attila lendvai
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