bug#18198: Gnus fails to read ~/.newsrc with group names which are not symbols

[Ivan Shmakov]

>>>>> Lars Ingebrigtsen <larsi@gnus.org> writes:
>>>>> Ivan Shmakov <ivan@siamics.net> writes:

[…]

 >> Here, the “group” field of .newsrc is read as an Emacs Lisp
 >> expression.  Which may result either in an error, or, in the case of
 >> [Hello]/World – and, similarly, (Hello)/World – in only the leading
 >> [Hello] or (Hello) being actually read.

 > Well, "[Hello]/World" isn't a valid newsgroup name,

        Yet (Hello)/World is.  (Per the newsgroup-name and wildmat-exact
        productions given in section 9.8 of RFC 3977.)

 > and I think only newsgroups are supposed to be in ~/.newsrc?  How did
 > you get such a group name there?

        I didn’t.  The person who brought this issue to IRC has
        apparently used something like (nnimap "imap.gmail.com") for
        gnus-select-method.

        Though indeed, I know of no reason /not/ to set
        gnus-save-newsrc-file to nil in this case.

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