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From: Dave Love <d.love@dl.ac.uk>
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Subject: Re: Error with latest Gnus
Date: Thu, 08 May 2003 23:47:07 +0100
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Joerg Jaspert <joerg@ganneff.de> writes:

> Debugger entered--Lisp error: (invalid-function (macro lambda (group) "Fi=
nd the real name of a foreign newsgroup." (\` (let ((gname (\, group))) (if=
 (string-match "^[^:]+:" gname) (substring gname (match-end 0)) gname)))))
>   gnus-group-real-name("nnimap+mail:INBOX.Mailinglisten.LWN")
>   #[nil "=C2=C3=C4=08!\"\211^Q\207" [gnus-newsgroup-name in-debian-devel-=
announce-group-p string-match "debian.devel.announce" gnus-group-real-name]=
 4]()
>   run-hooks(gnus-select-article-hook)
>   apply(run-hooks gnus-select-article-hook)

Something in your hooks is broken, either compiled incorrectly
(without the macro being expanded) or it's trying to apply the macro.
By the look of the backtrace it isn't something from Gnus.