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In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7)
of 2014-03-07 on lamiak, modified by Debian
Windowing system distributor `The X.Org Foundation


I had this issue for the file in the attachment (so I get an arithmetic 
error when pressing tab). I saw on stackoverflow that this should best 
be reported to emacs, so I did.