Weird error when compiling org 4.66

[Tassilo Horn <tassilo@member.fsf.org>]

Hi all,

I'm trying to update to org-4.66, but I get a weird error when trying to
byte-compile org.el:

,----
| $ emacs --batch -f batch-byte-compile --no-site-file --no-init-file org.el 
| 
| In toplevel form:
| org.el:72:13:Error: Wrong type argument: integer-or-marker-p, "räksmörgås
| "
`----

The error seems to be in the (require 'calendar) line in the first
eval-when-compile in org.el. I grepped org's and emacs' sources, but I
cannot find the string "räksmörgås"...

Does anyone have a clue where this error comes from?

Bye,
Tassilo
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