Problem with IDL file detection

Hi,

This set of public IDL routines are mis-identified as filetype=cpp
rather than filetype=idlang by Vim (tested on version 7.2):
http://www-astro.physics.ox.ac.uk/~mxc/idl/.

For a specific example, download http://www-astro.physics.ox.ac.uk/~mxc/idl/ppxf_2009-04-14.zip
and look at range.pro (which is detected correctly) and then compare
any of the other *.pro files, which are misidentified as cpp.

Of course I can manually specify the filetype (either on a file-by-
file basis or by associating *.pro with IDL in my vimrc), but these
are valid IDL (and the routines are the number one hit on a Google
search for "IDL"!), so it seems like it should work out of the box.
Playing around, I found that if I remove line 2 from the file (which
is a line containing only the ";" character), the file is correctly
identified. However, I don't know what's going wrong with these files
-- or how to fix it.

Any ideas?

-- Mike

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