[Cython] circular cimports

[David Harvey]

Hi,

In Sage, if I try to add

from sage.rings.integer cimport Integer

at the top of sage/misc/misc_c.pyx, everything compiles fine, but  
then I get some weird import error when I start up sage.

(I'm sorry, I don't know enough about cython to reproduce this in a  
standalone cython program, I only know how to make it happen in sage.)

It looks like a "circular cimport problem". I found this post by Greg  
Ewing which seems relevant, but it's a bit old now, and I don't quite  
understand what he's saying:

http://osdir.com/ml/python.pyrex/2006-06/msg00020.html

Is there any way to successfully cimport Integer into that module? Or  
do I need to just put the code that references Integer in some other  
random place which is guaranteed to get loaded after  
sage.rings.integer? (This would be a bit annoying....)

I don't quite understand why circular cimports should exist, since I  
thought these kinds of things got resolved at compile time.

david