[Cython] Cython circular cdef import patch

[Stefan Behnel]

Hi,

Gary Furnish wrote:
> Can you produce a testcase for this issue?  It is *critical* for fast
> symbolics in Sage, so I would prefer to fix the bug as opposed to reverting.
> I see the problem now, but I will need the test cases you are using to
> produce a fix.  Once I have them it should be a relatively easy patch.

Here is a test case for the ordering bug (and a fix for the test runner). A
test for the header file generation is harder to write, as it requires
breaking out of the current "compile[-run]" test scheme into a
"compile-compile[-run]" scheme that builds a module against the previously
generated header file. I have currently no idea how to enable that in anything
but an ugly hackish way.

Stefan
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