FTBFS due to test failures

cython fails to build in precise. full build log available here:

https://launchpad.net/ubuntu/+source/cython/0.15.1-1/+build/2961231/+files/buildlog_ubuntu-precise-armhf.cython_0.15.1-1_FAILEDTOBUILD.txt.gz

The failure is specifically in the test suite:

======================================================================
FAIL: test (line 1) (dict_getitem.__test__)
Doctest: dict_getitem.__test__.test (line 1)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/doctest.py", line 2166, in runTest
    raise self.failureException(self.format_failure(new.getvalue()))
AssertionError: Failed doctest test for dict_getitem.__test__.test (line 1)
  File "/build/buildd/cython-0.15.1/build/work-dir/run/c/dict_getitem.so", line unknown line number, in test (line 1)

----------------------------------------------------------------------
File "/build/buildd/cython-0.15.1/build/work-dir/run/c/dict_getitem.so", line ?, in dict_getitem.__test__.test (line 1)
Failed example:
    test(None, 1) # doctest: +ELLIPSIS
Expected:
    Traceback (most recent call last):
    TypeError: ...subscriptable...
Got:
    Traceback (most recent call last):
      File "/usr/lib/python2.7/doctest.py", line 1254, in __run
        compileflags, 1) in test.globs
      File "<doctest dict_getitem.__test__.test (line 1)[6]>", line 1, in <module>
        test(None, 1) # doctest: +ELLIPSIS
      File "dict_getitem.pyx", line 26, in dict_getitem.test (dict_getitem.c:561)
    TypeError: 'NoneType' object has no attribute '__getitem__'

======================================================================
FAIL: test (line 1) (dict_getitem.__test__)
Doctest: dict_getitem.__test__.test (line 1)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/doctest.py", line 2166, in runTest
    raise self.failureException(self.format_failure(new.getvalue()))
AssertionError: Failed doctest test for dict_getitem.__test__.test (line 1)
  File "/build/buildd/cython-0.15.1/build/work-dir/run/cpp/dict_getitem.so", line unknown line number, in test (line 1)

----------------------------------------------------------------------
File "/build/buildd/cython-0.15.1/build/work-dir/run/cpp/dict_getitem.so", line ?, in dict_getitem.__test__.test (line 1)
Failed example:
    test(None, 1) # doctest: +ELLIPSIS
Expected:
    Traceback (most recent call last):
    TypeError: ...subscriptable...
Got:
    Traceback (most recent call last):
      File "/usr/lib/python2.7/doctest.py", line 1254, in __run
        compileflags, 1) in test.globs
      File "<doctest dict_getitem.__test__.test (line 1)[6]>", line 1, in <module>
        test(None, 1) # doctest: +ELLIPSIS
      File "dict_getitem.pyx", line 26, in dict_getitem.test (dict_getitem.cpp:561)
    TypeError: 'NoneType' object has no attribute '__getitem__'

======================================================================
FAIL: index ()
Doctest: index
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/doctest.py", line 2166, in runTest
    raise self.failureException(self.format_failure(new.getvalue()))
AssertionError: Failed doctest test for index
  File "/build/buildd/cython-0.15.1/build/work-dir/run/c/index.so", line 37, in index

----------------------------------------------------------------------
File "/build/buildd/cython-0.15.1/build/work-dir/run/c/index.so", line 39, in index
Failed example:
    index_object(100, 100)
Expected:
    Traceback (most recent call last):
    ...
    TypeError: 'int' object is not subscriptable
Got:
    Traceback (most recent call last):
      File "/usr/lib/python2.7/doctest.py", line 1254, in __run
        compileflags, 1) in test.globs
      File "<doctest index[0]>", line 1, in <module>
        index_object(100, 100)
      File "index.pyx", line 65, in index.index_object (index.c:915)
    TypeError: 'int' object has no attribute '__getitem__'

======================================================================
FAIL: index ()
Doctest: index
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/doctest.py", line 2166, in runTest
    raise self.failureException(self.format_failure(new.getvalue()))
AssertionError: Failed doctest test for index
  File "/build/buildd/cython-0.15.1/build/work-dir/run/cpp/index.so", line 43, in index

----------------------------------------------------------------------
File "/build/buildd/cython-0.15.1/build/work-dir/run/cpp/index.so", line 45, in index
Failed example:
    index_object(100, 100)
Expected:
    Traceback (most recent call last):
    ...
    TypeError: 'int' object is not subscriptable
Got:
    Traceback (most recent call last):
      File "/usr/lib/python2.7/doctest.py", line 1254, in __run
        compileflags, 1) in test.globs
      File "<doctest index[0]>", line 1, in <module>
        index_object(100, 100)
      File "index.pyx", line 65, in index.index_object (index.cpp:915)
    TypeError: 'int' object has no attribute '__getitem__'

I have verified this in a from-upstream-source-tarball build under a Python 2.7 virtualenv, using gcc 4.6.2 on Precise. However, the source tarball builds and tests perfectly fine in a 2.6 or 2.7 virtualenv on Ubuntu 11.10 using gcc-4.6.1. I also tested with gcc-4.5.3 on precise with Python 2.7 and I get the exact same error. I'm currently at a loss for what the problem could be but will contact upstream to see if they have any ideas.

Note too that it makes no difference if I comment out the Scriptable cdef class in dict_getitem.pyx. I can't actually tell what this class is supposed to do, but it makes no difference to the test failure. Next up, I'll try the same thing on precise with a from-source build of Python 2.7 and 2.7.