This can be narrowed down to the following test sequence:

$ ./python -E -m test.regrtest test_heapq test_import
test_heapq
test_import
Warning -- sys.path was modified by test_import
test test_import failed -- Traceback (most recent call last):
  File "/home/antoine/py3k/__svn__/Lib/test/test_import.py", line 167, in test_module_with_large_stack
    exec('import ' + module)
  File "<string>", line 1, in <module>
  File "/home/antoine/py3k/__svn__/Lib/importlib/_bootstrap.py", line 151, in decorated
    return fxn(self, module)
  File "/home/antoine/py3k/__svn__/Lib/importlib/_bootstrap.py", line 320, in load_module
    code_object = self.get_code(module.__name__)
  File "/home/antoine/py3k/__svn__/Lib/importlib/_bootstrap.py", line 429, in get_code
    "object for {0!r}".format(fullname))
ImportError: no source or bytecode available to create code object for 'longlist'


test_heapq involves test.support.import_fresh_module().