the "AMD64 W2k8 3.0" buildbot always fail test_sys:

...
    check(range(66000), size(h + '3l'))
...
AssertionError: wrong size for <class 'range'>: got 56, expected 48

The previous line of the test is:
    check(range(1), size(h + '3P'))
(win64 is the only platform where 'P' has a different size than 'l')
Why are there two versions of the structure? There is only one range 
object.

I suggest to replace the failing line with:
    check(range(66000), size(h + '3P'))
to properly reflect the three PyObject* of the structure.