[Python-Dev] RE: test_sort.py failure

[Armin Rigo]

Hello again,

I will check the following test in when it is fixed:

    def test_undetected_mutation(self):
        # Python 2.4a1 did not always detect mutation
        memorywaster = []
        for i in range(20):
            def mutating_cmp(x, y):
                L.append(3)
                L.pop()
                return cmp(x, y)
            L = [1,2]
            self.assertRaises(ValueError, L.sort, mutating_cmp)
            def mutating_cmp(x, y):
                L.append(3)
                del L[:]
                return cmp(x, y)
            self.assertRaises(ValueError, L.sort, mutating_cmp)
            memorywaster = [memorywaster]

In the two parts, the list is emptied using two different ways: L.pop() which
uses list_resize(), and del L[:] which uses list_ass_slice().  On my Linux
machine, the first test eventually fails on yesterday's CVS head, but the
second one passes.  Conversely, today's CVS makes the first test pass but the
second one fail.


Armin