Only update the arr variable when PyObject_RichCompareBool() has been called.
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@ -78,6 +78,7 @@ siftup(PyListObject *heap, Py_ssize_t pos)
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if (cmp < 0)
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return -1;
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childpos += ((unsigned)cmp ^ 1); /* increment when cmp==0 */
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arr = _PyList_ITEMS(heap); /* arr may have changed */
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if (endpos != PyList_GET_SIZE(heap)) {
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PyErr_SetString(PyExc_RuntimeError,
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"list changed size during iteration");
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@ -85,7 +86,6 @@ siftup(PyListObject *heap, Py_ssize_t pos)
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}
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}
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/* Move the smaller child up. */
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arr = _PyList_ITEMS(heap);
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tmp1 = arr[childpos];
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tmp2 = arr[pos];
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arr[childpos] = tmp2;
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@ -432,6 +432,7 @@ siftup_max(PyListObject *heap, Py_ssize_t pos)
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if (cmp < 0)
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return -1;
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childpos += ((unsigned)cmp ^ 1); /* increment when cmp==0 */
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arr = _PyList_ITEMS(heap); /* arr may have changed */
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if (endpos != PyList_GET_SIZE(heap)) {
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PyErr_SetString(PyExc_RuntimeError,
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"list changed size during iteration");
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@ -439,7 +440,6 @@ siftup_max(PyListObject *heap, Py_ssize_t pos)
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}
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}
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/* Move the smaller child up. */
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arr = _PyList_ITEMS(heap);
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tmp1 = arr[childpos];
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tmp2 = arr[pos];
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arr[childpos] = tmp2;
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