@@
expression slice, length, start, stop, step, slicelen, ret;
statement stmt;
@@
-if (PySlice_GetIndicesEx(slice, length, &start, &stop, &step, &slicelen) < 0)
+if (PySlice_Unpack(slice, &start, &stop, &step) < 0)
     stmt
+slicelen = PySlice_AdjustIndices(length, &start, &stop, step);