/* Python 3.10 source code */staticintlist_ass_subscript(PyListObject*self,PyObject*item,PyObject*value){if (_PyIndex_Check(item)) {/* ... */ }elseif (PySlice_Check(item)) {Py_ssize_tstart,stop,step,slicelength;if (PySlice_Unpack(item,&start,&stop,&step)<0) {return-1;        }slicelength=PySlice_AdjustIndices(Py_SIZE(self),&start,&stop,step);if (step==1)returnlist_ass_slice(self,start,stop,value);/* Make sure s[5:2] = [..] inserts at the right place:           before 5, not before 2. */if ((step<0&&start<stop)||            (step>0&&start>stop))stop=start;if (value==NULL) {/* ... */ }else {/* assign slice */PyObject*ins,*seq;PyObject**garbage,**seqitems,**selfitems;Py_ssize_ti;size_tcur;/* protect against a[::-1] = a */if (self== (PyListObject*)value) {seq=list_slice((PyListObject*)value,0,PyList_GET_SIZE(value));            }else {seq=PySequence_Fast(value,// <-- call arbitrary code in python"must assign iterable ""to extended slice");            }if (!seq)return-1;/* ... */selfitems=self->ob_item;seqitems=PySequence_Fast_ITEMS(seq);for (cur=start,i=0;i<slicelength;cur+= (size_t)step,i++) {garbage[i]=selfitems[cur];ins=seqitems[i];Py_INCREF(ins);selfitems[cur]=ins;// <-- maybe out of bounds            }/* ... */        }/* ... */}

classevil:def__init__(self,lst):self.lst=lstdef__iter__(self):yieldfromself.lstself.lst.clear()lst=list(range(10))lst[::-1]=evil(lst)