one more specialization

eendebakpt · eendebakpt · commit 1c459d0b4968 · 2022-07-11T22:40:12.000+02:00
diff --git a/Objects/listobject.c b/Objects/listobject.c
@@ -700,10 +700,16 @@ list_ass_slice(PyListObject *a, Py_ssize_t ilow, Py_ssize_t ihigh, PyObject *v)
     }
 
     if (d < 0) { /* Delete -d items */
-        Py_ssize_t tail;
-        tail = (Py_SIZE(a) - ihigh) * sizeof(PyObject *);
-        memmove(&item[ihigh+d], &item[ihigh], tail);
+        if((Py_SIZE(a) - ihigh)==1) {
+            item[ihigh-1] = item[ihigh];
+        }
+        else {
+            Py_ssize_t tail;
+            tail = (Py_SIZE(a) - ihigh) * sizeof(PyObject *);
+            memmove(&item[ihigh+d], &item[ihigh], tail);
+        }
         if (list_resize(a, Py_SIZE(a) + d) < 0) {
+            Py_ssize_t tail = (Py_SIZE(a) - ihigh) * sizeof(PyObject *);
             memmove(&item[ihigh], &item[ihigh+d], tail);
             memcpy(&item[ilow], recycle, s);
             goto Error;
