Fix AOT __setitem__ raising not implemented

Author: Annakan

tests/test_items.py

@@ -128,6 +128,14 @@ def test_aot_unwrap():
             assert_is_ppo(ku, str)
             assert_is_ppo(vu, str)
 
+def test_aot_set_item():
+    d = item(["A", {"b": "B"}])
+    d[0] = "C"
+    assert d[0] == "C"
+    d[1]["b"] = "D"
+    assert d[1]["b"] == "D"
+    d[0] =  {"c": "C"}
+    assert d[0]["c"] == "C"
 
 def test_time_unwrap():
     t = time(3, 8, 14)
@@ -1019,3 +1027,5 @@ def test_removal_of_arrayitem_with_extra_whitespace():
     docstr = doc.as_string()
     parse(docstr)
     assert docstr == expected
+
+

tomlkit/items.py

@@ -1885,7 +1885,7 @@ def __getitem__(self, key):
         return self._body[key]
 
     def __setitem__(self, key: slice | int, value: Any) -> None:
-        raise NotImplementedError
+        self._body[key] = item(value, _parent=self)
 
     def __delitem__(self, key: slice | int) -> None:
         del self._body[key]