test without __add__ overload

Author: randolf-scholz

stdlib/builtins.pyi

@@ -1154,9 +1154,6 @@ class list(MutableSequence[_T]):
     def __setitem__(self, key: slice[SupportsIndex | None], value: Iterable[_T], /) -> None: ...
     def __delitem__(self, key: SupportsIndex | slice[SupportsIndex | None], /) -> None: ...
     # Overloading looks unnecessary, but is needed to work around complex mypy problems
-    @overload
-    def __add__(self, value: list[_T], /) -> list[_T]: ...
-    @overload
     def __add__(self, value: list[_S], /) -> list[_S | _T]: ...
     def __iadd__(self, value: Iterable[_T], /) -> Self: ...  # type: ignore[misc]
     def __mul__(self, value: SupportsIndex, /) -> list[_T]: ...