go back to using tuple, but add more override statements where it complained last time

Author: wyattscarpenter

test-data/unit/check-flags.test

@@ -2487,8 +2487,7 @@ class Child(Parent):
     @override
     def g(self, y: int) -> bool: #type: ignore # E: Unused "type: ignore" comment # E: "type: ignore" comment without error code
         return True
-[builtins fixtures/primitives.pyi]
-[typing fixtures/typing-full.pyi]
+[builtins fixtures/tuple.pyi]
 
 [case testSpotCheckErrorCodeAllNotUsed]
 # This test case exists purely to ensure that the testSpotCheckErrorCodeAll test does not become obsolete.
@@ -2511,5 +2510,4 @@ class Child(Parent):
     @override
     def g(self, y: int) -> bool: #type: ignore
         return True
-[builtins fixtures/primitives.pyi]
-[typing fixtures/typing-full.pyi]
+[builtins fixtures/tuple.pyi]

test-data/unit/fixtures/tuple.pyi

@@ -2,6 +2,7 @@
 
 import _typeshed
 from typing import Iterable, Iterator, TypeVar, Generic, Sequence, Optional, overload, Tuple, Type, Self
+from typing_extensions import override
 
 _T = TypeVar("_T")
 _Tco = TypeVar('_Tco', covariant=True)
@@ -15,8 +16,10 @@ class type:
     def __call__(self, *a: object) -> object: pass
 class tuple(Sequence[_Tco], Generic[_Tco]):
     def __new__(cls: Type[_T], iterable: Iterable[_Tco] = ...) -> _T: ...
+    @override
     def __iter__(self) -> Iterator[_Tco]: pass
     def __contains__(self, item: object) -> bool: pass
+    @override
     @overload
     def __getitem__(self, x: int) -> _Tco: pass
     @overload
@@ -42,11 +45,13 @@ class bytes: pass
 class bytearray: pass
 
 class list(Sequence[_T], Generic[_T]):
+    @override
     @overload
     def __getitem__(self, i: int) -> _T: ...
     @overload
     def __getitem__(self, s: slice) -> list[_T]: ...
     def __contains__(self, item: object) -> bool: ...
+    @override
     def __iter__(self) -> Iterator[_T]: ...
 
 def isinstance(x: object, t: type) -> bool: pass