From cc0b41a99498f76a8e15f3ece70ee8dd52bd4a9d Mon Sep 17 00:00:00 2001
From: Rob Percival <rob.percival@kraken.tech>
Date: Fri, 10 Nov 2023 17:53:03 +0000
Subject: [PATCH] Fix type hints for
 `unittest.util.unorderable_list_difference()` (#11012)

Fix type hints for unorderable_list_difference()

It claimed that the arguments were `Sequence` types (immutable), but the function removes elements from them, so they must be `MutableSequence` types. Specifically, it calls `pop()` on the first argument and `remove()` on the second argument.

See the function implementation for details:
https://github.com/python/cpython/blame/0b06d2482d77e02c5d40e221f6046c9c355458b2/Lib/unittest/util.py#L98-L113
---
 stdlib/unittest/util.pyi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/stdlib/unittest/util.pyi b/stdlib/unittest/util.pyi
index 845accfeb..c42d1346e 100644
--- a/stdlib/unittest/util.pyi
+++ b/stdlib/unittest/util.pyi
@@ -1,4 +1,4 @@
-from collections.abc import Sequence
+from collections.abc import MutableSequence, Sequence
 from typing import Any, TypeVar
 from typing_extensions import TypeAlias
 
@@ -17,7 +17,7 @@ def _common_shorten_repr(*args: str) -> tuple[str, ...]: ...
 def safe_repr(obj: object, short: bool = False) -> str: ...
 def strclass(cls: type) -> str: ...
 def sorted_list_difference(expected: Sequence[_T], actual: Sequence[_T]) -> tuple[list[_T], list[_T]]: ...
-def unorderable_list_difference(expected: Sequence[_T], actual: Sequence[_T]) -> tuple[list[_T], list[_T]]: ...
+def unorderable_list_difference(expected: MutableSequence[_T], actual: MutableSequence[_T]) -> tuple[list[_T], list[_T]]: ...
 def three_way_cmp(x: Any, y: Any) -> int: ...
 def _count_diff_all_purpose(actual: Sequence[_T], expected: Sequence[_T]) -> list[_Mismatch[_T]]: ...
 def _count_diff_hashable(actual: Sequence[_T], expected: Sequence[_T]) -> list[_Mismatch[_T]]: ...