From 713bcbbd05805124a2736d1f1560a7214e12e445 Mon Sep 17 00:00:00 2001
From: Mark Mendoza <mendoza.mark.a@gmail.com>
Date: Tue, 27 Apr 2021 16:54:09 -0700
Subject: [PATCH] Support concatenating lists with different contents

---
 stdlib/builtins.pyi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdlib/builtins.pyi b/stdlib/builtins.pyi
index de4813a5d961..385a77520bb9 100644
--- a/stdlib/builtins.pyi
+++ b/stdlib/builtins.pyi
@@ -767,7 +767,7 @@ class list(MutableSequence[_T], Generic[_T]):
     @overload
     def __setitem__(self, s: slice, o: Iterable[_T]) -> None: ...
     def __delitem__(self, i: Union[SupportsIndex, slice]) -> None: ...
-    def __add__(self, x: List[_T]) -> List[_T]: ...
+    def __add__(self, x: List[_T1]) -> List[Union[_T, _T1]]: ...
     def __iadd__(self: _S, x: Iterable[_T]) -> _S: ...
     def __mul__(self, n: int) -> List[_T]: ...
     def __rmul__(self, n: int) -> List[_T]: ...