From 92d135a37c8d449c756d5470b839c70d8ad4b44e Mon Sep 17 00:00:00 2001
From: Nikita Sobolev <mail@sobolevn.me>
Date: Fri, 28 Jan 2022 12:33:45 +0300
Subject: [PATCH] Use `TypeGuard` in `ElementTree.pyi` (#7059)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
---
 stdlib/xml/etree/ElementTree.pyi | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/stdlib/xml/etree/ElementTree.pyi b/stdlib/xml/etree/ElementTree.pyi
index c4236cf29..c0bef1e0b 100644
--- a/stdlib/xml/etree/ElementTree.pyi
+++ b/stdlib/xml/etree/ElementTree.pyi
@@ -16,7 +16,7 @@ from typing import (
     Union,
     overload,
 )
-from typing_extensions import Literal, SupportsIndex
+from typing_extensions import Literal, SupportsIndex, TypeGuard
 
 _T = TypeVar("_T")
 _File = Union[StrOrBytesPath, FileDescriptor, IO[Any]]
@@ -27,7 +27,8 @@ class ParseError(SyntaxError):
     code: int
     position: tuple[int, int]
 
-def iselement(element: object) -> bool: ...
+# In reality it works based on `.tag` attribute duck typing.
+def iselement(element: object) -> TypeGuard[Element]: ...
 
 if sys.version_info >= (3, 8):
     @overload