From 9840c584515d25733dc6b60ac4afb608c7b0a808 Mon Sep 17 00:00:00 2001
From: Semyon Moroz <donbarbos@proton.me>
Date: Sat, 10 Jan 2026 23:20:27 +0000
Subject: [PATCH] [sre_compile] Use TypeGuard for isstring (#15250)

---
 stdlib/sre_compile.pyi | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/stdlib/sre_compile.pyi b/stdlib/sre_compile.pyi
index d8f0b7937..e29d63d48 100644
--- a/stdlib/sre_compile.pyi
+++ b/stdlib/sre_compile.pyi
@@ -2,10 +2,14 @@ from re import Pattern
 from sre_constants import *
 from sre_constants import _NamedIntConstant
 from sre_parse import SubPattern
-from typing import Any, Final
+from typing import Any, Final, Literal, overload
+from typing_extensions import TypeGuard
 
 MAXCODE: Final[int]
 
 def dis(code: list[_NamedIntConstant]) -> None: ...
-def isstring(obj: Any) -> bool: ...
+@overload
+def isstring(obj: str | bytes) -> Literal[True]: ...
+@overload
+def isstring(obj: object) -> TypeGuard[str | bytes]: ...
 def compile(p: str | bytes | SubPattern, flags: int = 0) -> Pattern[Any]: ...