From ba99abaf212baf969213b8fb9d8d76b0ce4c1519 Mon Sep 17 00:00:00 2001
From: Guo Ci <zguoci@gmail.com>
Date: Tue, 18 Nov 2025 14:46:39 -0500
Subject: [PATCH] [stdlib] Correct `IllegalMonthError`, `IllegalWeekdayError`
 type stubs (#15050)

---
 stdlib/calendar.pyi | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/stdlib/calendar.pyi b/stdlib/calendar.pyi
index d00f0d5d2..0d3a0a749 100644
--- a/stdlib/calendar.pyi
+++ b/stdlib/calendar.pyi
@@ -56,10 +56,12 @@ if sys.version_info >= (3, 12):
 
 _LocaleType: TypeAlias = tuple[str | None, str | None]
 
-class IllegalMonthError(ValueError):
+class IllegalMonthError(ValueError, IndexError):
+    month: int
     def __init__(self, month: int) -> None: ...
 
 class IllegalWeekdayError(ValueError):
+    weekday: int
     def __init__(self, weekday: int) -> None: ...
 
 def isleap(year: int) -> bool: ...