From 66209cd9b57f9414c9b8bc826ca97c4b7d52489a Mon Sep 17 00:00:00 2001
From: ultrabear <bearodark@gmail.com>
Date: Sun, 27 Oct 2024 14:31:58 -0700
Subject: [PATCH] Support `char::is_digit` in const contexts

---
 library/core/src/char/methods.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/library/core/src/char/methods.rs b/library/core/src/char/methods.rs
index 9c667edb476..206bbf5690e 100644
--- a/library/core/src/char/methods.rs
+++ b/library/core/src/char/methods.rs
@@ -320,8 +320,9 @@ pub const fn from_digit(num: u32, radix: u32) -> Option<char> {
     /// '1'.is_digit(37);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[rustc_const_unstable(feature = "const_char_is_digit", issue = "132241")]
     #[inline]
-    pub fn is_digit(self, radix: u32) -> bool {
+    pub const fn is_digit(self, radix: u32) -> bool {
         self.to_digit(radix).is_some()
     }