From 4fec8a35b647e8905a4ea8093002e3afe4b9b4e1 Mon Sep 17 00:00:00 2001
From: Konrad Borowski <konrad@borowski.pw>
Date: Wed, 3 May 2023 12:33:15 +0200
Subject: [PATCH] Constify slice flatten method

---
 library/core/src/slice/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
index 33a468a6bca57..d4981af90d19e 100644
--- a/library/core/src/slice/mod.rs
+++ b/library/core/src/slice/mod.rs
@@ -4257,7 +4257,7 @@ impl<T, const N: usize> [[T; N]] {
     /// assert!(empty_slice_of_arrays.flatten().is_empty());
     /// ```
     #[unstable(feature = "slice_flatten", issue = "95629")]
-    pub fn flatten(&self) -> &[T] {
+    pub const fn flatten(&self) -> &[T] {
         let len = if T::IS_ZST {
             self.len().checked_mul(N).expect("slice len overflow")
         } else {