From aea90f17e144e732c9bedf52a37844b3d6c3449c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Beno=C3=AEt=20du=20Garreau?= <benoit@dugarreau.fr>
Date: Wed, 2 Sep 2026 22:19:51 +0200
Subject: [PATCH] Implement `Rng` for `Box`

---
 library/alloc/src/boxed.rs | 8 ++++++++
 library/alloc/src/lib.rs   | 1 +
 2 files changed, 9 insertions(+)

diff --git a/library/alloc/src/boxed.rs b/library/alloc/src/boxed.rs
index 473f01660bdb4..0147c719c32b2 100644
--- a/library/alloc/src/boxed.rs
+++ b/library/alloc/src/boxed.rs
@@ -2568,3 +2568,11 @@ unsafe impl<T: ?Sized + Allocator, A: Allocator> Allocator for Box<T, A> {
         unsafe { (**self).shrink(ptr, old_layout, new_layout) }
     }
 }
+
+#[unstable(feature = "random", issue = "130703")]
+impl<R: core::random::Rng + ?Sized, A: Allocator> core::random::Rng for Box<R, A> {
+    #[inline]
+    fn fill_bytes(&mut self, bytes: &mut [u8]) {
+        (**self).fill_bytes(bytes)
+    }
+}
diff --git a/library/alloc/src/lib.rs b/library/alloc/src/lib.rs
index 89b15a169dce0..539bf5c532552 100644
--- a/library/alloc/src/lib.rs
+++ b/library/alloc/src/lib.rs
@@ -160,6 +160,7 @@
 #![feature(ptr_cast_slice)]
 #![feature(ptr_internals)]
 #![feature(ptr_metadata)]
+#![feature(random)]
 #![feature(raw_os_error_ty)]
 #![feature(rev_into_inner)]
 #![feature(seek_stream_len)]