From e82e6a97ca641cc574e48d8f3d8482b24f0f9601 Mon Sep 17 00:00:00 2001
From: Joshua Nelson <jyn514@gmail.com>
Date: Mon, 20 Jan 2020 11:09:32 -0500
Subject: [PATCH 1/3] impl From<T> for [T; 1]

---
 src/libcore/slice/mod.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/libcore/slice/mod.rs b/src/libcore/slice/mod.rs
index 9b4d201573238..eba10aff795eb 100644
--- a/src/libcore/slice/mod.rs
+++ b/src/libcore/slice/mod.rs
@@ -5521,6 +5521,13 @@ impl<T: PartialOrd> PartialOrd for [T] {
     }
 }
 
+#[unstable(feature = "array_from_single", reason = "newly added", issue = "none")]
+impl<T> From<T> for [T; 1] {
+    fn from(val: T) -> [T; 1] {
+        [val]
+    }
+}
+
 #[doc(hidden)]
 // intermediate trait for specialization of slice's PartialEq
 trait SlicePartialEq<B> {

From 3f13511a094a138b9b3ae867d98101a190ea117d Mon Sep 17 00:00:00 2001
From: Joshua Nelson <jyn514@gmail.com>
Date: Mon, 20 Jan 2020 14:01:36 -0500
Subject: [PATCH 2/3] impls are insta-stable

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

diff --git a/src/libcore/slice/mod.rs b/src/libcore/slice/mod.rs
index eba10aff795eb..8b3474909f5b9 100644
--- a/src/libcore/slice/mod.rs
+++ b/src/libcore/slice/mod.rs
@@ -5521,7 +5521,7 @@ impl<T: PartialOrd> PartialOrd for [T] {
     }
 }
 
-#[unstable(feature = "array_from_single", reason = "newly added", issue = "none")]
+#[stable(feature = "array_from_single", since = "1.42")]
 impl<T> From<T> for [T; 1] {
     fn from(val: T) -> [T; 1] {
         [val]

From dde4b8c3c298ebc7004894d4df02eaf0887617e5 Mon Sep 17 00:00:00 2001
From: Joshua Nelson <jyn514@gmail.com>
Date: Mon, 20 Jan 2020 14:16:40 -0500
Subject: [PATCH 3/3] use fully qualified version number

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

diff --git a/src/libcore/slice/mod.rs b/src/libcore/slice/mod.rs
index 8b3474909f5b9..f15e149e0eb79 100644
--- a/src/libcore/slice/mod.rs
+++ b/src/libcore/slice/mod.rs
@@ -5521,7 +5521,7 @@ impl<T: PartialOrd> PartialOrd for [T] {
     }
 }
 
-#[stable(feature = "array_from_single", since = "1.42")]
+#[stable(feature = "array_from_single", since = "1.42.0")]
 impl<T> From<T> for [T; 1] {
     fn from(val: T) -> [T; 1] {
         [val]