From dda015aebca79d508b74cae6a0ecfb0a093d8639 Mon Sep 17 00:00:00 2001
From: Dylan MacKenzie <ecstaticmorse@gmail.com>
Date: Mon, 3 Feb 2020 13:17:13 -0800
Subject: [PATCH] Make saturating arithmetic using intrinsics `const`

---
 src/libcore/num/mod.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index f590c6bc7c2..38989004f91 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -1091,8 +1091,9 @@ $EndFeature, "
 ```"),
 
             #[unstable(feature = "saturating_neg", issue = "59983")]
+            #[rustc_const_unstable(feature = "const_int_saturating", issue = "53718")]
             #[inline]
-            pub fn saturating_neg(self) -> Self {
+            pub const fn saturating_neg(self) -> Self {
                 intrinsics::saturating_sub(0, self)
             }
         }
@@ -1117,8 +1118,9 @@ $EndFeature, "
 ```"),
 
             #[unstable(feature = "saturating_neg", issue = "59983")]
+            #[rustc_const_unstable(feature = "const_int_saturating", issue = "53718")]
             #[inline]
-            pub fn saturating_abs(self) -> Self {
+            pub const fn saturating_abs(self) -> Self {
                 if self.is_negative() {
                     self.saturating_neg()
                 } else {