From 18e4a57b0709fe3122ef20144d123cfaf879c3a3 Mon Sep 17 00:00:00 2001
From: Lzu Tao <taolzu@gmail.com>
Date: Sun, 20 Oct 2019 16:22:23 +0000
Subject: [PATCH] constify is_power_of_two

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

diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 8f4ade377e312..7b0cdd67600e8 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -3757,8 +3757,8 @@ assert!(!10", stringify!($SelfT), ".is_power_of_two());", $EndFeature, "
 ```"),
             #[stable(feature = "rust1", since = "1.0.0")]
             #[inline]
-            pub fn is_power_of_two(self) -> bool {
-                (self.wrapping_sub(1)) & self == 0 && !(self == 0)
+            pub const fn is_power_of_two(self) -> bool {
+                (self.wrapping_sub(1) & self == 0) & (self != 0)
             }
         }