From 3784d8343991f56a10b6e58f806364be5feabb84 Mon Sep 17 00:00:00 2001
From: Jakub Bogucki <jakub@confio.gmbh>
Date: Wed, 30 Mar 2022 11:38:01 +0200
Subject: [PATCH] uint: Make is_zero implementation const

---
 uint/src/uint.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/uint/src/uint.rs b/uint/src/uint.rs
index 647a803d7..c136297e8 100644
--- a/uint/src/uint.rs
+++ b/uint/src/uint.rs
@@ -673,9 +673,10 @@ macro_rules! construct_uint {
 
 			/// Whether this is zero.
 			#[inline]
-			pub fn is_zero(&self) -> bool {
+			pub const fn is_zero(&self) -> bool {
 				let &$name(ref arr) = self;
-				for i in 0..$n_words { if arr[i] != 0 { return false; } }
+				let mut i = 0;
+				while i < $n_words { if arr[i] != 0 { return false; } else { i += 1; } }
 				return true;
 			}