From 13d17adf6059552358c8601aaa407aea5ddddb98 Mon Sep 17 00:00:00 2001
From: Simon Sapin <simon.sapin@exyr.org>
Date: Mon, 17 Jul 2017 14:30:47 +0200
Subject: [PATCH] Use checked NonZero constructor in obligation forest
 NodeIndex
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… to remove an `unsafe` block.
---
 src/librustc_data_structures/obligation_forest/node_index.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc_data_structures/obligation_forest/node_index.rs b/src/librustc_data_structures/obligation_forest/node_index.rs
index 9fa6045146d..a72cc6b57ea 100644
--- a/src/librustc_data_structures/obligation_forest/node_index.rs
+++ b/src/librustc_data_structures/obligation_forest/node_index.rs
@@ -19,7 +19,7 @@ pub struct NodeIndex {
 impl NodeIndex {
     pub fn new(value: usize) -> NodeIndex {
         assert!(value < (u32::MAX as usize));
-        unsafe { NodeIndex { index: NonZero::new_unchecked((value as u32) + 1) } }
+        NodeIndex { index: NonZero::new((value as u32) + 1).unwrap() }
     }
 
     pub fn get(self) -> usize {