From f0c9a9f4749c8db719d2913c3c7619665db1c0c2 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <nnethercote@mozilla.com>
Date: Fri, 18 Nov 2016 10:10:09 +1100
Subject: [PATCH] Don't clone in UnificationTable::probe().

This speeds up compilation of rustc-benchmarks/inflate-0.1.0 by 1%.
---
 src/librustc_data_structures/unify/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc_data_structures/unify/mod.rs b/src/librustc_data_structures/unify/mod.rs
index 1f4d09a92247e..e2d3a4f453749 100644
--- a/src/librustc_data_structures/unify/mod.rs
+++ b/src/librustc_data_structures/unify/mod.rs
@@ -344,7 +344,7 @@ impl<'tcx, K, V> UnificationTable<K>
     }
 
     pub fn probe(&mut self, a_id: K) -> Option<V> {
-        self.get(a_id).value.clone()
+        self.get(a_id).value
     }
 
     pub fn unsolved_variables(&mut self) -> Vec<K> {