From a17c8d9b912965a11b9291b21a1b9e417893de33 Mon Sep 17 00:00:00 2001
From: Benjamin Murphy <benjamin_murphy@me.com>
Date: Thu, 31 Mar 2016 10:45:14 -0400
Subject: SERVER-23444 Fixed pessimizing move.

---
 src/mongo/db/matcher/expression_tree.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mongo/db/matcher/expression_tree.h b/src/mongo/db/matcher/expression_tree.h
index 50786402a85..1e751f0f98c 100644
--- a/src/mongo/db/matcher/expression_tree.h
+++ b/src/mongo/db/matcher/expression_tree.h
@@ -68,7 +68,7 @@ public:
     virtual std::unique_ptr<MatchExpression> releaseChild(size_t i) {
         auto child = std::unique_ptr<MatchExpression>(_expressions[i]);
         _expressions[i] = nullptr;
-        return std::move(child);
+        return child;
     }
 
     virtual std::vector<MatchExpression*>* getChildVector() {
-- 
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