From 37264ed0ad898cdd6880de8ce6e5dda7977eed5f Mon Sep 17 00:00:00 2001
From: Tuomas Tynkkynen <tuomas@tuxera.com>
Date: Fri, 16 Feb 2018 05:13:39 +0200
Subject: [PATCH] libexpr: Avoid an unnecessary string copy in
prim_derivationStrict
---
src/libexpr/primops.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index f6c34d525..a800d2429 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -553,7 +553,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
for (auto & i : args[0]->attrs->lexicographicOrder()) {
if (i->name == state.sIgnoreNulls) continue;
- string key = i->name;
+ const string & key = i->name;
vomit("processing attribute '%1%'", key);
auto handleHashMode = [&](const std::string & s) {
--
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