libexpr: Avoid an unnecessary string copy in prim_derivationStrict

2018-02-17 16:54:21 +02:00
parent 66eeff3345
commit 37264ed0ad
1 changed files with 1 additions and 1 deletions
@@ -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) {