libexpr: Avoid an unnecessary string copy in prim_derivationStrict
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@ -553,7 +553,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
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for (auto & i : args[0]->attrs->lexicographicOrder()) {
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if (i->name == state.sIgnoreNulls) continue;
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string key = i->name;
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const string & key = i->name;
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vomit("processing attribute '%1%'", key);
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auto handleHashMode = [&](const std::string & s) {
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