forked from lix-project/lix
* Optimisation in the // operator: if one of the sets is empty, return
the other set.
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@ -750,13 +750,15 @@ void ExprOpImpl::eval(EvalState & state, Env & env, Value & v)
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void ExprOpUpdate::eval(EvalState & state, Env & env, Value & v)
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{
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Value v2;
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state.evalAttrs(env, e1, v2);
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state.cloneAttrs(v2, v);
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Value v1, v2;
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state.evalAttrs(env, e1, v1);
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state.evalAttrs(env, e2, v2);
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if (v1.attrs->size() == 0) { v = v2; return; }
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if (v2.attrs->size() == 0) { v = v1; return; }
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state.cloneAttrs(v1, v);
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foreach (Bindings::iterator, i, *v2.attrs) {
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Attr & a = (*v.attrs)[i->first];
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mkCopy(a.value, i->second.value);
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