public void LambdaLifting(ITreeNode node, CachedValue cachedValue)
{
// no
var str1 = cachedValue.GetOrCreate(() => node.ToString());
var str2 = cachedValue.GetOrCreate2(() => node.ToString());
// yes
var str3 = cachedValue.GetOrCreate3(() => node.ToString());
var str4 = cachedValue.GetOrCreate4(() => node.ToString());
}