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Hi Zdenek, > I thought I somewhere saw either implementation or at least proposal for > fold_buildN functions (that would be functionally equivalent to > fold (buildN (...)), but not requiring building of the tree node), > but now I cannot find it anywhere. > > Does this really exist? If not, does someone work on it? Yes, I've done that once. The effect in compile time was unmeasurable. I am attached my patch for you, but please don't expect it to be fully polished. Kazu Hirata
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