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Which is exactly why I cannot understand why you are so keen on one binding model rather than the other, if it doesn't matter.  It looks like we are going to add is a feature that doesn't scale to advanced usages.  Moreover it seems really obvious that non-experts *will* get surprizes, because they *will* try to replace all their listcomps with genexprs -- they shouldn't do that, but of course they will do it anyway, because it appears to work -- until the occasional strange bug kreeps in, and one that is difficult to actually relate to the genexpr in the first place.