Background: http://esdiscuss.org/topic/next-yo-in-newborn-generators http://esdiscuss.org/topic/april-8-2014-meeting-notes
It appears that the current state of affairs is that the argument supplied to the first call of `next` on a newborn generator is "ignored and inaccessibe". Clearly, this means that there are some iterators which cannot be expressed as a generator (namely, any iterator that echoes back it's `next` arguments). It seems like there should be parity here. More concretely, the fact that information can be passed into generators means that they can be used to create data sinks. Since that first input is inaccessible, however, this use case is made more awkward than it needs to be; the consumer has to artificially "pump" the generator to get past that first (useless) `next`. Is there any way that the generator function can have access to that lost data? Thanks!
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