Thank you John and Paul, I find this debate really interesting. > hi was clearly written before lo This is not my understanding of the memory model : because the channels are buffered, I can't really infer the "happens-before" relationship between the reading event of the channels. And even if the relationship holds locally in the writing side, it has no strong implication on what other goroutines can see. I would say the hi and lo communications happen concurrently, hence the "wrong" results once in a while.
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