Now I think we might be getting somewhere (well, I think. I haven't been following all the threads here. We must be rapidy approching 200+). I know I've been confused, because sometimes you talk about implicit concurrency. But your statement "If he didn't want that to happen, he would not have placed them either side of a non-serialising operator" implies we are talking about explicit concurrency.
And that makes most of the discussion we've been having moot. (I'm sure you'll disagree, but an explicit concurrency operator is really an "undefine the evaluation order" operator for these expressions)
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