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"microthreads", channels, and the select statement predate go at least by a couple of decades in Alef, Plan9's libthread, Limbo, Newsqueak, etc.

They go back to Occam and Modula-2, among others, way before your list.

"at least" is there for a reason.

Well, given that you only listed projects where Rob Pike worked on, I wasn't sure what else covered by your "at least".