I haven't read the Friedman/Wise paper. Most likely those were futures? They were doing FP work around then, like https://help.luddy.indiana.edu/techreports/TRN

I haven't read the Friedman/Wise paper. Most likely those were futures? They were doing FP work around then, like https://help.luddy.indiana.edu/techreports/TRNNN.cgi?trnum=TR44 https://help.luddy.indiana.edu/techreports/TRNNN.cgi?trnum=T... (I seem to remember reading another paper of theirs which included racing suspensions till one of them completed, which would be more like futures than the streams of this paper. But if so I'm forgetting where.) I get the impression E promises had a nicer design than JS's for handling errors -- but that's also a vague memory and I never really learned JS's.