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As an experienced
data.tableuser, I can generally recognize the cause of the:=error messageHowever, (a) it still takes a bit of work, and (b) it doesn't fully diagnose the problem, even though it's possible. The following is a proof-of-concept that provides slightly better advice for the common error of providing an update expression to
i =instead ofj =.Obviously the performance is irrelevant as it is only going to error at this point.
Created on 2020-02-03 by the reprex package (v0.3.0)