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Dplyr grouped column attribute causes "unknown column" error in unite() #159
Can't figure out if this is a bug in dplyr or a bug in tidyr. I think this bug tidyverse/dplyr#859 is related and may not have been fixed in tidyr even though filter now works fine. Sorry if this is already known, I couldn't find any other mentions of this issue.
Edit: It appears that
fixes the issue. However, the only thing this does is remove 'grouped_df' from the list of classes of the test object. Not sure if this is a bug at this point.