Another test for col_kept.
Another test for col_kept.

fplll/fplll,cr-marcstevens/fplll,cr-marcstevens/fplll,cr-marcstevens/fplll,dstehle/fplll,dstehle/fplll,fplll/fplll,cr-marcstevens/fplll,fplll/fplll,dstehle/fplll,fplll/fplll,fplll/fplll