src/test/cli/crushtool/set-choose.t

    rule 0 (choose) num_rep 8 result size == 3:\t1024/1024 (esc)

and running 

    ../crushtool -c cli/crushtool/set-choose.crushmap.txt -o set-choose.crushmap ; ../crushtool -i set-choose.crushmap --show-bad-mappings --test 

shows a lot of bad mapping too.