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$ perl -f -MO=Concise -e " my$f=[ 1, [ 2, [ 3 ] ] ]; my$g={ a => { b=> + { c=> {}, }, }, }; " s <@> leave[1 ref] vKP/REFC ->(end) 1 <0> enter ->2 ... l <0> pushmark s ->m q <0> padsv[$g:2,3] sRM*/LVINTRO ->r -e syntax OK