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$ perl -MO=Concise,-exec -e'{}' 1 <0> enter ... 4 <@> anonhash vK* 5 <@> leave[1 ref] vKP/REFC -e syntax OK
$ perl -MO=Concise,-exec -e'tied sub {}->()' 1 <0> enter ... 9 <1> tied vK/1 a <@> leave[1 ref] vKP/REFC -e syntax OK