>perl -MO=Concise -e"@in=@in[@idx]
e  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
d     <2> aassign[t7] vKS/COMMON ->e        <-- Note "COMMON"
-        <1> ex-list lK ->a
3           <0> pushmark s ->4
9           <@> aslice lK ->a
4              <0> pushmark s ->5
6              <1> rv2av[t6] lK/1 ->7
5                 <#> gv[*idx] s ->6
8              <1> rv2av[t4] sKR/1 ->9
7                 <#> gv[*in] s ->8
-        <1> ex-list lK ->d
a           <0> pushmark s ->b
c           <1> rv2av[t2] lKRM*/1 ->d
b              <#> gv[*in] s ->c