>perl -MO=Concise -e"($a,$b)=(4,5)"
a  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
9     <2> aassign[t3] vKS ->a
-        <1> ex-list lKP ->6           <-- RHS list
3           <0> pushmark s ->4
4           <$> const[IV 4] s ->5
5           <$> const[IV 5] s ->6
-        <1> ex-list lKPRM* ->9        <-- LHS list w/ "M"
6           <0> pushmark sRM* ->7
-           <1> ex-rv2sv sKRM*/1 ->8
7              <#> gvsv[*a] s ->8
-           <1> ex-rv2sv sKRM*/1 ->-
8              <#> gvsv[*b] s ->9
-e syntax OK