>perl -MO=Concise -e"$x = \1"
6  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
5     <2> sassign vKS/2 ->6
3        <$> const[RV \1] s ->4             <-----
-        <1> ex-rv2sv sKRM*/1 ->5
4           <#> gvsv[*x] s ->5
-e syntax OK