a  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 4 test.pl:3) v ->3
-     <1> null vK/1 ->a
6        <|> cond_expr(other->7) vK/1 ->b
5           <1> shift sK/1 ->6
4              <1> rv2av[t2] sKRM/1 ->5
3                 <#> gv[*ARGV] s ->4
-           <@> scope vK ->-
-              <0> ex-nextstate v ->7
9              <@> print vK ->a
7                 <0> pushmark s ->8
8                 <$> const[PV "Hello World"] s ->9
g           <@> leave vKP ->a
b              <0> enter v ->c
c              <;> nextstate(main 2 test.pl:7) v ->d
f              <@> print vK ->g
d                 <0> pushmark s ->e
e                 <$> const[PV "Goodbye World"] s ->f