>perl -MO=Concise -e"require strict; print 'a'"
9  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
4     <1> require sK/1 ->5
3        <$> const[PV "strict.pm"] s/BARE ->4
5     <;> nextstate(main 1 -e:1) v ->6
8     <@> print vK ->9
6        <0> pushmark s ->7
7        <$> const[PV "a"] s ->8
-e syntax OK