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>perl -MO=Concise -e"f()" 2>&1 | find "entersub"
5     <1> entersub[t2] vKS/TARG,1 ->6
...
                          ^
                          |
                          unknown at compile-time

>perl -MO=Concise -e"'foo'"
3  <@> leave[1 ref] vKP/REFC ->(end)
...
-     <0> ex-const v ->3                  <-- The constant in void
-e syntax OK                                  context was removed
                                              from the execution path.