$ perl -MO=Concise,-exec -e'use subs qw( time ); time()'
1  <0> enter
2  <;> nextstate(main 12 -e:1) v
3  <0> pushmark s
4  <#> gv[*time] s                      <-- sub name
5  <1> entersub[t2] vKS/TARG,1          <-- sub invocation
6  <@> leave[1 ref] vKP/REFC
-e syntax OK