$ perl -MO=Concise,-exec -e'@b = map { foo() } @a'
1  <0> enter
2  <;> nextstate(main 2 -e:1) v
3  <0> pushmark s
4  <0> pushmark s
5  <#> gv[*a] s
6  <1> rv2av[t6] lKM/1
7  <@> mapstart lK*/2
8  <|> mapwhile(other->9)[t7] lK/1
9      <0> pushmark s
a      <#> gv[*foo] s/EARLYCV
b      <1> entersub[t4] lKS/TARG,1
-      <@> scope lK
           goto 8
c  <0> pushmark s
d  <#> gv[*b] s
e  <1> rv2av[t2] lKRM*/1
f  <2> aassign[t8] vKS/COMMON
g  <@> leave[1 ref] vKP/REFC
-e syntax OK