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$ perl -MO=Concise -e 'print "foo!\n"'
6  <@> leave[1 ref] vKP/REFC ->(end)
...
3        <0> pushmark s ->4
4        <$> const[PV "foo!\n"] s ->5
-e syntax OK

$ perl -MO=Concise,-exec -e 'print "foo!\n"'
1  <0> enter 
...
5  <@> print vK
6  <@> leave[1 ref] vKP/REFC
-e syntax OK