c:\test>perl -MO=Concise -wle"print scalar( 1, 2, 3 );"
Useless use of a constant in void context at -e line 1.
8  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
7     <@> print vK ->8
3        <0> pushmark s ->4
-        <1> scalar sK/1 ->7
6           <@> list sK ->7             <<< And yet, there it is.
4              <0> pushmark v ->5
-              <0> ex-const v ->-
-              <0> ex-const v ->5
5              <$> const[IV 3] s ->6
-e syntax OK