B::Concise is even more definitive since it shows very accurate information about the opcodes (whereas B::Deparse synthesizes a Perl code approximation). 

$ perl -MO=Concise,-exec -e'use constant { C => 42 }; print C;'
1  <0> enter
2  <;> nextstate(main 187 -e:1) v:{
3  <0> pushmark s
4  <$> const[IV 42] s*/FOLD
5  <@> print vK
6  <@> leave[1 ref] vKP/REFC
-e syntax OK

[download]

Compare to a sub call: 

$ perl -MO=Concise,-exec -e'sub C { 42 } print C;'
1  <0> enter
2  <;> nextstate(main 3 -e:1) v:{
3  <0> pushmark s
4  <0> pushmark s
5  <#> gv[IV \] s
6  <1> entersub lKS
7  <@> print vK
8  <@> leave[1 ref] vKP/REFC
-e syntax OK

[download]

In reply to Re^2: Are "use constant" constants really inlined? by ikegami
in thread Are "use constant" constants really inlined? by Darkwing

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