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$ perl -MO=Concise,-exec -e'use constant { C => 42 }; print C;'
1  <0> enter
...
5  <@> print vK
6  <@> leave[1 ref] vKP/REFC
-e syntax OK

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$ perl -MO=Concise,-exec -e'sub C { 42 } print C;'
1  <0> enter
...
7  <@> print vK
8  <@> leave[1 ref] vKP/REFC
-e syntax OK