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>perl -MO=Terse -e "print qq{Hello, world!\n};"
LISTOP (0x1ab0b04) leave [1]
...
        OP (0x1ab0b90) pushmark
        SVOP (0x1ab0be0) const  SPECIAL #0 Nullsv
-e syntax OK

>perl -MO=Concise -e "print qq{Hello, world!\n};"
6  <@> leave[t1] vKP/REFC ->(end)
...
3        <0> pushmark s ->4
4        <$> const(SPECIAL Null)[t2] s ->5
-e syntax OK

>perl -MO=Debug -e "print qq{Hello, world!\n};"
LISTOP (0x1bb2ec0)
...
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