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    $ perl -MO=Deparse,-p -e 'sub foo {} sub bar {} bar & foo()'
    sub foo {
...
    }
    bar(&foo());
    -e syntax OK

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    perl -MO=Deparse,-p -e 'sub foo {} sub bar {} &bar & &foo()'
    sub foo {
...
    
    }
    (&bar & &foo());