To my knowledge, it's not really a cv at all, it's just the root op of the optree. The best I can suggest is main_root: 

use B 'main_root';
use B::Deparse;

my $deparse = B::Deparse->new();
print $deparse->( main_root, 0 );

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In reply to Re: Getting a code ref to main by chromatic
in thread Getting a code ref to main by diotalevi

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