# main.pl
my @source = @{ $main::{ '_<' . __FILE__ } };
shift @source; # get rid of sub DB::DB{};
print for @source;


##</code><code>##

PERL5DB="sub DB::DB{}" perl -d main.pl


##</code><code>##

my @source = @{ $main::{ '_<' . __FILE__ } };
shift @source; # get rid of sub DB::DB{};
print for @source;