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my @v :Nonempty = keys %h;

#!/usr/bin/perl
use warnings;
...
my @keys_ok :Nonempty = keys %hash_ok;

my @keys_empty :Nonempty = keys %hash_empty;

    use Data::Dumper;

...
        warn Dumper('clear', \@_);
        shift->SUPER::CLEAR(@_)
    }

    sub SPLICE {
        my $self = shift;
...
        croak "Cannot be empty" if 1 == @$self;
        $self->SUPER::POP(@_)
    }

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,