You only need to make 2 minor adjustments.
First, change $dh->read_pl() to $dh->read

Then fix the @ISA assignment by using parent.

#!/usr/bin/perl

use strict;
use warnings;
use autodie;
use IO::Dir;

my $dh = IO::Dir::pl->new('.');

while (my $file_name = $dh->read){
    print STDOUT "$file_name\n";
}

package IO::Dir::pl;
use parent -norequire, qw(IO::Dir);

sub read{
    my $self = shift;
    warn "Ok We got here.\n";
    return undef;
}

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In reply to Re: My first attempt at inheritance by Anonymous Monk
in thread My first attempt at inheritance by BillKSmith

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