in reply to Add Data to Hash Reference

You need to specifically create hash reference. Here is better code that prints your new hash. Note: Now dumpvar puts out data but also print another hash with undef value. I believe that is due to auto-vivification but I could be wrong. 
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;


my %test = { record => ' ' };
my $test = \%test;

$test->{record}->{'a'} = 11;
$test->{record}->{'b'} = 22;
print Dumper \%test;

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Re^2: Add Data to Hash Reference
by Anonymous Monk on Dec 07, 2010 at 21:10 UTC
    This produces: 

    Reference found where even-sized list expected at ./875882.pl line 7.
$VAR1 = {
          'record' => {
                        'a' => 11,
                        'b' => 22
                      },
          'HASH(0x604290)' => undef
        };

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    If you had read the warning, you'd have realized that there's something wrong with the line 

    my %test = { record => ' ' };

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