title: Issue in hash modification
body: <p>I am printing a hash <code>[ print Dumper($myhash); ]</code>, it is as below :</p>
  
  <pre><code>$VAR1= {
    'context_verdict' =&gt; 'Failed',
    'logfile' =&gt; 'abc',
    'Block_000' =&gt; {
       'Element_0032' =&gt; {
           'e_verdict' =&gt; 'FAILED',
           'e_name' =&gt; 'Element_0032',
           'e_log' =&gt; 'This is really bad...',
           'e_ref' =&gt; 'Good'
       }
    }
  </code></pre>
  
  <p>Now I want to change the value of logfile from abc to def. how to achieve this ?</p>
  
  <p>I wrote </p>
  
  <pre><code>$myhash{'$VAR1'}-&gt;{'logfile'}="def";
  </code></pre>
  
  <p>But it does not works!! It is still the "abc".</p>