You didn't show how are you adding element into $debug{stack} in testStack, but if $ptr contains reference to %debug, you can do it as follows: 

push @{$ptr->{stack}}, $new_elem;
$ptr->{stack}[7] = $new_value;

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Also see References quick reference.

In reply to Re: How do I add entries to a hash array in a different scope? by zwon
in thread How do I add entries to a hash array in a different scope? by SQADude

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