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use Data::Dumper;
use strict;
...
my $data = {"a" => 1};
$data->{"b"}->{"b"}->{"b"}->{"b"};#useless use of hash element in void
+ context? interesting error message. The useless use is actually not 
+that useless.
print Dumper($data);

$VAR1 = {
          'a' => 1,
...
                          }
                 }
        };