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Any Perl 5 programmer who's worked with Perl 5 more than a few months has learned about how invaluable the Data::Dumper module is. The ability to say

use Data::Dumper;
print Dumper( \%hash );

is a godsend to debugging data structures of any complexity.

Perl 6 has this dumping built in.

uniqua:~/rakudo/lab $ cat dumper
#!/usr/local/bin/perl6

use v6;

my %hash = (
    'this'     => 'that',
    'year'     => 2112,
    'matcher'  => regex { ^ M(r|rs|s)\. \s+ (\w+) \s+ Wall $ },
    'rational' => 0.5,
    'num'      => (0.5).Num,
);

say %hash.perl;
# Or %hash.perl.say

uniqua:~/rakudo/lab $ ./dumper
{"num" => 0.5, "this" => "that", "year" => 2112,
"rational" => 1/2, "matcher" => { ... }}

Regex dumping does not display the actual regex yet, but Patrick Michaud says it's coming soon.