-> is omittable in Perl in some situations

comment.md

The output may be like this:

value_2_1
value_2_1

It is because -> is omittable when it's between [ ] or { }.

perl_behavior.pl

#! /usr/bin/perl

my %hash_1 = (
    attr1 => "value1",
    attr2 => {attr_2_1 => "value_2_1", attr_2_2 => "value_2_2"},
);

print $hash_1{attr2}->{attr_2_1} . "\n";
print $hash_1{attr2}{attr_2_1} . "\n";