I think this is an example of how creating a hash and obtaining a reference to it is just as easy as creating a reference to an anonymous hash, but the first example has a bug ({...} should be (...)).
This:
my %hash = {
key1 => q{123},
key2 => q{456},
};
my $h_ref1 = \%hash;
...should be:
my %hash = (
key1 => q{123},
key2 => q{456},
);
my $h_ref1 = \%hash;
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