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package Foo {
use Moo;
has a => (is => "ro");
has b => (is => "ro");
}
my $bar = Foo->new(a => 42);
# Print only 'a'
say $_ for keys %{ $bar }
# Print all attributes
say $_ for keys( %{
'Moo'->_constructor_maker_for('Foo')->all_attribute_specs
});
