test.pl

package MooseRole;
use Moose::Role;

sub dosomething {
    my ($field, %args) = @_;
    my $package = caller;
    use Data::Dumper;
    print Dumper $package->meta->get_attribute($field);
}

package MooseClass;
use Moose;

BEGIN {
    with 'MooseRole';
}

has 'something' => ( is => 'rw' );
dosomething 'something' => ( a => 1, b => 2 );

__PACKAGE__->meta->make_immutable;