repeat function using for_each argument doesn't work as documented in heat template

Issue

• The repeat function using for_each argument does not work correctly.
• More information on the function can be found here: http://docs.openstack.org/developer/heat/template_guide/hot_spec.html

[root@undercloud ~]# heat stack-create -f b.yaml s5
ERROR: The values of the "for_each" argument to "repeat" must be lists
[root@undercloud ~]# cat b.yaml 
heat_template_version: 2015-04-30

parameters:
  ports:
    type: comma_delimited_list
    label: ports
    default: "80,443,8080"

resources:
  security_group:
    type: OS::Neutron::SecurityGroup
    properties:
      name: web_server_security_group
      rules:
        repeat:
          for_each:
            <%port%>: { get_param: ports }
          template:
            protocol: tcp
            port_range_min: <%port%>
            port_range_max: <%port%>

[root@undercloud ~]# heat stack-create -f b.yaml s5
ERROR: The values of the "for_each" argument to "repeat" must be lists