ansible [core 2.19.1]
  config file = None
  configured module search path = ['/home/username/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3/dist-packages/ansible
  ansible collection location = /home/username/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.13.7 (main, Aug 20 2025, 22:17:40) [GCC 14.3.0] (/usr/bin/python3)
  jinja version = 3.1.6
  pyyaml version = 6.0.2 (with libyaml v0.2.5)

{% import 'macros.j2' as macros with context %}
{{ macros.merge(cidrs=['10.0.0.0/32', '10.0.0.1/32']) }}

{% macro merge(cidrs=[]) %}
{{ cidrs | ansible.utils.cidr_merge }}
{% endmacro %}

TASK [template] **********************************************************************************************************************************
[ERROR]: Task failed: The filter plugin 'ansible.utils.cidr_merge' failed: Template.__new__() missing 1 required positional argument: 'source'

Task failed.
Origin: /tmp/test/test.yaml:5:7

3   gather_facts: no
4   tasks:
5     - template:
        ^ column 7

<<< caused by >>>

The filter plugin 'ansible.utils.cidr_merge' failed: Template.__new__() missing 1 required positional argument: 'source'
Origin: /tmp/test/template.j2

fatal: [localhost]: FAILED! => {"changed": false, "msg": "Task failed: The filter plugin 'ansible.utils.cidr_merge' failed: Template.__new__() missing 1 required positional argument: 'source'"}