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# avoid-implicit
This rule identifies the use of dangerous implicit behaviors, often also
undocumented.
This rule will produce the following type of error messages:
- `avoid-implicit[copy-content]` is not a string as [copy](https://docs.ansible.com/ansible/latest/collections/ansible/builtin/copy_module.html#synopsis)
modules also accept these, but without documenting them.
## Problematic Code
```yaml
---
- name: Example playbook
hosts: localhost
tasks:
- name: Write file content
ansible.builtin.copy:
content: { "foo": "bar" } # <-- should use explicit jinja template
dest: /tmp/foo.txt
```
## Correct Code
```yaml
---
- name: Example playbook
hosts: localhost
tasks:
- name: Write file content
vars:
content: { "foo": "bar" }
ansible.builtin.copy:
content: "{{ content | to_json }}" # explicit better than implicit!
dest: /tmp/foo.txt
```
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