packer/command/test-fixtures/hcl2_upgrade/variables-with-variables/input.json

{
    "variables": {
        "aws_region": null,
        "aws_secondary_region": "{{ user `aws_region` }}",
        "aws_secret_key": "",
        "aws_access_key": "",
        "password": "{{ user `aws_secret_key` }}-{{ user `aws_access_key` }}"
    },
    "sensitive-variables": [
        "aws_secret_key",
        "aws_access_key",
        "password"
    ]
}