[
    {
        "name": "adult_age",
        "rules": ["positive_integer", {"min_number": 18}]
    },

    {
        "name": "adult_age_with_custom_error",
        "rules": ["positive_integer", {"min_number": 18}],
        "error": "WRONG_AGE"
    },

    {
        "name": "user",
        "rules": { "nested_object":{
            "name": "required",
            "age1": "adult_age",
            "age2": "adult_age_with_custom_error"
        }}
    },

    {
        "name": "user_with_custom_error",
        "rules": { "nested_object":{
            "name": "required",
            "age1": "adult_age",
            "age2": "adult_age_with_custom_error"
        }},
        "error": "WRONG_USER"
    }
]