Function case_json_object 

pub fn case_json_object<'a, T: 'a>(
    x0: Box<dyn Fn(&'a Map<String, Value>) -> Result<T, Error> + 'a>,
) -> Box<dyn FnOnce(&'a Value) -> Result<T, Error> + 'a>

Parse a JSON Object and its fields LamVal Json builtin