Struct Access 

pub struct Access { /* private fields */ }

A source’s answer for one request. Its fields cannot be set by a reader.

What it holds is private and is whatever its source resolved; a reader asks it a question (can_read_document) and never looks inside.

The control for the two refusals below: the same path, used as intended, compiles and runs. Without it a wrong path would also “fail to compile”.

use haematite_cli::serve::access::{Access, Standalone, request};
let access: Result<Access, _> = request(&Standalone);
assert!(access.is_ok());

use haematite_cli::serve::access::Access;
let access = Access { denied_documents: None };

use haematite_cli::serve::access::Access;
let access: Access = Default::default();