How to generate documentation for private items

Question

I have a project with:

main.rs
module_1/mod.rs
module_2/mod.rs
module_2/module_3/mod.rs

when I run cargo doc, I have just docu

Answer 1

This is because those modules are private, and the default behavior is to document public members only.

As of Rust 1.29.0, cargo doc supports --document-private-items, to document private items.

Before 1.29, rustdoc already supported the flag --document-private-items, which means you could generate documentation for your project using cargo rustdoc -- --document-private-items, but cargo doc did not support the flag.