Cargo.lock

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3

[[package]]
name = "clippy-test"
version = "0.1.0"

Cargo.toml

[package]
name = "clippy-test"
version = "0.1.0"
edition = "2018"

[lib]
name = "clippy_test"
path = "src/lib.rs"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]

lib.rs

// src/lib.rs

#![deny(clippy::print_stdout)]

pub mod foo;

main.rs

// src/main.rs

fn main() {
    clippy_test::foo::foo();
}

mod.rs

// src/foo/mod.rs

// #![deny(clippy::print_stdout)] works
pub fn foo() {
    println!("hmm");
}