src/test/ui/privacy/pub-priv-dep/pub-priv1.rs

// aux-crate:priv:priv_dep=priv_dep.rs
// aux-build:pub_dep.rs
#![deny(exported_private_dependencies)]

// This crate is a private dependency
extern crate priv_dep;
// This crate is a public dependency
extern crate pub_dep;

use priv_dep::{OtherTrait, OtherType};
use pub_dep::PubType;

// Type from private dependency used in private
// type - this is fine
struct PrivateType {
    field: OtherType,
}

pub struct PublicType {
    pub field: OtherType,
    //~^ ERROR type `OtherType` from private dependency 'priv_dep' in public interface
    priv_field: OtherType,    // Private field - this is fine
    pub other_field: PubType, // Type from public dependency - this is fine
}

impl PublicType {
    pub fn pub_fn(param: OtherType) {}
    //~^ ERROR type `OtherType` from private dependency 'priv_dep' in public interface

    fn priv_fn(param: OtherType) {}
}

pub trait MyPubTrait {
    type Foo: OtherTrait;
}
//~^^ ERROR trait `OtherTrait` from private dependency 'priv_dep' in public interface

pub struct AllowedPrivType {
    #[allow(exported_private_dependencies)]
    pub allowed: OtherType,
}

fn main() {}