src/test/ui/associated-const/associated-const-private-impl.rs

mod bar1 {
    pub use self::bar2::Foo;
    mod bar2 {
        pub struct Foo;

        impl Foo {
            const ID: i32 = 1;
        }
    }
}

fn main() {
    assert_eq!(1, bar1::Foo::ID);
    //~^ERROR associated constant `ID` is private
}