src/test/ui/lint/unreachable_pub.rs

// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// compile-pass

#![feature(crate_visibility_modifier)]

#![allow(unused)]
#![warn(unreachable_pub)]

mod private_mod {
    // non-leaked `pub` items in private module should be linted
    pub use std::fmt;
    pub use std::env::{Args}; // braced-use has different item spans than unbraced

    pub struct Hydrogen {
        // `pub` struct fields, too
        pub neutrons: usize,
        // (... but not more-restricted fields)
        crate electrons: usize
    }
    impl Hydrogen {
        // impls, too
        pub fn count_neutrons(&self) -> usize { self.neutrons }
        crate fn count_electrons(&self) -> usize { self.electrons }
    }

    pub enum Helium {}
    pub union Lithium { c1: usize, c2: u8 }
    pub fn beryllium() {}
    pub trait Boron {}
    pub const CARBON: usize = 1;
    pub static NITROGEN: usize = 2;
    pub type Oxygen = bool;

    macro_rules! define_empty_struct_with_visibility {
        ($visibility: vis, $name: ident) => { $visibility struct $name {} }
    }
    define_empty_struct_with_visibility!(pub, Fluorine);

    extern {
        pub fn catalyze() -> bool;
    }

    // items leaked through signatures (see `get_neon` below) are OK
    pub struct Neon {}

    // crate-visible items are OK
    crate struct Sodium {}
}

pub mod public_mod {
    // module is public: these are OK, too
    pub struct Magnesium {}
    crate struct Aluminum {}
}

pub fn get_neon() -> private_mod::Neon {
    private_mod::Neon {}
}

fn main() {
    let _ = get_neon();
}