src/test/run-pass/pub-extern-privacy.rs

// Copyright 2014 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.

use std::mem::transmute;

mod a {
    extern {
        pub fn free(x: *const u8);
    }
}

pub fn main() {
    unsafe {
        a::free(transmute(0_usize));
    }
}