src/test/ui/macro_backtrace/auxiliary/ping.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.

// Test that the macro backtrace facility works (supporting file)

// a non-local macro
#[macro_export]
macro_rules! ping {
    () => {
        pong!();
    }
}

#[macro_export]
macro_rules! deep {
    () => {
        foo!();
    }
}

#[macro_export]
macro_rules! foo {
    () => {
        bar!();
    }
}

#[macro_export]
macro_rules! bar {
    () => {
        ping!();
    }
}