rust/src/test/ui/duplicate-check-macro-exports.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.

#![feature(use_extern_macros)]

pub use std::panic;

#[macro_export]
macro_rules! panic { () => {} } //~ ERROR a macro named `panic` has already been exported

fn main() {}