rust/src/test/compile-fail/duplicate_entry_error.rs

// Copyright 2015 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.

// note-pattern: first defined in crate `std`.

// Test for issue #31788 and E0152

#![feature(lang_items)]

#[lang = "panic_fmt"]
fn panic_fmt() -> ! {
//~^ ERROR: duplicate lang item found: `panic_fmt`.
    loop {}
}

fn main() {}