rust/src/test/compile-fail/required-lang-item.rs

// Copyright 2013 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(lang_items, no_std)]
#![no_std]

#[lang="phantom_fn"]
pub trait PhantomFn<T:?Sized> { }
impl<T:?Sized, U:?Sized> PhantomFn<T> for U { }

#[lang="sized"] pub trait Sized : PhantomFn<Self> {}

// error-pattern:requires `start` lang_item

fn main() {}