src/test/compile-fail/expanded-cfg.rs


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// Copyright 2016 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(rustc_attrs)]

macro_rules! mac {
    {} => {
        #[cfg(attr)]
        mod m {
            #[lang_item]
            fn f() {}
        }
    }
}

mac! {}

#[rustc_error]
fn main() {} //~ ERROR compilation successful