// 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 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. #![feature(rustc_attrs)] macro_rules! null { ($i:tt) => {} } macro_rules! apply_null { ($i:item) => { null! { $i } } } #[rustc_error] fn main() { //~ ERROR compilation successful apply_null!(#[cfg(all())] fn f() {}); }