// 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. // aux-build:attr_proc_macro.rs #![feature(use_extern_macros)] extern crate attr_proc_macro; use attr_proc_macro::attr_proc_macro; #[attr_proc_macro] //~^ ERROR: attribute procedural macros are experimental struct Foo; fn main() { let _ = Foo; }