+// Copyright 2018 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.
+
+// aux-build:macro-use-warned-against.rs
+// aux-build:macro-use-warned-against2.rs
+// compile-pass
+
+#![warn(rust_2018_idioms, unused)]
+#![feature(use_extern_macros)]
+
+#[macro_use] //~ WARN should be replaced at use sites with a `use` statement
+extern crate macro_use_warned_against;
+#[macro_use] //~ WARN unused `#[macro_use]`
+extern crate macro_use_warned_against2;
+
+fn main() {
+ foo!();
+}