1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/compile-fail/proc-macro/shadow.rs b/src/test/compile-fail/proc-macro/shadow.rs
new file mode 100644
index 00000000000..9bff1c57ae4
--- /dev/null
+++ b/src/test/compile-fail/proc-macro/shadow.rs
@@ -0,0 +1,18 @@
+// 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.
+
+// aux-build:derive-a.rs
+
+#[macro_use]
+extern crate derive_a;
+#[macro_use]
+extern crate derive_a; //~ ERROR the name `derive_a` is defined multiple times
+
+fn main() {}