Add a test case for accidental macro re-export

Author: Keegan McAllister

src/test/auxiliary/macro_non_reexport_2.rs

@@ -0,0 +1,19 @@
+// Copyright 2015 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.
+
+#![crate_type = "dylib"]
+
+// Since we load a serialized macro with all its attributes, accidentally
+// re-exporting a `#[macro_export] macro_rules!` is something of a concern!
+//
+// We avoid it at the moment only because of the order in which we do things.
+
+#[macro_use] #[no_link]
+extern crate macro_reexport_1;

src/test/compile-fail/macro-no-implicit-reexport.rs

@@ -0,0 +1,20 @@
+// Copyright 2015 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_reexport_1.rs
+// aux-build:macro_non_reexport_2.rs
+// ignore-stage1
+
+#[macro_use] #[no_link]
+extern crate macro_non_reexport_2;
+
+fn main() {
+    assert_eq!(reexported!(), 3u);  //~ ERROR macro undefined
+}