Add a test for #6976

Closes #6976

src/test/run-pass/deriving-in-macro.rs

@@ -0,0 +1,24 @@
+// Copyright 2012 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.
+
+#[feature(macro_rules)];
+
+macro_rules! define_vec (
+    () => (
+        mod foo {
+            #[deriving(Eq)]
+            pub struct bar;
+        }
+    )
+)
+
+define_vec!()
+
+pub fn main() {}