Add regression test.

src/test/run-pass-fulldeps/proc-macro/auxiliary/double.rs

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+// 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.
+
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+#![feature(proc_macro)]
+#![feature(proc_macro_lib)]
+
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+
+#[proc_macro_derive(Double)]
+pub fn derive(input: TokenStream) -> TokenStream {
+    format!("mod foo {{ {} }}", input.to_string()).parse().unwrap()
+}

src/test/run-pass-fulldeps/proc-macro/crate-var.rs

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+// 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:double.rs
+
+#![feature(proc_macro)]
+#![allow(unused)]
+
+#[macro_use]
+extern crate double;
+
+struct Foo;
+
+macro_rules! m { () => {
+    #[derive(Double)]
+    struct Bar($crate::Foo);
+} }
+m!();
+
+fn main() {}