Load macros from external modules

src/test/compile-fail/phase-syntax-doesnt-resolve.rs

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+// Copyright 2013 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_crate_test.rs
+// xfail-stage1
+
+#[feature(phase)];
+
+#[phase(syntax)]
+extern mod macro_crate_test;
+
+fn main() {
+    macro_crate_test::foo();
+    //~^ ERROR unresolved name
+    //~^^ ERROR use of undeclared module `macro_crate_test`
+    //~^^^ ERROR unresolved name `macro_crate_test::foo`.
+}