Add regression test

src/test/compile-fail/macro-use-scope.rs

@@ -8,12 +8,25 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(rustc_private)]
-macro_rules! m {
-    () => { #[macro_use] extern crate syntax; }
+// aux-build:two_macros.rs
+
+#![feature(rustc_attrs)]
+#![allow(unused)]
+
+fn f() {
+    let _ = macro_one!();
 }
+#[macro_use(macro_one)] // Check that this macro is usable in the above function
+extern crate two_macros;
+
+macro_rules! m { () => {
+    fn g() {
+        macro_two!();
+    }
+    #[macro_use(macro_two)] // Check that this macro is usable in the above function
+    extern crate two_macros as _two_macros;
+} }
 m!();
 
-fn main() {
-    help!(); //~ ERROR unexpected end of macro invocation
-}
+#[rustc_error]
+fn main() {} //~ ERROR compilation successful