Support multiple item macros

Closes #4375

src/test/compile-fail/macro-incomplete-parse.rs

@@ -13,7 +13,8 @@
 macro_rules! ignored_item {
     () => {
         fn foo() {}
-        fn bar() {} //~ ERROR macro expansion ignores token `fn`
+        fn bar() {}
+        , //~ ERROR macro expansion ignores token `,`
     }
 }
 

src/test/run-pass/macro-multiple-items.rs

@@ -0,0 +1,29 @@
+// 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.
+
+// xfail-pretty - token trees can't pretty print
+
+#[feature(macro_rules)];
+
+macro_rules! make_foo(
+    () => (
+        struct Foo;
+
+        impl Foo {
+            fn bar(&self) {}
+        }
+    )
+)
+
+make_foo!()
+
+pub fn main() {
+    Foo.bar()
+}