Added a test to check that self can be used in a macro without having to be specified as an argument.

Author: joelself

src/test/run-pass/self-unhygienic.rs

@@ -0,0 +1,31 @@
+// 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.
+
+// Check that `self` is unhygienic
+
+struct A {
+    pub v: i64
+}
+
+macro_rules! pretty {
+    ( $t:ty, $field:ident ) => (
+        impl $t {
+            pub fn pretty(&self) -> String {
+                format!("<A:{}>", self.$field)
+            }
+        }
+    )
+}
+
+pretty!(A, v);
+
+fn main() {
+    assert_eq!(format!("Pretty: {}", A { v: 3 }.pretty()), "Pretty: <A:3>");
+}