Added test for attributes on parens hir folder

Author: Kimundi

src/test/compile-fail/expr_attr_paren_order.rs

@@ -0,0 +1,34 @@
+// Copyright 2015 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.
+
+#![feature(stmt_expr_attributes)]
+
+fn main() {
+
+    // Test that attributes on parens get concatenated
+    // in the expected order in the hir folder.
+
+    #[deny(non_snake_case)] (
+        #![allow(non_snake_case)]
+        {
+            let X = 0;
+            let _ = X;
+        }
+    );
+
+    #[allow(non_snake_case)] (
+        #![deny(non_snake_case)]
+        {
+            let X = 0; //~ ERROR snake case name
+            let _ = X;
+        }
+    );
+
+}