Test that box syntax, both in expressions and patterns, is caught by

feature gate net.

fix typo in my feature-gate-box-expr.rs test.

src/test/compile-fail/feature-gate-box-expr.rs

@@ -0,0 +1,23 @@
+// 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.
+
+fn main() {
+    use std::boxed::HEAP;
+
+    let x = box 'c'; //~ ERROR box expression syntax is experimental in alpha release
+    println!("x: {}", x);
+
+    let x = box () 'c'; //~ ERROR box expression syntax is experimental in alpha release
+    println!("x: {}", x);
+
+    let x = box (HEAP) 'c'; //~ ERROR box expression syntax is experimental in alpha release
+    println!("x: {}", x);
+}
+

src/test/compile-fail/feature-gate-box-pat.rs

@@ -0,0 +1,14 @@
+// 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.
+
+fn main() {
+    let box x = Box::new('c'); //~ ERROR box pattern syntax is experimental in alpha release
+    println!("x: {}", x);
+}