Add failure tests for moving out of unboxed closure environments

src/test/compile-fail/unboxed-closure-illegal-move.rs

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+// Copyright 2014 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(unboxed_closures)]
+
+// Tests that we can't move out of an unboxed closure environment
+// if the upvar is captured by ref or the closure takes self by
+// reference.
+
+fn main() {
+    // By-ref cases
+    {
+        let x = box 0u;
+        let f = |&:| drop(x); //~ cannot move
+    }
+    {
+        let x = box 0u;
+        let f = |&mut:| drop(x); //~ cannot move
+    }
+    {
+        let x = box 0u;
+        let f = |:| drop(x); //~ cannot move
+    }
+    // By-value cases
+    {
+        let x = box 0u;
+        let f = move |&:| drop(x); //~ cannot move
+    }
+    {
+        let x = box 0u;
+        let f = move |&mut:| drop(x); //~ cannot move
+    }
+    {
+        let x = box 0u;
+        let f = move |:| drop(x); // this one is ok
+    }
+}