Implemented IntoSendStr on SendStr to allow naming a

task with a `SendStr` directly

src/test/run-fail/fail-task-name-send-str.rs

@@ -0,0 +1,19 @@
+// 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.
+
+// error-pattern:task 'send name' failed at 'test'
+
+fn main() {
+    let mut t = ::std::task::task();
+    t.name("send name".to_send_str());
+    do t.spawn {
+        fail2!("test");
+    }
+}