Allow fail messages to be caught, and introduce the Any trait

Some code cleanup, sorting of import blocks

Removed std::unstable::UnsafeArc's use of Either

Added run-fail tests for the new FailWithCause impls

Changed future_result and try to return Result<(), ~Any>.

- Internally, there is an enum of possible fail messages passend around.
- In case of linked failure or a string message, the ~Any gets
  lazyly allocated in future_results recv method.
- For that, future result now returns a wrapper around a Port.
- Moved and renamed task::TaskResult into rt::task::UnwindResult
  and made it an internal enum.
- Introduced a replacement typedef `type TaskResult = Result<(), ~Any>`.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/libextra/test.rs b/src/libextra/test.rs
index 457f7868e23..070108ddf2e 100644
--- a/src/libextra/test.rs
+++ b/src/libextra/test.rs
@@ -873,8 +873,7 @@ pub fn run_test(force_ignore: bool,
             task.spawn(testfn_cell.take());
 
             let task_result = result_future.recv();
-            let test_result = calc_result(&desc,
-                                          task_result == task::Success);
+            let test_result = calc_result(&desc, task_result.is_ok());
             monitor_ch.send((desc.clone(), test_result));
         }
     }