fa8e71a825
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>`.