Remove linked failure from the runtime

The reasons for doing this are:

* The model on which linked failure is based is inherently complex
* The implementation is also very complex, and there are few remaining who
  fully understand the implementation
* There are existing race conditions in the core context switching function of
  the scheduler, and possibly others.
* It's unclear whether this model of linked failure maps well to a 1:1 threading
  model

Linked failure is often a desired aspect of tasks, but we would like to take a
much more conservative approach in re-implementing linked failure if at all.

Closes #8674
Closes #8318
Closes #8863

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/rand/os.rs b/src/libstd/rand/os.rs
index 60fc1e0c6bc..cd90af113ec 100644
--- a/src/libstd/rand/os.rs
+++ b/src/libstd/rand/os.rs
@@ -162,7 +162,7 @@ mod test {
         for _ in range(0, 20) {
             let (p, c) = comm::stream();
             chans.push(c);
-            do task::spawn_with(p) |p| {
+            do task::spawn {
                 // wait until all the tasks are ready to go.
                 p.recv();