Small updates to test cases.

src/test/run-fail/task-comm-14.rs

@@ -9,6 +9,9 @@ io fn main() {
         i = i - 1;
     }
 
+    // Spawned tasks are likely killed before they get a chance to send 
+    // anything back, so we deadlock here.
+
     i = 10;
     let int value = 0;
     while (i > 0) {

src/test/run-pass/task-comm-12.rs

@@ -11,7 +11,7 @@ fn start(int task_number) {
 
 fn test00() {    
     let int i = 0;
-    let task t = spawn thread start(i);
+    let task t = spawn thread "child" start(i);
 
     // Sleep long enough for the task to finish.
     _task.sleep(10000u);

src/test/run-pass/task-comm-15.rs

@@ -9,6 +9,10 @@ io fn start(chan[int] c, int n) {
 
 io fn main() {
     let port[int] p = port();
+    // Spawn a task that sends us back messages. The parent task
+    // is likely to terminate before the child completes, so from
+    // the child's point of view the receiver may die. We should
+    // drop messages on the floor in this case, and not crash!
     auto child = spawn thread "child" start(chan(p), 10);
     auto c <- p;
 }

src/test/run-pass/threads.rs

@@ -1,10 +1,9 @@
 // -*- rust -*-
 
 fn main() {
-  let port[int] p = port();
   let int i = 10;
   while (i > 0) {
-    spawn thread child(i);
+    spawn thread "child" child(i);
     i = i - 1;
   }
   log "main thread exiting";