core: New closure syntax for comm.rs/task.rs docs

src/libcore/task.rs

@@ -17,7 +17,7 @@
  * # Example
  *
  * ~~~
- * spawn {||
+ * do spawn {
  *     log(error, "Hello, World!");
  * }
  * ~~~
@@ -434,7 +434,7 @@ fn spawn_listener<A:send>(+f: fn~(comm::port<A>)) -> comm::chan<A> {
      *
      *     let po = comm::port();
      *     let ch = comm::chan(po);
-     *     let ch = spawn_listener {|po|
+     *     let ch = do spawn_listener |po| {
      *         // Now the child has a port called 'po' to read from and
      *         // an environment-captured channel called 'ch'.
      *     };
@@ -529,7 +529,7 @@ fn get_task() -> task {
  * # Example
  *
  * ~~~
- * task::unkillable {||
+ * do task::unkillable {
  *     // detach / yield / destroy must all be called together
  *     rustrt::rust_port_detach(po);
  *     // This must not result in the current task being killed