Remove unused imports throughout src/

src/libcore/task/local_data.rs

@@ -29,7 +29,6 @@ magic.
 use prelude::*;
 use task::local_data_priv::{local_get, local_pop, local_modify, local_set};
 use task::rt;
-use task;
 
 /**
  * Indexes a task-local data slot. The function's code pointer is used for

src/libcore/task/mod.rs

@@ -33,22 +33,14 @@
  * ~~~
  */
 
-use cast;
 use cell::Cell;
-use cmp;
 use cmp::Eq;
-use iter;
-use libc;
 use option;
 use result::Result;
 use comm::{stream, Chan, GenericChan, GenericPort, Port, SharedChan};
-use pipes;
 use prelude::*;
-use ptr;
 use result;
-use task::local_data_priv::{local_get, local_set};
 use task::rt::{task_id, sched_id, rust_task};
-use task;
 use util;
 use util::replace;
 

src/libcore/task/spawn.rs

@@ -77,14 +77,12 @@ use cell::Cell;
 use container::Map;
 use option;
 use comm::{Chan, GenericChan, GenericPort, Port, stream};
-use pipes;
 use prelude::*;
 use unstable;
 use ptr;
 use hashmap::linear::LinearSet;
 use task::local_data_priv::{local_get, local_set};
 use task::rt::rust_task;
-use task::rt::rust_closure;
 use task::rt;
 use task::{Failure, ManualThreads, PlatformThread, SchedOpts, SingleThreaded};
 use task::{Success, TaskOpts, TaskResult, ThreadPerCore, ThreadPerTask};