silence various warnings in stdlib, no idea why they suddenly started

src/liballoc/heap.rs

@@ -255,7 +255,6 @@ mod imp {
 #[cfg(not(jemalloc), unix)]
 mod imp {
     use core::cmp;
-    use core::mem;
     use core::ptr;
     use libc;
     use libc_heap;

src/libsync/comm/mod.rs

@@ -379,7 +379,7 @@ pub struct Receiver<T> {
     inner: UnsafeCell<Flavor<T>>,
     receives: Cell<uint>,
     // can't share in an arc
-    marker: marker::NoSync,
+    _marker: marker::NoSync,
 }
 
 /// An iterator over messages on a receiver, this iterator will block
@@ -397,7 +397,7 @@ pub struct Sender<T> {
     inner: UnsafeCell<Flavor<T>>,
     sends: Cell<uint>,
     // can't share in an arc
-    marker: marker::NoSync,
+    _marker: marker::NoSync,
 }
 
 /// The sending-half of Rust's synchronous channel type. This half can only be
@@ -406,7 +406,7 @@ pub struct Sender<T> {
 pub struct SyncSender<T> {
     inner: Arc<UnsafeCell<sync::Packet<T>>>,
     // can't share in an arc
-    marker: marker::NoSync,
+    _marker: marker::NoSync,
 }
 
 /// This enumeration is the list of the possible reasons that try_recv could not
@@ -543,7 +543,7 @@ impl<T: Send> Sender<T> {
         Sender {
             inner: UnsafeCell::new(inner),
             sends: Cell::new(0),
-            marker: marker::NoSync,
+            _marker: marker::NoSync,
         }
     }
 
@@ -719,7 +719,7 @@ impl<T: Send> Drop for Sender<T> {
 
 impl<T: Send> SyncSender<T> {
     fn new(inner: Arc<UnsafeCell<sync::Packet<T>>>) -> SyncSender<T> {
-        SyncSender { inner: inner, marker: marker::NoSync }
+        SyncSender { inner: inner, _marker: marker::NoSync }
     }
 
     /// Sends a value on this synchronous channel.
@@ -807,7 +807,7 @@ impl<T: Send> Drop for SyncSender<T> {
 
 impl<T: Send> Receiver<T> {
     fn new(inner: Flavor<T>) -> Receiver<T> {
-        Receiver { inner: UnsafeCell::new(inner), receives: Cell::new(0), marker: marker::NoSync }
+        Receiver { inner: UnsafeCell::new(inner), receives: Cell::new(0), _marker: marker::NoSync }
     }
 
     /// Blocks waiting for a value on this receiver

src/libsync/deque.rs

@@ -87,15 +87,15 @@ struct Deque<T> {
 /// There may only be one worker per deque.
 pub struct Worker<T> {
     deque: Arc<Deque<T>>,
-    noshare: marker::NoSync,
+    _noshare: marker::NoSync,
 }
 
 /// The stealing half of the work-stealing deque. Stealers have access to the
 /// opposite end of the deque from the worker, and they only have access to the
 /// `steal` method.
 pub struct Stealer<T> {
     deque: Arc<Deque<T>>,
-    noshare: marker::NoSync,
+    _noshare: marker::NoSync,
 }
 
 /// When stealing some data, this is an enumeration of the possible outcomes.
@@ -153,8 +153,8 @@ impl<T: Send> BufferPool<T> {
     pub fn deque(&self) -> (Worker<T>, Stealer<T>) {
         let a = Arc::new(Deque::new(self.clone()));
         let b = a.clone();
-        (Worker { deque: a, noshare: marker::NoSync },
-         Stealer { deque: b, noshare: marker::NoSync })
+        (Worker { deque: a, _noshare: marker::NoSync },
+         Stealer { deque: b, _noshare: marker::NoSync })
     }
 
     fn alloc(&mut self, bits: uint) -> Box<Buffer<T>> {
@@ -217,7 +217,7 @@ impl<T: Send> Stealer<T> {
 
 impl<T: Send> Clone for Stealer<T> {
     fn clone(&self) -> Stealer<T> {
-        Stealer { deque: self.deque.clone(), noshare: marker::NoSync }
+        Stealer { deque: self.deque.clone(), _noshare: marker::NoSync }
     }
 }