std: unbox closures used in function arguments

src/libstd/sys/common/thread_info.rs

@@ -26,13 +26,13 @@ struct ThreadInfo {
 thread_local! { static THREAD_INFO: RefCell<Option<ThreadInfo>> = RefCell::new(None) }
 
 impl ThreadInfo {
-    fn with<R>(f: |&mut ThreadInfo| -> R) -> R {
+    fn with<R, F>(f: F) -> R where F: FnOnce(&mut ThreadInfo) -> R {
         if THREAD_INFO.destroyed() {
             panic!("Use of std::thread::Thread::current() is not possible after \
                     the thread's local data has been destroyed");
         }
 
-        THREAD_INFO.with(|c| {
+        THREAD_INFO.with(move |c| {
             if c.borrow().is_none() {
                 *c.borrow_mut() = Some(ThreadInfo {
                     stack_bounds: (0, 0),

src/libstd/sys/windows/os.rs

@@ -124,7 +124,9 @@ pub unsafe fn pipe() -> IoResult<(FileDesc, FileDesc)> {
     }
 }
 
-pub fn fill_utf16_buf_and_decode(f: |*mut u16, DWORD| -> DWORD) -> Option<String> {
+pub fn fill_utf16_buf_and_decode<F>(mut f: F) -> Option<String> where
+    F: FnMut(*mut u16, DWORD) -> DWORD,
+{
     unsafe {
         let mut n = TMPBUF_SZ as DWORD;
         let mut res = None;