std: unbox closures used in let bindings

src/libstd/io/net/udp.rs

@@ -344,7 +344,7 @@ mod test {
         let (tx2, rx2) = channel();
 
         spawn(move|| {
-            let send_as = |ip, val: &[u8]| {
+            let send_as = |&: ip, val: &[u8]| {
                 match UdpSocket::bind(ip) {
                     Ok(client) => {
                         let client = box client;

src/libstd/num/strconv.rs

@@ -321,10 +321,10 @@ pub fn float_to_str_bytes_common<T: Float>(
         // cut off the one extra digit, and depending on its value
         // round the remaining ones.
         if limit_digits && dig == digit_count {
-            let ascii2value = |chr: u8| {
+            let ascii2value = |&: chr: u8| {
                 (chr as char).to_digit(radix).unwrap()
             };
-            let value2ascii = |val: uint| {
+            let value2ascii = |&: val: uint| {
                 char::from_digit(val, radix).unwrap() as u8
             };
 

src/libstd/sys/unix/process.rs

@@ -195,7 +195,7 @@ impl Process {
                 // up /dev/null into that file descriptor. Otherwise, the first file
                 // descriptor opened up in the child would be numbered as one of the
                 // stdio file descriptors, which is likely to wreak havoc.
-                let setup = |src: Option<P>, dst: c_int| {
+                let setup = |&: src: Option<P>, dst: c_int| {
                     let src = match src {
                         None => {
                             let flags = if dst == libc::STDIN_FILENO {

src/libstd/sys/windows/process.rs

@@ -162,7 +162,7 @@ impl Process {
             // Similarly to unix, we don't actually leave holes for the stdio file
             // descriptors, but rather open up /dev/null equivalents. These
             // equivalents are drawn from libuv's windows process spawning.
-            let set_fd = |fd: &Option<P>, slot: &mut HANDLE,
+            let set_fd = |&: fd: &Option<P>, slot: &mut HANDLE,
                           is_stdin: bool| {
                 match *fd {
                     None => {