io -- introduce local to avoid conflicting borrow

src/libstd/io/net/udp.rs

@@ -83,7 +83,8 @@ impl Reader for UdpStream {
 
 impl Writer for UdpStream {
     fn write(&mut self, buf: &[u8]) -> IoResult<()> {
-        self.as_socket(|sock| sock.sendto(buf, self.connectedTo))
+        let connectedTo = self.connectedTo;
+        self.as_socket(|sock| sock.sendto(buf, connectedTo))
     }
 }