rollup merge of #23919: alexcrichton/stabilize-io-error

Conflicts:
	src/libstd/fs/tempdir.rs
	src/libstd/io/error.rs

src/libstd/net/udp.rs

@@ -76,7 +76,7 @@ impl UdpSocket {
         match try!(addr.to_socket_addrs()).next() {
             Some(addr) => self.0.send_to(buf, &addr),
             None => Err(Error::new(ErrorKind::InvalidInput,
-                                   "no addresses to send data to", None)),
+                                   "no addresses to send data to")),
         }
     }