edition: Fill in macro imports

Macros were previously imported through `#[macro_use] extern crate`,
which is basically a glob import of all macros from the crate. As of
2018 edition of Rust, `extern crate` is no longer required and macros
are imported individually like any other item from a dependency. This CL
fills in all the appropriate macro imports that will allow us to remove
our use of `extern crate` in a subsequent CL.

TEST=cargo check --all-features --tests
TEST=kokoro

Change-Id: If2ec08b06b743abf5f62677c6a9927c3d5d90a54
Reviewed-on: https://chromium-review.googlesource.com/1565546
Commit-Ready: David Tolnay <dtolnay@chromium.org>
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: David Tolnay <dtolnay@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: David Tolnay <dtolnay@chromium.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/devices/src/virtio/vhost/vsock.rs b/devices/src/virtio/vhost/vsock.rs
index 008d920..7f4c457 100644
--- a/devices/src/virtio/vhost/vsock.rs
+++ b/devices/src/virtio/vhost/vsock.rs
@@ -10,7 +10,7 @@ use std::thread;
 use byteorder::{ByteOrder, LittleEndian};
 
 use ::vhost::Vsock as VhostVsockHandle;
-use sys_util::{EventFd, GuestMemory};
+use sys_util::{error, warn, EventFd, GuestMemory};
 use virtio_sys::vhost;
 
 use super::worker::Worker;