edition: Eliminate ref keyword

As described in:
https://doc.rust-lang.org/edition-guide/rust-2018/ownership-and-lifetimes/default-match-bindings.html
which also covers the new mental model that the Rust Book will use for
teaching binding modes and has been found to be more friendly for both
beginners and experienced users.

Before:

    match *opt {
        Some(ref v) => ...,
        None => ...,
    }

After:

    match opt {
        Some(v) => ...,
        None => ...,
    }

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

Change-Id: I3c5800a9be36aaf5d3290ae3bd3116f699cb00b7
Reviewed-on: https://chromium-review.googlesource.com/1566669
Commit-Ready: David Tolnay <dtolnay@chromium.org>
Tested-by: David Tolnay <dtolnay@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/sys_util/src/clock.rs b/sys_util/src/clock.rs
index 09bcd0a..878014d 100644
--- a/sys_util/src/clock.rs
+++ b/sys_util/src/clock.rs
@@ -72,15 +72,15 @@ impl FakeClock {
     /// Drop any existing events registered to the same raw fd.
     pub fn add_event_fd(&mut self, deadline_ns: u64, fd: EventFd) {
         self.deadlines
-            .retain(|&(_, ref old_fd)| fd.as_raw_fd() != old_fd.as_raw_fd());
+            .retain(|(_, old_fd)| fd.as_raw_fd() != old_fd.as_raw_fd());
         self.deadlines.push((deadline_ns, fd));
     }
 
     pub fn add_ns(&mut self, ns: u64) {
         self.ns_since_epoch += ns;
         let time = self.ns_since_epoch;
-        self.deadlines.retain(|&(ns, ref fd)| {
-            let expired = ns <= time;
+        self.deadlines.retain(|(ns, fd)| {
+            let expired = *ns <= time;
             if expired {
                 fd.write(1).unwrap();
             }