Upgrade to Rust 2018

This resolves a lot of NLL issues, however full NLL will be necessary to
handle a couple of remaining issues.

1 files changed, 2 insertions, 4 deletions

diff --git a/src/meter.rs b/src/meter.rs
index 1b6003db..32650e4d 100644
--- a/src/meter.rs
+++ b/src/meter.rs
@@ -75,9 +75,7 @@ impl<'a> Sampler<'a> {
 
 impl<'a> Drop for Sampler<'a> {
     fn drop(&mut self) {
-        // Work around borrowck
-        let duration = self.alive_duration();
-        self.meter.add_sample(duration);
+        self.meter.add_sample(self.alive_duration());
     }
 }
 
@@ -88,7 +86,7 @@ impl Meter {
     }
 
     /// Get a sampler
-    pub fn sampler(&mut self) -> Sampler {
+    pub fn sampler(&mut self) -> Sampler<'_> {
         Sampler::new(self)
     }