From 205c980cf0c75c6b8267491ade1e45cb2e91a61d Mon Sep 17 00:00:00 2001
From: Edward Barnard
Date: Sat, 6 Oct 2018 20:21:53 +0100
Subject: Manually implement Hash for Date to keep minimum supported Rust
 version at 1.18.0.

---
 src/date.rs | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/date.rs b/src/date.rs
index 5394ada..89b3118 100644
--- a/src/date.rs
+++ b/src/date.rs
@@ -1,10 +1,11 @@
 use humantime;
 use std::fmt;
+use std::hash::{Hash, Hasher};
 use std::result::Result as StdResult;
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
 
 /// A UTC timestamp. Used for serialization to and from the plist date type.
-#[derive(Clone, Copy, Hash, PartialEq)]
+#[derive(Clone, Copy, PartialEq)]
 pub struct Date {
     inner: SystemTime,
 }
@@ -54,6 +55,23 @@ impl fmt::Debug for Date {
     }
 }
 
+// TODO: Remove manual impl once minimum Rust version reaches 1.24.0.
+impl Hash for Date {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        let elapsed = match self.inner.duration_since(UNIX_EPOCH) {
+            Ok(elapsed) => {
+                false.hash(state);
+                elapsed
+            }
+            Err(err) => {
+                true.hash(state);
+                err.duration()
+            }
+        };
+        elapsed.hash(state)
+    }
+}
+
 impl From<SystemTime> for Date {
     fn from(date: SystemTime) -> Self {
         Date { inner: date }
-- 
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