From aebe1fddab8f43ab4708f6f37ca75f859d110832 Mon Sep 17 00:00:00 2001
From: Robert O'Callahan <robert@ocallahan.org>
Date: Fri, 10 Mar 2017 00:18:56 +1300
Subject: [PATCH] Add Serialize impl for std::ops::Range

---
 serde/src/ser/impls.rs       | 19 +++++++++++++++++++
 test_suite/tests/test_ser.rs | 13 +++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/serde/src/ser/impls.rs b/serde/src/ser/impls.rs
index 4c7a263f..409ec470 100644
--- a/serde/src/ser/impls.rs
+++ b/serde/src/ser/impls.rs
@@ -29,6 +29,8 @@ use std::rc::Rc;
 use alloc::rc::Rc;
 #[cfg(feature = "std")]
 use std::time::Duration;
+#[cfg(feature = "std")]
+use std;
 
 #[cfg(feature = "std")]
 use std::sync::Arc;
@@ -262,6 +264,23 @@ impl<T> Serialize for VecDeque<T>
     serialize_seq!();
 }
 
+///////////////////////////////////////////////////////////////////////////////
+
+#[cfg(feature = "std")]
+impl<Idx: Serialize> Serialize for std::ops::Range<Idx> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
+        use super::SerializeStruct;
+        let mut state = try!(serializer.serialize_struct("Range", 2));
+        try!(state.serialize_field("start", &self.start));
+        try!(state.serialize_field("end", &self.end));
+        state.end()
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 #[cfg(feature = "unstable")]
 impl<A> Serialize for ops::Range<A>
     where ops::Range<A>: ExactSizeIterator + iter::Iterator<Item = A> + Clone,
diff --git a/test_suite/tests/test_ser.rs b/test_suite/tests/test_ser.rs
index 940f463d..d58fdfe7 100644
--- a/test_suite/tests/test_ser.rs
+++ b/test_suite/tests/test_ser.rs
@@ -366,6 +366,19 @@ declare_tests! {
             Token::StructEnd,
         ],
     }
+    test_range {
+        1u32..2u32 => &[
+            Token::StructStart("Range", 2),
+                Token::StructSep,
+                Token::Str("start"),
+                Token::U32(1),
+
+                Token::StructSep,
+                Token::Str("end"),
+                Token::U32(2),
+            Token::StructEnd,
+        ],
+    }
     test_net_ipv4addr {
         "1.2.3.4".parse::<net::Ipv4Addr>().unwrap() => &[Token::Str("1.2.3.4")],
     }