From 84e384196d66fddf49ed93387ccf8f04d95af11c Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Tue, 26 Jun 2018 23:29:44 -0700
Subject: [PATCH] Implement Serialize for core::fmt::Arguments

---
 serde/src/ser/impls.rs       | 9 +++++++++
 test_suite/tests/test_ser.rs | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/serde/src/ser/impls.rs b/serde/src/ser/impls.rs
index 0b21e541..cb273982 100644
--- a/serde/src/ser/impls.rs
+++ b/serde/src/ser/impls.rs
@@ -69,6 +69,15 @@ impl Serialize for String {
     }
 }
 
+impl<'a> Serialize for fmt::Arguments<'a> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.collect_str(self)
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 
 #[cfg(feature = "std")]
diff --git a/test_suite/tests/test_ser.rs b/test_suite/tests/test_ser.rs
index cd4ce6bf..eff19069 100644
--- a/test_suite/tests/test_ser.rs
+++ b/test_suite/tests/test_ser.rs
@@ -462,6 +462,11 @@ declare_tests! {
             Token::SeqEnd,
         ],
     }
+    test_fmt_arguments {
+        format_args!("{}{}", 1, 'a') => &[
+            Token::Str("1a"),
+        ],
+    }
 }
 
 declare_tests! {