Implement Serialize for core::fmt::Arguments

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")]

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! {