From ed2b92f98b2fadb9be0007a3e7ff14b6da98f8b1 Mon Sep 17 00:00:00 2001
From: Andrii Radyk <ander.ender@gmail.com>
Date: Mon, 20 Jan 2020 23:07:27 +0100
Subject: [PATCH] add Error::source

---
 src/ser/mod.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/ser/mod.rs b/src/ser/mod.rs
index 598b3a4d..51d92af9 100644
--- a/src/ser/mod.rs
+++ b/src/ser/mod.rs
@@ -86,6 +86,14 @@ impl error::Error for Error {
             Error::Utf8(ref err) => Some(err),
         }
     }
+
+    /// The lower-level source of this error, in the case of a `Utf8` error.
+    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+        match *self {
+            Error::Custom(_) => None,
+            Error::Utf8(ref err) => Some(err),
+        }
+    }
 }
 
 impl ser::Error for Error {