From 8951cb5c40e4f577511ce7a10eca59f779c88933 Mon Sep 17 00:00:00 2001
From: s3bk <48330868+s3bk@users.noreply.github.com>
Date: Sun, 16 Jun 2019 22:59:12 +0300
Subject: [PATCH] implement Error::source for Box<T: Error>

fixes https://github.com/rust-lang/rust/issues/61899
---
 src/libstd/error.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/libstd/error.rs b/src/libstd/error.rs
index 5cc7dcdae1fcd..5b1e78a113917 100644
--- a/src/libstd/error.rs
+++ b/src/libstd/error.rs
@@ -560,6 +560,10 @@ impl<T: Error> Error for Box<T> {
     fn cause(&self) -> Option<&dyn Error> {
         Error::cause(&**self)
     }
+
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        Error::source(&**self)
+    }
 }
 
 #[stable(feature = "fmt_error", since = "1.11.0")]