From ad03390fedc85714c056a711056419e942c05c2e Mon Sep 17 00:00:00 2001
From: Victor Ermolaev <victorermolaev@gmail.com>
Date: Fri, 10 Mar 2023 13:47:39 +0100
Subject: [PATCH] Print error chain for `ConnectionHandlerUpgrErr`

---
 swarm/src/handler.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/swarm/src/handler.rs b/swarm/src/handler.rs
index cf8b9c1f2cb9..f48021a57979 100644
--- a/swarm/src/handler.rs
+++ b/swarm/src/handler.rs
@@ -457,7 +457,7 @@ impl<TUpgrErr> ConnectionHandlerUpgrErr<TUpgrErr> {
 
 impl<TUpgrErr> fmt::Display for ConnectionHandlerUpgrErr<TUpgrErr>
 where
-    TUpgrErr: fmt::Display,
+    TUpgrErr: error::Error + 'static,
 {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
@@ -467,7 +467,7 @@ where
             ConnectionHandlerUpgrErr::Timer => {
                 write!(f, "Timer error while opening a substream")
             }
-            ConnectionHandlerUpgrErr::Upgrade(err) => write!(f, "{err}"),
+            err @ ConnectionHandlerUpgrErr::Upgrade(_) => crate::print_error_chain(f, err),
         }
     }
 }