https://git.ruby-lang.org/ruby.git/commit/?id=9fdef28687

From 9fdef28687fba5e01d0ee6a2422dba9dd0f7d1b9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Rodr=C3=ADguez?= <deivid.rodriguez@r...>
Date: Tue, 24 May 2022 15:23:13 +0200
Subject: [rubygems/rubygems] Show exception cause in bug report template

https://github.com/rubygems/rubygems/commit/84b163e804
---
 lib/bundler/friendly_errors.rb | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/lib/bundler/friendly_errors.rb b/lib/bundler/friendly_errors.rb
index cc615db60c..ff6cdc4123 100644
--- a/lib/bundler/friendly_errors.rb
+++ b/lib/bundler/friendly_errors.rb
@@ -65,8 +65,7 @@ module Bundler https://github.com/ruby/ruby/blob/trunk/lib/bundler/friendly_errors.rb#L65
         --- ERROR REPORT TEMPLATE -------------------------------------------------------
 
         ```
-        #{e.class}: #{e.message}
-          #{e.backtrace && e.backtrace.join("\n          ").chomp}
+        #{exception_message(e)}
         ```
 
         #{Bundler::Env.report}
@@ -85,6 +84,21 @@ module Bundler https://github.com/ruby/ruby/blob/trunk/lib/bundler/friendly_errors.rb#L84
       EOS
     end
 
+    def exception_message(error)
+      message = serialized_exception_for(error)
+      cause = error.cause
+      return message unless cause
+
+      message + serialized_exception_for(cause)
+    end
+
+    def serialized_exception_for(e)
+      <<-EOS.gsub(/^ {8}/, "")
+        #{e.class}: #{e.message}
+          #{e.backtrace && e.backtrace.join("\n          ").chomp}
+      EOS
+    end
+
     def issues_url(exception)
       message = exception.message.lines.first.tr(":", " ").chomp
       message = message.split("-").first if exception.is_a?(Errno)
-- 
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