From c01df7e58f34eb81bf569614091a4db428c61282 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 15 Oct 2019 23:13:49 +0900
Subject: [PATCH] Fixed the key to delete [Bug #16250]

https://github.com/ruby/ruby/commit/f94202fcc228d0348ca050a7b18a8f8a538a7305#commitcomment-35505076

Co-Authored-By: Ary Borenszweig <asterite@gmail.com>
---
 lib/irb/color.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/irb/color.rb b/lib/irb/color.rb
index 0198838c6d..7a1d0c30ce 100644
--- a/lib/irb/color.rb
+++ b/lib/irb/color.rb
@@ -141,7 +141,7 @@ module IRB # :nodoc:
         seen[obj] = true
         block.call
       ensure
-        seen.delete(obj.object_id)
+        seen.delete(obj)
       end
 
       # Ripper::Lexer::Elem#state is supported on Ruby 2.5+