From 21a43489b18d2ceb04182e0d36bb906439a86610 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@gmail.com>
Date: Fri, 31 May 2019 22:53:01 +0900
Subject: [PATCH] Use IO#sync= instead of a monkey patch

---
 lib/reline.rb | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/lib/reline.rb b/lib/reline.rb
index 5f3c0e416e..55e5c5ee61 100644
--- a/lib/reline.rb
+++ b/lib/reline.rb
@@ -304,13 +304,7 @@ module Reline
   def inner_readline(prompt, add_hist, multiline, &confirm_multiline_termination)
     if ENV['RELINE_STDERR_TTY']
       $stderr.reopen(ENV['RELINE_STDERR_TTY'], 'w')
-      class << $stderr
-        alias :old_puts :puts
-        def puts(*v)
-          old_puts(*v)
-          flush
-        end
-      end
+      $stderr.sync = true
     end
     @@config.read
     otio = Reline::IOGate.prep