From daa65c15dea5157a67876bd4b450971bd4832862 Mon Sep 17 00:00:00 2001
From: Tomoyuki Sahara <tsahara@iij.ad.jp>
Date: Wed, 12 Feb 2014 16:33:34 +0900
Subject: add dummy IO#flush for better compatibility with CRuby.

---
 mrblib/io.rb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mrblib/io.rb b/mrblib/io.rb
index ca687aee0..63a1bb714 100644
--- a/mrblib/io.rb
+++ b/mrblib/io.rb
@@ -41,6 +41,11 @@ class IO
     end
   end
 
+  def flush
+    # mruby-io always writes immediately (no output buffer).
+    self
+  end
+
   def write(string)
     str = string.is_a?(String) ? string : string.to_s
     return str.size unless str.size > 0
-- 
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