From 6de1c64a9cc374cf7c201183ad7e3145ecfccae2 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 16 Sep 2019 07:44:51 +0900
Subject: Add small fix over #4712

---
 mrbgems/mruby-io/mrblib/io.rb | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mrbgems/mruby-io/mrblib/io.rb b/mrbgems/mruby-io/mrblib/io.rb
index 6b83644ef..8297cb1b5 100644
--- a/mrbgems/mruby-io/mrblib/io.rb
+++ b/mrbgems/mruby-io/mrblib/io.rb
@@ -140,8 +140,8 @@ class IO
   def eof?
     _check_readable
     begin
-      buf = _read_buf
-      return buf.empty?
+      _read_buf
+      return @buf.empty?
     rescue EOFError
       return true
     end
@@ -177,7 +177,6 @@ class IO
     rescue EOFError => e
       raise e if @buf.empty?
     end
-    @buf
   end
 
   def ungetc(substr)
-- 
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