https://git.ruby-lang.org/ruby.git/commit/?id=5a83a1d554

From 5a83a1d55454d42cbf5b0bcc9df9c9c83e3a39d7 Mon Sep 17 00:00:00 2001
From: NAKAMURA Usaku <usa@r...>
Date: Tue, 30 Apr 2019 18:01:17 +0900
Subject: **Must** use IO::NULL for null device


diff --git a/tool/merger.rb b/tool/merger.rb
index 1ede6c8..755e55c 100755
--- a/tool/merger.rb
+++ b/tool/merger.rb
@@ -221,7 +221,7 @@ class << Merger https://github.com/ruby/ruby/blob/trunk/tool/merger.rb#L221
 
   def svn_mode?
     return @svn_mode if defined?(@svn_mode)
-    @svn_mode = system("svn info > /dev/null 2>&1")
+    @svn_mode = system("svn info > #{IO::NULL} 2>&1")
   end
 
   # Prints the version of Ruby found in version.h
-- 
cgit v0.10.2


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