usa	2015-01-31 20:40:43 +0900 (Sat, 31 Jan 2015)

  New Revision: 49459

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=49459

  Log:
    * tool/downloader.rb (Downloader::RubyGems.download): Gem::Security::*#ui= is
      very new feature.

  Modified files:
    trunk/tool/downloader.rb
Index: tool/downloader.rb
===================================================================
--- tool/downloader.rb	(revision 49458)
+++ tool/downloader.rb	(revision 49459)
@@ -48,7 +48,7 @@ class Downloader https://github.com/ruby/ruby/blob/trunk/tool/downloader.rb#L48
       super("#{$rubygems_schema}://rubygems.org/downloads/#{name}", file, nil, ims, options) or
         return false
       policy = Gem::Security::LowSecurity
-      (policy = policy.dup).ui = Gem::SilentUI.new
+      (policy = policy.dup).ui = Gem::SilentUI.new if policy.respond_to?(:'ui=')
       pkg = Gem::Package.new(file)
       pkg.security_policy = policy
       begin

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