https://git.ruby-lang.org/ruby.git/commit/?id=91135f6d29

From 91135f6d2900b1b8ae41998a921b6382ebba395c Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Wed, 6 Nov 2019 11:29:51 +0900
Subject: Promote singleton to default gems


diff --git a/doc/maintainers.rdoc b/doc/maintainers.rdoc
index dbb4fd2..cde67e9 100644
--- a/doc/maintainers.rdoc
+++ b/doc/maintainers.rdoc
@@ -105,8 +105,6 @@ Zachary Scott (zzak) https://github.com/ruby/ruby/blob/trunk/doc/maintainers.rdoc#L105
   Tanaka Akira (akr)
 [lib/shellwords.rb]
   Akinori MUSHA (knu)
-[lib/singleton.rb]
-  Yukihiro Matsumoto (matz)
 [lib/tempfile.rb]
   _unmaintained_
 [lib/tmpdir.rb]
@@ -220,6 +218,9 @@ Zachary Scott (zzak) https://github.com/ruby/ruby/blob/trunk/doc/maintainers.rdoc#L218
 [lib/rss.rb, lib/rss/*]
   Kouhei Sutou (kou)
   https://github.com/ruby/rss
+[lib/singleton.rb]
+  Yukihiro Matsumoto (matz)
+  https://github.com/ruby/singleton
 [lib/thwait.rb]
   Keiju ISHITSUKA (keiju)
   https://github.com/ruby/thwait
diff --git a/doc/standard_library.rdoc b/doc/standard_library.rdoc
index 975bc39..7517c3e 100644
--- a/doc/standard_library.rdoc
+++ b/doc/standard_library.rdoc
@@ -41,7 +41,6 @@ Gem:: Package management framework for Ruby https://github.com/ruby/ruby/blob/trunk/doc/standard_library.rdoc#L41
 SecureRandom:: Interface for secure random number generator
 Set:: Provides a class to deal with collections of unordered, unique values
 Shellwords:: Manipulates strings with word parsing rules of UNIX Bourne shell
-Singleton:: Implementation of the Singleton pattern for Ruby
 Tempfile:: A utility class for managing temporary files
 Time:: Extends the Time class with methods for parsing and conversion
 Timeout:: Auto-terminate potentially long-running operations in Ruby
@@ -87,6 +86,7 @@ Racc:: A LALR(1) parser generator written in Ruby. https://github.com/ruby/ruby/blob/trunk/doc/standard_library.rdoc#L86
 RDoc:: Produces HTML and command-line documentation for Ruby
 REXML:: An XML toolkit for Ruby
 RSS:: Family of libraries that support various formats of XML "feeds"
+Singleton:: Implementation of the Singleton pattern for Ruby
 Tracer:: Outputs a source level execution trace of a Ruby program
 WEBrick:: An HTTP server toolkit for Ruby
 
diff --git a/lib/singleton/singleton.gemspec b/lib/singleton/singleton.gemspec
new file mode 100644
index 0000000..f7ee6bb
--- /dev/null
+++ b/lib/singleton/singleton.gemspec
@@ -0,0 +1,27 @@ https://github.com/ruby/ruby/blob/trunk/lib/singleton/singleton.gemspec#L1
+begin
+  require_relative "lib/singleton/version"
+rescue LoadError # Fallback to load version file in ruby core repository
+  require_relative "version"
+end
+
+Gem::Specification.new do |spec|
+  spec.name          = "singleton"
+  spec.version       = Singleton::VERSION
+  spec.authors       = ["Yukihiro Matsumoto"]
+  spec.email         = ["matz@r..."]
+
+  spec.summary       = %q{The Singleton module implements the Singleton pattern.}
+  spec.description   = spec.summary
+  spec.homepage      = "https://github.com/ruby/singleton"
+  spec.license       = "BSD-2-Clause"
+
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = spec.homepage
+
+  spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
+    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  end
+  spec.bindir        = "exe"
+  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+end
diff --git a/lib/singleton/version.rb b/lib/singleton/version.rb
new file mode 100644
index 0000000..01ab1eb
--- /dev/null
+++ b/lib/singleton/version.rb
@@ -0,0 +1,3 @@ https://github.com/ruby/ruby/blob/trunk/lib/singleton/version.rb#L1
+module Singleton
+  VERSION = "0.1.0"
+end
diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index 0d9defe..eee06f0 100644
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -33,6 +33,7 @@ https://github.com/ruby/ruby/blob/trunk/tool/sync_default_gems.rb#L33
 # * https://github.com/ruby/e2mmap
 # * https://github.com/ruby/mutex_m
 # * https://github.com/ruby/racc
+# * https://github.com/ruby/singleton
 #
 
 require 'fileutils'
@@ -72,7 +73,8 @@ $repositories = { https://github.com/ruby/ruby/blob/trunk/tool/sync_default_gems.rb#L73
   forwardable: "ruby/forwardable",
   e2mmap: "ruby/e2mmap",
   mutex_m: "ruby/mutex_m",
-  racc: "ruby/racc"
+  racc: "ruby/racc",
+  singleton: "ruby/singleton"
 }
 
 def sync_default_gems(gem)
@@ -210,7 +212,7 @@ def sync_default_gems(gem) https://github.com/ruby/ruby/blob/trunk/tool/sync_default_gems.rb#L212
     rm_rf("test/racc/lib")
     rm_rf("lib/racc/cparse-jruby.jar")
     `git checkout ext/racc/cparse/README ext/racc/cparse/depend`
-  when "rexml", "rss", "matrix", "irb", "csv", "logger", "ostruct", "webrick", "fileutils", "forwardable", "prime", "tracer", "ipaddr", "mutex_m"
+  when "rexml", "rss", "matrix", "irb", "csv", "logger", "ostruct", "webrick", "fileutils", "forwardable", "prime", "tracer", "ipaddr", "mutex_m", "singleton"
     sync_lib gem
   else
   end
-- 
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