Promote drb to the default gems

doc/maintainers.rdoc

@@ -38,8 +38,6 @@ Zachary Scott (zzak)
 
 === Libraries
 
-[lib/drb.rb, lib/drb/*]
-  Masatoshi SEKI (seki)
 [lib/debug.rb]
   _unmaintained_
 [lib/mkmf.rb]
@@ -116,6 +114,9 @@ Zachary Scott (zzak)
 [lib/did_you_mean.rb]
   Yuki Nishijima (yuki24)
   https://github.com/ruby/did_you_mean
+[lib/drb.rb, lib/drb/*]
+  Masatoshi SEKI (seki)
+  https://github.com/ruby/drb
 [lib/erb.rb]
   Masatoshi SEKI (seki), Takashi Kokubun (k0kubun)
   https://github.com/ruby/erb

doc/standard_library.rdoc

@@ -9,7 +9,6 @@ description.
 == Libraries
 
 DEBUGGER__:: Debugging functionality for Ruby
-DRb:: Distributed object system for Ruby
 MakeMakefile:: Module used to generate a Makefile for C extensions
 RbConfig:: Information of your configure and build of Ruby
 Gem:: Package management framework for Ruby
@@ -39,6 +38,7 @@ CGI:: Support for the Common Gateway Interface protocol
 CSV:: Provides an interface to read and write CSV files and data
 Delegator:: Provides three abilities to delegate method calls to an object
 DidYouMean:: "Did you mean?" experience in Ruby
+DRb:: Distributed object system for Ruby
 English.rb:: Require 'English.rb' to reference global variables with less cryptic names
 ERB:: An easy to use but powerful templating system for Ruby
 FileUtils:: Several file utility methods for copying, moving, removing, etc

lib/drb/drb.gemspec

@@ -0,0 +1,30 @@
+begin
+  require_relative "lib/drb/version"
+rescue LoadError # Fallback to load version file in ruby core repository
+  require_relative "version"
+end
+
+Gem::Specification.new do |spec|
+  spec.name          = "drb"
+  spec.version       = DRb::VERSION
+  spec.authors       = ["Masatoshi SEKI"]
+  spec.email         = ["seki@ruby-lang.org"]
+
+  spec.summary       = %q{Distributed object system for Ruby}
+  spec.description   = %q{Distributed object system for Ruby}
+  spec.homepage      = "https://github.com/ruby/drb"
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
+  spec.licenses      = ["Ruby", "BSD-2-Clause"]
+
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = spec.homepage
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  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

lib/drb/version.rb

@@ -0,0 +1,3 @@
+module DRb
+  VERSION = "2.0.4"
+end

tool/sync_default_gems.rb

@@ -79,6 +79,7 @@ REPOSITORIES = {
   time: "ruby/time",
   pp: "ruby/pp",
   prettyprint: "ruby/prettyprint",
+  drb: "ruby/drb",
 }
 
 def sync_default_gems(gem)