Merge RubyGems and Bundler master

  Merge from https://github.com/rubygems/rubygems/commit/793ad95ecb40e84a1dcb4cb60f2686843ed90de5

4 files changed, 12 insertions, 21 deletions

diff --git a/lib/rubygems/commands/setup_command.rb b/lib/rubygems/commands/setup_command.rb
index ed1fcaa4b8..0601dccb07 100644
--- a/lib/rubygems/commands/setup_command.rb
+++ b/lib/rubygems/commands/setup_command.rb
@@ -12,8 +12,6 @@ class Gem::Commands::SetupCommand < Gem::Command
   ENV_PATHS = %w[/usr/bin/env /bin/env].freeze
 
   def initialize
-    require 'tmpdir'
-
     super 'setup', 'Install RubyGems',
           :format_executable => false, :document => %w[ri],
           :force => true,
@@ -253,6 +251,8 @@ By default, this RubyGems will install gem as:
       Dir.chdir path do
         bin_file = "gem"
 
+        require 'tmpdir'
+
         dest_file = target_bin_path(bin_dir, bin_file)
         bin_tmp_file = File.join Dir.tmpdir, "#{bin_file}.#{$$}"
 
diff --git a/lib/rubygems/requirement.rb b/lib/rubygems/requirement.rb
index d2e28fab5b..9edd6aa7d3 100644
--- a/lib/rubygems/requirement.rb
+++ b/lib/rubygems/requirement.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-require_relative "deprecate"
+require_relative "version"
 
 ##
 # A Requirement is a set of one or more version restrictions. It supports a
diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index 40a5bddff6..dc5e5ba013 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -9,6 +9,8 @@
 require_relative 'deprecate'
 require_relative 'basic_specification'
 require_relative 'stub_specification'
+require_relative 'platform'
+require_relative 'requirement'
 require_relative 'specification_policy'
 require_relative 'util/list'
 
@@ -179,18 +181,14 @@ class Gem::Specification < Gem::BasicSpecification
   end
 
   def self.clear_specs # :nodoc:
-    @@all_specs_mutex.synchronize do
-      @@all = nil
-      @@stubs = nil
-      @@stubs_by_name = {}
-      @@spec_with_requirable_file = {}
-      @@active_stub_with_requirable_file = {}
-    end
+    @@all = nil
+    @@stubs = nil
+    @@stubs_by_name = {}
+    @@spec_with_requirable_file = {}
+    @@active_stub_with_requirable_file = {}
   end
   private_class_method :clear_specs
 
-  @@all_specs_mutex = Thread::Mutex.new
-
   clear_specs
 
   # Sentinel object to represent "not found" stubs
@@ -758,7 +756,7 @@ class Gem::Specification < Gem::BasicSpecification
   attr_accessor :specification_version
 
   def self._all # :nodoc:
-    @@all_specs_mutex.synchronize { @@all ||= Gem.loaded_specs.values | stubs.map(&:to_spec) }
+    @@all ||= Gem.loaded_specs.values | stubs.map(&:to_spec)
   end
 
   def self.clear_load_cache # :nodoc:
@@ -1086,7 +1084,7 @@ class Gem::Specification < Gem::BasicSpecification
   # +prerelease+ is true.
 
   def self.latest_specs(prerelease = false)
-    _latest_specs Gem::Specification._all, prerelease
+    _latest_specs Gem::Specification.stubs, prerelease
   end
 
   ##
diff --git a/lib/rubygems/version.rb b/lib/rubygems/version.rb
index 37fd71edc0..42e0f23505 100644
--- a/lib/rubygems/version.rb
+++ b/lib/rubygems/version.rb
@@ -149,13 +149,6 @@
 # For the last example, single-digit versions are automatically extended with
 # a zero to give a sensible result.
 
-# Our code style opens classes directly without opening the intermediate
-# modules. This works because tha main entrypoint `rubygems.rb`, which defines
-# the root `Gem` module, is usually required first. But in this case we want to
-# allow using `Gem::Version` without loading the rest of rubygems, so we
-# explicit define the `Gem` placeholder module first.
-module Gem; end
-
 require_relative "deprecate"
 
 class Gem::Version