[rubygems/rubygems] Drop support for 'gem env packageversion'

https://github.com/rubygems/rubygems/commit/be962ca0c4

lib/rubygems/commands/environment_command.rb

@@ -9,7 +9,6 @@ class Gem::Commands::EnvironmentCommand < Gem::Command
 
   def arguments # :nodoc:
     args = <<-EOF
-          packageversion  display the package version
           gemdir          display the path where gems are installed
           gempath         display path used to search for gems
           version         display the gem format version
@@ -76,8 +75,6 @@ lib/rubygems/defaults/operating_system.rb
     arg = options[:args][0]
     out <<
       case arg
-      when /^packageversion/ then
-        Gem::RubyGemsPackageVersion
       when /^version/ then
         Gem::VERSION
       when /^gemdir/, /^gemhome/, /^home/, /^GEM_HOME/ then

lib/rubygems/compatibility.rb

@@ -1,40 +0,0 @@
-# frozen_string_literal: true
-# :stopdoc:
-
-#--
-# This file contains all sorts of little compatibility hacks that we've
-# had to introduce over the years. Quarantining them into one file helps
-# us know when we can get rid of them.
-#
-# Ruby 1.9.x has introduced some things that are awkward, and we need to
-# support them, so we define some constants to use later.
-#++
-
-module Gem
-  RubyGemsVersion = VERSION
-
-  # TODO remove at RubyGems 3
-
-  RbConfigPriorities = %w[
-    MAJOR
-    MINOR
-    TEENY
-    EXEEXT RUBY_SO_NAME arch bindir datadir libdir ruby_install_name
-    ruby_version rubylibprefix sitedir sitelibdir vendordir vendorlibdir
-    rubylibdir
-  ].freeze
-
-  unless defined?(ConfigMap)
-    ##
-    # Configuration settings from ::RbConfig
-    ConfigMap = Hash.new do |cm, key| # TODO remove at RubyGems 3
-      cm[key] = RbConfig::CONFIG[key.to_s]
-    end
-  else
-    RbConfigPriorities.each do |key|
-      ConfigMap[key.to_sym] = RbConfig::CONFIG[key]
-    end
-  end
-
-  RubyGemsPackageVersion = VERSION
-end

test/rubygems/test_gem_commands_environment_command.rb

@@ -90,17 +90,6 @@ class TestGemCommandsEnvironmentCommand < Gem::TestCase
     assert_equal '', @ui.error
   end
 
-  def test_execute_packageversion
-    @cmd.send :handle_options, %w[packageversion]
-
-    use_ui @ui do
-      @cmd.execute
-    end
-
-    assert_equal "#{Gem::RubyGemsPackageVersion}\n", @ui.output
-    assert_equal '', @ui.error
-  end
-
   def test_execute_remotesources
     orig_sources = Gem.sources.dup
     Gem.sources.replace %w[http://gems.example.com]