Revert "[rubygems/rubygems] [Require] Ensure -I beats a default gem"

This reverts commit 00cd5d74ce.

lib/rubygems/core_ext/kernel_require.rb

@@ -36,26 +36,6 @@ module Kernel
 
     path = path.to_path if path.respond_to? :to_path
 
-    resolved_path = begin
-      rp = nil
-      $LOAD_PATH[0...Gem.load_path_insert_index || -1].each do |lp|
-        Gem.suffixes.each do |s|
-          full_path = File.expand_path(File.join(lp, "#{path}#{s}").untaint)
-          if File.file?(full_path)
-            rp = full_path
-            break
-          end
-        end
-        break if rp
-      end
-      rp
-    end
-
-    if resolved_path
-      RUBYGEMS_ACTIVATION_MONITOR.exit
-      return gem_original_require(resolved_path)
-    end
-
     if spec = Gem.find_unresolved_default_spec(path)
       begin
         Kernel.send(:gem, spec.name, "#{Gem::Requirement.default}.a")

lib/rubygems/test_case.rb

@@ -739,7 +739,6 @@ class Gem::TestCase < (defined?(Minitest::Test) ? Minitest::Test : MiniTest::Uni
     spec.files = files
 
     lib_dir = File.join(@tempdir, "default_gems", "lib")
-    lib_dir.instance_variable_set(:@gem_prelude_index, lib_dir)
     $LOAD_PATH.unshift(lib_dir)
     files.each do |file|
       rb_path = File.join(lib_dir, file)

test/rubygems/test_require.rb

@@ -87,39 +87,6 @@ class TestGemRequire < Gem::TestCase
     end
   end
 
-  # Providing -I on the commandline should always beat gems
-  def test_dash_i_beats_default_gems
-    a1 = new_default_spec "a", "1", {"b" => "= 1"}, "test_gem_require_a.rb"
-    b1 = new_default_spec "b", "1", {"c" => "> 0"}, "b/c.rb"
-    c1 = new_default_spec "c", "1", nil, "c/c.rb"
-    c2 = new_default_spec "c", "2", nil, "c/c.rb"
-
-    install_default_specs c1, c2, b1, a1
-
-    dir = Dir.mktmpdir("test_require", @tempdir)
-    dash_i_arg = File.join dir, 'lib'
-
-    c_rb = File.join dash_i_arg, 'c', 'c.rb'
-
-    FileUtils.mkdir_p File.dirname c_rb
-    File.open(c_rb, 'w') { |f| f.write "class Object; HELLO = 'world' end" }
-
-    assert_require 'test_gem_require_a'
-
-    lp = $LOAD_PATH.dup
-
-    # Pretend to provide a commandline argument that overrides a file in gem b
-    $LOAD_PATH.unshift dash_i_arg
-
-    assert_require 'b/c'
-    assert_require 'c/c' # this should be required from -I
-    assert_equal "world", ::Object::HELLO
-    assert_equal %w(a-1 b-1), loaded_spec_names
-  ensure
-    $LOAD_PATH.replace lp
-    Object.send :remove_const, :HELLO if Object.const_defined? :HELLO
-  end
-
   def test_concurrent_require
     Object.const_set :FILE_ENTERED_LATCH, Latch.new(2)
     Object.const_set :FILE_EXIT_LATCH, Latch.new(1)