[rubygems/rubygems] Let RDoc parse the doc of Kernel#require

Since RDoc does not parse string literals as documents, `eval` the
entire file instead of embedding in a here-document.
On the contrary, as `gem_original_require` alias is an implementation
detail but not for users, it should not be documented.

rubygems/rubygems@cad4cf16cf

lib/rubygems.rb

@@ -119,10 +119,6 @@ module Gem
   # to avoid deprecation warnings in Ruby 2.7.
   UNTAINT = RUBY_VERSION < "2.7" ? :untaint.to_sym : proc {}
 
-  # When https://bugs.ruby-lang.org/issues/17259 is available, there is no need to override Kernel#warn
-  KERNEL_WARN_IGNORES_INTERNAL_ENTRIES = RUBY_ENGINE == "truffleruby" ||
-                                         (RUBY_ENGINE == "ruby" && RUBY_VERSION >= "3.0")
-
   ##
   # An Array of Regexps that match windows Ruby platforms.
 
@@ -1348,7 +1344,16 @@ def default_gem_load_paths
 Gem::Specification.load_defaults
 
 require_relative "rubygems/core_ext/kernel_gem"
-require_relative "rubygems/core_ext/kernel_require"
-require_relative "rubygems/core_ext/kernel_warn"
+
+path = File.join(__dir__, "rubygems/core_ext/kernel_require.rb")
+# When https://bugs.ruby-lang.org/issues/17259 is available, there is no need to override Kernel#warn
+if RUBY_ENGINE == "truffleruby" ||
+   (RUBY_ENGINE == "ruby" && RUBY_VERSION >= "3.0")
+  file = "<internal:#{path}>"
+else
+  require_relative "rubygems/core_ext/kernel_warn"
+  file = path
+end
+eval File.read(path), nil, file
 
 require ENV["BUNDLER_SETUP"] if ENV["BUNDLER_SETUP"] && !defined?(Bundler)

lib/rubygems/core_ext/kernel_require.rb

@@ -13,12 +13,12 @@ module Kernel
 
   # Make sure we have a reference to Ruby's original Kernel#require
   unless defined?(gem_original_require)
+    # :stopdoc:
     alias gem_original_require require
     private :gem_original_require
+    # :startdoc:
   end
 
-  file = Gem::KERNEL_WARN_IGNORES_INTERNAL_ENTRIES ? "<internal:#{__FILE__}>" : __FILE__
-  module_eval <<'RUBY', file, __LINE__ + 1 # rubocop:disable Style/EvalWithLocation
   ##
   # When RubyGems is required, Kernel#require is replaced with our own which
   # is capable of loading gems on demand.
@@ -33,7 +33,7 @@ module Kernel
   # The normal <tt>require</tt> functionality of returning false if
   # that file has already been loaded is preserved.
 
-  def require(path)
+  def require(path) # :doc:
     if RUBYGEMS_ACTIVATION_MONITOR.respond_to?(:mon_owned?)
       monitor_owned = RUBYGEMS_ACTIVATION_MONITOR.mon_owned?
     end
@@ -168,7 +168,6 @@ def require(path)
       end
     end
   end
-RUBY
 
   private :require
 

lib/rubygems/core_ext/kernel_warn.rb

@@ -1,53 +1,50 @@
 # frozen_string_literal: true
 
-if !Gem::KERNEL_WARN_IGNORES_INTERNAL_ENTRIES
+module Kernel
+  rubygems_path = "#{__dir__}/" # Frames to be skipped start with this path.
 
-  module Kernel
-    rubygems_path = "#{__dir__}/" # Frames to be skipped start with this path.
+  original_warn = instance_method(:warn)
 
-    original_warn = instance_method(:warn)
+  remove_method :warn
 
+  class << self
     remove_method :warn
+  end
 
-    class << self
-      remove_method :warn
+  module_function define_method(:warn) {|*messages, **kw|
+    unless uplevel = kw[:uplevel]
+      if Gem.java_platform? && RUBY_VERSION < "3.1"
+        return original_warn.bind(self).call(*messages)
+      else
+        return original_warn.bind(self).call(*messages, **kw)
+      end
     end
 
-    module_function define_method(:warn) {|*messages, **kw|
-      unless uplevel = kw[:uplevel]
-        if Gem.java_platform? && RUBY_VERSION < "3.1"
-          return original_warn.bind(self).call(*messages)
-        else
-          return original_warn.bind(self).call(*messages, **kw)
+    # Ensure `uplevel` fits a `long`
+    uplevel, = [uplevel].pack("l!").unpack("l!")
+
+    if uplevel >= 0
+      start = 0
+      while uplevel >= 0
+        loc, = caller_locations(start, 1)
+        unless loc
+          # No more backtrace
+          start += uplevel
+          break
         end
-      end
 
-      # Ensure `uplevel` fits a `long`
-      uplevel, = [uplevel].pack("l!").unpack("l!")
-
-      if uplevel >= 0
-        start = 0
-        while uplevel >= 0
-          loc, = caller_locations(start, 1)
-          unless loc
-            # No more backtrace
-            start += uplevel
-            break
-          end
+        start += 1
 
-          start += 1
-
-          if path = loc.path
-            unless path.start_with?(rubygems_path) || path.start_with?("<internal:")
-              # Non-rubygems frames
-              uplevel -= 1
-            end
+        if path = loc.path
+          unless path.start_with?(rubygems_path) || path.start_with?("<internal:")
+            # Non-rubygems frames
+            uplevel -= 1
           end
         end
-        kw[:uplevel] = start
       end
+      kw[:uplevel] = start
+    end
 
-      original_warn.bind(self).call(*messages, **kw)
-    }
-  end
+    original_warn.bind(self).call(*messages, **kw)
+  }
 end