* lib/rdoc: Update to RDoc 4.1.0.preview.1

RDoc 4.1.0 contains a number of enhancements including a new default
  style and accessibility support.  You can see the changelog here:

  https://github.com/rdoc/rdoc/blob/v4.1.0.preview.1/History.rdoc

* test/rdoc:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42971 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/rdoc/test_rdoc_context.rb

@@ -41,6 +41,14 @@ class TestRDocContext < XrefTestCase
     assert_equal [as], @context.unmatched_alias_lists['#old_name']
   end
 
+  def test_add
+    @context.add RDoc::Extend,  'Ext', 'comment'
+    @context.add RDoc::Include, 'Incl', 'comment'
+
+    refute_empty @context.extends
+    refute_empty @context.includes
+  end
+
   def test_add_alias_method_attr
     top_level = @store.add_file 'file.rb'
 
@@ -691,6 +699,15 @@ class TestRDocContext < XrefTestCase
     assert_equal [@apub, @aprot, @apriv], @vis.attributes
   end
 
+  def test_remove_invisible_nodoc
+    util_visibilities
+
+    @vis.remove_invisible :nodoc
+
+    assert_equal [@pub, @prot, @priv], @vis.method_list
+    assert_equal [@apub, @aprot, @apriv], @vis.attributes
+  end
+
   def test_remove_invisible_protected
     util_visibilities