Change PrismRuby not to depend on hack that stores module nesting information to context.parent

lib/rdoc/code_object/context.rb

@@ -785,7 +785,8 @@ def find_constant_named(name)
   end
 
   ##
-  # Find a module at a higher scope
+  # Tries to find a module at a higher scope.
+  # But parent is not always a higher module nesting scope, so the result is not correct.
 
   def find_enclosing_module_named(name)
     parent && parent.find_module_named(name)
@@ -860,7 +861,8 @@ def find_method_named(name)
   end
 
   ##
-  # Find a module with +name+ using ruby's scoping rules
+  # Find a module with +name+ trying to using ruby's scoping rules.
+  # find_enclosing_module_named cannot use ruby's scoping so the result is not correct.
 
   def find_module_named(name)
     res = @modules[name] || @classes[name]
@@ -869,6 +871,13 @@ def find_module_named(name)
     find_enclosing_module_named name
   end
 
+  # Get a module named +name+ in this context
+  # Don't look up for higher module nesting scopes. RDoc::Context doesn't have that information.
+
+  def get_module_named(name)
+    @modules[name] || @classes[name]
+  end
+
   ##
   # Look up +symbol+, first as a module, then as a local symbol.
 

lib/rdoc/code_object/mixin.rb

@@ -71,6 +71,9 @@ def inspect # :nodoc:
   # lookup behavior.
   #
   # As of the beginning of October, 2011, no gem includes nonexistent modules.
+  #
+  # When mixin is created from RDoc::Parser::PrismRuby, module name is already a resolved full-path name.
+  #
 
   def module
     return @module if @module

lib/rdoc/code_object/top_level.rb

@@ -149,6 +149,8 @@ def find_module_named(name)
     find_class_or_module(name)
   end
 
+  alias get_module_named find_module_named
+
   ##
   # Returns the relative name of this file
 

lib/rdoc/parser/prism_ruby.rb

@@ -59,11 +59,6 @@ def with_container(container, singleton: false)
     @container = container
     @singleton = singleton
     @in_proc_block = false
-    unless singleton
-      # Need to update module parent chain to emulate Module.nesting.
-      # This mechanism is inaccurate and needs to be fixed.
-      container.parent = old_container
-    end
     @module_nesting.push([container, singleton])
     yield container
   ensure
@@ -482,12 +477,15 @@ def add_attributes(names, rw, line_no)
     end
   end
 
+  # Adds includes/extends. Module name is resolved to full before adding.
+
   def add_includes_extends(names, rdoc_class, line_no) # :nodoc:
     return if @in_proc_block
     comment, directives = consecutive_comment(line_no)
     handle_code_object_directives(@container, directives) if directives
     names.each do |name|
-      ie = @container.add(rdoc_class, name, '')
+      resolved_name = resolve_constant_path(name)
+      ie = @container.add(rdoc_class, resolved_name || name, '')
       ie.store = @store
       ie.line = line_no
       ie.comment = comment
@@ -590,7 +588,7 @@ def find_or_create_module_path(module_name, create_mode)
     else
       @module_nesting.reverse_each do |nesting, singleton|
         next if singleton
-        mod = nesting.find_module_named(root_name)
+        mod = nesting.get_module_named(root_name)
         break if mod
         # If a constant is found and it is not a module or class, RDoc can't document about it.
         # Return an anonymous module to avoid wrong document creation.
@@ -601,9 +599,9 @@ def find_or_create_module_path(module_name, create_mode)
       mod ||= add_module.call(last_nesting, root_name, :module)
     end
     path.each do |name|
-      mod = mod.find_module_named(name) || add_module.call(mod, name, :module)
+      mod = mod.get_module_named(name) || add_module.call(mod, name, :module)
     end
-    mod.find_module_named(name) || add_module.call(mod, name, create_mode)
+    mod.get_module_named(name) || add_module.call(mod, name, create_mode)
   end
 
   # Resolves constant path to a full path by searching module nesting
@@ -614,10 +612,10 @@ def resolve_constant_path(constant_path)
     mod = nil
     @module_nesting.reverse_each do |nesting, singleton|
       next if singleton
-      mod = nesting.find_module_named(owner_name)
+      mod = nesting.get_module_named(owner_name)
       break if mod
     end
-    mod ||= @top_level.find_module_named(owner_name)
+    mod ||= @top_level.get_module_named(owner_name)
     [mod.full_name, path].compact.join('::') if mod
   end
 
@@ -657,7 +655,8 @@ def add_constant(constant_name, rhs_name, start_line, end_line)
       if rhs_name =~ /^::/
         @store.find_class_or_module(rhs_name)
       else
-        @container.find_module_named(rhs_name)
+        full_name = resolve_constant_path(rhs_name)
+        @store.find_class_or_module(full_name)
       end
     if mod && constant.document_self
       a = @container.add_module_alias(mod, rhs_name, constant, @top_level)

test/rdoc/parser/prism_ruby_test.rb

@@ -1746,6 +1746,7 @@ class << self
   end
 
   def test_include_with_module_nesting
+    omit 'not implemented' if accept_legacy_bug?
     util_parser <<~RUBY
       module A
         module M; end
@@ -1765,15 +1766,16 @@ class C::D::Foo
           include M
         end
       end
-      # TODO: make test pass with the following code appended
-      # module A::B::C
-      #   class D::Foo
-      #     include M
-      #   end
-      # end
+
+      module A::B::C
+        class D::Foo
+          include M
+        end
+      end
     RUBY
     klass = @store.find_class_named 'A::B::C::D::Foo'
-    assert_equal 'A::B::M', klass.includes.first.module.full_name
+    assert_equal 'A::B::M', klass.includes[0].module.full_name
+    assert_equal 'A::B::C::M', klass.includes[1].module.full_name
   end
 
   def test_various_argument_include