Issue #16242 has been updated by jeremyevans0 (Jeremy Evans).


This issue is specific to modules that are refined and use prepend. The reason it does not work:

1. Refining a module or class that prepends other modules places the refinements in the class itself and not the origin iclass.

2. Inclusion of a module that prepends other modules skips the module itself, including only iclasses for the prepended modules and the origin iclass.

Those two behaviors combined meant that the method table for the refined methods for the included module never ends up in the method lookup chain for the class including the module.

Fix this by not skipping the module itself when the module is included (see https://github.com/ruby/ruby/pull/2550). This requires some code rearranging in rb_include_class_new to make sure the correct method tables and origin settings are used for the created iclass.

As origin iclasses shouldn't be exposed to Ruby, this also requires skipping modules that have origin iclasses in Module#ancestors (classes that have origin iclasses were already skipped).



----------------------------------------
Bug #16242: Refinements method call to failed
https://bugs.ruby-lang.org/issues/16242#change-81992

* Author: osyo (manga osyo)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.7.0
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Refinements method call to failed with `prepend`.


## No problem

```ruby
module M
  # Methods that you want to call only within this context
  refine M do
    def refine_method
      "refine_method"
    end
  end
  using M

  def hoge
    # OK: `refine_method` calls the method
    refine_method
  end
end

class X
  include M
end

pp X.new.hoge
# => "refine_method"
```


## No problem

* If `prepend` another module, the search for `refine_method` fails

```ruby
module OtherM
end

module M
  # Added prepend
  prepend OtherM

  refine M do
    def refine_method
      "refine_method"
    end
  end
  using M

  def hoge
    # Error: `hoge': undefined local variable or method `refine_method' for #<X:0x00007fa05a024390> (NameError)
    refine_method
  end
end

class X
  include M
end

# Error
pp X.new.hoge
```


## Environment

Reproduced in the following environment.

```ruby
RUBY_VERSION  # => "2.7.0"
RUBY_REVISION # => "02dfa0f16361c498e0f529054b00e3e09730892b"
RUBY_PLATFORM # => "x86_64-darwin17"
```

You can also confirm that it is reproduced here.
https://wandbox.org/permlink/I6tQesDRntT7JZqB




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