From: cody@...
Date: 2017-06-13T16:40:30+00:00
Subject: [ruby-core:81666] [Ruby trunk Bug#13656] Method#super_method returns incorrect result dependent on unrelated module

Issue #13656 has been reported by ccutrer (Cody Cutrer).

----------------------------------------
Bug #13656: Method#super_method returns incorrect result dependent on unrelated module
https://bugs.ruby-lang.org/issues/13656

* Author: ccutrer (Cody Cutrer)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
~~~
module Calculations
  def pluck
     puts "calculations"
  end
end

module Calculations2
  def pluck
    puts "calculations2"
    super
  end
end

class Relation
  include Calculations
end

Relation.prepend(Calculations2)

class CollectionProxy < Relation
  def pluck
    puts "collection_proxy"
    super
  end
end

module CollectionProxy2
  def unrelated
  end
end

# this is the critical line
CollectionProxy.prepend(CollectionProxy2)

ConcreteProxy = Class.new(CollectionProxy)

# these are the expected results
ConcreteProxy.new.method(:pluck).owner == CollectionProxy
ConcreteProxy.new.method(:pluck).super_method.owner == Calculations2
ConcreteProxy.new.method(:pluck).super_method.super_method.owner == Calculations
~~~

The critical line is the CollectionProxy2 module. If I don't prepend it into CollectionProxy (or if I include it instead of prepend it), the expected results pass. But when it *is* prepended, the owner for all super_methods will always be CollectionProxy, as if it can't find any more ancestors (if you actually call `ConcreteProxy.new.pluck` it does call the three methods, in the correct order). So this is an introspection only problem.



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