From: shyouhei@...
Date: 2016-09-27T08:32:52+00:00
Subject: [ruby-core:77419] [Ruby trunk Bug#12787][Feedback] Stackoverflow over when alias_method and prepend are used in combination

Issue #12787 has been updated by Shyouhei Urabe.

Status changed from Open to Feedback

Which version of ruby are you using? because I can't reproduce the stack overflow using 2.3.1 on my machine.

```
% ruby -v ~/Downloads/stackoverflow_with_alias_and_prepend
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]
i am in prepend
i am in alias
 I am requester in Netter
%
```

----------------------------------------
Bug #12787: Stackoverflow over when alias_method and prepend are used in combination
https://bugs.ruby-lang.org/issues/12787#change-60676

* Author: ethiraj srinivasan
* Status: Feedback
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
With Ruby 2.0 Module#prepend was used to overcome the drawbacks of alias_method_chaining. Most of the gems/projects still use alias_method_chain since they support 1.9.3 and with upcoming gems/projects using prepend for the method that is already aliased throws stackoverflow error since the aliased method and prepend method call each other and results in deadlock.


~~~ ruby
class Netter
 def requester
  puts " I am requester in Netter"
 end
end
class Netter
  def requester_with_alias
    puts "i am in alias"
    requester_without_alias
  end
  alias_method :requester_without_alias, :requester
  alias_method :requester, :requester_with_alias
end
module Prepender
  def requester
    puts "i am in prepend"
    super
  end
end
Netter.prepend(Prepender)

Netter.new.requester
~~~


---Files--------------------------------
stackoverflow_with_alias_and_prepend (404 Bytes)


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