From: shugo@...
Date: 2015-12-17T22:47:23+00:00
Subject: [ruby-core:72225] [Ruby trunk - Bug #11826] After prepending a module, rewrite Hash#[] takes no effect for calls like Hash.new[:a]

Issue #11826 has been updated by Shugo Maeda.

Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN to 2.0.0: REQUIRED, 2.1: REQUIRED, 2.2: REQUIRED

Shugo Maeda wrote:
> It seems that redefinition check of optimized methods doesn't work properly for prepended classes.
> Is the following patch correct, ko1?

Committed it with a test in r53173 after checking that `make exam` succeeded.
Revert it if it's wrong.


----------------------------------------
Bug #11826: After prepending a module, rewrite Hash#[] takes no effect for calls like Hash.new[:a]
https://bugs.ruby-lang.org/issues/11826#change-55635

* Author: cichol tsai
* Status: Closed
* Priority: Normal
* Assignee: Koichi Sasada
* ruby -v: ruby 2.2.2p95 (2015-04-13 revision 50295) [x64-mingw32]
* Backport: 2.0.0: REQUIRED, 2.1: REQUIRED, 2.2: REQUIRED
----------------------------------------
~~~
module M
  def self.prepended(clz)
    clz.class_eval do
      def [](k)
        p 1
      end
    end
  end
end

module N
  def self.included(clz)
    clz.class_eval do 
      def []=(k, v)
        p 2
      end
    end
  end
end

class Hash
  prepend M
  include N
end

Hash.new[1]
Hash.new[1]=1
~~~

Running this example gives no output, which is expected to be '1 2'.
I am using 'ruby 2.2.2p95 (2015-04-13 revision 50295) [x64-mingw32]'.
Thanks in advanced.



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