From: Pavel@..., Forkert@...
Date: 2014-01-10T22:28:19+00:00
Subject: [ruby-core:59688] [ruby-trunk - Bug #9393] (Open) Strange behavior of DelegateClass + loop + method_missing

Issue #9393 has been reported by Pavel Forkert.

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Bug #9393: Strange behavior of DelegateClass + loop + method_missing
https://bugs.ruby-lang.org/issues/9393

* Author: Pavel Forkert
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: 2.1.0-p0
* Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN
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Having the following class in Ruby 2.1:

require 'delegate'

class A < DelegateClass(Hash)
  def a
    loop do
      ::Kernel.p 'A'
      break
    end
  end
end

After calling `A.new({}).a` the output is "A".

However if method_missing is added to the class:

class A < DelegateClass(Hash)
  def a
    loop do
      ::Kernel.p 'A'
      break
    end
  end

  def method_missing(method, *args, &block)
    ::Kernel.p method
  end
end

Then after calling A.new({}).a, the output is somewhat unexpected: :loop. That actually means that :loop method cannot be found and the block within the loop will not run. Is that the right behavior?

Ruby 2.0 returns "A" in both cases.




-- 
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