Bug #9393: Strange behavior of DelegateClass + loop + method_missing

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: 2.1.0-p0
• Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN

[fxposter (Pavel Forkert)]

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.

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)
• Status changed from Open to Closed

Correct behavior.
loop is also delegated to the target object now.

[usa (Usaku NAKAMURA)]

• Status changed from Closed to Rejected