Issue #12832 has been updated by Tomoyuki Chikanaga.

Backport changed from 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN to 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED

----------------------------------------
Bug #12832: Calling Object#method hangs for private method defined on module then made public once it's been used to extend class
https://bugs.ruby-lang.org/issues/12832#change-60867

* Author: James Mead
* Status: Assigned
* Priority: Normal
* Assignee: Koichi Sasada
* ruby -v: ruby 2.1.3p242 (2014-09-19 revision 47630) [x86_64-darwin14.0] onwards
* Backport: 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED
----------------------------------------
~~~ ruby
module Foo
  private

  def foo
    "foo"
  end
end

class Bar
  extend Foo

  class << self
    public :foo
  end
end

Bar.foo # => "foo"
Bar.method(:foo) # => #<Method: Class(Bar)#foo>

module Baz
end

class Bar
  class << self
    prepend Baz
  end
end

Bar.method(:foo) # => hangs!
~~~

## Runs OK

* ruby 2.0.0p648 (2015-12-16 revision 53162) [x86_64-darwin14.5.0]
* ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-darwin14.0]
* ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-darwin14.0]
* ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin14.0]

## Hangs on last line

* ruby 2.1.3p242 (2014-09-19 revision 47630) [x86_64-darwin14.0]
* ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-darwin14.0]
* ruby 2.1.10p492 (2016-04-01 revision 54464) [x86_64-darwin14.0]
* ruby 2.2.5p319 (2016-04-26 revision 54774) [x86_64-darwin14]
* ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin14]
* ruby 2.4.0preview2 (2016-09-09 trunk 56129) [x86_64-darwin14]




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