cannot see a constant defined in the grandparent module if the parent class is singleton class

[tsahara]

I'm not sure Ruby's scoping rule allows it but it is not compatible with CRuby.

module A
  CONST = 123
  class << self
    p 1, CONST
    class B
      p 2, CONST
    end
  end
end

% ruby -v a.rb
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin16]
1
123
2
123

% bin/mruby a.rb
1
123
trace:
	[0] a.rb:6
	[1] a.rb:5
	[2] a.rb:3
	[3] a.rb:1
a.rb:6: uninitialized constant #<Class:0x7fd92a802ce0>::B::CONST (NameError)

[ghost]

Right. I guess the main-ruby behaviour may be the correct one.

(Note that the code that you showed, does not output what you added lateron, e. g. there is no 1 and no 2 output on a single line.)

[tsahara]

I updated the issue comment. Thank you.